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Features

■ Exceeds Requirements of EIA-485 Standard ■ Hot Plug Circuitry - Tx and Rx Outputs Remain Three-State During Power-up/Power-down ■ Data Rate: 300 bps to 250 kbps ■ Full Fail-safe (Open, Short, Terminated) Receivers ■ Up to 256 Nodes on a Bus (1/8 unit load) ■ Wide Supply Voltage 3V to 5.5V ■ SOIC-8 Package for Backward Compatibility ■ Bus-Pin Protection:

  • ±18 kV HBM protection
  • ±13 kV IEC61000-4-2 Contact Discharge
  • +4 kV IEC61000-4-4 Fast Transient Burst

Applications

  • E-Metering Networks
  • Industrial Automation
  • HVAC Systems
  • Process Control
  • DMX512-Networks ● Battery-Powered Applications

Pin Configuration (Top View)

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TP8485E 8-Pin SOIC/MSOP -S and -V Suffixes

Description

The TP8485E are IEC61000 ESD protected, 3V~5.5V powered transceivers that meet the RS-485 and RS-422 standards for balanced communication. Driver outputs and receiver inputs are protected against ±18kV ESD strikes without latch-up.

Transmitters in this family deliver exceptional differential output voltages (2.5V min/5Vcc), into the RS-485 required 54Ω load, for better noise immunity, or to allow up to eight 120Ω terminations in “star” topologies. These devices have very low bus currents so they present a true “1/8 unit load” to the RS-485 bus. This allows up to 256 transceivers on the network without using repeaters. Receiver (Rx) inputs feature a “Full Fail-Safe” design, which ensures a logic high Rx output if Rx inputs are floating, shorted, or on a terminated but undriven bus. Rx outputs feature high drive levels - typically 25mA @ VOL = 1V (to ease the design of optocoupled isolated interfaces).

The TP8485E is available in an SOIC-8 and MSOP-8 package, and is characterized from -40^{\circ}C to 125^{\circ}C .

3PEAK and the 3PEAK logo are registered trademarks of 3PEAK INCORPORATED. All other trademarks are the property of their respective owners.

Exceptional Tx Drives Up To 256 Loads While Still Delivering 2.5V VOD

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Differential Output Voltage (V) (RD=15\Omega ()mA) (RD=20\Omega ()mA) (RD=25 {}^{\circ}C ()mA) (RD=54\Omega ()mA) (RD=100\Omega ()mA)
0.5 0 0 0 0 0
1.3 ~87 — — — —
1.4 — ~94 — — —
2.9 — — ~30 — —
3.1 — — — ~32 —
3.5 — — — — ~38

±18K ESD Protection, Full Fail-Safe RS-485 Transceiver

Order Information

Model NameOrder NumberPackageTransport Media, QuantityMarking Information
TP8485ETP8485E-SR8-Pin SOICTape and Reel, 4,000TP8485E
TP8485ETP8485E-VR8-Pin MSOPTape and Reel, 3,000TP8485E

DRIVER PIN FUNCTIONS

INPUTENABLEOUTPUTSDESCRIPTION
DDEAB
NORMAL MODE
HHHLActively drives bus High
LHLHActively drives bus Low
XLZZDriver disabled
XOPENZZDriver disabled by default
OPENHHLActively drives bus High

RECEIVER PIN FUNCTIONS

DIFFERENTIAL INPUTENABLEOUTPUTDESCRIPTION
$V_{ID} = V_A - V_B$ /RER
NORMAL MODE
$V_{IT+} < V_{ID}$ LHReceive valid bus High
$V_{IT-} < V_{ID} < V_{IT+}$ L?Indeterminate bus state
$V_{ID} < V_{IT-}$ LLReceive valid bus Low
XHZReceiver disabled
XOPENZReceiver disabled
Open, short, idle BusL?Indeterminate bus state

±18K ESD Protection, Full Fail-Safe RS-485 Transceiver

Absolute Maximum Ratings

V_{DD} to GND....-0.3V to +7V

Input Voltages

DI, DE, RE....-0.3V to (VCC + 0.3V)

Input/Output Voltages

A/Y, B/Z, A, B, Y, Z....-15V to +15V

A/Y, B/Z, A, B, Y, Z (Transient Pulse Through 100Ω,

Note 1)....±100V

RO....-0.3V to (VCC +0.3V)

Short Circuit Duration

Y, Z....Continuous

ESD Rating...... See Specification Table

Recommended Operating Conditions Note 2

Supply Voltage....3V~5.5V

Temperature Range....-40°C to +125°C

Bus Pin Common Mode Voltage Range ....-8V to +13V

Thermal Resistance, ΘJA (Typical)

8-Pin SOIC Package ....158°C/W

Maximum Junction Temperature (Plastic Package) .....+150°C

Maximum Storage Temperature Range ....-65°C to +150°C

Note 1: Tested according to TIA/EIA-485-A, Section 4.2.6 (±100V for 15μs at a 1% duty cycle).

Note 2: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty.

±18K ESD Protection, Full Fail-Safe RS-485 Transceiver

Electrical Characteristics Test Conditions: VCC = 5V, Over operating free-air temperature range(unless otherwise noted)

PARAMETERCONDITIONSMINTYPMAXUNITS
$|V_{OD}|$ Driver differential-output voltage magnitudeRL = 60 ΩSee Figure 1B2.6V
RL = 54 Ω with VA or VB from -7 to +12 V, Vcc = 5V (RS-485)See Figure 1A2.12.5
RL = 54 Ω with VA or VB from -7 to +12 V, Vcc = 3V (RS-485)1.41.5
RL = 100 Ω(RS-422)3
$\Delta |V_{OD}|$ Change in magnitude of driver differential-output voltageRL = 54 Ω, CL=50 pF, Vcc = 5VSee Figure 1A-0.02-0.0020.03V
$V_{OC(SS)}$ Steady-stage common-mode output voltageCenter of two 27 Ω load resistorsSee Figure 1AVcc/2-0.2 $V_{CC}/2$ Vcc/2+0.2V
$\Delta V_{OC}$ Change in differential driver common-mode output voltage-0.200.2mV
$V_{OC(PP)}$ Peak-to-peak driver common-mode output voltage500
$C_{OD}$ Differential output capacitance8pF
$V_{IT+}$ Positive-going receiver differential-input voltage threshold-75-50-45mV
$V_{IT-}$ Negative-going receiver differential-input voltage threshold-185-160-145mV
$V_{HYS^{(1)}}$ Receiver differential-input voltage threshold hysteresis ( $V_{IT+} - V_{IT-}$ )100110120mV
$V_{OH}$ Receiver high-level output voltage $I_{OH} = -8 mA$ 4.6404.6504.690V
$V_{OL}$ Receiver low-level output voltage $I_{OL} = 8 mA$ 0.2400.2400.270V
$I_{I}$ Driver input, driver enable and receiver enable input current0.0070.010.012μA
$I_{OZ}$ Receiver high-impedance output currentVO = 0 V or VCC, /RE at VCC-0.0050.010.011μA
$|I_{OS}|$ Driver short-circuit output current $|I_{OS}|$ with VA or VB from -7 to +12 V7580115mA
$I_{I}$ Bus input current(driver disabled)Vcc = 4.5 to 5.5 V or Vcc = 0 V, DE at 0 VVI= 12 V475053μA
VI= -7 V-53-50-47
$I_{CC}$ Supply current(quiescent)Driver and receiver enabledDE = Vcc, /RE = GND, No LOAD640695930μA
Driver enabled, receiver disabledDE = Vcc, /RE = $V_{CC}$ , No LOAD210270280
Driver disabled, receiver enabledDE = GND, /RE = $V_{CC}$ , No LOAD440480530
Driver and receiver disabledDE = GND, /RE = $V_{CC}$ , D= $V_{CC}$ No LOAD0.71.41.5
Supply current(dynamic)See

±18K ESD Protection, Full Fail-Safe RS-485 Transceiver

Switching CHARACTERISTICS 3.3ms > bit time > 4μs(unless otherwise noted)s

PARAMETERCONDITIONSMINTYPMAXUNITS
DRIVER
tr, tfDriver differential-output rise and fall timesRL = 54 Ω, CL=50pFSee Figure 2620ns
tPHL, tPLHDriver propagation delay340
tSK(P)Driver pulse skew, |tPHL - tPLH|23
tPHZ, tPLZDriver disable timeSee Figure 3250ns
tPHZ, tPLZDriver enable timeReceiver enabled562ns
Receiver disabled562
RECEIVER
tr, tfReceiver output rise and fall timesCL=15 pFSee Figure 512.4ns
tPHL, tPLHReceiver propagation delay time960
tSK(P)Receiver pulse skew, |tPHL - tPLH|40
tPHZ, tPLZReceiver disable time7ns
tPZL(1), tPZH(1)Receiver enable timeDriver enabledSee Figure 670ns
tPZL(2), tPZH(2)Driver disabledSee Figure 6989
ESD
RS-485 Pins (A, Y, B, Z, A/Y, B/Z)IEC61000-4-2, Air-Gap Discharge Method±18kV
IEC61000-4-2, Contact Discharge Method±13kV
Human Body Model, From Bus Pins to GND±18kV
All Other PinsHuman Body Model, per MIL-STD-883±4kV

±18K ESD Protection, Full Fail-Safe RS-485 Transceiver

Test Circuits and Waveforms

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Vcc DE Z DI D Y VOD RL/2 RL/2 VOC

FIGURE 1A. VOD AND VOC

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Vcc DE Z DI D Y VOD RL=60 Ω 375 Ω 375 Ω

FIGURE 1B. VOD WITH COMMON MODE LOAD FIGURE 1. DC DRIVER TEST CIRCUITS

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Vcc DE DI D Z Y RDIFF CL=100pF CL=100pF SIGNAL GENERATOR

FIGURE 2A. TEST CIRCUIT

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DI 1.5V 1.5V 3V 0V OUT(Z) V_OH OUT(Y) V_OL DIFF OUT(Y-Z) 90% +V_OD 10% -V_OD t_PLH t_PHL t_R t_F SKEW=|t_PLH-t_PHL|

FIGURE 2B. MEASUREMENT POINTS

FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES

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DE DI SIGNAL GENERATOR Z D Y 500Ω SW VCC GND CL

PARAMETEROUTPUTREDISWCL (pF)
tHZY/ZX1/0GND15
tLZY/ZX0/1VCC15
tZHY/Z0 (Note 9)1/0GND100
tZLY/Z0 (Note 9)0/1VCC100
tZH(SHDN)Y/Z1 (Note 12)1/0GND100
tZL(SHDN)Y/Z1 (Note 12)0/1VCC100

FIGURE 3A. TEST CIRCUIT

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Signal State Voltage Level Description
DE High 1.5V Output High
DE Low 1.5V Output Low
OUT(Y,Z) High 2.3V Output High
OUT(Y,Z) Low 2.3V Output Low
VOL-0.5V High 0V Output High
VOL-0.5V Low 0V Output Low
VOL+0.5V High 0V Output High
VOL+0.5V Low 0V Output Low

FIGURE 3B. MEASUREMENT POINTS FIGURE 3. DRIVER ENABLE AND DISABLE TIMES

Test Circuits and Waveforms(continue)

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Vcc DE DI D Z Y 60 Ω CD VOD SIGNAL GENERATOR

FIGURE 4A. TEST CIRCUIT

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DI 3V 0V DIFF OUT(Y-Z) -VOD +VOD 0V

FIGURE 4B. MEASUREMENT POINTS FIGURE 4. DRIVER DATA RATE

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0V B A RE R RO 15pF SIGNAL GENERATOR

FIGURE 5A. TEST CIRCUIT

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A +1.5V 0V -1.5V tPLH tPHL RO 1.5V 1.5V VCC 0V

FIGURE 5B. MEASUREMENT POINTS FIGURE 5. RECEIVER PROPAGATION DELAY AND DATA RATE

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RE GND B A R RO 1kΩ SW Vcc GND 15pF SIGNAL GENERATOR

PARAMETERDEASW
tHZ0+1.5VGND
tLZ0-1.5VVCC
tZH(Note 10)0+1.5VGND
tZL(Note 10)0-1.5VVCC
tZH(SHDN)(Note 13)0+1.5VGND
tZL(SHDN)(Note 13)0-1.5VVCC

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Parameter Description
tZH, tZH(SHDN) Time delay between reference and output
tLZ Time delay between output and reference
VOH Output High Voltage
VOH-0.5V Output High Voltage
VOH Output Low Voltage
VOL+0.5V Output Low Voltage
VOL Output Low Voltage
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FIGURE 6A. TEST CIRCUIT FIGURE 6B. MEASUREMENT POINTS FIGURE 6. RECEIVER ENABLE AND DISABLE TIMES

±18K ESD Protection, Full Fail-Safe RS-485 Transceiver

Detailed Description

RS-485 and RS-422 are differential (balanced) data transmission standards used for long haul or noisy environments. RS-422 is a subset of RS-485, so RS-485 transceivers are also RS-422 compliant. RS-422 is a point-to-multipoint (multidrop) standard, which allows only one driver and up to 10 (assuming one unit load devices) receivers on each bus. RS-485 is a true multipoint standard, which allows up to 32 one unit load devices (any combination of drivers and receivers) on each bus. To allow for multipoint operation, the RS-485 specification requires that drivers must handle bus contention without sustaining any damage. Another important advantage of RS-485 is the extended common mode range (CMR), which specifies that the driver outputs and receiver inputs withstand signals that range from +12V to -7V. RS-422 and RS-485 are intended for runs as long as 4000', so the wide CMR is necessary to handle ground potential differences, as well as voltages induced in the cable by external fields.

Receiver (Rx) Features

TP8485E utilize a differential input receiver for maximum noise immunity and common mode rejection. Input sensitivity is better than ±200mV, as required by the RS-422 and RS-485 specifications. Rx outputs feature high drive levels (typically 25mA @ VOL = 1V) to ease the design of optically coupled isolated interfaces. Receiver input resistance of 100kΩ surpasses the RS-422 specification of 4kΩ, and is eight times the RS-485 “Unit Load (UL)” requirement of 12kΩ minimum. Thus, these products are known as “one-eighth UL” transceivers, and there can be up to 256 of these devices on a network while still complying with the RS-485 loading specification. Rx inputs function with common mode voltages as great as ±7V outside the power supplies (i.e., +12V and -7V), making them ideal for long networks where induced voltages are a realistic concern. All the receivers include a “full fail-safe” function that guarantees a high level receiver output if the receiver inputs are unconnected (floating), shorted together, or connected to a terminated bus with all the transmitters disabled. Receivers easily meet the data rates supported by the corresponding driver, and all receiver outputs are three-stable via the active low RE input.

Driver (Tx) Features

TP8485E driver is a differential output device that delivers at least 2.5V across a 54Ω load (RS-485), and at least 2.8V across a 100Ω load (RS-422). The drivers feature low propagation delay skew to maximize bit width, and to minimize EMI, and all drivers are three-stable via the active high DE input.

Full Fail-Safe

All the receivers include a “full fail-safe” function that guarantees a high level receiver output if the receiver inputs are unconnected (floating), shorted together, or connected to a terminated bus with all the transmitters disabled. Receivers easily meet the data rates supported by the corresponding driver, and all receiver outputs are three-statable via the active low RE input.

Hot Plug Function

When a piece of equipment powers up, there is a period of time where the processor or ASIC driving the RS-485 control lines (DE, RE) is unable to ensure that the RS-485 Tx and Rx outputs are kept disabled. If the equipment is connected to the bus, a driver activating prematurely during power-up may crash the bus. To avoid this scenario, the TP8485E devices incorporate a “Hot Plug” function. Circuitry monitoring VCC ensures that, during power-up and power-down, the Tx and Rx outputs remain disabled, regardless of the state of DE and RE, if VCC is less than ~2.5V. This gives the processor/ASIC a chance to stabilize and drive the RS-485 control lines to the proper states.

line
Signal Peak Value (V) Period (t)
Vcc 2.5 2.5
A/Y 3.2 3.2
Receiver output 3.2 3.2

FIGURE 8. HOT PLUG PERFORMANCE (TP8485E) vs Competitor WITHOUT HOT PLUG CIRCUITRY

ESD Protection

All pins on these devices include 4kV Human Body Model (HBM) ESD protection structures, but the RS-485 pins (driver outputs and receiver inputs) incorporate advanced structures allowing them to survive ESD events in excess of ±18kV HBM and ±13kV (1/2 duplex) IEC61000-4-2. The RS-485 pins are particularly vulnerable to ESD strikes because they typically connect to an exposed port on the exterior of the finished product. Simply touching the port pins, or connecting a cable, can cause an ESD event that might destroy unprotected ICs. These new ESD structures protect the device whether or not it is powered up, and without degrading the RS-485 common mode range of -8V to +13V. This built-in ESD protection eliminates the need for board level protection structures (e.g., transient suppression diodes), and the associated, undesirable capacitive load they present.

Transient Protection

The bus terminals of the TP8485E transceiver family possess on-chip ESD protection against ±18 kV HBM and ±13 kV IEC61000-4-2 contact discharge. The International Electrotechnical Commission (IEC) ESD test is far more severe than the HBM ESD test. The 50% higher charge capacitance, CS, and 78% lower discharge resistance, RD of the IEC model produce significantly higher discharge currents than the HBM model.

As stated in the IEC 61000-4-2 standard, contact discharge is the preferred transient protection test method. Although IEC air-gap testing is less repeatable than contact testing, air discharge protection levels are inferred from the contact discharge test results.

Figure 9. HBM and IEC-ESD Models and Currents in Comparison (HBM Values in Parenthesis)

±18K ESD Protection, Full Fail-Safe RS-485 Transceiver

The on-chip implementation of IEC ESD protection significantly increases the robustness of equipment. Common discharge events occur because of human contact with connectors and cables. Designers may choose to implement protection against longer duration transients, typically referred to as surge transients. Figure 9 suggests two circuit designs providing protection against short and long duration surge transients, in addition to ESD and Electrical Fast Transients (EFT) transients. Table 1 lists the bill of materials for the external protection devices.

EFTs are generally caused by relay-contact bounce or the interruption of inductive loads. Surge transients often result from lightning strikes (direct strike or an indirect strike which induce voltages and currents), or the switching of power systems, including load changes and short circuits switching. These transients are often encountered in industrial environments, such as factory automation and power-grid systems. Figure 10 compares the pulse-power of the EFT and surge transients with the power caused by an IEC ESD transient. In the diagram on the left of Figure 10, the tiny blue blip in the bottom left corner represents the power of a 10-kV ESD transient, which already dwarfs against the significantly higher EFT power spike, and certainly dwarfs against the 500-V surge transient. This type of transient power is well representative of factory environments in industrial and process automation. The diagram on the fright of Figure 10 compares the enormous power of a 6-kV surge transient, most likely occurring in e-metering applications of power generating and power grid systems, with the aforementioned 500-V surge transient.

Figure 10. Power Comparison of ESD, EFT, and Surge Transients

In the case of surge transients, high-energy content is signified by long pulse duration and slow decaying pulse Power The electrical energy of a transient that is dumped into the internal protection cells of the transceiver is converted into thermal energy. This thermal energy heats the protection cells and literally destroys them, thus destroying the transceiver. Figure 11 shows the large differences in transient energies for single ESD, EFT, and surge transients as well as for an EFT pulse train, commonly applied during compliance testing.

±18K ESD Protection, Full Fail-Safe RS-485 Transceiver

line
Peak Pulse Voltage (kV) Surge (Joule) EFT Pulse Train (Joule) EFT (Joule) ESD (Joule)
0.5 1 0.012 0.00004 —
1 4 0.05 0.0002 —
2 18 0.2 0.0007 0.000002
4 70 0.7 0.003 0.000008
6 160 — — 0.00002
8 — — — 0.00003
10 — — — 0.00005
15 — — — 0.0001

Figure 11. Comparison of Transient Energies

Table 1. Bill of Materials

DeviceFunctionOrder NumberManufacturer
4855-V, 250-kbps RS-485 TransceiverTP8485E3PEAK
R1, R210-Ω, Pulse-Proof Thick-Film ResistorCRCW0603010RJNEAHPVishay
TVSBidirectional 400-W Transient SuppressorCDSOT23-SM712Bourns
TBU1, TBU2BidirectionalTBU-CA-065-200-WHBourns
MOV1, MOV2200mA Transient Blocking Unit 200-V, Metal-Oxide VaristorMOV-10D201KBourns

Figure 12. Transient Protections Against ESD, EFT, and Surge Transients

The left circuit shown in Figure 12 provides surge protection of \geq 500-V transients, while the right protection circuits can withstand surge transients of 5 kV

±18K ESD Protection, Full Fail-Safe RS-485 Transceiver

Typical Performance Characteristics

line
Differential Output Voltage (V) (RD=15\Omega ()mA) (RD=20\Omega ()mA) (RD=25 {}^{\circ}C ()mA) (RD=54\Omega ()mA) (RD=100\Omega ()mA)
0.5 0 0 0 0 0
1.3 ~87 — — — —
1.4 — ~95 — — —
2.9 — — ~30 — —
3.1 — — — ~32 —
3.5 — — — — ~38

FIGURE 13. DRIVER OUTPUT CURRENT vs VOLTAGE DIFFERENTIAL OUTPUT VOLTAGE

line
Output Voltage (V) Output Current (mA)::Y or Z = LOW Output Current (mA)::Y or Z = HIGH
-7 ~0 ~-48
-6 ~0 ~-49
-5 ~0 ~-47
-4 ~0 ~-47
-3 ~0 ~-46
-2 ~0 ~-46
-1 ~0 ~-46
0 ~0 ~-46
1 ~10 ~-46
2 ~40 ~-47
3 ~93 ~-35
4 ~75 ~-20
5 ~70 ~0
6 ~68 ~3
7 ~65 ~1
8 ~63 ~1
9 ~61 ~1
10 ~59 ~1
11 ~57 ~1
12 ~54 ~1

FIGURE 15. DRIVER OUTPUT CURRENT vs SHORT CIRCUIT VOLTAGE

line
Temperature (({}^{\circ}C)) tPLH (µs) tPHL (µs)
-40 ~1.25 ~1.15
0 ~1.30 ~1.20
40 ~1.38 ~1.25
80 ~1.48 ~1.30
100 ~1.45 ~1.35
120 ~2.00 ~1.35
150 ~2.35 ~1.45

FIGURE 17. DRIVER DIFFERENTIAL PROPAGATION DELAY vs TEMPERATURE

line
Temperature (({}^{\circ}C)) Differential Output V ((RDIFF=100\Omega)) Differential Output V ((RDIFF=54\Omega))
-40 ~3.85 ~3.42
-20 ~3.80 ~3.32
0 ~3.85 ~3.40
20 ~3.83 ~3.39
40 ~3.83 ~3.39
60 ~3.85 ~3.40
80 ~3.87 ~3.41
100 ~3.85 ~3.40
120 ~3.80 ~3.35
140 ~3.65 ~3.20

FIGURE 14. DRIVER DIFFERENTIAL OUTPUT vs TEMPERATURE

line
Temperature (e) Icc (µ) (DE=Vcc, RE=X) Icc (µ) (DE=GND, RE=GND)
-40 ~580 ~325
0 ~520 ~290
50 ~470 ~260
100 ~410 ~280
125 ~390 ~360
150 ~340 —

FIGURE 16. SUPPLY CURRENT vs TEMPERATURE

line
Temperature Skew ((\mu))
-40 ~0.13
-20 ~0.13
0 ~0.14
20 ~0.15
40 ~0.13
60 ~0.16
80 ~0.20
100 ~0.13
120 ~0.65
140 ~0.88

FIGURE 18. DRIVER DIFFERENTIAL SKEW vs TEMPERATURE

Typical Performance Curves VCC = 5V, TA = +25°C; Unless Otherwise Specified.

line
Signal State
DI High
DI Low
RO High
RO Low
B/Z High
B/Z Low
A/Y High
A/Y Low

FIGURE 19. DRIVER AND RECEIVER WAVEFORMS

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Time (500ns/DIV) Voltage (A) (V) Voltage (B) (V)
0 ~100 ~-100
500 ~100 ~-100
1000 ~100 ~-100
1500 ~100 ~-100
2000 ~100 ~-100
2500 ~100 ~-100
3000 ~100 ~-100
3500 ~100 ~-100
4000 ~100 ~-100
4500 ~100 ~-100
5000 ~100 ~-100
5500 ~100 ~-100
6000 ~100 ~-100
6500 ~100 ~-100
7000 ~100 ~-100
7500 ~100 ~-100
8000 ~100 ~-100
8500 ~100 ~-100
9000 ~100 ~-100
9500 ~100 ~-100
10000 ~100 ~-100
10500 ~100 ~-100
11000 ~100 ~-100
11500 ~100 ~-100
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12500 ~100 ~-100
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20000 ~100 ~-100
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21500 ~100 ~-100
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22500 ~100 ~-100
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66500 ~100 ~-100
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68500 ~100 ~-100
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69500 ~100 ~-100
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70500 ~100 ~-100
71000 ~100 ~-100
71500 ~100 ~-100
72000 ~100 ~-100
72500 ~100 ~-100
73000 ~100 ~-100
73500 ~100 ~-100
74000 ~100 ~-100
74500 ~100 ~-100
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75500 ~100 ~-100
76000 ~100 ~-100
76500 ~100 ~-100
77000 ~100 ~-100
77500 ~100 ~-100
78000 ~100 ~-100
78500 ~100 ~-100
79000 ~100 ~-100
79500 ~100 ~-100
80000 ~100 ~-100
80500 ~100 ~-100
81000 ~100 ~-100
81500 ~100 ~-100
82000 ~100 ~-100
82500 ~100 ~-100
83000 ~100 ~-100
83500 ~100 ~-100
84000 ~100 ~-100
84500 ~100 ~-100
85000 ~100 ~-100
85500 ~100 ~-100
86000 ~100 ~-100
86500 ~100 ~-100
87000 ~100 ~-100
87500 ~100 ~-100
88000 ~100 ~-100
88500 ~100 ~-100
89000 ~100 ~-100
89500 ~100 ~-100
90000 ~100 ~-100
90500 ~100 ~-100
91000 ~100 ~-100
91500 ~100 ~-100
92000 ~100 ~-100
92500 ~100 ~-100
93000 ~100 ~-100
93500 ~100 ~-100
94000 ~100 ~-100
94500 ~100 ~-100
95000 ~100 ~-100
95500 ~100 ~-100
96000 ~100 ~-100
96500 ~100 ~-100
97000 ~100 ~-100
97500 ~100 ~-100
98000 ~100 ~-100
98500 ~100 ~-100
99000 ~100 ~-100
99500 ~100 ~-100
100000 ~100 ~-100

FIGURE 20. DRIVER WAVEFORMS

±18K ESD Protection, Full Fail-Safe RS-485 Transceiver

Package Outline Dimensions

SO-8 (SOIC-8)

text_image

θ C L1 E

SymbolDimensionsIn MillimetersDimensions InInches
MinMaxMinMax
A10.1000.2500.0040.010
A21.3501.5500.0530.061
b0.3300.5100.0130.020
C0.1900.2500.0070.010
D4.7805.0000.1880.197
E3.8004.0000.1500.157
E15.8006.3000.2280.248
e1.270 TYP0.050 TYP
L10.4001.2700.0160.050
θ0°8°0°8°

Package Outline Dimensions

MSOP-8

SymbolDimensionsIn MillimetersDimensions InInches
MinMaxMinMax
A0.8001.2000.0310.047
A10.0000.2000.0000.008
A20.7600.9700.0300.038
b0.30 TYP0.012 TYP
C0.15 TYP0.006 TYP
D2.9003.1000.1140.122
e0.65 TYP0.026
E2.9003.1000.1140.122
E14.7005.1000.1850.201
L10.4100.6500.0160.026
θ0°6°0°6°
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