Datasheet

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±15 kV ESD Protected, Slew Rate

Limited, 5 V, RS-485 Transceiver

ADM483E

Rev. A

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FEATURES

±15 kV ESD protection

250 kbps data rate

Reduced slew rate for low EM interference

Single 5 V ± 10% supply

−7 V to +12 V bus common-mode range

Up to 32 nodes on the bus

Receiver open-circuit, fail-safe design

Short-circuit protection

36 μA supply current

0.1 μA shutdown current

APPLICATIONS

Low power RS-485 systems

Electrically harsh environments

EMI sensitive applications

DTE-DCE interface

Packet switching

Local area networks

FUNCTIONAL BLOCK DIAGRAM

ADM483E

6012-001

Figure 1.

GENERAL DESCRIPTION

The ADM483E is a 5 V, low power data transceiver with ±15 kV

ESD protection suitable for half-duplex communication on

multipoint bus transmission lines. The ADM483E is designed

for balanced data transmission and complies with TIA/EIA

Standards RS-485 and RS-422, which allow up to 32 transceivers

on a bus.

The ADM483E has a low current shutdown mode in which it

consumes only 0.1 μA.

Because only one driver is enabled at any time, the output of a

disabled or power-down driver is three-stated to avoid

overloading the bus.

Drivers are short-circuit current-limited and are protected

against excessive power dissipation by thermal shutdown

circuitry that places their outputs into a high impedance state.

The receiver input has a fail-safe feature that guarantees a logic

high output if the input is open circuit.

The ADM483E is fully specified over the industrial temperature

ranges and is available in 8-lead SOIC_N packages.

Summary of content (16 pages)

PAGE 1
±15 kV ESD Protected, Slew Rate Limited, 5 V, RS-485 Transceiver ADM483E ±15 kV ESD protection 250 kbps data rate Reduced slew rate for low EM interference Single 5 V ± 10% supply −7 V to +12 V bus common-mode range Up to 32 nodes on the bus Receiver open-circuit, fail-safe design Short-circuit protection 36 μA supply current 0.1 μA shutdown current FUNCTIONAL BLOCK DIAGRAM ADM483E RO R B RE DE DI A D 06012-001 FEATURES Figure 1.
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ADM483E TABLE OF CONTENTS Features .............................................................................................. 1 Test Circuits and Switching Characteristics...................................9 Applications....................................................................................... 1 General Information ...................................................................... 11 Functional Block Diagram ..............................................................
PAGE 3
ADM483E SPECIFICATIONS VCC = 5 V ± 10%. All specifications TMIN to TMAX, unless otherwise noted. Table 1. Parameter DRIVER Differential Output Voltage, VOD Min Typ 2.0 1.5 1.
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ADM483E TIMING SPECIFICATIONS VCC = 5 V ± 10%. All specifications TMIN to TMAX, unless otherwise noted. Table 2.
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ADM483E ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. Table 3. Parameter VCC to GND Digital I/O Voltage (DE, RE) Driver Input Voltage (DI) Receiver Output Voltage (RO) Driver Output/Receiver Input Voltage (Pin A, Pin B) ESD Rating: Air (Human Body Model) (Pin A, Pin B) Power Dissipation 8-Lead SOIC_N θJA, Thermal Impedance Operating Temperature Range Industrial (A Version) Storage Temperature Range Lead Temperature (Soldering, 10 sec) Vapor Phase (60 sec) Infrared (15 sec) Rating −0.
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ADM483E RO 1 RE 2 ADM483E DE 3 TOP VIEW DI 4 (Not to Scale) 8 VCC 7 B 6 A 5 GND 06012-002 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Figure 2. Pin Configuration Table 4. Pin Function Descriptions Pin No. 1 2 Mnemonic RO RE 3 DE 4 DI 5 6 7 8 GND A B VCC Description Receiver Output. When enabled, if A > B by 200 mV, then RO = high. If A < B by 200 mV, then RO = low. Receiver Output Enable. A low level enables the receiver output, RO.
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ADM483E TYPICAL PERFORMANCE CHARACTERISTICS 50 0.9 45 0.8 OUTPUT LOW VOLTAGE (V) 35 30 25 20 15 10 0.6 0.5 0.4 0.3 0.2 0.1 5 0 0.5 1.0 1.5 2.0 2.5 OUTPUT LOW VOLTAGE (V) 0 –40 06012-003 0 0.7 –20 0 20 40 60 80 TEMPERATURE (°C) Figure 3. Output Current vs. Receiver Output Low Voltage 06012-006 OUTPUT CURRENT (mA) 40 Figure 6. Receiver Output Low Voltage vs. Temperature 45 –30 40 –25 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 35 –20 –15 –10 30 25 20 15 10 –5 2.0 2.5 3.
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ADM483E 10 140 9 120 SHUTDOWN CURRENT (µA) 80 60 40 7 6 5 4 3 2 20 1 0 2 4 6 8 10 12 OUTPUT LOW VOLTAGE (V) 0 –60 06012-009 0 –40 –20 0 20 40 60 80 100 TEMPERATURE (°C) Figure 9. Output Current vs. Driver Output Low Voltage Figure 12. Shutdown Current vs. Temperature –140 OUTPUT CURRENT (mA) –120 –100 –80 A B 2 –60 –40 RO –20 –4 –2 0 2 4 6 OUTPUT HIGH VOLTAGE (V) CH1 5.00V CH2 500mV CH3 500mV Figure 10. Output Current vs. Driver Output High Voltage M200ns T 57.
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ADM483E TEST CIRCUITS AND SWITCHING CHARACTERISTICS Y VCC RL = 500Ω S1 RL 0V OR 5V D OUT CL VOD VOC GENERATOR 06012-015 RL Z 50Ω Figure 15. Driver DC Test Load 5V DE 5V VCC/2 0V tDZL, tDZL(SHDN) CL 2.3V OUT RL 0.5V VOL B Figure 19. Driver Enable and Disable Times (tDZL, tDLZ, tDZL(SHDN)) 06012-016 CL VID ATE 5V DI tDPLH tDPHL 1/2 VO Figure 20. Receiver Propagation Delay Test Circuit B A +1V A VO B tRPLH 1/2VO VDIFF = V (A) – V (B) 90% RO 90% 10% tDR 1.
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ADM483E S1 S3 –1.5V 0V OR 5V GENERATOR VCC 1kΩ VID CL 15pF S2 50Ω S1 CLOSED S2 OPEN S3 = –1.5V S1 OPEN S2 CLOSED S3 = +1.5V +5V +5V RE RE 0V tRZH, tRZH(SHDN) tRZL, tRZL(SHDN) +1.5V RO 0V VOL S1 OPEN S2 CLOSED S3 = +1.5V S1 CLOSED S2 OPEN S3 = +1.5V +5V RE +5V RE +1.5V 0V RO +1.5V tRLZ tRHZ +0.5V 0V VCC VOH +1.5V RO +1.5V 0V VCC VOH RO 0V +0.5V Figure 22. Receiver Enable and Disable Times Rev. A | Page 10 of 16 VOL 06012-022 +1.
PAGE 11
ADM483E GENERAL INFORMATION +5V +5V The ADM483E is a robust RS-485 transceiver that operates from a single 5 V supply. 0.1µF It is ideally suited for operation in electrically harsh environments or where cables may be plugged and unplugged. It is also immune to high RF field strengths without special shielding precautions. The ADM483E is intended for balanced data transmission and complies with both EIA Standards RS-485 and RS-422.
PAGE 12
ADM483E Although very little energy is contained within an ESD pulse, the extremely fast rise time, coupled with high voltages, can cause failures in unprotected semiconductors. Catastrophic destruction may occur immediately as a result of arcing or heating. Even if catastrophic failure does not occur immediately, the device may suffer from parametric degradation, which can result in degraded performance. The cumulative effects of continuous exposure may eventually lead to complete failure.
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ADM483E APPLICATIONS INFORMATION DIFFERENTIAL DATA TRANSMISSION CABLE AND DATA RATE Differential data transmission is used to reliably transmit data at high rates over long distances and through noisy environments. Differential transmission nullifies the effects of ground shifts and noise signals that appear as common-mode voltages on the line.
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ADM483E OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 8 1 5 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE 6.20 (0.2441) 5.80 (0.2284) 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) 0.50 (0.0196) 0.25 (0.0099) 45° 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.
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ADM483E NOTES Rev.