EMC Programmable IC Chips Compliant Slew Rate Limited EI , Timer IC
Chip
ADM483EAEZ EMC Compliant Slew Rate Limited EIA RS-485 Transceiver
FEATURES
Robust RS-485 Transceiver
15 kV ESD Protection Using HBM
2 kV EFT Protection Meets IEC1000-4-4 High
EM Immunity Meets IEC1000-4-3
Reduced Slew Rate for Low EM Interference 250 kbps Data Rate
Single +5 V 6 10% Supply
–7 V to +12 V Bus Common-Mode Range 12 kV Input Impedance
Short Circuit Protection Excellent Noise Immunity 36 mA Supply
Current 0.1 mA Shutdown Current
APPLICATIONS
Low Power RS-485 Systems Electrically Harsh Environments EMI
Sensitive Applications DTE-DCE Interface Packet Switching Local
Area Networks
GENERAL DESCRIPTION
The ADM483E is a robust, low power differential line transceiver
suitable for communication on multipoint bus transmission lines.
Internal protection against electrostatic discharge (ESD),
electrical fast transient (EFT) and electromagnetic immunity (EMI)
allows operation in electrically harsh environments. ESD protection
on the I-O lines meets ± 15 kV when tested using the Human Body
Model. EFT protection meets ±2 kV in accordance with IEC1000-4-4,
while EMI immunity is in excess of 10 V/m meeting IEC1000-4-3. The
level of unwanted emissions is also carefully controlled using slew
limiting on the driver outputs. This reduces reflections with
improperly terminated cables and also minimizes electromagnetic
interference. The controlled slew rate limits the data rate to 250
kbps. The ADM483E is intended for balanced data transmission and
complies with both EIA Standards RS-485 and RS-422. It contains a
differential line driver and a differential line receiver and is
suitable for half duplex data transmission, as the driver and
receiver share the same differential pins. The input impedance on
the ADM483E is 12 kΩ, allowing up to 32 transceivers on the bus.
The ADM483E operates from a single +5 V ± 10% power supply.
Excessive power dissipation caused by bus contention or by output
shorting is prevented by a thermal shutdown circuit. This feature
forces the driver output into a high impedance state if, during
fault conditions, a significant temperature increase is detected in
the internal driver circuitry. The receiver contains a fail-safe
feature that results in a logic high output state if the inputs are
unconnected (floating). The ADM483E is fabricated on BiCMOS, an
advanced mixed technology process combining low power CMOS with
robust bipolar technology. It is fully specified over the
industrial temperature range and is available in 8-lead DIP and
SOIC packages.
ABSOLUTE MAXIMUM RATINGS* (TA = +25°C unless otherwise noted)
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . .+7 V
Inputs Driver Input (DI) . . . . . . . . . . . . . . . . –0.5 V to
VCC + 0.5 V
Control Inputs (DE, RE) . . . . . . . . . . –0.5 V to VCC + 0.5 V
Receiver Inputs (A, B) . . . . . . . . . . . . . . . . . –14 V to
+14 V
Outputs Driver Outputs . . . . . . . . . . . . . . . . . . . .
–12.5 V to +12.5 V
Receiver Output . . . . . . . . . . . . . . . . . –0.5 V to VCC
+0.5 V
ESD Rating: Air (Human Body Model) (A, B Pins) . . ±15 kV
ESD Rating: Contact (Human Body Model) (A, B Pins) . . . . . . . .
. . . . . . . . . . . . . . ±8 kV
ESD Rating MIL-STD-883B Method 3015 (Except A, B) . . . . . . . . .
. . . . . . . . . ±3.5 kV
EFT Rating (IEC1000-4-4) (A, B Pins) . . . . . . . . . . . . ±2 kV
EMI Immunity (IEC1000-4-3) . . . . . . . . . . . . . . . . . . 10
V/m
Power Dissipation 8-Pin DIP . . . . . . . . . . . . . . . . . . .
727 mW θJA,
Thermal Impedance . . . . . . . . . . . . . . . . . . +135°C/W
Power Dissipation 8-Pin SOIC . . . . . . . . . . . . . . . . . 470
mW θJA,
Thermal Impedance . . . . . . . . . . . . . . . . . . +110°C/W
Operating Temperature Range Industrial (A Version) . . . . . . . .
. . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . +300°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . .
. +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . .
. . . +220°C
