ISL43485

3.3V, Half Duplex, 30Mbps, RS-485/RS-422 Transceiver

Product Status: Mass Production

OVERVIEW

The Intersil ISL43485 is a high speed BiCMOS 3.3V powered, single transceiver that meets both the RS-485 and RS-422 standards for balanced communication. Unlike some competitive devices, this Intersil transceiver is specified for 10% tolerance supplies (3V to 3.6V).

Data rates up to 30Mbps are achievable by using this transceiver, which features higher slew rates.

Logic inputs (e.g., DI and DE) accept signals in excess of 5.5V, making them compatible with 5V logic families.

Receiver (Rx) inputs feature a "fail-safe if open" design, which ensures a logic high output if Rx inputs are floating, and the ISL43485 presents a "single unit load" to the RS-485 bus, which allows up to 32 transceivers on the network.

Driver (Tx) outputs are short circuit protected, even for voltages exceeding the power supply voltage. Additionally, on-chip thermal shutdown circuitry disables the Tx outputs to prevent damage if power dissipation becomes excessive.

KEY FEATURES

  • High Data Rate up to 30Mbps
  • Operates from a Single +3.3V Supply (10% Tolerance)
  • Interoperable with 5V Logic
  • Single Unit Load Allows up to 32 Devices on the Bus
  • Low Current Shutdown Mode 15nA
  • -7V to +12V Common Mode Input Voltage Range
  • Three State Rx and Tx Outputs
  • 10ns Propagation Delay, 1ns Skew
  • Half Duplex Pinout
  • Current Limiting and Thermal Shutdown for driver Overload Protection
  • Pb-Free Available (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL43485
Basic Information
Production Status
Mass Production
Key Feature
High Speed
# of Tx
1
# of Rx
1
Devices Allowed on Bus
32
Half/Full Duplex
Half
High ESD Protection
No
Hot Plug
No
Data Rate
30 Mbps
Supply Voltage Vcc (Min) (V)
3
Supply Voltage Vcc (Max) (V)
3.6
Slew Rate Limited
No
Tx/Rx Enable
Yes
IS Enabled/Disabled
750/650 µA
SHDN ICC
0.015 µA
VL Pin
No
Qualification Level
Standard
Supply Voltage Vcc Range (V)
3.0 to 3.6
Can Sample
YES
Temperature Range
-40 to +85

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