ISL8485E

Features:

RS-485 I/O Pin ESD Protection . . . . . . . . . . . . . ±15kV HBM
- Class 3 ESD Level on all Other Pins . . . . . .....>7kV HBM
Specified for 10% Tolerance Supplies
High Data Rate Version (ISL8485E) . . . . . . up to 5Mbps
Slew Rate Limited Version for Error Free Data
Transmission (ISL8483E) . . . . . . . . . . . . . .up to 250kbps
Single Unit Load Allows up to 32 Devices on the Bus
1nA Low Current Shutdown Mode (ISL8483E)
Low Quiescent Current:
-160A (ISL8483E)
-340A (ISL8485E)
-7V to +12V Common Mode Input Voltage Range
Three State Rx and Tx Outputs
30ns Propagation Delays, 5ns Skew (ISL8485E)
Operate from a Single +5V Supply (10% Tolerance)
Current Limiting and Thermal Shutdown for driver Overload Protection




Application

Factory Automation
Security Networks
Building Environmental Control Systems
Industrial/Process Control Networks
Level Translators (e.g., RS-232 to RS-422)
RS-232 "Extension Cords"




Pinout






Specifications

V_CC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
DI, DE, RE . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (V_CC +0.5V)
Input / Output Voltages
A/Y, B/Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8V to +12.5V
RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (V_CC +0.5V)
Short Circuit Duration
Y, Z. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . .See Specification Table




Description

These Intersil RS-485, RS-422 devices are ESD protected, BiCMOS 5V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. Each driver output/receiver input is protected against 15kV ESD strikes, without latch-up. Unlike competitive devices, this Intersil family is specified for 10% tolerance supplies (4.5V to 5.5V). The ISL8483E utilizes slew rate limited drivers which reduce EMI, and minimize reflections from improperly terminated transmission lines, or un-terminated stubs in multidrop and multi-point applications. Data rates up to 10Mbps are achievable by using the ISL8485E which features higher slew rates. Both devices present a single unit load to the RS-485 bus, which allows up to 32 transceivers on the network. Receiver (Rx) inputs feature a fail-safe if open design, which ensures a logic high Rx output, if Rx inputs are floating. 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. These half duplex configurations multiplex the Rx inputs and Tx outputs to allow transceivers with Rx and Tx disable functions in 8 lead packages.