ISL8485

5V, Half Duplex, Low Power, High Speed, RS-485/RS-422 Transceivers

OVERVIEW

The ISL8485, ISL8490, and ISL8491 RS-485 / RS-422 devices are BiCMOS 5V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. Unlike competitive devices, this family is specified for 10% tolerance supplies (4.5V to 5.5V).

The ISL8485, ISL8490, and ISL8491 feature data rates up to 5Mbps.

All devices present a single unit load to the RS-485 bus, which allows up to 32 transceivers on the network.

The receiver (Rx) inputs feature a “fail-safe if open” design, which ensures a logic high Rx output if the Rx inputs are floating.

The 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.

The ISL8490 and ISL8491 are configured for full duplex (separate Rx input and Tx output pins) applications. Half duplex configurations (ISL8485) multiplex the Rx inputs and Tx outputs to allow transceivers with Rx and Tx disable functions in 8 Ld packages.

KEY FEATURES

    • Specified for 10% tolerance supplies
    • Class 3 ESD protection (HBM) on all pins: 7kV
    • High data rates: up to 5Mbps
    • Single unit load allows up to 32 devices on the bus
    • Low quiescent current: 500µA
    • -7V to +12V common-mode input voltage range
    • Three state Rx and Tx outputs (except ISL8490)
    • 30ns propagation delays, 5ns skew
    • Full duplex and half duplex pinouts
    • Operation from a single +5V supply (10% tolerance)
    • Current limiting and thermal shutdown for driver overload protection
    • Pb-free plus anneal (RoHS compliant)

PARAMETRICS

Parameters
ISL8485
Basic Information
生产状态
Mass Production(*)
关键特性
Low Cost
Tx数量
1
Rx数量
1
总线上允许的设备
32
半/全双工
Half
高ESD保护
No
热插拔
No
数据率
5 Mbps
供电电压Vcc (最小值) (V)
4.5
供电电压Vcc (最大值) (V)
5.5
受限压摆率
No
Tx/Rx启用
Yes
IS启用/禁用
550/340 µA
SHDN ICC
N/A µA
VL引脚
No
资质级别
Standard
供电电压Vcc范围 (V)
4.5 to 5.5
CAN 采样
YES
温度范围
-40 to +85

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