ISL4485E

5V, Half Duplex, 20Mbps, ±15kV ESD Protected, RS-485/RS-422 Transceiver

OVERVIEW

The Intersil ISL4485E is a high speed, BiCMOS 5V powered, single transceiver that meets 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 device is specified for 10% tolerance supplies (4.5V to 5.5V).

The excellent differential output voltage coupled with high drive-current output stages allow 20Mbps operation over twisted pair networks up to 450 feet in length. The 25kΩ receiver input resistance presents a "single unit load" to the RS-485 bus, allowing 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.

The half duplex configuration multiplexes the Rx inputs and Tx outputs to allow transceivers with Rx and Tx disable functions in 8 lead packages.

KEY FEATURES

  • Pb-Free Available (RoHS Compliant)
  • High Data Rates up to 20Mbps
  • RS-485 I/O Pin ESD Protection ±15kV HBM
  • Class 3 ESD Level on all Other Pins >7kV HBM
  • Operates from a Single +5V Supply (10% Tolerance)
  • 1 Unit Load Allows up to 32 Devices on the Bus
  • Low Quiescent Current 700µA
  • -7V to +12V Common Mode Input Voltage Range
  • Three State Rx and Tx Outputs
  • 30ns Propagation Delays, 2ns Skew
  • Current Limiting and Thermal Shutdown for driver Overload Protection

PARAMETRICS

Parameters
ISL4485E
Basic Information
Production Status
量産中
主な特長
High Speed
Tx数
1
Rx数
1
バス上の許容デバイス数
32
半二重/全二重
Half
高ESD保護
Yes
ホットプラグ
No
データレート
20 Mbps
電源電圧Vcc (V) (min)
4.5
電源電圧Vcc (V) (max)
5.5
スルーレート制限
No
Tx/Rxイネーブル
Yes
IS イネーブル/ディセーブル
550/340 µA
SHDN ICC
N/A µA
VLピン
No
認定レベル
Standard
電源電圧Vcc範囲 (V)
4.5 to 5.5
CANサンプル
YES
温度範囲
-40 to +85

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