ISL8487E

5V, Half Duplex, 250kbps Slew Rate Limited, ±15kV ESD, 1/8 Unit Load, RS-485/RS-422 Transceiver

Product Status: 量産中(*)

OVERVIEW

The ISL8487E, ISL81487L, and ISL81487E RS-485/RS-422 devices are ESD protected, fractional unit load (UL), 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 device family is specified for 10% tolerance supplies (4.5V to 5.5V).

All devices present a 1/8 unit load to the RS-485 bus, which allows up to 256 transceivers on the network for large node count systems (for example, process automation and remote meter reading systems). In a remote utility meter reading system, individual utility meter readings (in apartments, for
example) are routed to a concentrator with an RS-485 network, so the high allowed node count minimizes the number of repeaters required to network all the meters. Data for all meters is then read out from the concentrator from a single access port or a wireless link.

Slew rate limited drivers on the ISL8487E and ISL81487L reduce EMI and minimize reflections from improperly terminated transmission lines or unterminated stubs in multidrop and multipoint applications. Data rates up to 250kbps are achievable with these devices.

Data rates up to 5Mbps are achievable by using the ISL81487E, which features higher slew rates.

The receiver (Rx) inputs feature a “fail-safe if open” design, which ensures a logic high Rx output if 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 half duplex devices multiplex the Rx inputs and Tx outputs to allow transceivers with Rx and Tx disable functions in 8 lead packages.

KEY FEATURES

  • RS-485 I/O pin ESD protection: ±15kV HBM
  • Class 3 ESD level on all other pins: >7kV HBM
  • Fractional unit load allows up to 256 devices on the bus
  • Specified for 10% tolerance supplies
  • High data rate version (ISL81487E): up to 5Mbps
  • Slew rate limited versions for error free data transmission (ISL8487E, ISL81487L): up to 250kbps
  • Low current shutdown mode (except ISL81487E): 0.5μA
  • Low quiescent supply current:
  • ISL8487E, ISL81487L: 145μA (maximum)
  • ISL81487E: 420μA (maximum)
  • -7V to +12V common mode input voltage range
  • Three state Rx and Tx outputs
  • 30ns propagation delays, 5ns skew (ISL81487E)
  • Half duplex pinouts
  • Operate from a single +5V supply (10% tolerance)
  • Current limiting and thermal shutdown for driver overload protection
  • Pin compatible replacements for: MAX487E, (ISL8487E); LTC1487, ADM1487 (ISL81487L); MAX1487E, ST485ER (ISL81487E)
  • Pb-free plus anneal available (RoHS compliant)

PARAMETRICS

Parameters
ISL8487E
Basic Information
Production Status
量産中(*)
主な特長
Low Cost
Tx数
1
Rx数
1
バス上の許容デバイス数
256
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
0.25 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
Yes
Tx/Rxイネーブル
Yes
IS イネーブル/ディセーブル
160/120 µA
SHDN ICC
0.5 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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