ISL83075E

±15kV HBM ESD Protected, 3.3V, Half-duplex, 500kbps RS-485/RS-422 Transceiver with Tx/Rx enable

OVERVIEW

The Intersil ISL8307XE are BiCMOS 3.3V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. These devices have very low bus currents (+125mA/-100mA), so they present a true “1/8 unit load” to the RS-485 bus. This allows up to 256 transceivers on the network without violating the RS-485 specification’s 32 unit load maximum, and without using repeaters. For example, in a remote utility meter reading system, individual meter readings are routed to a concentrator via an RS-485 network, so the high allowed node count minimizes the number of repeaters required.

Receiver (Rx) inputs feature a “Full Fail-Safe” design, which ensures a logic high Rx output if Rx inputs are floating, shorted, or terminated but undriven.

Hot Plug circuitry ensures that the Tx and Rx outputs remain in a high impedance state while the power supply stabilizes.

The ISL83070E through ISL83075E utilize slew rate limited drivers which reduce EMI, and minimize reflections from improperly terminated transmission lines, or unterminated stubs in multidrop and multipoint applications. Slew rate limited versions also include receiver input filtering to enhance noise immunity in the presence of slow input signals.

The ISL83070E, ISL83071E, ISL83073E, ISL83076E, ISL83077E are configured for full duplex (separate Rx input and Tx output pins) applications. The half duplex versions multiplex the Rx inputs and Tx outputs to allow transceivers with output disable functions in 8 lead packages.

KEY FEATURES

  • Pb-Free (RoHS Compliant)
  • RS-485 I/O Pin ESD Protection: ±15kV HBM
  • Class 3 ESD Level on all Other Pins: >7kV HBM
  • Full Fail-safe (Open, Short, Terminated/Floating) Receivers
  • Hot Plug - Tx and Rx Outputs Remain Three-state During Power-up (Only Versions with Output Enable Pins)
  • True 1/8 Unit Load Allows up to 256 Devices on the Bus
  • Single 3.3V Supply
  • High Data Rates: up to 20Mbps
  • Low Quiescent Supply Current: 800μA (Max)
  • Ultra Low Shutdown Supply Current: 10nA
  • -7V to +12V Common Mode Input/Output Voltage Range
  • Half and Full Duplex Pinouts
  • Three State Rx and Tx Outputs Available
  • Current Limiting and Thermal Shutdown for driver Overload Protection
  • Tiny MSOP package offering saves 50% board space

PARAMETRICS

Parameters
ISL83075E
Basic Information
Production Status
Mass Production
Key Feature
Low Cost
# of Tx
1
# of Rx
1
Devices Allowed on Bus
256
Half/Full Duplex
Half
High ESD Protection
Yes
Hot Plug
Yes
Data Rate
0.5 Mbps
Supply Voltage Vcc (Min) (V)
3
Supply Voltage Vcc (Max) (V)
3.6
Slew Rate Limited
Yes
Tx/Rx Enable
Yes
IS Enabled/Disabled
510/480 µA
SHDN ICC
0.01 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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