ISL32611E

±16.5kV IEC ESD , 1.8V, Micro Power, RS-485/RS-422 Differential Receiver with active low Rx enable

Product Status: Mass Production

OVERVIEW

The ISL32610E, ISL32611E, ISL32612E are ±16.5kV IEC61000 ESD protected, fractional unit load (UL), 1.8V powered, single differential receivers (Rx) for balanced data communication using the RS-485 and RS-422 standards. With their 85µA supply currents, the receivers are optimized for low power applications, and deliver the lowest supply currents of any available single Rx IC.

To improve performance in low data rate applications with slow signal transitions, these Rx feature symmetrical switching points (±200mV) and increased hysteresis. The symmetrical switching points eliminate the duty cycle distortion introduced by “full-failsafe” type receivers, while the larger hysteresis increases noise immunity.

The receivers present a 1/8 unit load to the data bus, which allows up to 256 devices on the network for large node count systems (for example, process automation, remote meter reading systems). The ISL32611E/ISL32612E Rx output is tri-statable via the RE/RE input.

The receiver inputs feature a “failsafe-if-open” design, which ensures a logic high Rx output if Rx inputs are floating. Data rates up to 256kbps are achievable with this device at VCC = 1.8V.

For a companion 1.8V differential transmitter in a SOT-23 package, reference the ISL32613E datasheet.

KEY FEATURES

    • Wide Supply Voltage Range: 1.8V to 3.6V
    • Ultra Low Quiescent Supply Current: 110µA (maximum)
    • IEC61000 ESD Protection on RS-485 Bus Pins: ±16.5kV
      • Class 3 ESD Level on all Other Pins: >8kV HBM
    • Symmetrical Switching Thresholds for Less Duty Cycle Distortion
    • Larger Hysteresis for Improved Noise Immunity: 70mV
    • Data Rates up to 256kbps (1.8V) or 500kbps (3.3V)
    • 1/8 Unit Load Allows up to 256 Devices on the RS-485 Bus
    • Specified for +125°C Operation
    • Three-State Rx Output Available
    • 5V tolerant logic inputs
    • Pb-Free (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL32611E
Basic Information
Production Status
Mass Production
Key Feature
Low Power
# of Rx
1
Devices Allowed on Bus
256
Half/Full Duplex
N/A
High ESD Protection
Yes-IEC61000
Hot Plug
No
Data Rate
0.256 Mbps
Supply Voltage Vcc (Min) (V)
1.8
Supply Voltage Vcc (Max) (V)
3.6
Slew Rate Limited
N/A
Tx/Rx Enable
Yes - Active Low
IS Enabled/Disabled
85 µA
SHDN ICC
.002 µA
VL Pin
No
Qualification Level
Standard
Supply Voltage Vcc Range (V)
1.8 to 3.6
Can Sample
YES
Temperature Range
-40 to +125

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