ISL32612E
±16.5kV ESD Protected, 1.8V, Micro Power, +125°C, 1/8 Unit Load, RS-485/RS-422 Differential Receivers
Key Features
- Wide Supply Voltage Range: 1.8V to 3.6V
- Ultra Low Quiescent Supply Current: 110µA (Max.)
- 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 (see Figure 2)
- 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)
Description
The ISL32610E, ISL32611E, ISL32612E are ±16.5kV IEC61000 ESD protected, fractional unit load (UL), 1.8V powered, single differential receivers (Rx) for balanced (e.g., RS-485) data communication. With their 85µA supply currents, these receivers are optimized for low power applications, and deliver the lowest supply currents of any available single Rx IC (see Figure 1).
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 (see Figure 2), while the larger hysteresis increases noise immunity.
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 (e.g., process automation, remote meter reading systems). The ISL32611E/ISL32612E Rx output is tri-statable via the RE/RE input.
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.
See Table 1 for a summary of each device's features. For a companion 1.8V differential transmitter in a SOT-23 package, reference the ISL32613E data sheet.
Applications
- Industrial/Process Control Networks, Factory Automation
- High Node Count Networks
- Space Constrained Systems
- Building Environmental Control Systems
