ISL32612E

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/REinput.

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 V_CC = 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.

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

Industrial/Process Control Networks, Factory Automation

High Node Count Networks

Space Constrained Systems

Building Environmental Control Systems

		Alternatives
Parameters	ISL32612E	ISL32610E	ISL32611E	ISL3282EMRTEP
Key Feature	Low Power	Low Power	Low Power	Ruggedized
# of Tx	0	0	0	0
# of Rx	1	1	1	1
Devices Allowed on Bus	256	256	256	256
Half/Full Duplex	N/A	N/A	N/A	N/A
High ESD?	Yes-IEC61000	Yes-IEC61000	Yes-IEC61000	Yes-IEC61000
Hot Plug	No	No	No	No
Data Rate	0.256 Mbps	0.256 Mbps	0.256 Mbps	16 Mbps
V_CC (min)	1.8 V	1.8 V	1.8 V	3 V
V_CC (max)	3.6 V	3.6 V	3.6 V	5.5 V
Slew Rate Limited	N/A	N/A	N/A	N/A
Tx/Rx Enable	Yes - Active High	No	Yes - Active Low	Yes
I_S Enabled/Disabled	85 μA	85 μA	85 μA	500 μA
SHDN I_CC	.007 μA	N/A μA	.002 μA	20 μA
V_L Pin	No	No	No	Yes
Qualification Level	Standard	Standard	Standard	Standard