Specifications

DESIGN SPECIFICATIONS

Detailed IS4920 Electrical Specifications

Absolute Maximum Ratings

Signal Signal Description MIN MAX

Vinput

Voltage Applied to Any input pin

(except D+ and D-) *

-0.3V 5.5V

Voutput

Voltage Applied to Any output pin **

-0.3V VIN + .3V

* For USB version, Voltages on D+ and D- signal must conform to USB Specification

** Voutput must be less than 5.5V for all pins

DC Operating Voltages

Signal Signal Description MIN MAX

VIN Operating Voltage 3V 5.5V

VIH(1) Input High (RX, CTS) 2.5V

VIL(1) Input Low (RX, CTS) .8V

VIH(2) Input High (TTL_INV, nWake) .8*VIN

VIL(2) Input Low (TTL_INV, nWake) .8V

VIH(3) Input High (Trigger) .8*VIN

VIL(3) Input Low (Trigger) .25V

VOH(1) Output High Voltage (TX,RTS) .8*VIN

VOL(1) Output Low Voltage (TX,RTS) .14*VIN

VOH(2)

Output High Voltage

(nBeeper, nGoodRead)

***

5.5V

VOL(2)

Output Low Voltage

(nBeeper, nGoodRead)

.55V

VOH(3) Output High Voltage (Power down)

***

5.5V

VOL(3) Output Low Voltage (Power down) .2V

***

PWRDWN, nGoodRead, and nBeeper are open drain outputs w/ 100K pull ups to VIN.

Actual VOH will be determined by the parallel resistance of the 100K pull up and any

external impedances