Xerox I Class GPIO Pin Configuration, External Start of Print Control, GPIO Port Specifications

GPIO Pin Configuration

(as viewed from the rear of the printer)

External Start of Print Control

Connections for an external Start of Print control can be made (1) directly to Pin 8 using a TTL- level input or (2) with an interface circuit similar to the one shown right. For additional interfacing requirements, see the table below.

	GPIO Port Specifications*
Vin max	5.5 VDC maximum input into any pin
VIH	3.8 VDC minimum (high level input voltage)
VIL	1.65 VDC maximum (low level input voltage)
IOH	-8 mA typical, - 25 mA maximum (high level output current)
IOL	8 mA typical 25 mA maximum (low level output current)
VOH	IOH = -8 mA, minimum 3.8 VDC
VOL	IOL = 8 mA, maximum .44 VDC

*See the SN74AHC244 data sheet for more information.

120 I-Class