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Part Number 74C922-SO

Copyright © 2014 ABCircuits. Revised September 2014 Page 1 of 7

SIO7 IC

Serial input/output IC for 7 bits of input and 7 bits of

output

General Description

The SIO7 IC is designed to provide 7 bits of input and output data to connect to RS-232, USB,

Ethernet or directly to your UART. Outputs can be used to drive relays, logic, optocouplers or a

transistors. Inputs can be from switches, relay contacts, logic, optocouplers or a transistor

switched to ground. The SIO7 has internal pull resistors on the inputs to minimize additional

parts. The SIO7 IC transmits data anytime the inputs change or every of 100 mS. The serial

format to the SIO7 is standard asynchronous format, using 8 bits, 1 stop and no parity at 9600

BPS. Other formats and encoding are available, contact the factory. A .1 uF bypass capacitor is

suggested across the VDD and VSS pins. The part uses the standard 20 pin .3 inch width SOIC

package. A full duplex data channel is required, do not use RS -485 or a half duplex data channel

with this part. The SAIO7 IC may be used if your design requires a half duplex data channel.

Features

bits of input and 7 bits of output.

Ethernet or UART.

contacts, optocouplers, and logic.

inputs.

transistors, optocouplers, and logic.

typical.

Applications