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Part Number 74C922-SO

Copyright © 2014 ABCircuits. Revised September 2014 Page 1 of 10

SIOA7 IC

Stand Alone UART IC

7 bits of input and 7 bits of output

Expandable and Addressable

General Description

The SIOA7 IC is a stand alone UART designed to provide 7 bits of input and output data.

(Expandable to 112 bits.) The SIOA7 may connect to RS-232, USB, RS-485, 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

SIOA7 has internal pull resistors on most inputs to minimize additional parts. After receiving an

address byte matching the ADR0-3 pins is received on the SIN- pin, the next bye received on the

SIN- pin is placed on the OA0-6 pins and the data on the IA0-6 pins are transmitted SOUT- pin.

A positive pulse is generated on the RXP pin every time a byte is placed on the OA0-6 pins.

More than one SIOA7 chip may be connected together to achieve up to 112 bits of input and

output. The serial format to the SIOA7 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 28 pin

.3 inch width SOIC package.

Features

bits of input and 7 bits of output,

expandable to 112 bits.

USB or Ethernet or UART.

contacts, optocouplers, and logic.

most inputs.

transistors, optocouplers, and logic.

typical.

Applications