SIOA7 Datasheet, PDF (1/10 Pages) ABCircuits – Stand Alone UART IC 7 bits of input and 7 bits of output Expandable and Addressable

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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
• Asynchronous serial control for 7
bits of input and 7 bits of output,
expandable to 112 bits.
• Can connect with RS-232, RS -485,
USB or Ethernet or UART.
• Inputs can be switches, relay
contacts, optocouplers, and logic.
• On chip input pull up resistors on
most inputs.
• Outputs can be used to drive relays,
transistors, optocouplers, and logic.
• No external parts required.
• Low power consumption 5 mA
typical.
• Supply voltage 2.4 to 5.25 volts.
• All timing internally generated.
• TTL and CMOS compatible outputs.
• Part is in full production.
• SOIC and DIP 28 Pin Package.
• ROHS Compliant
• Low EMI
Applications
• Input Output Expansion
• Remote control
• Process control
• Building Automation
• Off site monitoring
• Security systems
• Internet of things
• Machine control
Part Number 74C922-SO
Copyright © 2014 ABCircuits. Revised September 2014 Page 1 of 10