SI14 Datasheet, PDF (1/6 Pages) ABCircuits – Serial Input IC For 14 Bits of Input

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SI14 IC
Serial Input IC For 14 Bits of Input
General Description
The SI14 IC is designed to provide 14 bits of input data to connect to RS-232, RS-485, USB,
Ethernet or directly to your UART. Inputs can be from switches, relay contacts, logic,
optocouplers or a transistor switched to ground. The SI14 has internal pull resistors on the inputs
to minimize additional parts. The SI14 IC transmits data anytime the inputs change or after a
delay of 100 or 1000 mS. The output of the SI14 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. This part may be paired with the SO14 chip to achieve 14
bits of input and output, except on RS-485 interfaces.
Features
• Asynchronous serial input for up to
14 bits of data.
• For input monitoring using RS-232,
RS-485, USB or Ethernet or UART.
• Connects to switches, relay
contacts, 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.
• On chip input pull up resistors on all
inputs.
• TTL and CMOS compatible outputs.
• Part is in full production.
• SOIC and DIP 20 Pin Package.
• ROHS Compliant
• Low EMI
Applications
• Input 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 6