User Manual

© Sealevel Systems, Inc. - 13 -
PIO-48 User Manual
Electrical Characteristics
The PIO-48 uses 74LS245 octal bi-directional transceivers to provide TTL
input/output capabilities. Each bit is pulled to +5V through a 10K ohm pull-up
resistor to insure each bit is at a known state when not driven.
Specifications
Inputs
 Logic High: Min 2VDC
 Logic Low: Max 0.8VDC
Outputs
 Logic High: Min 2VDC @ 15 mA
 Logic Low: Max 0.5VDC @ 24 mA
Temperature Range
 Operating: 0°C – 70°C
 Storage: -50°C – 105°C
Power Requirements
 +5VDC @ 200mA
 +12VDC @ 25mA
Manufacturing
All Sealevel Systems Printed Circuit boards are built to UL 94V0 rating and are
100% electrically tested. These printed circuit boards are solder mask over bare
copper or solder mask over tin nickel.