Tandy 1000 HX Technical Reference Manual page 112

8253/8253-5
PROGRAMMABLE INTERVAL TIMER
MCS-85TM Compatible 8253-5
3 Independent 16-Bit Counters
DC to 2.6 MHz
Programmable Counter Modes
Count Binary or BCD
Single +5V Supply
Available in EXPRESS
— Standard Temperature Range
— Extended Temperature Range
The Intel® 8253 is a programmable counter/timer device designed for use as an Intel microcomputer peripher-
al. It uses NMOS technology with a single + 5V supply and is packaged in a 24-pin plastic DIP.
it is organized as 3 independent 16-bit counters, each with a count rate of up to 2.6 MHz. All modes of
operation are software programmable.
Figure 2. Pin Configuration
Figure 1. Block Diagram
2-14
NOV0fnb6T 1996
Order Number 231306-001