Intel 8253 - Programmable Interval Timer

September 1993 Order Number: 231164-005
8254
PROGRAMMABLE INTERVAL TIMER
Y
Compatible with All Intel and Most
Other Microprocessors
Y
Handles Inputs from DC to 10 MHz
Ð 8 MHz 8254
Ð 10 MHz 8254-2
Y
Status Read-Back Command
Y
Six Programmable Counter Modes
Y
Three Independent 16-Bit Counters
Y
Binary or BCD Counting
Y
Single
a
5V Supply
Y
Available in EXPRESS
Ð Standard Temperature Range
The Intel 8254 is a counter/timer device designed to solve the common timing control problems in microcom-
puter system design. It provides three independent 16-bit counters, each capable of handling clock inputs up
to 10 MHz. All modes are software programmable. The 8254 is a superset of the 8253.
The 8254 uses HMOS technology and comes in a 24-pin plastic or CERDIP package.
231164–1
Figure 1. 8254 Block Diagram
231164–2
Figure 2. Pin Configuration