INTERVAL TIMER. 82C54 Datasheet

82C54 Datasheet PDF, Equivalent


Part Number

82C54

Description

CHMOS PROGRAMMABLE INTERVAL TIMER

Manufacture

Intel Corporation

Total Page 18 Pages
PDF Download
Download 82C54 Datasheet PDF


82C54 Datasheet
82C54
CHMOS PROGRAMMABLE INTERVAL TIMER
Y Compatible with all Intel and most
other microprocessors
Y High Speed ‘‘Zero Wait State’’
Operation with 8 MHz 8086 88 and
80186 188
Y Handles Inputs from DC
10 MHz for 82C54-2
Y Available in EXPRESS
Standard Temperature Range
Extended Temperature Range
Y Three independent 16-bit counters
Y Low Power CHMOS
ICC e 10 mA 8 MHz Count
frequency
Y Completely TTL Compatible
Y Six Programmable Counter Modes
Y Binary or BCD counting
Y Status Read Back Command
Y Available in 24-Pin DIP and 28-Pin PLCC
The Intel 82C54 is a high-performance CHMOS version of the industry standard 8254 counter timer which is
designed to solve the timing control problems common in microcomputer 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 82C54 is pin compatible with the HMOS 8254 and is a superset of the 8253
Six programmable timer modes allow the 82C54 to be used as an event counter elapsed time indicator
programmable one-shot and in many other applications
The 82C54 is fabricated on Intel’s advanced CHMOS III technology which provides low power consumption
with performance equal to or greater than the equivalent HMOS product The 82C54 is available in 24-pin DIP
and 28-pin plastic leaded chip carrier (PLCC) packages
231244 – 3
PLASTIC LEADED CHIP CARRIER
231244 –1
Figure 1 82C54 Block Diagram
October 1994
231244 – 2
Diagrams are for pin reference only
Package sizes are not to scale
Figure 2 82C54 Pinout
Order Number 231244-006

82C54 Datasheet
82C54
Symbol
D7-D0
CLK 0
OUT 0
GATE 0
GND
OUT 1
GATE 1
CLK 1
GATE 2
OUT 2
CLK 2
A1 A0
CS
RD
WR
VCC
NC
Pin Number
DIP PLCC
1-8 2-9
9
10
11
12
13
14
15
16
17
18
20-19
10
12
13
14
16
17
18
19
20
21
23-22
21 24
22 26
23 27
24 28
1 11 15 25
Table 1 Pin Description
Type
Function
I O Data Bidirectional tri-state data bus lines
connected to system data bus
I Clock 0 Clock input of Counter 0
O Output 0 Output of Counter 0
I Gate 0 Gate input of Counter 0
Ground Power supply connection
O Out 1 Output of Counter 1
I Gate 1 Gate input of Counter 1
I Clock 1 Clock input of Counter 1
I Gate 2 Gate input of Counter 2
O Out 2 Output of Counter 2
I Clock 2 Clock input of Counter 2
I Address Used to select one of the three Counters
or the Control Word Register for read or write
operations Normally connected to the system
address bus
A1 A0
Selects
0 0 Counter 0
0 1 Counter 1
1 0 Counter 2
1 1 Control Word Register
I Chip Select A low on this input enables the 82C54
to respond to RD and WR signals RD and WR are
ignored otherwise
I Read Control This input is low during CPU read
operations
I Write Control This input is low during CPU write
operations
Power a5V power supply connection
No Connect
FUNCTIONAL DESCRIPTION
General
The 82C54 is a programmable interval timer counter
designed for use with Intel microcomputer systems
It is a general purpose multi-timing element that can
be treated as an array of I O ports in the system
software
The 82C54 solves one of the most common prob-
lems in any microcomputer system the generation
of accurate time delays under software control In-
stead of setting up timing loops in software the pro-
grammer configures the 82C54 to match his require-
ments and programs one of the counters for the de-
sired delay After the desired delay the 82C54 will
interrupt the CPU Software overhead is minimal and
variable length delays can easily be accommodated
Some of the other counter timer functions common
to microcomputers which can be implemented with
the 82C54 are
 Real time clock
 Even counter
 Digital one-shot
 Programmable rate generator
 Square wave generator
 Binary rate multiplier
 Complex waveform generator
 Complex motor controller
2


Features Datasheet pdf 82C54 CHMOS PROGRAMMABLE INTERVAL TIMER Y Compatible with all Intel and most o ther microprocessors High Speed ‘‘Z ero Wait State’’ Operation with 8 M Hz 8086 88 and 80186 188 Handles Inputs from DC 10 MHz for 82C54-2 Available i n EXPRESS Standard Temperature Range Ex tended Temperature Range Y Y Three in dependent 16-bit counters Low Power CHM OS ICC e 10 mA 8 MHz Count frequency Co mpletely TTL Compatible Six Programmabl e Counter Modes Binary or BCD counting Status Read Back Command Available in 2 4-Pin DIP and 28-Pin PLCC Y Y Y Y Y Y Y Y The Intel 82C54 is a high-perf ormance CHMOS version of the industry s tandard 8254 counter timer which is des igned to solve the timing control probl ems common in microcomputer system desi gn It provides three independent 16-bit counters each capable of handling cloc k inputs up to 10 MHz All modes are sof tware programmable The 82C54 is pin com patible with the HMOS 8254 and is a sup erset of the 8253 Six programmable timer modes allow the 82C54 to be us.
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