Real Time Devices AD1200 User Manual page 90

intel'
r Compatlble wlth all Intel and most
other mlcroprocessors
r Hlgh Speed, "Zero Walt State"
Operatlon wlth 8 MHz 8086/88 and
80186/188
I Handles Inputs from DC to 8 MHz
- 10 MHz for 82C54-2
r Avallable In EXPRESS
- Standard Temperature Range
- Extended Temperature Range
82C54
CHMOS PROGRAMMABLE INTERVAL TIMER
I Three Independent 16-blt counters
I Low Power CHMOS
- lcc : 10 mA o 8 MHz Count
frequency
r Completely TTL Compatlble
r Six Programmable Counter Modes
I Blnary or BCD countlng
I Status Read Back Command
I Avallable In 24-Pln DIP and 28-Pln 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. lt 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 th€ HMOS 8254, and is a superset of the 8253.
Six programmable timer modes allow the 82C54 to be used as an 6vsnt counter, elaps€ct time indicator,
programmable one-shot, and in many other applications.
The 82C54 is fabricated on Intel's advanced CHMOS lll technology which provides low power consumption
with performance equalto or greater than the equivalent HMOS product. The 82C54 is available in 24-pin DIP
and 28-pin plastic leaded chip carrier (PLCC) packages.
OIOCI
coiilEn
Oa
Dt
Or
Ot
DO
c3
AI
AO
c|.x2
oalEocaao xc
23124/--3
PLASNC LEADED CHIP CAFRIER
2312U-1
Flgure 1.82C54 Block Dlagram
O,
Or
Or
D.
Dr
Ot
Dr
Oo
.cLx 0
out 0
OAIE O
or{D
Ycc
m
m
d-s
At
Aa
cLr 2
oul 2
OATC 2
cLx r
CATE T
ouT t
231244-2
Diagrams ar€ lor pin reterenc€ only.
Package sizes ar6 not to scal€.
Ffgure 2.82C54 Plnout
6
,
I
9
t0
lt
t 2 l t ' . t s $ ? l l
2a
tt
t2
21
20
rt
ra
rt
!3
rt
t a
'|l
I
2
3
a
5
t
I
a
c
t0
I t
l 2
scPtGmbor 1989
Ordcr Numbcn 231244405
3-83