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8253/8253·5
PROGRAMMABLE INTERVAL TIMER
•
MCS-85™
Compatible
8253·5
• Count Binary or
BCD
• 3 Independent 16·Blt Counters
• Single
+
5V
Supply
•
DC
to
2 MHz
• Programmable Counter Modes • 24·Pin Dual In·Line Package
The
IntelC!>
8253
is a programmable counter/timer chip designed for use
as
an
Intel microcornputer peripheral. 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
MHz.
All modes of operation
are
soft·
ware programmable.
PIN
CONFIGURATION
0,
Vee
o.
ViR
Ali
0,
~
oJ
A,
0,
Ao
0,
eLK
2
Do
OUT 2
eLK
0
GATE
2
OUT 0
eLK
1
GATE 0
GATE
1
GNO
OUT 1
PIN NAMES
°7,0
DATABUS(8BtTf
elK
N COUNTER
CLOCK
INPUTS
GATE
N
COUNTER
GATE
INPUTS
OUT N COUNTER OUTPUTS
RD
READ
COUNTER
WR
WRITE
COMMAND
OR
OAT
A
CS
CHIP SELECT
A~A
COUNnR
SELECT
Vee
+5
VOL
T5
GND
GROUND
RD
--~-CI
AO---~
Al~-
DATA
BUS
BUFFER
BLOCK
DIAGRAM
CS--------'
INTERNAL BUS /
COUNTER
"2
elK
0
GATE
0
our 0
elK
1
GATE
1
OUT
1
eLK
2
GATE
2
OUT
2
INTEL
CORPORATION
ASSUMES
NO
RESPONSIBILITY
FOR
THE
USE
OF
ANY
CIRCUITRY
OTHER
THAN
CIRCUITRY
EMBODIED
IN
AN
INTEL
PRODUCT.
NO
OTHER
CIRCUIT
PATENT
LICENSES
ARE
IMPlIEO.
<lINTEl
r.ORPORATION.
1179
9-6 AFN-00145A·01