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Silicon Gate MOS
8253
PROGRAMMABLE INTERVAL TIMER
GATE 0
It uses nMOS technology
~----"OUT2
ClKO
ClK2
ClK
1
...------..OUT
0
COU':;TER
14'-_
GATE 2
COUNTER
#1 GATE 1
.....---.
OUT 1
z.
~Jmodes'of
operation are
v
"'."-
~O
S"
,9
• Count Binary
or
BCD
• Single
+5V
SUPR
•
24
Pin Dual-in-li
CONTROL
WORD
REGISTER
AND
MODE
SELECTION
PIN
CONFIGURATION
• 3 Independent 16-Bit
Counters
•
DC
to
3 MHz
• Programmable Counter
Modes
The 8253
is
a programmable
counter/timer
chip designed for use
as
an
8080
(or
with a single +5V supply and
is
packaged
in
a 24-pin plastic DIP.
It
is
organized as three independent 16-bit counters, each with a
count
rat
software programmable by
the
8080.
INTERNAL
BUS
/
5-169