ITT - Index of

ITT
ITT371, ITT371 H
DECADE COUNTER
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SEMICONDUCTORS
DECADE COUNTER
The ITT371 HLL MS1 counter generates BCD
on its outputs. It has direct set inputs for each
of its four internal f1ip·flops and a common
reset. Two clock inputs are provided, facilitat·
ing the input ENABLE function. A ninth count
output is provided as a carry output for cascad·
ing 371's so a decimal number of any size
may be generated. The passive outputs are
ideal inputs to the 380 Series BCD decoders.
The 371 is level sensitive, counting as the clock
goes low. Holding either clock low will inhibit
the count sequence. Direct set or reset is accomplished
by switching the desired input high.
All unused direct set and reset inputs must be
grounded.
Pin Configuration
ABSOLUTE MAXIMUM RATINGS
Characteristics
Units
Storage Temperature Range .. -65· to +150·C
Operating Temperature Range
371H·1,371-1 ......... -55·C to +125·C
371H-5 ................ -30·C to +75·C
371-5 .............•... -30·C to +85·C
Lead Temperature, 1/16 inch from
case, 60 seconds Maximum .......• 300·C
Supply Voltage
Continuous ............ " . " .•... +16.5V
Pulsed 0.1 Second ................. 18V
Input Voltage (exclusive of expanders)
371-1, 371-5 .............. -D.5V to 16.5V
371H-1, 371H-5 ............ -0.5V to 18V
Input Voltage - E~panders ........ OV to 6.0V
Voltage applied to output ...... -0.5V to Vee
Sink Current, Continuous Buffers ...... 80mA
All Other Devices ...............•. 25mA
Output short circuit duration
to ground ................... Continuous
(Not more than 1 output shorted simultaneously)
Maximum package power dissipation (free air)
at +125· ...................... 500mw
at +85· ....................•.. 900mw
Logic Diagram
r---OS1
CP1o-........ ----r' Jl---'~-o
.-----iI--OS2
r---i,--OS4
...-r-.,:--'f"""' r-"""'::""f---004
i~co
o
R
5-47