Presettable BCD/Decade UP/DOWN CounterThe IN74HC192 is identical in pinout to the LS/ALS192. The
device inputs are compatible with standard CMOS outputs; with
pullup resistors, they are compatible with LS/ALSTTL outputs.
The Counter has two separate Clock inputs, a Count Up Clock and
Count Down Clock inputs. The direction of counting is determined
by which input is clocked. The outputs change state synchronous
with the LOW-to-HIGH transitions on the Clock inputs. This Counter
may be preset by entering the desired data on the P0, P1, P2, P3
input. When the Parallel Load input is taken low the data is loaded
independently of either Clock input. This feature allows the Counters
to be used as devide-by-n by modifying the count lenght with the
preset inputs. In addition the Counter CAN also be cleared. This is
accomplished by inputting a high on the Master Reset input. All 4
internal stages are set to low independently of either Clock input.Both
a Terminal Count Down (TCD) and Terminal Count Up (TCU)
Outputs are provided to enable cascading of both up and down
counting functions. The TCD output produces a negative going pulse
when the Counter underflows and TCU outputs a pulse when the
Counter overflows. The Counter CAN be cascaded by connecting the
TCU and TCD outputs of one device to the Count Up Clock and
Count Down Clock inputs, respectively, of the next device. By Integral Corp.
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