MC74HC161 ONSEMI [ON Semiconductor], MC74HC161 Datasheet - Page 10

• Manufacturer Part Number: MC74HC161
• Description: Presettable Counters
• Manufacturer: ONSEMI [ON Semiconductor]

ENABLE P
ENABLE T
CLOCK
RESET
LOAD
P0
P2
P3
P1
10
3
4
5
6
7
1
9
2
R
LOAD
LOAD
C
C
Enable flip–flop is a combination of a D flip–flop and a T flip–flop. When loading data from
Preset inputs P0, P1, P2, and P3, the Load signal is used to disable the Toggle input (Tn) of
the flip–flop. The logic level at the Pn input is then clocked to the Q output of the flip–flop
on the next rising edge of the clock.
output of the flip–flop low.
The flip–flops shown in the circuit diagrams are Toggle–Enable flip–flops. A Toggle–
A logic zero on the Reset device input forces the internal clock (C) high and resets the Q
T0
R
C
C
LOAD
LOAD
P0
T1
R
C
C
LOAD
LOAD
P1
T2
R
C
C
LOAD
LOAD
P2
T3
R
C
C
LOAD
LOAD
P3
Q0
Q0
Q1
Q1
Q2
Q2
Q3
V CC = PIN 16
GND = PIN 8
14
13
12
11
15
Q0
Q1
Q2
Q3
RIPPLE
CARRY
OUT