74F191 Philips, 74F191 Datasheet - Page 4

• Manufacturer Part Number: 74F191
• Description: Up/down binary counter with reset and ripple clock
• Manufacturer: Philips

Philips Semiconductors
MODE SELECT — FUNCTION TABLE
TC AND RC FUNCTION TABLE
H = High voltage level steady state
L = Low voltage level steady state
X = Don’t care
l
1995 Jul 17
Up/Down binary counter with reset and ripple clock
= Low pulse
= Low-to-High clock transition
= Low voltage level one set-up time prior to the Low-to-High clock transition
U/D
PL
H
H
H
H
H
H
L
L
L
L
L
INPUTS
U/D
CE
X
X
H
X
H
H
H
H
L
L
L
INPUTS
CE
CP
H
X
X
X
X
X
X
l
l
CP
Q
X
X
X
H
H
H
L
L
L
0
TERMINAL COUNT STATE
D
Q
H
X
X
X
L
H
H
H
4
L
L
L
n
1
Count down
OUTPUTS
No change
Q
Count up
H
H
H
L
L
L
2
Q
H
L
n
Q
H
H
H
L
L
L
3
Parallel load
Count up
Count down
Hold (do nothing)
OPERATING MODE
TC
H
H
H
H
L
L
OUTPUTS
Product specification
74F191
RC
H
H
H
H