74F779 Philips, 74F779 Datasheet - Page 3

• Manufacturer Part Number: 74F779
• Description: 8-bit bidirectional binary counter 3-State
• Manufacturer: Philips

Philips Semiconductors
LOGIC SYMBOL
LOGIC SYMBOL (IEEE/IEC)
1989 Sep 20
V
GND=Pin 4
8-bit bidirectional binary counter (3-State)
CC
=Pin 13
15
14
9
11
10
14
15
9
CET
CP
OE
I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7
16
0
1
EN4
2 +/C5
1–
EN6
1
M
CTR DIV 256
2
11
S0
—
0
3
[128]
4, 5, 8 CT=0
4, 5, 8 CT=256
[16]
[32]
[64]
LOAD
DOWN
UP
HOLD
[1]
[2]
[4]
[8]
3
5
S1
10
6
6
SF01261
7
16
1
2
5
6
8
3
7
12
8
TC
SF01260
12
3
FUNCTION TABLE
H = High voltage level
L = Low voltage level
X = Don’t care
(not LL) = S0 and S1 should never be Low voltage level at the
S1
(not LL)
H
X
X
L
L
= Low-to-High clock transition
S0
X
X
H
L
L
INPUTS
same time in the hold mode only.
CET
X
X
X
H
L
L
OE
H
H
X
X
X
L
CP
X
X
I/O0 to I/O7 in High impedance
Flip-flop outputs appear on I/O lines
Parallel load all flip-flops
Hold (TC held High)
Count up
Count down
OPERATING MODE
Product specification
74F779