74F579 Datasheet, PDF (3/14 Pages) NXP Semiconductors – 8-bit bidirectional binary counter 3-State

Philips Semiconductors
8-bit bidirectional binary counter (3-State)
Product specification
74F579
LOGIC SYMBOL
13
12
20
19
14
1
PE
CP
CS MR
SR
U/D
18
CEP
17
CET
TC
15
11
OE
I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7
V_CC = Pin 16
GND = Pin 6
2 3 4 5 7 8 9 10
SF01086
LOGIC SYMBOL (IEEE/IEC)
CTR DIV 256
19
1 ^R1
12
u1
1&
M2[LOAD]
13
1
&
11
1
EN3
14
1 M4[DOWN]
1 M5[UP]
17
1 ^EN6
18
& _G7
1
1
2,5,7, +/C8
2,4,7–
20
R9
[1] ^1,2,3,4,
2
5,6,7,8
[2]
3
[4]
4
[8]
5
[16]
6
[32]
8
[64]
9
[128]
10
15
3,5,6,8 CT=256
3,4,6,8 CT=0
SF01087
FUNCTION TABLE
INPUTS
MR
SR
CS
PE
CEP
CET
U/D
OE
X
X
H
X
X
X
X
X
X
X
L
H
X
X
X
H
X
X
L
H
X
X
X
L
L
X
X
X
X
X
X
X
H
L
X
X
X
X
X
X
H
H
L
L
X
X
X
X
H
H
(not LL)
H
X
X
X
H
H
(not LL)
X
H
X
X
H
H
(not LL)
L
L
H
X
H
H
=
L
=
X
=
↑
=
(not LL) =
H
(not LL)
L
L
L
X
High voltage level
Low voltage level
Don’t care
Low-to-High clock transition
CS and PE should never be Low voltage level at the same time.
OPERATING MODE
CP
X I/O0 to I/O7 in high impedance (PE disabled)
X I/O0 to I/O7 in high impedance
X Flip-flop output appears on I/On lines
X Asynchronous reset for all flip-flops
↑ Synchronous reset for all flip-flops
↑ Parallel load all flip-flops
↑ Hold
↑ Hold (TC held High)
↑ Count up
↑ Count down
1992 May 04
3