74F569 查看數據表（PDF） - Philips Electronics
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74F569 Datasheet PDF : 14 Pages
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Philips Semiconductors
4-bit bidirectional binary synchronous counter (3-State)
Product specification
74F569
COUNT
CET
TC
CP
CP
TO ALL STAGES
CET
TC
CET
TC
CET
TC
Figure 1. Multistage Counter with Ripple Carry
CET
TC
SF01059
COUNT
CET
TC
CEP
CEP
CEP
CEP
CP
LOW CET
TC
CET
TC
CET
TC
CET
CP
TO ALL STAGES
Figure 2. Multistage Counter with Look-Ahead Carry
SF01061
STATE DIAGRAM
0
1
2
3
4
15
5
14
6
13
7
12
11
10
9
8
COUNT DOWN
COUNT UP
SF01058
CC FUNCTION TABLE
INPUTS
OUTPUT
SR
PE CEP CET TC* CP
CC
L
X
X
X
X
X
H
X
L
X
X
X
X
H
X
X
H
X
X
X
H
X
X
X
H
X
X
H
X
X
X
X
H
X
H
H
H
L
L
L
* = TC is generated internally
H = High voltage level
L = Low voltage level
X = Don’t care
= Low Pulse
FUNCTION TABLE
INPUTS
MR
SR
PE
CEP
CET
U/D
L
X
X
X
X
X
h
l
X
X
X
X
h
h
l
X
X
X
h
h
h
l
l
h
h
h
h
l
l
l
h
H
H
H
X
X
h
H
H
X
H
X
H = High voltage level
h = High voltage level one setup time prior to the Low-to-High clock transition
L = Low voltage level
l = Low voltage level one setup time prior to the Low-to-High clock transition
X = Don’t care
↑ = Low-to-High clock transition
OPERATING MODE
CP
X
Asynchronous reset
↑
Synchronous reset
↑
Parallel load
↑
Count Up (increment)
↑
Count Down (decrement)
X
Hold (do nothing)
X
1996 Jan 05
4
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