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74F569 Datasheet(PDF) 4 Page - NXP Semiconductors

Part No. 74F569
Description  4-bit bidirectional binary synchronous counter 3-State
Download  14 Pages
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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74F569 Datasheet(HTML) 4 Page - NXP Semiconductors

 
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Philips Semiconductors
Product specification
74F569
4-bit bidirectional binary synchronous counter (3-State)
1996 Jan 05
4
CET
SF01059
TC
CP
CET
TC
CET
TC
CET
TC
CET
TC
COUNT
CP
TO ALL STAGES
Figure 1. Multistage Counter with Ripple Carry
CET
SF01061
TC
CP
CET
TC
CEP
CET
TC
CEP
CET
TC
CEP
CET
CEP
COUNT
CP
TO ALL STAGES
LOW
Figure 2. Multistage Counter with Look-Ahead Carry
STATE DIAGRAM
0
123
4
5
6
7
8
9
10
11
12
13
14
15
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
OPERATING MODE
MR
SR
PE
CEP
CET
U/D
CP
OPERATING MODE
L
X
X
X
X
X
X
Asynchronous reset
h
l
X
X
X
X
Synchronous reset
h
h
l
X
X
X
Parallel load
h
h
h
l
l
h
Count Up (increment)
h
h
h
l
l
l
Count Down (decrement)
h
H
H
H
X
X
X
Hold (do nothing)
h
H
H
X
H
X
X
Hold (do nothing)
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


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