74f569 NXP Semiconductors, 74f569 Datasheet - Page 4

• Manufacturer Part Number: 74f569
• Description: 4-bit Bidirectional Binary Synchronous Counter 3-state
• Manufacturer: NXP Semiconductors

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