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74LS569 Datasheet

  • 74LS569

  • FOUR-BIT UP/DOWN COUNTER WITH THREE-STATE OUTPUTS

  • 8頁

  • MOTOROLA   MOTOROLA

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SN54/74LS569A
FOUR-BIT UP/DOWN COUNTER
WITH THREE-STATE OUTPUTS
The SN54 / 74LS569A is designed as programmable up/down BCD and
Binary counters respectively. These devices have 3-state outputs for use in
bus organized systems. With the exception of output enable (OE) and
asynchronous clear (ACLR), all functions occur on the positive edge of the
clock pulse (CP).
When the LOAD input is LOW, the outputs will be programmed by the
parallel data inputs (A, B, C, D) on the next clock edge. Enabling of the
counters occurs only when CEP and CET are LOW and LOAD is HIGH.
Direction of the count is controlled by the up-down input (U/D), HIGH counts
up and LOW counts down. High-speed counting and cascading is implement-
ed by internal look-ahead carry logic and an active LOW ripple carry output
(RCO). On the LS569A, the RCO is LOW at binary 15 during up-count and
during down-count it is also LOW at binary 0. During normal cascading
operation RCO connected to the succeeding block at CET is the only
requisite. When counting and when RCO is LOW, the clocked carry output
(CCO) provides a HIGH-LOW-HIGH pulse for a duration equal to the LOW
time of the clock pulse. Two active LOW reset lines are provided, a master
reset asynchronous clear (ACLR) and a synchronous clear (SCLR). When in
a HIGH state, the output control (OE) input forces the counter output into a
HIGH impedance state and when LOW, the counter outputs are enabled.
FOUR-BIT UP/ DOWN COUNTER
WITH THREE-STATE OUTPUTS
LOW POWER SCHOTTKY
20
1
J SUFFIX
CERAMIC
CASE 732-03
20
1
N SUFFIX
PLASTIC
CASE 738-03
鈥?/div>
ESD > 3500 Volts
CONNECTION DIAGRAM
(TOP VIEW)
20
V
CC
20
RCO
19
CCO
18
OE
17
Y
A
16
Y
B
15
Y
C
14
Y
D
13
CET
12
LOAD
11
V
= PIN 20
CC
GND = PIN 10
DW SUFFIX
SOIC
CASE 751D-03
1
ORDERING INFORMATION
SN54LSXXXJ
Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
Note: Pin 1 is marked
for orientation.
1
U/D
2
CP
3
A
4
B
5
C
6
D
7
8
9
10
GND
CEP ACLR SCLR
GUARANTEED OPERATING RANGES
Symbol
VCC
TA
IOH
IOH
IOL
IOL
Supply Voltage
Operating Ambient Temperature Range
Output Current 鈥?High Except RCO, CCO
Output Current 鈥?High RCO, CCO
Output Current 鈥?Low Except RCO, CCO
Output Current 鈥?Low, RCO, CCO
Parameter
54
74
54
74
54
74
54, 74
54
74
54
74
Min
4.5
4.75
鈥?55
0
Typ
5.0
5.0
25
25
Max
5.5
5.25
125
70
鈥?1.0
鈥?2.6
鈥?0.44
12
24
4.0
8.0
Unit
V
擄C
mA
mA
mA
mA
FAST AND LS TTL DATA
5-573

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