5-573
FAST AND LS TTL DATA
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.
• ESD > 3500 Volts
CONNECTION DIAGRAM (TOP VIEW)
C0049C0056 C0049C0055 C0049C0054 C0049C0053 C0049C0052 C0049C0051
C0049 C0050 C0051 C0052 C0053 C0054 C0055
C0050C0048 C0049C0057
C0056
C0086
C0067C0067
C0085C0047C0068
C0082C0067C0079 C0067C0067C0079 C0079C0069 C0089
C0065
C0089
C0067
C0089
C0066
C0089
C0068
C0067C0080 C0065 C0066 C0067 C0068 C0067C0069C0080 C0065C0067C0076C0082
C0057 C0049C0048
C0083C0067C0076C0082 C0071C0078C0068
C0049C0050 C0049C0049
C0067C0069C0084 C0076C0079C0065C0068
C0086
C0067C0067
C0061 C0080C0073C0078 C0050C0048
C0071C0078C0068 C0061 C0080C0073C0078 C0049C0048
Note: Pin 1 is marked
for orientation.
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
V
CC
Supply Voltage 54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
T
A
Operating Ambient Temperature Range 54
74
–55
0
25
25
125
70
°C
I
OH
Output Current — High Except RCO, CCO 54
74
–1.0
–2.6
mA
I
OH
Output Current — High RCO, CCO 54, 74 –0.44 mA
I
OL
Output Current — Low Except RCO, CCO 54
74
12
24
mA
I
OL
Output Current — Low, RCO, CCO 54
74
4.0
8.0
mA
SN54/74LS569A
FOUR-BIT UP/DOWN COUNTER
WITH THREE-STATE OUTPUTS
LOW POWER SCHOTTKY
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
20
1
J SUFFIX
CERAMIC
CASE 732-03
20
1
N SUFFIX
PLASTIC
CASE 738-03
20
1
DW SUFFIX
SOIC
CASE 751D-03