TL L 8333
DM54LS469DM74LS469
8-Bit
UpDown
Counter
July 1989
DM54LS469 DM74LS469 8-Bit Up Down Counter
General Description
The `LS469 is an 8-bit synchronous up down counter with
parallel load and hold capability Three function-select in-
puts (LD UD CBI) provide one of four operations which
occur synchronously on the rising edge of the clock (CK)
The LOAD operation loads the inputs (D
7
D
0
) into the out-
put register (Q
7
Q
0
) The HOLD operation holds the previ-
ous value regardless of clock transitions The INCREMENT
operation adds one to the output register when the carry-in
input is TRUE (CBI
e
LOW) otherwise the operation is a
HOLD The carry-out (CBO) is TRUE (CBO
e
LOW) when
the output register (Q
7
Q
0
) is all HIGHs otherwise FALSE
(CBO
e
HIGH) The DECREMENT operation subtracts one
from the output register when the borrow-in input is TRUE
(CBI
e
LOW) otherwise the operation is a HOLD The bor-
row-out (CBO) is TRUE (CBO
e
LOW) when the output reg-
ister (Q
7
Q
0
) is all LOWs otherwise FALSE (CBO
e
HIGH)
The output register (Q
7
Q
0
) is enabled when OE is LOW
and disabled (HI-Z) when OE is HIGH The output drivers
will sink the 24 mA required for many bus-interface stan-
dards Two or more `LS469 octal up down counters may be
cascaded to provide larger counters
Features Benefits
Y
8-bit up down counter for microprogram-counter DMA
controller and general-purpose counting applications
Y
8 bits matches byte boundaries
Y
Bus-structured pinout
Y
24-pin SKINNYDIP saves space
Y
TRI-STATE
outputs drive bus lines
Y
Low current PNP inputs reduce loading
Y
Expandable in 8-bit increments
Connection Diagram
Top View
TL L 8333 1
Order Number DM54LS469J
DM74LS469J or DM74LS469N
See NS Package Number J24F or N24C
Standard Test Load
TL L 8333 3
Function Table
OE CK LD UD CBI D7 D0
Q7 Q0
Operation
H
X
X
X
X
X
Z
HI-Z
L
u
L
X
X
D
D
LOAD
L
u
H
L
H
X
Q
HOLD
L
u
H
L
L
X
Q plus 1
INCREMENT
L
u
H
H
H
X
Q
HOLD
L
u
H
H
L
X
Q minus 1 DECREMENT
TRI-STATE
is a registered trademark of National Semiconductor Corp
C1995 National Semiconductor Corporation
RRD-B30M115 Printed in U S A
Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage V
CC
7V
Input Voltage
5 5V
Off-State Output Voltage
5 5V
Storage Temperature
b
65 C to
a
150 C
Operating Conditions
Symbol
Parameter
Military
Commercial
Units
Min
Typ
Max
Min
Typ
Max
V
CC
Supply Voltage
4 5
5
5 5
4 75
5
5 25
V
T
A
Operating Free-Air Temperature
b
55
125
0
75
C
t
W
Width of Clock
Low
40
35
10
ns
High
30
25
t
SU
Set Up Time
60
50
ns
t
h
Hold Time
0
b
15
0
b
15
Case Temperature
Electrical Characteristics
Over Operating Conditions
Symbol
Parameter
Test Conditions
Min
Typ
Max
Units
V
IL
Low-Level Input Voltage
0 8
V
V
IH
High-Level Input Voltage
2
V
V
IC
Input Clamp Voltage
V
CC
e
MIN
I
I
e b
18 mA
b
1 5
V
I
IL
Low-Level Input Current
V
CC
e
MAX
V
I
e
0 4V
b
0 25
mA
I
IH
High-Level Input Current
V
CC
e
MAX
V
I
e
2 4V
25
m
A
I
I
Maximum Input Current
V
CC
e
MAX
V
I
e
5 5V
1
mA
V
CC
e
MIN
MIL
I
OL
e
12 mA
V
OL
Low-Level Output Voltage
V
IL
e
0 8V
0 5
V
V
IH
e
2V
COM
I
OL
e
24 mA
V
CC
e
MIN
MIL
I
OH
e b
2 mA
V
OH
High-Level Output Voltage
V
IL
e
0 8V
2 4
V
V
IH
e
2V
COM
I
OH
e b
3 2 mA
I
OZL
V
CC
e
MAX
V
O
e
0 4V
b
100
m
A
Off-State Output Current
V
IL
e
0 8V
I
OZH
V
IH
e
2V
V
O
e
2 4V
100
m
A
I
OS
Output Short-Circuit Current
V
CC
e
5 0V
V
O
e
0V
b
30
b
130
mA
I
CC
Supply Current
V
CC
e
MAX
120
180
mA
No more than one output should be shorted at a time and duration of the short-circuit should not exceed one second
All typical values are V
CC
e
5V T
A
e
25 C
Switching Characteristics
Over Operating Conditions
Symbol
Parameter
Test Conditions
Military
Commercial
Units
(See Test Load Waveforms)
Min
Typ
Max
Min
Typ
Max
f
MAX
Maximum Clock Frequency
10 5
12 5
MHz
t
PD
CBI to CBO Delay
C
L
e
50 pF
35
60
35
50
ns
t
PD
Clock to Q
R
1
e
200X
20
35
20
30
ns
t
PD
Clock to CBO
R
2
e
390X
55
95
55
80
ns
t
PZX
Output Enable Delay
20
45
20
35
ns
t
PXZ
Output Disable Delay
20
45
20
35
ns
2
Logic Diagram
LS469
TL L 8333 2
3
DM54LS469DM74LS469
8-Bit
UpDown
Counter
Physical Dimensions
inches (millimeters)
24-Pin Narrow Ceramic Dual-In-Line Package (J)
Order Number DM54LS469J or DM74LS469J
NS Package Number J24F
24-Pin Narrow Plastic Dual-In-Line Package (N)
Order Number DM74LS469N
NS Package Number N24C
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NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION As used herein
1 Life support devices or systems are devices or
2 A critical component is any component of a life
systems which (a) are intended for surgical implant
support device or system whose failure to perform can
into the body or (b) support or sustain life and whose
be reasonably expected to cause the failure of the life
failure to perform when properly used in accordance
support device or system or to affect its safety or
with instructions for use provided in the labeling can
effectiveness
be reasonably expected to result in a significant injury
to the user
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