SN74LS490N Motorola, SN74LS490N Datasheet

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SN74LS490N

Manufacturer Part Number
SN74LS490N
Description
Dual decade counter
Manufacturer
Motorola
Datasheet
DUAL DECADE COUNTER
Each half of the SN54 / 74LS490 has individual Clock, Master Reset and Mas-
ter Set (Preset 9) inputs. Each section counts in the 8, 4, 2, 1 BCD code.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 A HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial
LOGIC DIAGRAM (ONE HALF SHOWN)
MR
PIN NAMES
MS
MR
CP
Q 0 – Q 3
MS
CP
(74) Temperature Ranges.
The SN54 / 74LS490 contains a pair of high-speed 4-stage ripple counters.
Dual Version of SN54 / 74LS490
Individual Asynchronous Clear and Preset to 9 for Each Counter
Count Frequency — Typically 65 MHz
Input Clamp Diodes Limit High-Speed Termination Effects
15
1
14
2
12
4
Master Set (Set to 9) Input
Master Reset
Clock Input (Active LOW Going Edge)
Counter Outputs (Note b)
K
C D
CONNECTION DIAGRAM DIP (TOP VIEW)
V CC
CP a
16
1
3 Q 0 13
S D
Q
J
MR a
CP b
15
2
MR b
Q 0a
14
3
K
C D
Q 0b
MS a
13
4
5 Q 1 11
Q
J
MS b
Q 1a
12
5
Q 1b
Q 2a
11
6
K
C D
FAST AND LS TTL DATA
Q 2b
Q 3a
10
7
6 Q 2 10
0.5 U.L.
0.5 U.L.
1.5 U.L.
Q
J
LOADING (Note a)
HIGH
10 U.L.
GND
Q 3b
9
8
5-563
5 (2.5) U.L.
K
C D
0.25 U.L.
0.25 U.L.
LOW
1.5 U.L.
CP
7 Q 3 9
S D
Q
J
COUNT
16
16
SN54/74LS490
DUAL DECADE COUNTER
ORDERING INFORMATION
0
1
2
3
4
5
6
7
8
9
LOW POWER SCHOTTKY
16
1
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
1
1
TRUTH TABLE
Q 3
H
H
L
L
L
L
L
L
L
L
Ceramic
Plastic
SOIC
OUTPUTS
CASE 751B-03
Q 2
H
H
H
H
CASE 620-09
CASE 648-08
L
L
L
L
L
L
CERAMIC
N SUFFIX
D SUFFIX
J SUFFIX
PLASTIC
SOIC
Q 1
H
H
H
H
L
L
L
L
L
L
Q 0
H
H
H
H
H
L
L
L
L
L

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SN74LS490N Summary of contents

Page 1

DUAL DECADE COUNTER The SN54 / 74LS490 contains a pair of high-speed 4-stage ripple counters. Each half of the SN54 / 74LS490 has individual Clock, Master Reset and Mas- ter Set (Preset 9) inputs. Each section counts in the 8, ...

Page 2

GUARANTEED OPERATING RANGES Symbol Parameter V CC Supply Voltage T A Operating Ambient Temperature Range I OH Output Current — High I OL Output Current — Low DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE Symbol Symbol Parameter Parameter V IH Input ...

Page 3

AC CHARACTERISTICS ( Symbol Symbol Parameter Parameter f MAX Maximum Clock Frequency t PLH Propagation Delay PHL t PLH Propagation Delay PHL t ...

Page 4

G - 0.25 (0.010 - SEATING -T- PLANE 0.25 (0.010) ...

Page 5

... Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different applications. All operating parameters, including “ ...

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