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74LS168 Datasheet

  • 74LS168

  • BCD DECADE/MODULO 16 BINARY SYNCHRONOUS BI-DIRECTIONAL COUNT...

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  • MOTOROLA   MOTOROLA

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BCD DECADE/MODULO
16 BINARY SYNCHRONOUS
BI-DIRECTIONAL COUNTERS
The SN54 / 74LS168 and SN54 / 74LS169 are fully synchronous 4-stage
up/down counters featuring a preset capability for programmable operation,
carry lookahead for easy cascading and a U/ D input to control the direction
of counting. The SN54 / 74LS168 counts in a BCD decade (8, 4, 2, 1)
sequence, while the SN54 / 74LS169 operates in a Modulo 16 binary
sequence. All state changes, whether in counting or parallel loading, are
initiated by the LOW-to-HIGH transition of the clock.
SN54/74LS168
SN54/74LS169
BCD DECADE/ MODULO
16 BINARY SYNCHRONOUS
BI-DIRECTIONAL COUNTERS
LOW POWER SCHOTTKY
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Low Power Dissipation 100 mW Typical
High-Speed Count Frequency 30 MHz Typical
Fully Synchronous Operation
Full Carry Lookahead for Easy Cascading
Single Up / Down Control Input
Positive Edge-Trigger Operation
Input Clamp Diodes Limit High-Speed Termination Effects
J SUFFIX
CERAMIC
CASE 620-09
16
1
CONNECTION DIAGRAM DIP
(TOP VIEW)
V
CC
16
TC
15
Q
0
14
Q
1
13
Q
2
12
Q
3
11
CET
10
PE
9
16
1
N SUFFIX
PLASTIC
CASE 648-08
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
1
U/D
2
CP
3
P
0
4
P
1
5
P
2
6
P
3
7
CEP
8
GND
16
1
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
Ceramic
Plastic
SOIC
PIN NAMES
LOADING
(Note a)
HIGH
LOW
0.25 U.L.
0.5 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
5 (2.5) U.L.
5 (2.5) U.L.
CEP
CET
CP
PE
U/D
P0鈥揚(yáng)3
Q0鈥換3
TC
Count Enable Parallel (Active LOW) Input
Count Enable Trickle (Active LOW) Input
Clock Pulse (Active positive going edge) Input
Parallel Enable (Active LOW) Input
Up-Down Count Control Input
Parallel Data Inputs
Flip-Flop Outputs
Terminal Count (Active LOW) Output
0.5 U.L.
1.0 U.L.
0.5 U.L.
0.5 U.L.
0.5 U.L.
0.5 U.L.
10 U.L.
10 U.L.
LOGIC SYMBOL
9
3
4
5
6
PE
1
7
10
2
U/D
CEP
CET
CP
P
0
P
1
P
2
P
3
TC
15
NOTES:
a. 1 TTL Unit Load (U.L.) = 40
碌A(chǔ)
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 (74)
b.
Temperature Ranges.
Q
0
Q
1
Q
2
Q
3
14
13
12
11
V
= PIN 16
CC
GND = PIN 8
FAST AND LS TTL DATA
5-302

74LS168相關(guān)型號(hào)PDF文件下載

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    Quadruple 2-input Positive NOR Gates
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    QUADRUPLE 2-INPUT POSITIVE-NAND GATES WITH OPEN-COLLECTOR OU...
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  • 英文版
    Quadruple 2-input Positive NAND Gates(with Open Colletor Out...
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  • 英文版
    Quad 2-Input NAND Gates with Open-Collector Outputs
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