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SN54ALS161B_07 Datasheet(PDF) 2 Page - Texas Instruments

Part No. SN54ALS161B_07
Description  SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
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Maker  TI [Texas Instruments]
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SN54ALS161B, SN54ALS162B, SN54ALS163B, SN54AS161, SN54AS163
SN74ALS161B, SN74ALS163B, SN74AS161, SN74AS163
SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SDAS276A – DECEMBER 1994 – REVISED JULY 2000
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
produces a high-level pulse while the count is maximum (9 or 15, with QA high). The high-level overflow
ripple-carry pulse can be used to enable successive cascaded stages. Transitions at ENP or ENT are allowed,
regardless of the level of CLK.
These counters feature a fully independent clock circuit. Changes at control inputs (ENP, ENT, or LOAD) that
modify the operating mode have no effect on the contents of the counter until clocking occurs. The function of
the counter (whether enabled, disabled, loading, or counting) is dictated solely by the conditions meeting the
stable setup and hold times.
The SN54ALS161B, SN54ALS162B, SN54ALS163B, SN54AS161, and SN54AS163 are characterized for
operation over the full military temperature range of – 55
°C to 125°C. The SN74ALS161B, SN74ALS163B,
SN74AS161, and SN74AS163 are characterized for operation from 0
°C to 70°C.
logic symbols
14
13
12
11
CTRDIV10
LOAD
1, 5D
3
A
4
B
5
C
6
D
5CT=0
1
M2
M1
9
C5/2,3,4+
G3
10
ENT
RCO
15
3CT=9
QA
QB
QC
QD
G4
7
ENP
2
CLK
CLR
SN54ALS162B DECADE COUNTER
WITH SYNCHRONOUS CLEAR
14
13
12
11
CTRDIV16
LOAD
1, 5D
3
A
4
B
5
C
6
D
CT=0
1
M2
M1
9
C5/2,3,4+
G3
10
ENT
RCO
15
3CT=15
QA
QB
QC
QD
G4
7
ENP
2
CLK
CLR
[1]
[2]
[4]
[8]
’ALS161B AND ’AS161 BINARY COUNTERS
WITH DIRECT CLEAR
14
13
12
11
CTRDIV16
LOAD
1, 5D
3
A
4
B
5
C
6
D
5CT=0
1
M2
M1
9
C5/2,3,4+
G3
10
ENT
RCO
15
3CT=15
QA
QB
QC
QD
G4
7
ENP
2
CLK
CLR
’ALS163B AND ’AS163 BINARY COUNTERS
WITH SYNCHRONOUS CLEAR
[1]
[2]
[4]
[8]
[1]
[2]
[4]
[8]
† These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the D, DB, J, and N packages.




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