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SN54ALS160B Datasheet(PDF) 10 Page - Texas Instruments

Part No. SN54ALS160B
Description  SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

SN54ALS160B Datasheet(HTML) 10 Page - Texas Instruments

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SN54ALS160B THRU SN54ALS163B, SN54AS160 THRU SN54AS163
SN74ALS160B THRU SN74ALS163B, SN74AS160 THRU SN74AS163
SYNCHRONOUS 4-BIT DECADE COUNTERS
SDAS024A – D2661, APRIL 1982 – REVISED MAY 1986
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
10
APPLICATION INFORMATION
N–bit synchronous counters
This application demonstrates how the ripple mode carry circuit (Figure 1) and the carry-look-ahead circuit
(Figure 2) can be used to implement a high-speed N-bit counter. The ’ALS160B, ’AS160, ’ALS162B, and ’AS162
will count in BCD and the ’ALS161B, ’AS161, ’ALS163B, and ’AS163 will count in binary. When additional stages
are added, the fMAX decreases in Figure 1 , but remains unchanged in Figure 2.
fMAX = 1/(CLK to RCO tPLH) + (ENP tsu)
fMAX = 1/(CLK to RCO tPLH) + (ENT to RCO tPLH) (N–2) + (ENT tsu)
CLOCK
CLEAR (L)
COUNT (H)
DISABLE (L)
LOAD (L)
LOAD
CLR
ENT
ENP
CLK
A
B
C
CTR
3CT=MAX
QA
QB
QC
QD
CT=0
M1
G3
G4
C5/T,3,4+
1,5D
LSB
D
D
1,5D
C5/T,3,4+
G4
G3
M1
CT=0
QD
QC
QB
QA
3CT=MAX
CTR
C
B
A
CLK
ENP
ENT
CLR
LOAD
D
1,5D
C5/T,3,4+
G4
G3
M1
CT=0
QD
QC
QB
QA
3CT=MAX
CTR
C
B
A
CLK
ENP
ENT
CLR
LOAD
D
1,5D
C5/T,3,4+
G4
G3
M1
CT=0
QD
QC
QB
QA
RCO
3CT=MAX
CTR
C
B
A
CLK
ENP
ENT
CLR
LOAD
RCO
RCO
RCO
To More Significant Stages
CLOCK
DISABLE (L)
COUNT (H)
LOAD (L)
DISABLE (L)
COUNT (H)
CLEAR (L)
To More Significant Stages
RCO
RCO
RCO
LOAD
CLR
ENT
ENP
CLK
A
B
C
CTR
3CT=MAX
RCO
QA
QB
QC
QD
CT=0
M1
G3
G4
C5/T,3,4+
1,5D
D
LOAD
CLR
ENT
ENP
CLK
A
B
C
CTR
3CT=MAX
QA
QB
QC
QD
CT=0
M1
G3
G4
C5/T,3,4+
1,5D
D
LOAD
CLR
ENT
ENP
CLK
A
B
C
CTR
3CT=MAX
QA
QB
QC
QD
CT=0
M1
G3
G4
C5/T,3,4+
1,5D
D
D
LSB
1,5D
C5/T,3,4+
G4
G3
M1
CT=0
QD
QC
QB
QA
3CT=MAX
CTR
C
B
A
CLK
ENP
ENT
CLR
LOAD
Figure 1. Ripple Mode Carry Circuit
Figure 2. Carry-Look-Ahesd Circuit


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