參數(shù)資料
型號： SN54AS161J
廠商： TEXAS INSTRUMENTS INC
元件分類： 計數(shù)器
英文描述： AS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, CDIP16
封裝： CERAMIC, DIP-16
文件頁數(shù)： 4/26頁
文件大?。?/td> 900K
代理商： SN54AS161J
SN54ALS161B, SN54ALS162B, SN54ALS163B, SN54AS161, SN54AS163
SN74ALS161B, SN74ALS163B, SN74AS161, SN74AS163
SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SDAS276A – DECEMBER 1994 – REVISED JULY 2000
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
n-bit synchronous counters
This application demonstrates how the ripple-mode carry circuit (see Figure 2) and the carry look-ahead circuit
(see Figure 3) can be used to implement a high-speed n-bit counter. The SN54ALS162B counts in BCD. The
’ALS161B, ’AS161, ’ALS163B, and ’AS163 devices count in binary. When additional stages are added, the fmax
decreases in Figure 2, but remains unchanged in Figure 3.
Figure 2. Ripple-Mode Carry Circuit
LOAD
C5/T,3,4+
QA
QB
QC
QD
CLR
A
B
C
D
CTR
CT=0
M1
G3
G4
RCO
CLK
ENP
ENT
3CT=MAX
1,5D
LOAD
C5/T,3,4+
QA
QB
QC
QD
CLR
A
B
C
D
CTR
CT=0
M1
G3
G4
RCO
CLK
ENP
ENT
3CT=MAX
1,5D
LOAD
C5/T,3,4+
QA
QB
QC
QD
CLR
A
B
C
D
CTR
CT=0
M1
G3
G4
RCO
CLK
ENP
ENT
3CT=MAX
1,5D
LOAD
C5/T,3,4+
QA
QB
QC
QD
CLR
A
B
C
D
CTR
CT=0
M1
G3
G4
RCO
CLK
ENP
ENT
3CT=MAX
1,5D
LSB
To More Significant Stages
Clear (L)
Count (H)
Disable (L)
Load (L)
Count (H)
Disable (L)
Clock
fmax = 1/(CLK to RCO tPLH) + (ENT to RCO tPLH) (N – 2) + (ENT tsu)
Figure 3. Carry Look-Ahead Circuit
LOAD
C5/T,3,4+
QA
QB
QC
QD
CLR
A
B
C
D
CTR
CT=0
M1
G3
G4
RCO
CLK
ENP
ENT
3CT=MAX
1,5D
LOAD
C5/T,3,4+
QA
QB
QC
QD
CLR
A
B
C
D
CTR
CT=0
M1
G3
G4
RCO
CLK
ENP
ENT
3CT=MAX
1,5D
LOAD
C5/T,3,4+
QA
QB
QC
QD
CLR
A
B
C
D
CTR
CT=0
M1
G3
G4
RCO
CLK
ENP
ENT
3CT=MAX
1,5D
LOAD
C5/T,3,4+
QA
QB
QC
QD
CLR
A
B
C
D
CTR
CT=0
M1
G3
G4
RCO
CLK
ENP
ENT
3CT=MAX
1,5D
LSB
To More Significant Stages
Clear (L)
Count (H)
Disable (L)
Load (L)
Clock
fmax = 1/(CLK to RCO tPLH) + (ENP tsu)
相關(guān)PDF資料
PDF描述
SN74AS161D AS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, PDSO16
SN74AS163NSR AS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, PDSO16
SN74AS162D AS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, PDSO16
SN74ALS162BD ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, PDSO16
SN74AS163DE4 AS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, PDSO16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SN54AS163J 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述:
SN54AS175AJ 制造商:Rochester Electronics LLC 功能描述:- Bulk
SN54AS241AJ 制造商:Texas Instruments 功能描述:Buffer/Line Driver 8-CH Non-Inverting 3-ST Bipolar 20-Pin CDIP Tube 制造商:Texas Instruments 功能描述:OCTAL BUFFER/DRIVER - Rail/Tube
SN54AS244AJ 制造商:Texas Instruments 功能描述:Buffer/Line Driver 8-CH Non-Inverting 3-ST Bipolar 20-Pin CDIP Tube
SN54AS245J 制造商:Texas Instruments 功能描述:OCTAL BUS TRANSCEIVER - Rail/Tube
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