參數(shù)資料
型號： SNJ54ALS161BJ
廠商： TEXAS INSTRUMENTS INC
元件分類： 計(jì)數(shù)器
英文描述： ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, CDIP16
封裝： CERAMIC, DIP-16
文件頁數(shù)： 4/26頁
文件大小： 815K
代理商： SNJ54ALS161BJ
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)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SNJ54ALS161BW 制造商:TI 制造商全稱:Texas Instruments 功能描述:SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SNJ54ALS162BFK 制造商:Rochester Electronics LLC 功能描述:- Bulk
SNJ54ALS163BFK 制造商:TI 制造商全稱:Texas Instruments 功能描述:SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SNJ54ALS163BJ 制造商:Rochester Electronics LLC 功能描述:8302202EA, SYNC 4-BIT BINARY COUNTER - Bulk 制造商:Texas Instruments 功能描述: 制造商:Texas Instruments 功能描述:Counter Single 4-Bit Sync Binary UP 16-Pin CDIP Tube
SNJ54ALS165J 制造商:Texas Instruments 功能描述:Shift Register Single 8-Bit Serial/Parallel to Serial 16-Pin CDIP 制造商:Rochester Electronics LLC 功能描述:- Bulk
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