參數(shù)資料
型號(hào)： SN54ALS162BJ
廠(chǎng)商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 計(jì)數(shù)器
英文描述： ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, CDIP16
封裝： CERAMIC, DIP-16
文件頁(yè)數(shù)： 4/25頁(yè)
文件大?。?/td> 430K
代理商： SN54ALS162BJ
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
SN54ALS161BFK ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, CQCC20
SN54ALS163BFK ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, CQCC20
SN54ALS243AJ ALS SERIES, 4-BIT TRANSCEIVER, TRUE OUTPUT, CDIP14
SN54ALS253J ALS SERIES, DUAL 4 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, CDIP16
SN54ALS323J ALS SERIES, 8-BIT BIDIRECTIONAL PARALLEL IN PARALLEL OUT SHIFT REGISTER, TRUE OUTPUT, CDIP20
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SN54ALS163BJ 制造商:Texas Instruments 功能描述:4-BIT SYNC BINARY COUNTER - Rail/Tube
SN54ALS169BJ 制造商:Texas Instruments 功能描述:Counter Single 4-Bit Sync Binary UP/Down 16-Pin CDIP Tube
SN54ALS174J 制造商:Texas Instruments 功能描述:
SN54ALS191AJ 制造商:Texas Instruments 功能描述:Counter Single 4-Bit Async Binary UP/Down 16-Pin CDIP Tube 制造商:Rochester Electronics LLC 功能描述:- Bulk
SN54ALS193AJ 制造商:Texas Instruments 功能描述:
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