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參數(shù)資料
| 型號： | SN74AHCT161 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | 4-Bit Synchronous Binary Counters(4位二進制同步計數(shù)器) |
| 中文描述： | 4位同步二進制計數(shù)器（4位二進制同步計數(shù)器） |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 224K |
| 代理商： | SN74AHCT161 |
SN54AHCT161, SN74AHCT161
4-BIT SYNCHRONOUS BINARY COUNTERS
SCLS368A – MAY 1997 – REVISED JUNE 1997
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Inputs Are TTL-Voltage Compatible
EPIC
(Enhanced-Performance Implanted
CMOS) Process
Internal Look-Ahead for Fast Counting
Carry Output for n-Bit Cascading
Synchronous Counting
Synchronously Programmable
Package Options Include Plastic
Small-Outline (D), Shrink Small-Outline
(DB), Thin Shrink Small-Outline (PW), and
Ceramic Flat (W) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
description
These synchronous, presettable counters feature
an internal carry look-ahead for application in
high-speed counting designs. The ’AHCT161 are
4-bit binary counters. Synchronous operation is
provided by having all flip-flops clocked
simultaneously so that the outputs change
coincident with each other when so instructed by
the count-enable (ENP, ENT) inputs and internal
gating. This mode of operation eliminates the
output counting spikes that are normally
associated with synchronous (ripple-clock)
counters. A buffered clock (CLK) input triggers the
four flip-flops on the rising (positive-going) edge of
the clock waveform.
These counters are fully programmable; that is, they can be preset to any number between 0 and 9 or 15. As
presetting is synchronous, setting up a low level at the load input disables the counter and causes the outputs
to agree with the setup data after the next clock pulse, regardless of the levels of the enable inputs.
The clear function for the ’AHCT161 is asynchronous. A low level at the clear (CLR) input sets all four of the
flip-flop outputs low, regardless of the levels of the CLK, load (LOAD), or enable inputs.
The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without
additional gating. Instrumental in accomplishing this function are ENP, ENT, and a ripple-carry (RCO) output.
Both ENP and ENT must be high to count, and ENT is fed forward to enable RCO. Enabling RCO produces a
high-level pulse while the count is maximum (9 or 15 with Q
A
high). This 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.
P
Copyright
1997, Texas Instruments Incorporated
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC is a trademark of Texas Instruments Incorporated.
SN54AHCT161 . . . J OR W PACKAGE
SN74AHCT161 . . . D, DB, N, OR PW PACKAGE
(TOP VIEW)
SN54AHCT161 . . . FK PACKAGE
(TOP VIEW)
NC – No internal connection
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CLR
CLK
A
B
C
D
ENP
GND
V
CC
RCO
Q
A
Q
B
Q
C
Q
D
ENT
LOAD
3
2
1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
Q
A
Q
B
NC
Q
C
Q
D
A
B
NC
C
D
C
C
N
L
E
R
E
G
N
V
C
相關PDF資料 |
PDF描述 |
|---|---|
| SN54AHCT16240WD | 16-BIT BUFFERS/DRIVERS WITH 3-STATE OUTPUTS |
| SN74AHCT16240DGG | 16-BIT BUFFERS/DRIVERS WITH 3-STATE OUTPUTS |
| SN74AHCT16240DGV | 16-BIT BUFFERS/DRIVERS WITH 3-STATE OUTPUTS |
| SN54AHCT16240 | 16-Bit Buffers/Line Drivers With 3-State Outputs(16位緩沖器/驅動器(三態(tài)輸出)) |
| SN54AHCT16244 | 16-Bit Buffers/Line Drivers With 3-State Outputs(16位緩沖器/驅動器(三態(tài)輸出)) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SN74AHCT16240DGGR | 功能描述:緩沖器和線路驅動器 16bit RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| SN74AHCT16240DGVR | 功能描述:緩沖器和線路驅動器 16bit RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| SN74AHCT16240DL | 功能描述:緩沖器和線路驅動器 16bit RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| SN74AHCT16240DLG4 | 功能描述:緩沖器和線路驅動器 16-Bit Buffer/Driver With 3-State Outputs RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| SN74AHCT16240DLR | 功能描述:緩沖器和線路驅動器 16-Bit Buffer/Driver With 3-State Outputs RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
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