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參數(shù)資料
| 型號(hào)： | SN54HC161W |
| 廠商： | Texas Instruments, Inc. |
| 元件分類(lèi)： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 300mA, 3.0V ±1% Output Voltage, Low Dropout Voltage Regulator; Package: SOIC-8 Narrow Body; No of Pins: 8; Container: Tape and Reel; Qty per Container: 2500 |
| 中文描述： | 4位同步二進(jìn)制計(jì)數(shù)器 |
| 文件頁(yè)數(shù)： | 1/14頁(yè) |
| 文件大?。?/td> | 202K |
| 代理商： | SN54HC161W |
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SN54HC161, SN74HC161
4-BIT SYNCHRONOUS BINARY COUNTERS
SCLS297A – JANUARY 1996 – REVISED MAY 1997
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Internal Look-Ahead for Fast Counting
Carry Output for n-Bit Cascading
Synchronous Counting
Synchronously Programmable
Package Options Include Plastic
Small-Outline (D) 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 ’HC161 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 ’HC161 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 output (RCO).
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.
The SN54HC161 is characterized for operation over the full military temperature range of –55
°
C to 125
°
C. The
SN74HC161 is characterized for operation from –40
°
C to 85
°
C.
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.
SN54HC161 . . . J OR W PACKAGE
SN74HC161 . . . D OR N PACKAGE
(TOP VIEW)
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
SN54HC161 . . . FK PACKAGE
(TOP VIEW)
C
C
N
L
E
R
E
G
N
V
C
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
NC – No internal connection
Copyright
1997, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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