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参数资料
| 型号： | SN54HC191FK |
| 厂商： | Texas Instruments, Inc. |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 300mA, 5.0V +/-1% Output Voltage, Low Dropout Voltage Regulator, Pb-Free Device; Package: 8 PIN DFN, 4x4; No of Pins: 8; Container: Tape and Reel; Qty per Container: 4000 |
| 中文描述： | 4位同步向上/向下二进制计数器 |
| 文件页数： | 1/10页 |
| 文件大小： | 156K |
| 代理商： | SN54HC191FK |
SN54HC191, SN74HC191
4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS
SCLS121B – DECEMBER 1982 – REVISED MAY 1997
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Single Down/Up Count-Control Line
Look-Ahead Circuitry Enhances Speed of
Cascaded Counters
Fully Synchronous in Count Modes
Asynchronously Presettable With Load
Control
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
The ’HC191 are 4-bit synchronous, reversible,
up/down binary counters. Synchronous counting
operation is provided by having all flip-flops
clocked simultaneously so that the outputs
change coincident with each other when
instructed by the steering logic. This mode of
operation eliminates the output counting spikes
normally associated with asynchronous (ripple-
clock) counters.
The outputs of the four flip-flops are triggered on
a low-to-high-level transition of the clock (CLK)
input if the count-enable (CTEN) input is low. A
high at CTEN inhibits counting. The direction of
the count is determined by the level of the
down/up (D/U) input. When D/U is low, the counter
counts up, and when D/U is high, it counts down.
These counters feature a fully independent clock circuit. Change at the control (CTEN and D/U) inputs that
modifies the operating mode have no effect on the contents of the counter until clocking occurs. The function
of the counter is dictated solely by the condition meeting the stable setup and hold times.
These counters are fully programmable; that is, each of the outputs can be preset to either level by placing a
low on the load (LOAD) input and entering the desired data at the data inputs. The output changes to agree with
the data inputs independently of the level of CLK. This feature allows the counters to be used as modulo-N
dividers by simply modifying the count length with the preset inputs.
Two outputs are available to perform the cascading function: ripple clock (RCO) and maximum/minimum
(MAX/MIN) count. MAX/MIN produces a high-level output pulse with a duration approximately equal to one
complete cycle of the clock while the count is zero (all outputs low) counting down, or maximum (9 or 15)
counting up. RCO produces a low-level output pulse under those same conditions, but only while CLK is low.
The counters can be easily cascaded by feeding RCO to CTEN of the succeeding counter if parallel clocking
is used, or to CLK if parallel enabling is used. MAX/MIN can be used to accomplish look ahead for high-speed
operation.
The SN54HC191 is characterized for operation over the full military temperature range of –55
°
C to 125
°
C. The
SN74HC191 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.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
B
Q
B
Q
A
CTEN
D/U
Q
C
Q
D
GND
V
CC
A
CLK
RCO
MAX/MIN
LOAD
C
D
SN54HC191 . . . J OR W PACKAGE
SN74HC191 . . . 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
CLK
RCO
NC
MAX/MIN
LOAD
Q
A
CTEN
NC
D/U
Q
C
Q
B
N
D
C
V
A
D
Q
G
N
SN54HC191 . . . FK PACKAGE
(TOP VIEW)
NC – No internal connection
B
C
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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|---|---|
| SN54HC191J | 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 制造商:Texas Instruments 功能描述:COUNTER SGL 4BIT ASYNC BINARY UP/DOWN 16CDIP - Rail/Tube |
| SN54HC193J | 制造商:Texas Instruments 功能描述:Counter Single 4-Bit Binary UP/Down 16-Pin CDIP Tube 制造商:Texas Instruments 功能描述:COUNTER SGL 4BIT BINARY UP/DOWN 16CDIP - Rail/Tube |
| SN54HC193W | 制造商:Texas Instruments 功能描述: |
| SN54HC194J | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| SN54HC195J | 制造商:Texas Instruments 功能描述:Shift Register Single 4-Bit Serial/Parallel to Parallel 16-Pin CDIP Tube 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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