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參數(shù)資料
| 型號： | SN54HC193FK |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | 4-BIT SYNCHRONOUS UP/DOWN COUNTERS DUAL CLOCK WITH CLEAR |
| 中文描述： | 4位同步向上/向下計數(shù)器雙時鐘清除 |
| 文件頁數(shù)： | 1/9頁 |
| 文件大小： | 143K |
| 代理商： | SN54HC193FK |
SN54HC193, SN74HC193
4-BIT SYNCHRONOUS UP/DOWN COUNTERS
(DUAL CLOCK WITH CLEAR)
SCLS122B – DECEMBER 1982 – REVISED MAY 1997
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Look-Ahead Circuitry Enhances Cascaded
Counters
Fully Synchronous in Count Modes
Parallel Asynchronous Load for Modulo-N
Count Lengths
Asynchronous Clear
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 ’HC193 are 4-bit synchronous, reversible,
up/down binary counters. Synchronous operation
is provided by having all flip-flops clocked
simultaneously so that the outputs change
coincidentally with each other when so 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 either count
(clock) input (UP or DOWN). The direction of
counting is determined by which count input is
pulsed while the other count input is high.
All four counters are fully programmable; that is, each output may 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 count pulses. This feature allows the counters to be used as modulo-N dividers
by simply modifying the count length with the preset inputs.
A clear (CLR) input has been provided that forces all outputs to the low level when a high level is applied. The
clear function is independent of the count and LOAD inputs.
These counters were designed to be cascaded without the need for external circuitry. The borrow (BO) output
produces a low-level pulse while the count is zero (all outputs low) and DOWN is low. Similarly, the carry (CO)
output produces a low-level pulse while the count is maximum (9 or 15) and UP is low. The counters can then
be easily cascaded by feeding BO and CO to DOWN and UP, respectively, of the succeeding counter.
The SN54HC193 is characterized for operation over the full military temperature range of –55
°
C to 125
°
C. The
SN74HC193 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.
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2
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4
5
6
7
8
16
15
14
13
12
11
10
9
B
Q
B
Q
A
DOWN
UP
Q
C
Q
D
GND
V
CC
A
CLR
BO
CO
LOAD
C
D
SN54HC193 . . . J OR W PACKAGE
SN74HC193 . . . 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
CLR
BO
NC
CO
LOAD
Q
A
DOWN
NC
UP
Q
C
Q
B
N
D
C
V
A
D
Q
G
N
SN54HC193 . . . 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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