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| 型号： | SN74ALS193ANSRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 计数器 |
| 英文描述： | ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16 |
| 封装： | GREEN, PLASTIC, SOP-16 |
| 文件页数： | 1/19页 |
| 文件大小： | 726K |
| 代理商： | SN74ALS193ANSRG4 |
SN54ALS193A, SN74ALS193A
SYNCHRONOUS 4BIT UP/DOWN BINARY COUNTERS
WITH DUAL CLOCK AND CLEAR
SDAS211C DECEMBER 1982 REVISED JULY 1996
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
D Look-Ahead Circuitry Enhances Cascaded
Counters
D Fully Synchronous in Count Modes
D Parallel Asynchronous Load for Modulo-N
Count Lengths
D Asynchronous Clear
D Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
description
The ’ALS193A are synchronous, reversible, 4-bit
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 either count/clock
(UP or DOWN) input. The direction of the count 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 high level applied to the clear (CLR) input forces all outputs to the low level. The clear function is independent
of the count and LOAD inputs. The UP, DOWN, and LOAD inputs are buffered to lower the drive requirement,
which significantly reduces the loading on, or current required by, clock drivers, etc., for long parallel words.
These counters are 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 Q outputs low) and the DOWN input is low. Similarily, the
carry (CO) output produces a low-level pulse while the count is 9 or 15 (all Q outputs high) and the UP input
is low. The counters can then be easily cascaded by feeding BO and CO to the count-down and count-up inputs,
respectively, of the succeeding counter.
The SN54ALS193A is characterized for operation over the full military temperature range of 55
°C to 125°C.
The SN74ALS193A is characterized for operation from 0
°C to 70°C.
Copyright
1996, 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.
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
QB
QA
DOWN
UP
QC
QD
GND
VCC
A
CLR
BO
CO
LOAD
C
D
SN54ALS193A ...J PACKAGE
SN74ALS193A ...D OR N PACKAGE
(TOP VIEW)
SN54ALS193A . . . FK PACKAGE
(TOP VIEW)
32 1 20 19
910 11 12 13
4
5
6
7
8
18
17
16
15
14
CLR
BO
NC
CO
LOAD
QA
DOWN
NC
UP
QC
B
NC
D
C
A
Q
GND
NC
D
Q
B
V
CC
NC No internal connection
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| SN74ALS240A-1DWRE4 | ALS SERIES, DUAL 4-BIT DRIVER, INVERTED OUTPUT, PDSO20 |
| SN74ALS240ADBR | ALS SERIES, DUAL 4-BIT DRIVER, INVERTED OUTPUT, PDSO20 |
| SN74AS240ANSRE4 | AS SERIES, DUAL 4-BIT DRIVER, INVERTED OUTPUT, PDSO20 |
| SN74ALS240A-1DWR | ALS SERIES, DUAL 4-BIT DRIVER, INVERTED OUTPUT, PDSO20 |
| SN74ALS240ADW | ALS SERIES, DUAL 4-BIT DRIVER, INVERTED OUTPUT, PDSO20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SN74ALS193N | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| SN74ALS20AD | 功能描述:逻辑门 Dual 4 Input RoHS:否 制造商:Texas Instruments 产品:OR 逻辑系列:LVC 栅极数量:2 线路数量（输入/输出）:2 / 1 高电平输出电流:- 16 mA 低电平输出电流:16 mA 传播延迟时间:3.8 ns 电源电压-最大:5.5 V 电源电压-最小:1.65 V 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:DCU-8 封装:Reel |
| SN74ALS20ADBR | 功能描述:逻辑门 Dual 4-Input Positive-NAND gates RoHS:否 制造商:Texas Instruments 产品:OR 逻辑系列:LVC 栅极数量:2 线路数量（输入/输出）:2 / 1 高电平输出电流:- 16 mA 低电平输出电流:16 mA 传播延迟时间:3.8 ns 电源电压-最大:5.5 V 电源电压-最小:1.65 V 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:DCU-8 封装:Reel |
| SN74ALS20ADBRE4 | 功能描述:逻辑门 Dual 4-Input Positive-NAND gates RoHS:否 制造商:Texas Instruments 产品:OR 逻辑系列:LVC 栅极数量:2 线路数量（输入/输出）:2 / 1 高电平输出电流:- 16 mA 低电平输出电流:16 mA 传播延迟时间:3.8 ns 电源电压-最大:5.5 V 电源电压-最小:1.65 V 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:DCU-8 封装:Reel |
| SN74ALS20ADBRG4 | 功能描述:逻辑门 Dual 4 Input Pos NAND Gates RoHS:否 制造商:Texas Instruments 产品:OR 逻辑系列:LVC 栅极数量:2 线路数量（输入/输出）:2 / 1 高电平输出电流:- 16 mA 低电平输出电流:16 mA 传播延迟时间:3.8 ns 电源电压-最大:5.5 V 电源电压-最小:1.65 V 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:DCU-8 封装:Reel |
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