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参数资料
| 型号： | SN74LS490D |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 计数器 |
| 英文描述： | LS SERIES, ASYN NEGATIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, PDSO16 |
| 封装： | PLASTIC, SO-16 |
| 文件页数： | 1/9页 |
| 文件大小： | 147K |
| 代理商： | SN74LS490D |
SN54LS490, SN74LS490
DUAL 4-BIT DECADE COUNTERS
SDLS125A – OCTOBER 1976 – REVISED JULY 1998
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D Dual Versions of the SN54LS90 and
SN74LS90 Counters
D Individual Clock, Direct Clear, and Set-to-9
Inputs for Each Decade Counter
D Dual Counters Can Significantly Improve
System Densities as Package Count Can
Be Reduced by 50%
D Maximum Count Frequency of
25 MHz . . . 35 MHz Typical
D Buffered Outputs Reduce Possibility of
Collector Commutation
D Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Flat
(W) Packages, Ceramic Chip Carriers (FK),
and Standard Plastic (N) and Ceramic (J)
DIPs
description
Each of these monolithic circuits contains eight
master-slave flip-flops and additional gating to
implement two individual 4-bit decade counters in
a single package. Each decade counter has
individual clock (1CLK, 2CLK), clear (1CLR,
2CLR), and set-to-9 (1SET9, 2SET9) inputs. BCD
count
sequences
of
any
length
up
to
divide-by-100 can be implemented with a single
’LS490 device. Buffering on each output is
provided to significantly reduce susceptibility to
collector commutation. All inputs are diode
clamped to reduce the effects of line ringing. The
counters have parallel outputs from each counter
stage so that submultiples of the input count
frequency are available for system timing signals.
The SN54LS490 is characterized for operation over the full military temperature range of –55
°C to 125°C.
The SN74LS490 is characterized for use in industrial systems operating from 0
°C to 70°C.
CLEAR/SET-TO-9 FUNCTION TABLE
(each counter)
INPUTS
OUTPUTS
CLR
SET9
QA
QB
QC
QD
H
L
HH
LL
H
L
Count
Copyright
1998, 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
1CLK
1CLR
1QA
1SET9
1QB
1QC
1QD
GND
VCC
2CLK
2CLR
2QA
2SET9
2QB
2QC
2QD
SN54LS490 ...J OR W PACKAGE
SN74LS490 ...D OR N PACKAGE
(TOP VIEW)
32
1 20 19
910 11 12 13
4
5
6
7
8
18
17
16
15
14
2CLR
2QA
NC
2SET9
2QB
1QA
1SET9
NC
1QB
1QC
SN54LS490 . . . FK PACKAGE
(TOP VIEW)
1CLR
1CLK
NC
2CLK
D
GND
NC
CC
V
NC – No internal connection
1Q
D
2Q
C
2Q
相关PDF资料 |
PDF描述 |
|---|---|
| SN54LS490FK | LS SERIES, ASYN NEGATIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, CQCC20 |
| SN54LS498L883B | PARALLEL IN PARALLEL OUT SHIFT REGISTER, MQCC28 |
| SN54LS498JS883B | PARALLEL IN PARALLEL OUT SHIFT REGISTER, CDIP24 |
| SN54LS498JS | PARALLEL IN PARALLEL OUT SHIFT REGISTER, CDIP24 |
| SN74LS498JS | PARALLEL IN PARALLEL OUT SHIFT REGISTER, CDIP24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SN74LS490N | 制造商:Motorola Inc 功能描述: 制造商:Panasonic Industrial Company 功能描述:IC 制造商:Rochester Electronics LLC 功能描述: |
| SN74LS4N | 制造商:Motorola Inc 功能描述: |
| SN74LS508N | 制造商:Texas Instruments 功能描述: |
| SN74LS51D | 功能描述:逻辑门 AND-OR-Invert Gate 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 |
| SN74LS51DE4 | 功能描述:逻辑门 AND-OR-Invert Gate 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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