首页 > U74HC123L-S16-T

U74HC123L-S16-T

更新时间：2025-07-05 21:56:26
品牌：UTC
描述：DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR WITH RESET

PDF下载

中文翻译

免费 PCB/SMT

U74HC123L-S16-T 概述

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR WITH RESET

U74HC123L-S16-T 数据手册

通过下载U74HC123L-S16-T数据手册来全面了解它。这个PDF文档包含了所有必要的细节，如产品概述、功能特性、引脚定义、引脚排列图等信息。

PDF下载
UNISONIC TECHNOLOGIES CO., LTD  
U74HC123  
CMOS IC  
DUAL RETRIGGERABLE  
MONOSTABLE  
MULTIVIBRATOR WITH  
RESET  
SOP-16  
DESCRIPTION  
The U74HC123 is high-speed Si-gate CMOS device and is pin  
compatible with low power Schottky TTL (LSTTL).  
The U74HC123 is dual retriggerable monostable  
a
multivibrator with output pulse width control by three methods.  
The basic pulse time is programmed by selection of an external  
resistor (REXT) and capacitor (CEXT).  
TSSOP-16  
Once triggered, the basic output pulse width may be extended  
by retriggering the gated active LOW-going edge input( nA ) or  
the active HIGH-going edge input (nB). By repeating this process,  
the output pulse period (nQ=HIGH, n Q =LOW) can be made as long as desired. Alternatively an output delay can be  
terminated at any time by a LOW-going edge on inputnRD , which also inhibits the triggering.  
An internal connection from nRD to the input gates makes it possible to trigger the circuit by a positive-going  
signal at input nRD as shown in the function table. The basic output pulse width is essentially determined by the  
values of the external timing components REXT and CEXT  
Schmitt-trigger action in the nA and nB inputs, makes the circuit highly tolerant to slower input rise and fall  
times.  
.
FEATURES  
* DC triggered from active HIGH or active LOW inputs  
* Retriggerable for very long pulses up to 100% duty factor  
* Direct reset terminates output pulse  
* Schmitt-trigger action on all inputs except for the reset input  
ORDERING INFORMATION  
Ordering Number  
Lead Free  
Package  
Packing  
Halogen Free  
U74HC123L-S16-R  
U74HC123L-S16-T  
U74HC123L-P16-R  
U74HC123L-P16-T  
U74HC123G-S16-R  
U74HC123G-S16-T  
U74HC123G-P16-R  
U74HC123G-P16-T  
SOP-16  
SOP-16  
Tape Reel  
Tube  
TSSOP-16  
TSSOP-16  
Tape Reel  
Tube  
www.unisonic.com.tw  
Copyright © 2013 Unisonic Technologies Co., Ltd  
1 of 10  
QW-R502-A10.A  
U74HC123  
PIN CONFIGURATION  
CMOS IC  
FUNCTION TABLE  
INPUTS  
OUTPUTS  
nB  
nQ  
nRD  
L
nQ  
H
nA  
X
X
X
L
L
X
H
L(2)  
L(2)  
H(2)  
H(2)  
X
X
H
H
↑
L
↓
L
↑
H
H
Note: 1. H: HIGH voltage level L: LOW voltage level X: don’care ↑: LOW-to-HIGH transition  
↓: HIGH-to-LOW transition : one HIGH level output pulse : one LOW level output pulse  
2. If the monostable was triggered before this condition was established, the pulse will continue as  
programmed.  
UNISONIC TECHNOLOGIES CO., LTD  
2 of 10  
QW-R502-A10.A  
www.unisonic.com.tw  
U74HC123  
CMOS IC  
LOGIC SYMBOL  
UNISONIC TECHNOLOGIES CO., LTD  
3 of 10  
QW-R502-A10.A  
www.unisonic.com.tw  
U74HC123  
CMOS IC  
LOGIC DIAGRAM  
UNISONIC TECHNOLOGIES CO., LTD  
4 of 10  
QW-R502-A10.A  
www.unisonic.com.tw  
U74HC123  
CMOS IC  
ABSOLUTE MAXIMUM RATING  
PARAMETER  
SYMBOL  
VCC  
RATINGS  
-0.5 ~ 7  
±50  
UNIT  
V
Supply Voltage  
VCC or GND Current  
Output Current  
ICC  
mA  
mA  
mA  
mA  
°C  
IOUT  
IIK  
±25  
Input Clamp Current  
Output Clamp Current  
Storage Temperature  
±20  
IOK  
±20  
TSTG  
-65 ~ + 150  
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.  
Absolute maximum ratings are stress ratings only and functional device operation is not implied.  
RECOMMENDED OPERATING CONDITIONS  
PARAMETER  
SYMBOL  
VCC  
TEST CONDITIONS  
MIN TYP MAX UNIT  
Supply Voltage  
2
5
6
V
VCC=2V  
1.5  
1.2  
High-level Input Voltage  
VIH  
VIL  
VCC=4.5V  
VCC=6V  
VCC=2V  
VCC=4.5V  
VCC=6V  
3.15 2.4  
V
4.2  
3.2  
0.8  
0.5  
Low-level Input Voltage  
2.1 1.35  
V
2.8  
1.8  
VCC  
VCC  
1000  
500  
400  
Input Voltage  
VIN  
0
0
V
V
Output Voltage  
VOUT  
VCC=2V  
VCC=4.5V  
VCC=6V  
Input Transition Rise and Fall Rate  
nRD Input  
△t/△V  
ns  
-40  
+25 +125 °C  
Ambient Temperature  
Tamb  
ELECTRICAL CHARACTERISTICS (TA =25°C , unless otherwise specified)  
PARAMETER  
SYMBOL  
VOH  
TEST CONDITIONS  
VCC=2V, IOH=-20μA  
MIN TYP MAX UNIT  
1.9  
4.4  
5.9  
2
4.5  
6
VCC=4.5V, IOH=-20μA  
VCC=6V, IOH=-20μA  
VCC=4.5V, IOH=-4mA  
VCC=6V, IOH=-5.2mA  
VCC=2V, IOL=20μA  
VCC=4.5V, IOL=20μA  
VCC=6V, IOL=20μA  
VCC=4.5V, IOL=4mA  
VCC=6V, IOL=5.2mA  
Output Voltage High-Level  
Output Voltage Low-Level  
V
V
3.98 4.32  
5.48 5.81  
0
0
0
0.1  
0.1  
0.1  
VOL  
0.15 0.26  
0.16 0.26  
V
CC=6V, VIN= VCC or GND  
±0.1  
μA  
μA  
pF  
Input Leakage Current  
Quiescent Supply Current  
Input Capacitance  
II(LEAK)  
ICC  
VCC=6V, VIN=VCC or GND, IOUT=0  
8
3.5  
CI  
UNISONIC TECHNOLOGIES CO., LTD  
5 of 10  
QW-R502-A10.A  
www.unisonic.com.tw  
U74HC123  
CMOS IC  
SWITCHING CHARACTERISTICS (tr = tf = 6ns, CL=50pF, TA =25°C, unless otherwise specified)  
PARAMETER  
SYMBOL  
TEST CONDITIONS  
CC=2V  
MIN TYP MAX UNIT  
V
83  
30  
26  
24  
66  
24  
20  
19  
19  
7
255  
51  
Propagation Delay Time From nA , nB  
to nQ or nQ  
VCC=4.5V  
CEXT=0pF  
EXT=5k  
t
t
PLH/tPHL  
ns  
ns  
R
VCC=5V, CL=15p  
VCC=6V  
43  
215  
43  
VCC=2V  
Propagation Delay Time From nRD to  
nQ or nQ  
VCC=4.5V  
VCC=5V, CL=15p  
VCC=6V  
CEXT=0pF  
EXT=5k  
PLH/tPHL  
R
37  
75  
15  
13  
VCC=2V  
Output transition time  
tt  
VCC=4.5V  
VCC=6V  
ns  
ns  
ns  
ns  
μs  
ns  
ns  
6
VCC=2V  
100  
20  
8
tw  
tw  
tw  
tw  
tw  
trt  
VCC=4.5V  
VCC=6V  
3
Trigger pulse width nA =LOW  
Trigger pulse width nB=HIGH  
17  
2
VCC=2V  
100  
20  
17  
6
VCC=4.5V  
VCC=6V  
17  
5
VCC=2V  
100  
20  
14  
5
VCC=4.5V  
VCC=6V  
Reset pulse width nRD =LOW  
17  
4
Output pulse width  
VCC=5V , CEXT=100nF, REXT=10k  
VCC=5V , CEXT=0pF, REXT=5k  
VCC=5V , CEXT=0pF, REXT=5k  
450  
75  
nQ=HIGH, nQ =LOW  
Output pulse width  
nQ=HIGH, nQ =LOW  
110  
Retrigger time nA , nB  
VCC=2V  
VCC=5V  
VCC=5V  
10  
2
1000 kΩ  
1000  
External timing resistor  
External timing capacitor  
REXT  
CEXT  
2
10000 pF  
OPERATING CHARACTERISTICS (TA =25°C , unless otherwise specified)  
PARAMETER  
SYMBOL  
CPD  
TEST CONDITIONS  
MIN TYP MAX UNIT  
Power Dissipation Capacitance Per  
monostable  
54  
pF  
UNISONIC TECHNOLOGIES CO., LTD  
6 of 10  
QW-R502-A10.A  
www.unisonic.com.tw  
U74HC123  
CMOS IC  
TEST CIRCUIT AND WAVEFORMS  
UNISONIC TECHNOLOGIES CO., LTD  
7 of 10  
QW-R502-A10.A  
www.unisonic.com.tw  
U74HC123  
CMOS IC  
TEST CIRCUIT AND WAVEFORMS(Cont.)  
UNISONIC TECHNOLOGIES CO., LTD  
8 of 10  
QW-R502-A10.A  
www.unisonic.com.tw  
U74HC123  
CMOS IC  
APPLICATION INFORMATION  
Timing component connections  
The basic output pulse width is essentially determined by the values of the external timing components REXT and  
CEXT  
.
Power-up considerations  
When the monostable is powered-up it may produce an output pulse, with a pulse width defined by the values of  
REXT and CEXT, this output can be eliminated using the circuit below.  
UNISONIC TECHNOLOGIES CO., LTD  
9 of 10  
QW-R502-A10.A  
www.unisonic.com.tw  
U74HC123  
CMOS IC  
APPLICATION INFORMATION(Cont.)  
Power-down considerations  
A large capacitor (CEXT) may cause problems when powering-down the monostable due to the energy stored in  
this capacitor. When a system containing this device is powered-down or a rapid decrease of VCC to zero occurs, the  
monostable may substain damage, due to the capacitor discharging through the input protection diodes. To avoid  
this possibility, use a damping diode (DEXT) preferably a germanium or Schottky type diode able to withstand large  
current surges and connect as shown below.  
UTC assumes no responsibility for equipment failures that result from using products at values that  
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or  
other parameters) listed in products specifications of any and all UTC products described or contained  
herein. UTC products are not designed for use in life support appliances, devices or systems where  
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in  
whole or in part is prohibited without the prior written consent of the copyright owner. The information  
presented in this document does not form part of any quotation or contract, is believed to be accurate  
and reliable and may be changed without notice.  
UNISONIC TECHNOLOGIES CO., LTD  
10 of 10  
QW-R502-A10.A  
www.unisonic.com.tw  

U74HC123L-S16-T 相关器件

型号 制造商 描述 价格 文档
U74HC123_15 UTC DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR 获取价格
U74HC138 UTC 3-TO-8 LINE DECODERS / DEMULTIPLEXERS 获取价格
U74HC138G-D16-T UTC Multiplexer And Demux/Decoder, HC/UH Series, 1-Func, 3 Line Input, 8 Line Output, Inverted Output, CMOS, PDIP16, DIP-16 获取价格
U74HC138G-P16-R UTC Multiplexer And Demux/Decoder, HC/UH Series, 1-Func, 3 Line Input, 8 Line Output, Inverted Output, CMOS, PDSO16, TSSOP-16 获取价格
U74HC138G-P16-T UTC 3-TO-8 LINE DECODERS / DEMULTIPLEXERS 获取价格
U74HC138G-R16-R UTC 3-TO-8 LINE DECODERS / DEMULTIPLEXERS 获取价格
U74HC138G-R16-T UTC Multiplexer And Demux/Decoder, HC/UH Series, 1-Func, 3 Line Input, 8 Line Output, Inverted Output, CMOS, PDSO16, SSOP-16 获取价格
U74HC138G-S16-R UTC Multiplexer And Demux/Decoder, HC/UH Series, 1-Func, 3 Line Input, 8 Line Output, Inverted Output, CMOS, PDSO16, SOP-16 获取价格
U74HC138G-S16-T UTC Multiplexer And Demux/Decoder, HC/UH Series, 1-Func, 3 Line Input, 8 Line Output, Inverted Output, CMOS, PDSO16, HALOGEN FREE, SOP-16 获取价格
U74HC138L-D16-T UTC Multiplexer And Demux/Decoder, HC/UH Series, 1-Func, 3 Line Input, 8 Line Output, Inverted Output, CMOS, PDIP16, DIP-16 获取价格

U74HC123L-S16-T 相关文章

  • 杰理 JL7096D 芯片加持，vivo 半入耳耳机成降噪新标杆之作
    2025-07-08
    86
  • 2026 年 ASIC 或逆袭 GPU，定制化算力竞赛进入决胜阶段
    2025-07-08
    18
  • Buck 电路空载电感发热：原因探究与解决方案
    2025-07-08
    25
  • HBM 技术爆炸式增长，助力 AI 计算迈向新高度
    2025-07-08
    16

    • 热门型号

  • 1N5930
  • 1N5942B
  • 1N4001
  • MBR3050CT
  • RTA02-8D
  • 4116T
  • 5KP43A/4
  • 1N5260A
  • MC79L05
  • BZX85C30
  • 9510-G
  • W2PE-54WZ-P
  • 1N6063
  • 2SA673
  • 20IMX35
    • Hi,有什么可以帮您？ 在线客服 或 微信扫码咨询
  • 概述
  • 数据手册
    • 2025 ICPDF网 联系我们和版权申明:QQ 272164286