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参数资料
| 型号： | 74AHC123A |
| 厂商： | NXP Semiconductors N.V. |
| 英文描述： | Dual retriggerable monostable multivibrator with reset |
| 中文描述： | 双retriggerable单稳态触发器的复位 |
| 文件页数： | 2/24页 |
| 文件大小： | 111K |
| 代理商： | 74AHC123A |
2000 Mar 15
2
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator
with reset
74AHC123A;
74AHCT123A
FEATURES
ESD protection:
HBM EIA/JESD22-A114-A exceeds 2000 V
MM EIA/JESD22-A115-A exceeds 200 V
CDM EIA/JESD22-C101 exceeds 1000 V
All inputs have Schmitt-trigger actions
Inputs accept voltages higher than V
CC
For AHC only: operates with CMOS input levels
For AHCT only: operates with TTL input levels
Specified from
40 to +85
°
C and
40 to +125
°
C
DC triggered from active HIGH or active LOW inputs
Retriggerable for very long pulses up to 100% duty
factor
Direct reset terminates output pulse
Output capability: standard (except for nR
EXT
/C
EXT
).
DESCRIPTION
The 74AHC/AHCT123A are high-speed Si-gate CMOS
devices and are pin compatible with Low power Schottky
TTL (LSTTL). They are specified in compliance with
JEDEC standard no.7A.
The74AHC/AHCT123Aaredualretriggerablemonostable
multivibrators with output pulse width control by three
methods. The basic pulse time is programmed by
selection of an external resistor (R
EXT
) and capacitor
(C
EXT
). The external resistor and capacitor are normally
connected as shown in Fig.6.
Once triggered, the basic output pulse width may be
extendedbyretriggeringthegatedactiveLOW-goingedge
input (nA) or the active HIGH-going edge input (nB).
By repeating this process, the output pulse period
(nQ = HIGH, nQ = LOW) can be made as long as desired.
Alternativelyanoutputdelaycanbeterminatedat anytime
by a LOW-going edge on input nR
D
, which also inhibits the
triggering.
An internal connection from nR
D
to the input gate makes it
possible to trigger the circuit by a positive-going signal at
input nR
D
as shown in the function table. Figs 8 and 9
illustrate pulse control by retriggering and early reset. The
basic output pulse width is essentially determined by the
value of the external timing components R
EXT
and C
EXT
.
When C
EXT
≥
10 nF, the typical output pulse width is
defined as: t
W
= R
EXT
×
C
EXT
where t
W
= pulse width in ns;
R
EXT
= external resistor in k
; C
EXT
= external capacitor
in pF. Schmitt-trigger action at all inputs makes the circuit
highly tolerant to slower input rise and fall times. The ‘123’
is identical to the ‘423’ but can be triggered via the reset
input.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 74AHC123ABQ | 制造商:NXP Semiconductors 功能描述:IC DUAL RETRIG MULTIVIB DHV |
| 74AHC123ABQ,115 | 功能描述:单稳态多谐振荡器 5V 2 RETRIG RoHS:否 制造商:Texas Instruments 每芯片元件:1 逻辑系列:LVC 逻辑类型:Monostable Multivibrator 封装 / 箱体:SSOP-8 传播延迟时间:18.6 ns 高电平输出电流:- 32 mA 低电平输出电流:32 mA 电源电压-最大:5.5 V 电源电压-最小:1.65 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Reel |
| 74AHC123ABQ115 | 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
| 74AHC123ABQ-G | 功能描述:单稳态多谐振荡器 5V 2 RETRIG MONOSTABLE MULTIVI RoHS:否 制造商:Texas Instruments 每芯片元件:1 逻辑系列:LVC 逻辑类型:Monostable Multivibrator 封装 / 箱体:SSOP-8 传播延迟时间:18.6 ns 高电平输出电流:- 32 mA 低电平输出电流:32 mA 电源电压-最大:5.5 V 电源电压-最小:1.65 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Reel |
| 74AHC123ABQ-Q100 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Dual retriggerable monostable multivibrator with reset |
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