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发布时间：2009-04-10 浏览：3751次
【Part No.】 74HC123D
【Category】 Dual retriggerable monostable multivibrator
【Package】 SOP-16
【MFQ】 PHILIP
【Datasheet】74HC123D Datasheet
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
· Output capability: standard (except
for nREXT/CEXT)
· ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT123 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.
The 74HC/HCT123 are dual retriggerable monostable multivibrators with output pulse width
control by three methods. The basic pulse time is programmed by selection of an external resistor
(REXT) and capacitor (CEXT). The external resistor and capacitor are normally connected as shown in
Fig.6.
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, nQ = LOW) can be made as long as desired.
Alternatively an output delay can be terminated at any time by a LOW-going edge on input nRD, 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. Figures 7 and 8
illustrate pulse control by retriggering
【Category】 Dual retriggerable monostable multivibrator
【Package】 SOP-16
【MFQ】 PHILIP
【Datasheet】74HC123D Datasheet
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
· Output capability: standard (except
for nREXT/CEXT)
· ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT123 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.
The 74HC/HCT123 are dual retriggerable monostable multivibrators with output pulse width
control by three methods. The basic pulse time is programmed by selection of an external resistor
(REXT) and capacitor (CEXT). The external resistor and capacitor are normally connected as shown in
Fig.6.
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, nQ = LOW) can be made as long as desired.
Alternatively an output delay can be terminated at any time by a LOW-going edge on input nRD, 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. Figures 7 and 8
illustrate pulse control by retriggering
Contact person:
Frances New
Phone:+86-755-81832961
Fax:+86-755-83299282
Email:sumzi@sumzi.com
MSN:sumzi-frances@msn.com
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