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M74HC123B1R データシート(PDF) 1 Page - STMicroelectronics

部品番号 M74HC123B1R
部品情報  DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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July 2001
s
HIGH SPEED :
tPD = 23 ns (TYP.) at VCC = 6V
s
LOW POWER DISSIPATION:
STAND BY STATE :
ICC=4µA (MAX.) at TA=25°C
ACTIVE STATE :
ICC=200µA (MAX.) at VCC = 5V
s
HIGH NOISE IMMUNITY:
VNIH = VNIL = 28 % VCC (MIN.)
s
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 4mA (MIN)
s
BALANCED PROPAGATION DELAYS:
tPLH tPHL
s
WIDE OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V to 6V
s
WIDE OUTPUT PULSE WIDTH RANGE :
tWOUT = 120 ns ~ 60 s OVER AT VCC = 4.5 V
s
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 123
DESCRIPTION
The
M74HC123
is
an
high
speed
CMOS
MONOSTABLE MULTIVIBRATOR fabricated with
silicon gate C2MOS technology.
There are two trigger inputs, A INPUT (negative
edge) and B INPUT (positive edge). These inputs
are valid for slow rising/falling signals, (tr=tf=l sec).
The device may also be triggered by using the
CLR
input
(positive-edge)
because
of
the
Schmitt-trigger input; after triggering the output
maintains the MONOSTABLE state for the time
period determined by the external resistor Rx and
capacitor Cx. When Cx > 10nF and Rx > 10K
Ω,
the output pulse width value is approsimatively
given by the formula : tW(OUT) = K · Cx · Rx.
(K
0.45).
Taking CLR low breaks this MONOSTABLE
STATE. If the next trigger pulse occurs during the
MONOSTABLE
period
it
makes
the
MONOSTABLE period longer. Limit for values of
Cx and Rx : Cx : NO LIMIT
Rx : Vcc < 3.0V 5KΩ to 1MΩ
Vcc > 3.0V 1KΩ to 1MΩ
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
M74HC123
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
PACKAGE
TUBE
T & R
DIP
M74HC123B1R
SOP
M74HC123M1R
M74HC123RM13TR
TSSOP
M74HC123TTR
TSSOP
DIP
SOP


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