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74LV123DPHI优惠N/a37500avaiDual retriggerable monostable multivibrator with reset
74LV123DPHIN/a940avaiDual retriggerable monostable multivibrator with reset
74LV123DBPHILIPS原N/a2000avaiDual retriggerable monostable multivibrator with reset
74LV123PWPHILN/a10000avaiDual retriggerable monostable multivibrator with reset


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74LV123D-74LV123DB-74LV123PW
Dual retriggerable monostable multivibrator with reset
Product specification
Supersedes data of 1997 Feb 04
IC24 Data Handbook
1998 Apr 20
Philips Semiconductors Product specification
74LV123Dual retriggerable monostable multivibrator
with reset
FEATURES
Optimized for Low Voltage applications: 1.0 to 5.5V Accepts TTL input levels between VCC = 2.7V and VCC = 3.6V Typical VOLP (output ground bounce)  0.8V @ VCC = 3.3V,
Tamb = 25°C Typical VOHV (output VOH undershoot)  2V @ VCC = 3.3V,
Tamb = 25°C DC triggered from active HIGH or active LOW inputs Retriggerable for very long pulses up to 100% duty factor Direct reset terminates output pulses Schmitt-trigger action on all inputs except for the reset input Output capability: standard (except for nREXT/CEXT) ICC category: MSI
DESCRIPTION

The 74LV123 is a low-voltage Si-gate CMOS device and is pin and
function compatible with the 74HC/HCT123.
The 74LV123 is a dual retriggerable monostable 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). They are normally connected as shown in
Figure 1. 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. Figures 1 and 2 illustrate pulse control by
retriggering and early reset. The basic output pulse width is
essentially determined by the values of the external timing
components REXT and CEXT. For pulse width when CEXT <10000pF,
see Figure 5. When CEXT  10,000pF, the typical output pulse
width is defined as: tW = 0.45  REXT  CEXT (typ.), where= pulse width in ns; REXT = external resistor in KΩ; and
CEXT= external capacitor in pF. Schmitt-trigger action in the nA and
nB inputs makes the circuit highly tolerant of slower input rise and
fall times.
QUICK REFERENCE DATA

GND = 0V; Tamb = 25°C; tr = tf 2.5 ns
NOTES:
CPD is used to determine the dynamic power dissipation (PD in μW)
PD = CPD  VCC2  fi  (CL  VCC2  fo) where:
fi = input frequency in MHz; CL = output load capacitance in pF;
fo = output frequency in MHz; VCC = supply voltage in V;
 (CL  VCC 2  fo) = sum of the outputs.
ORDERING INFORMATION
Philips Semiconductors Product specification
74LV123Dual retriggerable monostable multivibrator
with reset
PIN CONFIGURATION
PIN DESCRIPTION
LOGIC SYMBOL (IEEE/IEC)
LOGIC SYMBOL
FUNCTIONAL DIAGRAM
Philips Semiconductors Product specification
74LV123Dual retriggerable monostable multivibrator
with reset
LOGIC DIAGRAM
FUNCTION TABLE
NOTES:
If the monostable was triggered before this condition was
established, the pulse will continue as programmed.
H = HIGH voltage level
L = LOW voltage level
X = don’t care
↑ = LOW-to-HIGH transition
Philips Semiconductors Product specification
74LV123Dual retriggerable monostable multivibrator
with reset
RECOMMENDED OPERATING CONDITIONS
NOTE:
The LV is guaranteed to function down to VCC = 1.0V (input levels GND or VCC); DC characteristics are guaranteed from VCC = 1.2V to VCC = 5.5V.
ABSOLUTE MAXIMUM RATINGS1, 2

In accordance with the Absolute Maximum Rating System (IEC 134).
Voltages are referenced to GND (ground = 0V).
NOTES:
Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
Philips Semiconductors Product specification
74LV123Dual retriggerable monostable multivibrator
with reset
DC ELECTRICAL CHARACTERISTICS

Over recommended operating conditions. Voltages are referenced to GND (ground = 0V).
NOTES:
All typical values are measured at Tamb = 25°C.
Philips Semiconductors Product specification
74LV123Dual retriggerable monostable multivibrator
with reset
AC CHARACTERISTICS

GND = 0V; tr = tf ≤ 2.5ns; CL = 50pF; RL =1 KΩ
Philips Semiconductors Product specification
74LV123Dual retriggerable monostable multivibrator
with reset
AC CHARACTERISTICS (Continued)

GND = 0V; tr = tf ≤ 2.5ns; CL = 50pF; RL =1 KΩ
NOTES:
Unless otherwise stated, all typical values are at Tamb = 25°C. Typical value measured at VCC = 3.3V. Typical value measured at VCC = 5.0V. For other REXT and CEXT combinations see Figure 5.
if CEXT > 10 nF, the next formula is valid: = K x REXT x CEXT (typ.)
where,tW = output pulse width in ns;
REXT = external resistor in KΩ; CEXT = external capacitor in pF; = constant = 0.45 for VCC = 5.0V and 0.48 for VCC = 2.0V.
The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF. The time to retrigger the monostable multivibrator depends on the values of REXT and CEXT.
The output pulse width will only be extended when the time between the active-going edges of the
trigger pulses meets the minimum retrigger time.
If CEXT > 10 pF, the next formula (at VCC = 5.0V) for the set-up time of a retrigger pulse is valid:
trt = 30 + 0.19R x C-9 + 13 x R1.05 (typ.)
where,trt = retrigger time in ns;
CEXT = external capacitor in pF;
REXT = external resistor in KΩ.
The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF. When the device is powered up, initiate the device via a reset pulse, when CEXT < 50pF.
AC WAVEFORMS

VM = 1.5V at VCC � 2.7V; VM = 0.5 VCC at VCC � 2.7V; VOL and
VOH are the typical output voltage drop that occur with the output
load.
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