1. General description
The 74LV123 is a low-voltage Si-gate CMOS device and is pin and function compa tible
with the 74HC123; 74HCT123. It is a dual retriggerable monostable multivibrator which
uses three methods to control the output pulse width:
1. The basic pulse time is programmed by the sele ction of an external resistor (REXT)
and capacitor (CEXT). These are norma lly con n ec ted as sh own in Figure 9.
2. Once triggered, the basic output pulse width may b e extended by retrigger ing the
gated active LOW- going edge input (nA) or the active HIGH-going edge in put (nB). By
repeating this process, the ou tput pulse peri od (nQ = HIGH, n Q = LOW) can be made
as long as desired (see Figure 12).
3. Alternatively, an output delay can be ter mina ted at an y time by a LOW - going edg e on
input nRD, which also inhibits the triggering (see Figure 13).
Schmitt-trigger action in the nA and nB inputs makes the circuit highly tolerant of slower
input rise and fall times.
2. Features and benefits
Optimized for low-volta ge applications: 1.0 V to 5.5 V
Accepts TTL input levels between VCC = 2.7 V and VCC = 3.6 V
Typical output ground bounce: < 0.8 V at VCC = 3.3 V and Tamb = 25 C
Typical HIGH-leve l ou tput vo ltage (VOH) undershoot: > 2 V at VCC = 3.3 V and
Tamb = 25 C
DC triggered from active HIGH or active LOW inputs
Retriggerable for very long pulses up to 100 % duty factor
Direct reset termina te s ou tp ut puls es
Schmitt-trigger action on all inputs except for the rese t input
74LV123
Dual retriggerable monostable multivibrator with reset
Rev. 8 — 4 March 2016 Product data sheet
© Nexperia B.V. 2017. All rights reserved
74LV123 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 8 — 4 March 2016 2 of 23
Nexperia 74LV123
Dual retriggerable monostable multivibrator with reset
3. Ordering information
4. Functional diagram
Tabl e 1. Ordering information
Type number Package
Temperature range Name Description Version
74LV123D 40 Cto+125C SO16 plastic small outline package; 16 leads; body width
3.9 mm SOT109-1
74LV123DB 40 Cto+125C SSOP16 plastic shrink small outline package; 16 leads; body width
5.3 mm SOT338-1
74LV123PW 40 Cto+125C TSSOP16 plastic thin shrink small outline package; 16 leads; bo dy
width 4.4 mm SOT403-1
74LV123BQ 40 Cto+125C DHVQFN16 plastic dual in-line compatible thermal enhanced very thin
quad flat package; no leads; 16 terminals;
body 2.5 3.5 0.85 mm
SOT763-1
Fig 1. Logic symbol Fig 2. IEC logic symbol
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© Nexperia B.V. 2017. All rights reserved
74LV123 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 8 — 4 March 2016 3 of 23
Nexperia 74LV123
Dual retriggerable monostable multivibrator with reset
Fig 3. Functional diag ram
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© Nexperia B.V. 2017. All rights reserved
74LV123 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 8 — 4 March 2016 4 of 23
Nexperia 74LV123
Dual retriggerable monostable multivibrator with reset
Fig 4. Logic diagra m
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© Nexperia B.V. 2017. All rights reserved
74LV123 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 8 — 4 March 2016 5 of 23
Nexperia 74LV123
Dual retriggerable monostable multivibrator with reset
5. Pinning information
5.1 Pinning
5.2 Pin description
(1) This is not a supply pin. The substrate is attached to this
pad using conductive die attach material. There is no
electrical or mechanical requirement to solder this pad.
However, if it is soldered, the solder land should remain
floating or be connected to VCC.
Fig 5. Pin configuration for SO16 and (T)SSOP16 Fig 6. Pin configuration for DHVQFN16
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Table 2. Pin description
Symbol Pin Description
1A 1 negative-edge triggered input 1
1B 2 positive-edge triggered input 1
1RD 3 direct reset LOW and positive-edge triggered input 1
1Q 4 active LOW output 1
2Q 5 active HIGH output 2
2CEXT 6 external capacitor connection 2
2REXT/CEXT 7 external resistor and capacitor connection 2
GND 8 ground (0 V)
2A 9 negative-edge triggered input 2
2B 10 positive-edge triggered input 2
2RD 11 direct reset LOW and positive-edge triggered input 2
2Q 12 active LO W output 2
1Q 13 active HIGH output 1
1CEXT 14 external capacitor connection 1
1REXT/CEXT 15 external resistor and capacitor connection 1
VCC 16 supply voltage
© Nexperia B.V. 2017. All rights reserved
74LV123 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 8 — 4 March 2016 6 of 23
Nexperia 74LV123
Dual retriggerable monostable multivibrator with reset
6. Functional description
[1] H = HIGH voltage level;
L = LOW voltage level;
X = don’t care;
= LOW-to-HIGH transition;
= HIGH-to-LOW transition;
= one HIGH level output pulse
= one LOW level output pulse
[2] If the monostable multivibrator was triggered before this condition was established, the pulse will continue as programmed.
Table 3. Function table[1]
Input Output
nRDnA nB nQ nQ
LXXLH
XHXL
[2] H[2]
XXLL
[2] H[2]
HL
HH
LH
© Nexperia B.V. 2017. All rights reserved
74LV123 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 8 — 4 March 2016 7 of 23
Nexperia 74LV123
Dual retriggerable monostable multivibrator with reset
7. Limiting values
[1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
[2] For SO16 package: Ptot derates linearly with 8 mW/K above 70 C.
[3] For SSOP16 and TSSOP16 packages: Ptot derates linearly with 5.5 mW/K above 60 C.
[4] For DHVQFN16 package: Ptot derates linearly with 4.5 mW/K above 60 C.
8. Recommended operating conditions
[1] The 74LV123 is guaranteed to function down to VCC = 1.0 V (input levels GND or VCC); Section 9 “Static characteristics are guaranteed
from VCC = 1.2 V to VCC = 5.5 V.
[2] Except for Schmitt-trigger inputs nA and nB.
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Max Unit
VCC supply voltage 0.5 +7 V
IIK input clamping current VI<0.5 V or VI>V
CC +0.5V [1] -20 mA
IOK output clamping current VO<0.5 V or VO>V
CC +0.5V [1] -50 mA
IOoutput current except for pins nREXT/CEXT;
VO=0.5 V to (VCC +0.5V) [1] -25 mA
ICC supply current -+50mA
IGND ground current 50 - mA
Tstg storage temperature 65 +150 C
Ptot total power dissipation Tamb =40 C to +125 C
SO16 package [2] -500mW
SSOP16 package [3] -500mW
TSSOP16 package [3] -500mW
DHVQFN16 package [4] -500mW
Table 5. Recommended operating conditions
Symbol Parameter Conditions Min Typ Max Unit
VCC supply voltage [1] 1.0 3.3 5.5 V
VIinput voltage 0 - VCC V
VOoutput voltage 0 - VCC V
Tamb ambient temperature in free air 40 +25 +125 C
t/V input transition rise and fall rate VCC = 1.0 V to 2.0 V [2] - - 500 ns/V
VCC = 2.0 V to 2.7 V - - 200 ns/V
VCC = 2.7 V to 3.6 V - - 100 ns/V
VCC = 3.6 V to 5.5 V - - 50 ns/V
© Nexperia B.V. 2017. All rights reserved
74LV123 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 8 — 4 March 2016 8 of 23
Nexperia 74LV123
Dual retriggerable monostable multivibrator with reset
9. Static characteristics
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Typ[1] Max Unit
Tamb = 40 C to +85 C
VIH HIGH-level input voltage VCC = 1.2 V 0.9 - - V
VCC = 2.0 V 1.4 - - V
VCC = 2.7 V to 3.6 V 2.0 - - V
VCC = 4.5 V to 5.5 V 0.7 VCC --V
VIL LOW-level input voltage VCC = 1.2 V - - 0.3 V
VCC = 2.0 V - - 0.6 V
VCC = 2.7 V to 3.6 V - - 0.8 V
VCC = 4.5 V to 5.5 V - - 0.3 VCC V
VOH HIGH-level output voltage VI = VIH or VIL
lO = 100 A; VCC = 1.2 V - 1.2 - V
lO = 100 A; VCC = 2.0 V 1.8 2.0 - V
lO = 100 A; VCC = 2.7 V 2.5 2.7 - V
lO = 100 A; VCC = 3.0 V 2.8 3.0 - V
lO = 100 A; VCC = 4.5 V 4.3 4.5 - V
lO = 6 mA; VCC = 3.0 V 2.40 2.82 - V
lO = 12 mA; VCC = 4.5 V 3.60 4.20 - V
VOL LOW-level output voltage VI = VIH or VIL
IO = 100 A; VCC = 1.2 V - 0 - V
IO = 100 A; VCC = 2.0 V - 0 0.2 V
IO = 100 A; VCC = 2.7 V - 0 0.2 V
IO = 100 A; VCC = 3.0 V - 0 0.2 V
IO = 100 A; VCC = 4.5 V - 0 0.2 V
IO = 6 mA; VCC = 3.0 V - 0.25 0.40 V
IO = 12 mA; VCC = 4.5 V - 0.35 0.55 V
IIinput leakage current VI = VCC or GND; VCC = 5.5 V - - 1.0 A
ICC supply current VI = VCC or GND; IO = 0 A; VCC = 5.5 V - - 20.0 A
ICC additional supply current VI = VCC 0.6 V; VCC = 2.7 V to 3.6 V - - 500 A
CIinput capacitance - 3.5 - pF
© Nexperia B.V. 2017. All rights reserved
74LV123 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 8 — 4 March 2016 9 of 23
Nexperia 74LV123
Dual retriggerable monostable multivibrator with reset
[1] All typical values are measured at Tamb = 25 C.
Tamb = 40 C to +125 C
VIH HIGH-level input voltage VCC = 1.2 V 0.9 - - V
VCC = 2.0 V 1.4 - - V
VCC = 2.7 V to 3.6 V 2.0 - - V
VCC = 4.5 V to 5.5 V 0.7 VCC --V
VIL LOW-level input voltage VCC = 1.2 V - - 0.3 V
VCC = 2.0 V - - 0.6 V
VCC = 2.7 V to 3.6 V - - 0.8 V
VCC = 4.5 V to 5.5 V - - 0.3 VCC V
VOH HIGH-level output voltage VI = VIH or VIL
lO = 100 A; VCC = 1.2 V - - - V
lO = 100 A; VCC = 2.0 V 1.8 - - V
lO = 100 A; VCC = 2.7 V 2.5 - - V
lO = 100 A; VCC = 3.0 V 2.8 - - V
lO = 100 A; VCC = 4.5 V 4.3 - - V
lO = 6 mA; VCC = 3.0 V 2.2 - - V
lO = 12 mA; VCC = 4.5 V 3.5 - - V
VOL LOW-level output voltage VI = VIH or VIL
IO = 100 A; VCC = 1.2 V - - - V
IO = 100 A; VCC = 2.0 V - - 0.2 V
IO = 100 A; VCC = 2.7 V - - 0.2 V
IO = 100 A; VCC = 3.0 V - - 0.2 V
IO = 100 A; VCC = 4.5 V - - 0.2 V
IO = 6 mA; VCC = 3.0 V - - 0.5 V
IO = 12 mA; VCC = 4.5 V - - 0.65 V
IIinput leakage current VI = VCC or GND; VCC = 5.5 V - - 1.0 A
ICC supply current VI = VCC or GND; IO = 0 A; VCC = 5.5 V - - 160 A
ICC additional supply current VI = VCC 0.6 V ; VCC = 2.7 V to 3.6 V - - 850 A
Table 6. Static characteristics …continued
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Typ[1] Max Unit
© Nexperia B.V. 2017. All rights reserved
74LV123 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 8 — 4 March 2016 10 of 23
Nexperia 74LV123
Dual retriggerable monostable multivibrator with reset
10. Dynamic characteristics
Table 7. Dynamic characteristics
GND = 0 V; tr = tf
2.5 ns; for test circuit see Figure 8.
Symbol Parameter Conditions 40 C to +85 C40 C to +125 CUnit
Min Typ[1] Max Min Max
Propagation delay; see Figure 7
tpd propagation
delay nRD, nA and nB to nQ [2]
VCC = 1.2 V - 120 - - - ns
VCC = 2.0 V - 40 76 - 92 ns
VCC = 2.7 V - 30 56 - 68 ns
VCC = 3.0 V to 3.6 V - 25 48 - 57 ns
VCC = 4.5 V to 5.5 V - 18 40 - 46 ns
nRD to nQ (reset) [2]
VCC = 1.2 V - 100 - - - ns
VCC = 2.0 V - 30 57 - 68 ns
VCC = 2.7 V - 23 43 - 51 ns
VCC = 3.0 V to 3.6 V - 20 38 - 45 ns
VCC = 4.5 V to 5.5 V - 14 31 - 36 ns
Inputs nA, nB and nRD; see Figure 7
tWpulse width nA = LOW
VCC = 2.0 V 30 5 - 40 - ns
VCC = 2.7 V 25 3.5 - 30 - ns
VCC = 3.0 V to 3.6 V 20 3.0 - 25 - ns
VCC = 4.5 V to 5.5 V 15 2.5 - 20 - ns
nB = HIGH
VCC = 2.0 V 30 13 - 40 - ns
VCC = 2.7 V 25 8 - 30 - ns
VCC = 3.0 V to 3.6 V 20 7 - 25 - ns
VCC = 4.5 V to 5.5 V 15 5 - 20 - ns
nRD = LOW; see Figure 13
VCC = 2.0 V 35 6 - 45 - ns
VCC = 2.7 V 30 5 - 40 - ns
VCC = 3.0 V to 3.6 V 25 4 - 30 - ns
VCC = 4.5 V to 5.5 V 20 3 - 25 - ns
trtrig retrigger time nB to nA; see Figure 12
VCC = 2.0 V - 70 - - - ns
VCC = 2.7 V - 55 - - - ns
VCC = 3.0 V to 3.6 V - 45 - - - ns
VCC = 4.5 V to 5.5 V - 40 - - - ns
© Nexperia B.V. 2017. All rights reserved
74LV123 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 8 — 4 March 2016 11 of 23
Nexperia 74LV123
Dual retriggerable monostable multivibrator with reset
[1] All typical values are measured at Tamb = 25 C and nominal supply values (VCC = 3.3 V and 5.0 V).
[2] tpd is the same as tPLH and tPHL; CEXT = 0 pF; REXT =5 k.
[3] For other REXT and CEXT combinations see Figure 11 and Section 12.1.1 “Basic timing.
[4] CEXT has no limits.
[5] CPD is used to determine the dynamic power dissipation (PD in W).
PD=C
PD VCC2fiN+(CLVCC2fo) where:
fi= input frequency in MHz;
fo= output frequency in MHz;
CL= output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
(CLVCC2fo) = sum of the outputs.
Outputs; nQ = LOW and nQ = HIGH, see Figure 7
tWpulse width CEXT = 100 nF; REXT = 10 k
VCC = 2.0 V -470- - -ns
VCC = 2.7 V - 460 - - - ns
VCC = 3.0 V to 3.6 V - 450 - - - ns
VCC = 4.5 V to 5.5 V - 430 - - - ns
CEXT = 0 pF; REXT = 5 k
VCC = 2.0 V - 100 - - - ns
VCC = 2.7 V - 90 - - - ns
VCC = 3.0 V to 3.6 V - 80 - - - ns
VCC = 4.5 V to 5.5 V - 70 - - - ns
External components
REXT external
resistance see Figure 11 [3]
VCC = 1.2 V 10 - 1000 - - k
VCC = 2.0 V 5 - 1000 - - k
VCC = 2.7 V 3 - 1000 - - k
VCC = 3.0 V to 3.6 V 2 - 1000 - - k
VCC = 4.5 V to 5.5 V 2 - 1000 - - k
CEXT external
capacitance see Figure 11 [3]
[4]
VCC = 1.2 V - - - - - pF
VCC = 2.0 V - - - - - pF
VCC = 2.7 V - - - - - pF
VCC = 3.0 V to 3.6 V - - - - - pF
VCC = 4.5 V to 5.5 V - - - - - pF
Dynamic power dissipation
CPD power
dissipation
capacitance
VCC =3.3V; V
I = GND to VCC [5] -60- - -pF
Table 7. Dynamic characteristics …continued
GND = 0 V; tr = tf
2.5 ns; for test circuit see Figure 8.
Symbol Parameter Conditions 40 C to +85 C40 C to +125 CUnit
Min Typ[1] Max Min Max
© Nexperia B.V. 2017. All rights reserved
74LV123 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 8 — 4 March 2016 12 of 23
Nexperia 74LV123
Dual retriggerable monostable multivibrator with reset
11. Waveforms
Measurement points are given in Table 8.
Fig 7. Propagation delays from inputs (nA, nB, nRD) to outputs (nQ, nQ)
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VCC VM
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< 2.7 V 0.5 VCC
Test data is given in Table 9.
Definitions for test circuit:
RL = Load resistance.
CL = Load capacitance including jig and probe capacitance.
RT = Termination resistance should be equal to Zo of the pulse generator.
Fig 8. Test circuit for measuring switching times
© Nexperia B.V. 2017. All rights reserved
74LV123 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 8 — 4 March 2016 13 of 23
Nexperia 74LV123
Dual retriggerable monostable multivibrator with reset
12. Application information
12.1 Timing components
12.1.1 Basic timing
The basic output pulse wid th is essentially determined by the values of the external timing
component s REXT and CEXT.
If CEXT > 10 nF, the following formula is valid: tW = K REXT CEXT (typ.) where:
tW = output pulse width in ns
REXT = external resistor in k
CEXT = external capacitor in pF
K = constant: this is 0.45 for VCC = 5.0 V and 0.48 for VCC = 2.0 V (see Figure 10)
The inherent test jig and pin capacitance at pin 15 and pin 7 (nREXT/CEXT) is
approximately 7 pF.
Table 9. Test data
Supply voltage Input Load Test
VCC VItr, tfCLRL
< 2.7 V VCC 2.5 ns 5 0 pF 1 ktPHL, tPLH
2.7 V to 3.6 V 2.7 V 2.5 ns 50 pF 1 ktPHL, tPLH
4.5 V VCC 2.5 ns 50 pF 1 ktPHL, tPLH
(1) For minimum noise generation it is recommended to ground pins 6 (2CEXT) and 14 (1CEXT)
externally to pin 8 (GND).
Fig 9. Timing components connections
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© Nexperia B.V. 2017. All rights reserved
74LV123 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 8 — 4 March 2016 14 of 23
Nexperia 74LV123
Dual retriggerable monostable multivibrator with reset
12.1.2 Retrigger timing
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 for the set-up time of a retrigger pulse is valid:
at VCC = 5.0 V: trtrig = 30 + 0.19REXT CEXT0.9 + 13 REXT1.05 (typ.)
at VCC = 3.0 V: trtrig = 41 + 0.15REXT CEXT0.9 1 REXT (typ.)
where:
trtrig = retrigger time in ns
CEXT = external capacitor in pF
REXT = external resistor in k
CEXT =10nF; R
EXT = 10 k to 100 k VCC = 3.3 V and Tamb = 25 C
Fig 10. Typical ‘K’ facto r as a fun ction of VCC Fig 11. Typical output pulse width as a function of the
external ca pacitance values
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Fig 12. Outp ut pu ls e co ntrol using retrigger pu ls e nA
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© Nexperia B.V. 2017. All rights reserved
74LV123 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 8 — 4 March 2016 15 of 23
Nexperia 74LV123
Dual retriggerable monostable multivibrator with reset
12.1.3 Reset timing
12.2 Power considerations
12.2.1 Power-up
When the monostable multivibrator is powered-up, it may produce an output pulse with a
pulse width defined by the values of REXT and CEXT. This output pulse can be eliminated
using the RC circuit on pin nRD shown in Figure 14.
12.2.2 Power-down
A large capacitor (CEXT) may cause problems when powering-down the monostable due
to the energy stored in this cap acitor. When a system containing this device is
powered-down or a r apid decrease of VCC to zero occurs, the monostable may sustain
damage, due to the capacitor discharging through the input protection diodes. To avoid
this possibility, connect a damping diode DEXT (preferably a germanium or Schottky type
diode) able to withstand large current surges - see Figure 14.
nA = LOW
Fig 13. Output pulse control using reset input nRD
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© Nexperia B.V. 2017. All rights reserved
74LV123 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 8 — 4 March 2016 16 of 23
Nexperia 74LV123
Dual retriggerable monostable multivibrator with reset
13. Package outline
Fig 15. Package outline SOT109-1 (SO16)
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© Nexperia B.V. 2017. All rights reserved
74LV123 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 8 — 4 March 2016 17 of 23
Nexperia 74LV123
Dual retriggerable monostable multivibrator with reset
Fig 16. Package outline SOT338-1 (SSOP16)
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