1. General description
The 74AHC123A; 74AHCT123A 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 74AHC123A; 74AHCT123A 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 Figure 11.
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 gate makes it possible to trigger the circuit by
a positive-going signal at input nRD as shown in Table 3.Figure 8 and Figure 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 REXT and CEXT. When
CEXT ≥10 nF, the typical output pulse width is defined as: tW=R
EXT ×CEXT where
tW= pulse width in ns; REXT = external resistor in kΩ; CEXT = external capacitor in pF.
Schmitt-trigger action at all inputs makes the circuit highly tolerant to slower input rise and
fall times. The 74AHC123A; 74AHCT123A is identical to the 74AHC423; 74AHCT423 but
can be triggered via the reset input.
2. Features
■All inputs have a Schmitt-trigger action
■Inputs accept voltages higher than VCC
■DC triggered from active HIGH or active LOW inputs
■Retriggerable for very long pulses up to 100 % duty factor
■Direct reset terminates output pulse
■For 74AHC123A only: operates with CMOS input levels
■For 74AHCT123A only: operates with TTL input levels
■ESD protection:
◆HBM JESD22-A114E exceeds 2000 V
◆MM JESD22-A115-A exceeds 200 V
◆CDM JESD22-C101C exceeds 1000 V
■Multiple package options
■Specified from −40 °C to +85 °C and from −40 °C to +125 °C
74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
Rev. 02 — 18 January 2008 Product data sheet
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 2 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
3. Ordering information
4. Functional diagram
Table 1. Ordering information
Type number Package
Temperature range Name Description Version
74AHC123AD −40 °C to +125 °C SO16 plastic small outline package; 16 leads;
body width 3.9 mm SOT109-1
74AHCT123AD
74AHC123APW −40 °C to +125 °C TSSOP16 plastic thin shrink small outline package; 16 leads;
body width 4.4 mm SOT403-1
74AHCT123APW
74AHC123ABQ −40 °C to +125 °C 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
74AHCT123ABQ
Fig 1. Logic symbol Fig 2. IEC logic symbol
001aae521
14
1
2
3
1A
1B
1RD
9
10
11
2A
2B
2RD
15
S
Q
Q
T
RD
13
4
1CEXT
1REXT/CEXT
1Q
1Q
6
7
5
12
2CEXT
2REXT/CEXT
2Q
2Q
1
2
3
13
CX
&
RCX
R
R
14
4
15
001aae522
9
10
11
5
CX
&
RCX
6
12
7
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 3 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
Fig 3. Functional diagram
1Q
Q
2RD
RD
S13
1REXT/CEXT
15
1CEXT
14
1Q
Q4
9
001aaa610
1RD
2A
1
1A
10
2B
2
11
3
1B
T
Q
RD
S
2REXT/CEXT
7
2CEXT
6
2Q
5
Q2Q
12
T
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 4 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
For minimum noise generation it is recommended to ground pins 6 (2CEXT) and 14 (1CEXT) externally to pin 8 (GND).
Fig 4. Functional diagram
001aae524
VCC
nREXT/CEXT
Q
Q
CL CL
R
CL
CLCL VCC
VCC
RR
RD
R
A
B
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 5 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
5. Pinning information
5.1 Pinning
5.2 Pin description
(1) The die substrate is attached to this pad using
conductive die attach material. It can not be used as
a supply pin or input.
Fig 5. Pin configuration SO16, TSSOP16 Fig 6. Pin configuration DHVQFN16
74AHC123A
74AHCT123A
1A VCC
1B 1REXT/CEXT
1RD 1CEXT
1Q 1Q
2Q 2Q
2CEXT 2RD
2REXT/CEXT 2B
GND 2A
001aah068
1
2
3
4
5
6
7
8
10
9
12
11
14
13
16
15
001aah067
74AHC123A
74AHCT123A
2REXT/CEXT 2B
2CEXT 2RD
2Q 2Q
1Q 1Q
1RD 1CEXT
1B 1REXT/CEXT
GND
2A
1A
VCC
Transparent top view
7 10
6 11
5 12
4 13
3 14
2 15
8
9
1
16
terminal 1
index area
GND(1)
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 LOW 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
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 6 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
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.
7. Limiting values
[1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
[2] Ptot derates linearly with 8 mW/K above 70 °C.
[3] Ptot derates linearly with 5.5 mW/K above 60 °C.
[4] Ptot derates linearly with 4.5 mW/K above 60 °C.
Table 3. Function table[1]
Input Output
nRD nA nB nQ nQ
LXXLH
XHXL
[2] H[2]
XXLL
[2] H[2]
HL↑
H↓H
↑LH
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 +7.0 V
VIinput voltage −0.5 +7.0 V
IIK input clamping current VI < −0.5 V [1] −20 - mA
IOK output clamping current VO<−0.5 V or VO>V
CC + 0.5 V [1] -±20 mA
IOoutput current VO = −0.5 V to (VCC + 0.5 V) - ±25 mA
ICC supply current - 75 mA
IGND ground current −75 - mA
Tstg storage temperature −65 +150 °C
Ptot total power dissipation Tamb = −40 °C to +125 °C
SO16 package [2] - 500 mW
TSSOP16 package [3] - 500 mW
DHVQFN16 package [4] - 500 mW
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 7 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
8. Recommended operating conditions
9. Static characteristics
Table 5. Recommended operating conditions
Voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions 74AHC123A 74AHCT123A Unit
Min Typ Max Min Typ Max
VCC supply voltage 2.0 5.0 5.5 4.5 5.0 5.5 V
VIinput voltage 0 - 5.5 0 - 5.5 V
VOoutput voltage 0 - VCC 0- V
CC V
Tamb ambient temperature −40 +25 +125 −40 +25 +125 °C
∆t/∆V input transition rise
and fall rate VCC = 3.3 V ± 0.3 V - - 100 - - - ns/V
VCC = 5.0 V ± 0.5 V - - 20 - - 20 ns/V
Table 6. Static characteristics
Voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions 25 °C−40 °C to +85 °C−40 °C to +125 °C Unit
Min Typ Max Min Max Min Max
74AHC123A
VIH HIGH-level
input voltage VCC = 2.0 V 1.5 - - 1.5 - 1.5 - V
VCC = 3.0 V 2.1 - - 2.1 - 2.1 - V
VCC = 5.5 V 3.85 - - 3.85 - 3.85 - V
VIL LOW-level
input voltage VCC = 2.0 V - - 0.5 - 0.5 - 0.5 V
VCC = 3.0 V - - 0.9 - 0.9 - 0.9 V
VCC = 5.5 V - - 1.65 - 1.65 - 1.65 V
VOH HIGH-level
output
voltage
VI= VIH or VIL
IO=−50 µA; VCC = 2.0 V 1.9 2.0 - 1.9 - 1.9 - V
IO=−50 µA; VCC = 3.0 V 2.9 3.0 - 2.9 - 2.9 - V
IO=−50 µA; VCC = 4.5 V 4.4 4.5 - 4.4 - 4.4 - V
IO=−4.0 mA; VCC = 3.0 V 2.58 - - 2.48 - 2.40 - V
IO=−8.0 mA; VCC = 4.5 V 3.94 - - 3.8 - 3.70 - V
VOL LOW-level
output
voltage
VI= VIH or VIL
IO= 50 µA; VCC = 2.0 V - 0 0.1 - 0.1 - 0.1 V
IO= 50 µA; VCC = 3.0 V - 0 0.1 - 0.1 - 0.1 V
IO= 50 µA; VCC = 4.5 V - 0 0.1 - 0.1 - 0.1 V
IO= 4.0 mA; VCC = 3.0 V - - 0.36 - 0.44 - 0.55 V
IO= 8.0 mA; VCC = 4.5 V - - 0.36 - 0.44 - 0.55 V
IIinputleakage
current VI= 5.5 Vor GND;
VCC = 0 V to 5.5 V
nREXT/CEXT [1] --±0.25 - ±2.5 - ±10.0 µA
pin nA, nB, nRD - - ±0.1 - ±1.0 - ±2.0 µA
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 8 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
[1] Voltage on nREXT/CEXT = 0.5 × VCC and pin REXT/CEXT in OFF-state during test.
ICC supply
current VI=V
CC or GND; IO = 0 A;
VCC = 5.5 V - - 4.0 - 40 - 80 µA
active state (per circuit);
VI=V
CC or GND [1]
VCC = 3.0 V - 160 250 - 280 - 280 µA
VCC = 4.5 V - 380 500 - 650 - 650 µA
VCC = 5.5 V - 560 750 - 975 - 975 µA
CIinput
capacitance - 5.0 10 - 10 - 10 pF
COoutput
capacitance - 4.0 - - - - - pF
74AHCT123A
VIH HIGH-level
input voltage VCC = 4.5 V to 5.5 V 2.0 - - 2.0 - 2.0 - V
VIL LOW-level
input voltage VCC = 4.5 V to 5.5 V - - 0.8 - 0.8 - 0.8 V
VOH HIGH-level
output
voltage
VI= VIH or VIL; VCC = 4.5 V
IO=−50 µA 4.4 4.5 - 4.4 - 4.4 - V
IO=−8.0 mA 3.94 - - 3.8 - 3.70 - V
VOL LOW-level
output
voltage
VI= VIH or VIL; VCC = 4.5 V
IO= 50 µA - 0 0.1 - 0.1 - 0.1 V
IO= 8.0 mA - - 0.36 - 0.44 - 0.55 V
IIinputleakage
current nREXT/CEXT;
VI= 5.5 Vor GND;
VCC = 0 V to 5.5 V
[1] --±0.25 - ±2.5 - ±10.0 µA
pin nA, nB, nRD;
VI=V
CC or GND;
VCC = 5.5 V
--±0.1 - ±1.0 - ±2.0 µA
ICC supply
current VI=V
CC or GND; IO = 0 A;
VCC = 5.5 V - - 4.0 - 40 - 80 µA
active state (per circuit);
VI=V
CC or GND [1]
VCC = 4.5 V - 380 500 - 650 - 650 µA
VCC = 5.5 V - 560 750 - 975 - 975 µA
CIinput
capacitance - 3 10 - 10 - 10 pF
COoutput
capacitance - 4.0 - - - - - pF
Table 6. Static characteristics
…continued
Voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions 25 °C−40 °C to +85 °C−40 °C to +125 °C Unit
Min Typ Max Min Max Min Max
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 9 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
10. Dynamic characteristics
Table 7. Dynamic characteristics
GND = 0 V; For test circuit see Figure 12.
Symbol Parameter Conditions 25 °C−40 °C to +85 °C−40 °C to +125 °C Unit
Min Typ[1] Max Min Max Min Max
74AHC123A
tpd propagation
delay nA and nB to nQ and nQ;
see Figure 7 [2]
VCC = 3.0 V to 3.6 V
CL= 15 pF - 7.4 20.6 1.0 24.0 1.0 26.0 ns
CL= 50 pF - 10.5 24.1 1.0 27.5 1.0 30.0 ns
VCC = 4.5 V to 5.5 V
CL= 15 pF - 5.1 12.0 1.0 14.0 1.0 15.5 ns
CL= 50 pF - 7.3 14.0 1.0 16.0 1.0 17.5 ns
nRD to nQ and nQ;
see Figure 7 [2]
VCC = 3.0 V to 3.6 V
CL= 15 pF - 8.2 22.4 1.0 26.0 1.0 28.0 ns
CL= 50 pF - 11.7 25.9 1.0 29.5 1.0 32.0 ns
VCC = 4.5 V to 5.5 V
CL= 15 pF - 5.6 12.9 1.0 15.0 1.0 16.5 ns
CL= 50 pF - 8.1 14.9 1.0 17.0 1.0 19.0 ns
nRD to nQ and nQ (reset);
see Figure 7 [2]
VCC = 3.0 V to 3.6 V
CL= 15 pF - 6.4 15.8 1.0 18.5 1.0 20.0 ns
CL= 50 pF - 9.2 19.3 1.0 22.0 1.0 24.5 ns
VCC = 4.5 V to 5.5 V
CL= 15 pF - 4.4 9.4 1.0 11.0 1.0 12.0 ns
CL= 50 pF - 6.3 11.4 1.0 13.0 1.0 14.5 ns
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 10 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
tWpulse width inputs; nA = LOW;
see Figure 7
VCC = 3.0 V to 3.6 V 5.0 - - 5.0 - 5.0 - ns
VCC = 4.5 V to 5.5 V 5.0 - - 5.0 - 5.0 - ns
inputs; nB = HIGH;
see Figure 7
VCC = 3.0 V to 3.6 V 5.0 - - 5.0 - 5.0 - ns
VCC = 4.5 V to 5.5 V 5.0 - - 5.0 - 5.0 - ns
inputs; nRD = LOW;
see Figure 7
VCC = 3.0 V to 3.6 V 5.0 - - 5.0 - 5.0 - ns
VCC = 4.5 V to 5.5 V 5.0 - - 5.0 - 5.0 - ns
outputs; nQ = LOW and
nQ = HIGH; CL= 50 pF;
see Figure 7,Figure 8,
Figure 9 and Figure 10
[3]
CEXT = 28 pF; REXT =2kΩ
VCC = 3.0 V to 3.6 V - 115 240 - 300 - 300 ns
VCC = 4.5 V to 5.5 V - 100 200 - 240 - 240 ns
CEXT = 0.01 µF;
REXT =10kΩ
VCC = 3.0 V to 3.6 V 90 100 110 90 110 85 115 µs
VCC = 4.5 V to 5.5 V 90 100 110 90 110 85 115 µs
CEXT = 0.1 µF;
REXT =10kΩ;
VCC = 3.0 V to 3.6 V 0.9 1 1.1 0.9 1.1 0.85 1.15 ms
VCC = 4.5 V to 5.5 V 0.9 1 1.1 0.9 1.1 0.85 1.15 ms
trtrig retrigger
time nA to nB; CEXT = 100 pF;
REXT =1kΩ; CL= 50 pF;
see Figure 8 and Figure 10
VCC = 3.0 V to 3.6 V - 60 - - - - - ns
VCC = 4.5 V to 5.5 V - 39 - - - - - ns
nA to nB; CEXT = 0.01 µF;
REXT =1kΩ; CL= 50 pF;
see Figure 8 and Figure 10
VCC = 3.0 V to 3.6 V - 1.5 - - - - - µs
VCC = 4.5 V to 5.5 V - 1.2 - - - - - µs
CPD power
dissipation
capacitance
CL= 50 pF; fi = 1 MHz;
VI= GND to VCC
[4] -57- - - - -pF
Table 7. Dynamic characteristics
…continued
GND = 0 V; For test circuit see Figure 12.
Symbol Parameter Conditions 25 °C−40 °C to +85 °C−40 °C to +125 °C Unit
Min Typ[1] Max Min Max Min Max
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 11 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
74AHCT123A
tpd propagation
delay nA and nB to nQ and nQ;
see Figure 7 [2]
VCC = 4.5 V to 5.5 V
CL= 15 pF - 5.0 12.0 1.0 14.0 1.0 15.5 ns
CL= 50 pF - 7.1 14.0 1.0 16.0 1.0 17.5 ns
nRD to nQ and nQ;
see Figure 7 [2]
VCC = 4.5 V to 5.5 V
CL= 15 pF - 5.2 12.9 1.0 15.0 1.0 16.5 ns
CL= 50 pF - 7.5 14.9 1.0 17.0 1.0 18.5 ns
nRD to nQ and nQ (reset);
see Figure 7 [2]
VCC = 4.5 V to 5.5 V
CL= 15 pF - 4.7 9.4 1.0 11.0 1.0 12.0 ns
CL= 50 pF - 6.7 11.4 1.0 13.0 1.0 14.5 ns
tWpulse width inputs; nA = LOW;
CL= 50 pF; see Figure 7
VCC = 4.5 V to 5.5 V 5.0 - - 5.0 - 5.0 - ns
inputs; nB = HIGH;
CL= 50 pF; see Figure 7
VCC = 4.5 V to 5.5 V 5.0 - - 5.0 - 5.0 - ns
inputs; nRD = LOW;
CL= 50 pF; see Figure 7
VCC = 4.5 V to 5.5 V 5.0 - - 5.0 - 5.0 - ns
outputs; nQ = LOW and
nQ = HIGH; CL= 50 pF;
CEXT = 28 pF; REXT =2kΩ;
see Figure 7,Figure 8,
Figure 9 and Figure 10
[3]
VCC = 4.5 V to 5.5 V - 100 200 - 240 - 240 ns
CEXT = 0.01 µF;
REXT =10kΩ
VCC = 4.5 V to 5.5 V 90 100 110 90 110 85 115 µs
CEXT = 0.1 µF;
REXT =10kΩ
VCC = 4.5 V to 5.5 V 0.9 1 1.1 0.9 1.1 0.85 1.15 ms
Table 7. Dynamic characteristics
…continued
GND = 0 V; For test circuit see Figure 12.
Symbol Parameter Conditions 25 °C−40 °C to +85 °C−40 °C to +125 °C Unit
Min Typ[1] Max Min Max Min Max
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 12 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
[1] Typical values are measured at nominal supply voltage (VCC = 3.3 V and VCC = 5.0 V).
[2] tpd is the same as tPLH and tPHL; CEXT = 0 pF; REXT =5 kΩ.
[3] For CEXT ≥10 nF the typical value of the pulse width tW (µs) = CEXT (nF) × REXT (kΩ).
[4] CPD is used to determine the dynamic power dissipation PD(µW).
PD=C
PD ×VCC2×fi+∑(CL×VCC2×fo) where:
fi= input frequency in MHz;
fo= output frequency in MHz;
CL= output load capacitance in pF;
VCC = supply voltage in V.
[5] CEXT has no limits.
trtrig retrigger
time nA to nB; CEXT = 100 pF;
REXT =1kΩ; CL= 50 pF;
see Figure 8 and Figure 10
VCC = 4.5 V to 5.5 V - 60 - - - - - ns
nA to nB; CEXT = 0.01 µF;
REXT =1kΩ; CL= 50 pF;
see Figure 8 and Figure 10
VCC = 4.5 V to 5.5 V - 1.5 - - - - - µs
CPD power
dissipation
capacitance
CL= 50 pF; fi = 1 MHz;
VI= GND to VCC
[4] -58- - - - -pF
External components
REXT external
resistance VCC = 2.0 V 5 - - - - - - kΩ
VCC > 3.0 V 1 - - - - - - kΩ
CEXT external
capacitance VCC = 2.0 V [5] ---- - - -pF
VCC > 3.0 V [5] ---- - - -pF
Table 7. Dynamic characteristics
…continued
GND = 0 V; For test circuit see Figure 12.
Symbol Parameter Conditions 25 °C−40 °C to +85 °C−40 °C to +125 °C Unit
Min Typ[1] Max Min Max Min Max
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 13 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
11. Waveforms
Measurement points are given in Table 8.
Fig 7. Propagation delay input (nA, nB, nRD) to output (nQ, nQ)
001aae528
nB input
(nA LOW)
tW
tW
tPLH
VM
VM
VM
tW
tPLH
tW
tPHL
tPHL
VM
tW
tPLH
nA input
(nB HIGH)
nRD input
nQ output
nQ output
VM
tPHL
tPHL tPLH
RESET
Table 8. Measurement points
Type Input Output
VMVM
74AHC123A 0.5VCC 0.5VCC
74AHCT123A 1.5 V 0.5VCC
nRD = HIGH
Fig 8. Output pulse control using retrigger pulse
001aae526
nB input
nQ output
nA input
trtrig tW
tW
tW
tW
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 14 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
nA = LOW
Fig 9. Output pulse control using reset input nRD
001aae527
nB input
nQ output
nRD input
tW
tW
Fig 10. Input and output timing
trt
tWtWtW + trt
nA input
nB input
nRD input
nREXT/CEXT
nQ output
nQ output
001aah086
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 15 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
Fig 11. Timing component connections
VCC
REXT
to nCEXT
(pin 14 or 6) to nREXT/CEXT
(pin 15 or 7)
CEXT
mna519
Test data is given in Table 9.
Definitions test circuit:
RT = Termination resistance should be equal to output impedance Zo of the pulse generator
CL = Load capacitance including jig and probe capacitance
RL = Load resistor
S1 = Test selection switch
Fig 12. Load circuitry for switching times
VMVM
tW
tW
10 %
90 %
0 V
VI
VI
negative
pulse
positive
pulse
0 V
VMVM
90 %
10 %
tf
tr
tr
tf
001aad983
DUT
VCC VCC
VIVO
RT
RLS1
CL
open
PULSE
GENERATOR
Table 9. Test data
Type Input Load S1 position
VItr, tfCLRLtPHL, tPLH tPZH, tPHZ tPZL, tPLZ
74AHC123A VCC 3.0 ns 15 pF, 50 pF 1 kΩopen GND VCC
74AHCT123A 3.0 V 3.0 ns 15 pF, 50 pF 1 kΩopen GND VCC
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 16 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
12. Package outline
Fig 13. Package outline SOT109-1 (SO16)
X
wM
θ
A
A1
A2
bp
D
HE
Lp
Q
detail X
E
Z
e
c
L
vMA
(A )
3
A
8
9
1
16
y
pin 1 index
UNIT A
max. A1A2A3bpcD
(1) E(1) (1)
eH
ELL
pQZywv θ
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm
inches
1.75 0.25
0.10 1.45
1.25 0.25 0.49
0.36 0.25
0.19 10.0
9.8 4.0
3.8 1.27 6.2
5.8 0.7
0.6 0.7
0.3 8
0
o
o
0.25 0.1
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
Note
1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.
1.0
0.4
SOT109-1 99-12-27
03-02-19
076E07 MS-012
0.069 0.010
0.004 0.057
0.049 0.01 0.019
0.014 0.0100
0.0075 0.39
0.38 0.16
0.15 0.05
1.05
0.041
0.244
0.228 0.028
0.020 0.028
0.012
0.01
0.25
0.01 0.004
0.039
0.016
0 2.5 5 mm
scale
SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 17 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
Fig 14. Package outline SOT403-1 (TSSOP16)
UNIT A1A2A3bpcD
(1) E(2) (1)
eH
ELL
pQZywv θ
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm 0.15
0.05 0.95
0.80 0.30
0.19 0.2
0.1 5.1
4.9 4.5
4.3 0.65 6.6
6.2 0.4
0.3 0.40
0.06 8
0
o
o
0.13 0.10.21
DIMENSIONS (mm are the original dimensions)
Notes
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
2. Plastic interlead protrusions of 0.25 mm maximum per side are not included.
0.75
0.50
SOT403-1 MO-153 99-12-27
03-02-18
wM
bp
D
Z
e
0.25
18
16 9
θ
A
A1
A2
Lp
Q
detail X
L
(A )
3
HE
E
c
vMA
X
A
y
0 2.5 5 mm
scale
TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm SOT403-1
A
max.
1.1
pin 1 index
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 18 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
Fig 15. Package outline SOT763-1 (DHVQFN16)
terminal 1
index area
0.51
A1Eh
b
UNIT ye
0.2
c
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm 3.6
3.4
Dh
2.15
1.85
y1
2.6
2.4 1.15
0.85
e1
2.5
0.30
0.18
0.05
0.00 0.05 0.1
DIMENSIONS (mm are the original dimensions)
SOT763-1 MO-241 - - -- - -
0.5
0.3
L
0.1
v
0.05
w
0 2.5 5 mm
scale
SOT763-1
DHVQFN16: plastic dual in-line compatible thermal enhanced very thin quad flat package; no leads;
16 terminals; body 2.5 x 3.5 x 0.85 mm
A(1)
max.
AA1c
detail X
y
y1C
e
L
Eh
Dh
e
e1
b
27
15 10
9
8
1
16
X
D
E
C
BA
terminal 1
index area
AC
CB
vM
wM
E(1)
Note
1. Plastic or metal protrusions of 0.075 mm maximum per side are not included.
D(1)
02-10-17
03-01-27
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 19 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
13. Abbreviations
14. Revision history
Table 10. Abbreviations
Acronym Description
CDM Charged-Device Model
CMOS Complementary Metal Oxide Semiconductor
DUT Device Under Test
ESD ElectroStatic Discharge
HBM Human Body Model
MM Machine Model
TTL Transistor-Transistor Logic
Table 11. Revision history
Document ID Release date Data sheet status Change notice Supersedes
74AHC_AHCT123A_2 20080118 Product data sheet - 74AHC_AHCT123A_1
Modifications: •The format of this data sheet has been redesigned to comply with the new identity
guidelines of NXP Semiconductors.
•Legal texts have been adapted to the new company name where appropriate.
•Section 3: DHVQFN16 package added.
•Section 7: derating values added for DHVQFN16 package.
•Section 12: outline drawing added for DHVQFN16 package.
74AHC_AHCT123A_1 20000315 Product specification - -
74AHC_AHCT123A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 18 January 2008 20 of 21
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
15. Legal information
15.1 Data sheet status
[1] Please consult the most recently issued document before initiating or completing a design.
[2] The term ‘short data sheet’ is explained in section “Definitions”.
[3] The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nxp.com.
15.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liability for the consequences of
use of such information.
Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and title. A short data sheet is intended
for quick reference only and should not be relied upon to contain detailed and
full information. For detailed and full information see the relevant full data
sheet, which is available on request via the local NXP Semiconductors sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall prevail.
15.3 Disclaimers
General — Information in this document is believed to be accurate and
reliable. However, NXP Semiconductors does not give any representations or
warranties, expressed or implied, as to the accuracy or completeness of such
information and shall have no liability for the consequences of use of such
information.
Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all information supplied prior
to the publication hereof.
Suitability for use — NXP Semiconductors products are not designed,
authorized or warranted to be suitable for use in medical, military, aircraft,
space or life support equipment, nor in applications where failure or
malfunction of an NXP Semiconductors product can reasonably be expected
to result in personal injury, death or severe property or environmental
damage. NXP Semiconductors accepts no liability for inclusion and/or use of
NXP Semiconductors products in such equipment or applications and
therefore such inclusion and/or use is at the customer’s own risk.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) may cause permanent
damage to the device. Limiting values are stress ratings only and operation of
the device at these or any other conditions above those given in the
Characteristics sections of this document is not implied. Exposure to limiting
values for extended periods may affect device reliability.
Terms and conditions of sale — NXP Semiconductors products are sold
subject to the general terms and conditions of commercial sale, as published
at http://www.nxp.com/profile/terms, including those pertaining to warranty,
intellectual property rights infringement and limitation of liability, unless
explicitly otherwise agreed to in writing by NXP Semiconductors. In case of
any inconsistency or conflict between information in this document and such
terms and conditions, the latter will prevail.
No offer to sell or license — Nothing in this document may be interpreted
or construed as an offer to sell products that is open for acceptance or the
grant, conveyance or implication of any license under any copyrights, patents
or other industrial or intellectual property rights.
15.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.
16. Contact information
For additional information, please visit: http://www.nxp.com
For sales office addresses, send an email to: salesaddresses@nxp.com
Document status[1][2] Product status[3] Definition
Objective [short] data sheet Development This document contains data from the objective specification for product development.
Preliminary [short] data sheet Qualification This document contains data from the preliminary specification.
Product [short] data sheet Production This document contains the product specification.
NXP Semiconductors 74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
© NXP B.V. 2008. All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of release: 18 January 2008
Document identifier: 74AHC_AHCT123A_2
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
17. Contents
1 General description. . . . . . . . . . . . . . . . . . . . . . 1
2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3 Ordering information. . . . . . . . . . . . . . . . . . . . . 2
4 Functional diagram . . . . . . . . . . . . . . . . . . . . . . 2
5 Pinning information. . . . . . . . . . . . . . . . . . . . . . 5
5.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5
6 Functional description . . . . . . . . . . . . . . . . . . . 6
7 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 6
8 Recommended operating conditions. . . . . . . . 7
9 Static characteristics. . . . . . . . . . . . . . . . . . . . . 7
10 Dynamic characteristics . . . . . . . . . . . . . . . . . . 9
11 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
12 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 16
13 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . 19
14 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 19
15 Legal information. . . . . . . . . . . . . . . . . . . . . . . 20
15.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 20
15.2 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
15.3 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 20
15.4 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 20
16 Contact information. . . . . . . . . . . . . . . . . . . . . 20
17 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
