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74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
Rev. 03 -- 24 July 2008 Product data sheet
1. General description
74HC423; 74HCT423 are high-speed Si-gate CMOS devices that are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74HC423; 74HCT423 dual retriggerable monostable multivibrator with reset has two methods of output pulse width control. 1. The minimum pulse width is essentially determined by the selection of an external resistor (REXT) and capacitor (CEXT), see Section 12.1. 2. 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. When nRD is LOW, it forces the nQ output LOW, the nQ output HIGH and also inhibits the triggering. Figure 10 and Figure 11 illustrate pulse control by reset. The nA and nB inputs' Schmitt trigger action makes them highly tolerant to slower input rise and fall times. The 74HC423; 74HCT423 are identical to the 74HC123; 74HCT123 except that they cannot be triggered via the reset input.
2. Features
I I I I I I 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 Complies with JEDEC standard no. 7A ESD protection: N HBM JESD22-A114E exceeds 2000 V N MM JESD22-A115-A exceeds 200 V I Specified from -40 C to +85 C and from -40 C to +125 C
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
3. Ordering information
Table 1. Ordering information Temperature range Name 74HC423N 74HCT423N 74HC423D 74HCT423D 74HC423BQ 74HCT423BQ 74HCT423DB -40 C to +125 C 74HCT423PW -40 C to +125 C -40 C to +125 C -40 C to +125 C SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1 -40 C to +125 C DIP16 Description plastic dual in-line package; 16 leads (300 mil) Version SOT38-4 Type number Package
DHVQFN16 plastic dual in-line compatible thermal enhanced very thin SOT763-1 quad flat package; no leads; 16 terminals; body 2.5 x 3.5 x 0.85 mm SSOP16 TSSOP16 plastic shrink small outline package; 16 leads; body width 5.3 mm plastic thin shrink small outline package; 16 leads; body width 4.4 mm SOT338-1 SOT403-1
4. Functional diagram
14 15 S Q 1A 1 T 2 RD 3 6 7 S Q 2A 9 T 10 RD 11
001aah796
1CEXT 1REXT/CEXT
13
1Q
Q
4
1Q
1B 1RD
2CEXT 2REXT/CEXT
5
2Q
Q
12
2Q
2B 2RD
Fig 1.
Functional Diagram
74HC_HCT423_3
(c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
2 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
14 15 1 1CEXT 14 2CEXT 6 3 1REXT/CEXT 15 2REXT/CEXT S Q 1 1A 9 2A 2 1B 10 2B 3 1RD 11 2RD T Q RD 1Q 4 9 10 11
001aah797
CX RCX & 4 R 13
2
7 6 7
1Q 13 2Q 5
CX RCX & 12 R
001aah798
5
2Q 12
Fig 2.
Logic symbol
Fig 3.
IEC Logic symbol
REXT/CEXT VCC
RD R CL VCC VCC R CL
Q Q
CL
001aah799
A
CL
CL
B
Fig 4.
Logic diagram
74HC_HCT423_3
(c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
3 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
5. Pinning information
5.1 Pinning
74HC423 74HCT423
terminal 1 index area 1B 16 VCC 15 1REXT/CEXT 14 1CEXT 13 1Q 12 2Q 11 2RD 10 2B 9
001aah785
74HC423 74HCT423
1A 1B 1RD 1Q 2Q 2CEXT 2REXT/CEXT GND 1 2 3 4 5 6 7 8
2 3 4 5 6 7 8 GND 2A 9 VCC
(1)
16 VCC 15 1REXT/CEXT 14 1CEXT 13 1Q 12 2Q 11 2RD 10 2B
1RD 1Q 2Q 2CEXT 2REXT/CEXT
1
1A
2A
001aah784
Transparent top view
(1) The die substrate is attached to this pad using a conductive die attach material. It cannot be used as supply pin or input
Fig 5.
Pin configuration DIP16, SO16 and (T)SSOP16
Fig 6.
Pin configuration DHVQFN16
5.2 Pin description
Table 2. Symbol 1A, 2A 1B, 2B 1RD, 2RD 1Q, 2Q GND 1Q, 2Q 1CEXT, 2CEXT 1REXT/CEXT, 2REXT/CEXT VCC Pin description Pin 1, 9 2, 10 3, 11 4, 12 8 13, 5 14, 6 15, 7 16 Description trigger input (negative edge triggered) trigger input (positive edge triggered) direct reset (active LOW) output (active LOW) ground (0 V) output (active HIGH) external capacitor connection external resistor/capacitor connection supply voltage
74HC_HCT423_3
(c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
4 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
6. Functional description
Table 3. Input nRD L X X H H
[1]
Function table[1] Output nA X H X L nB X X L H nQ L L[2] L[2] nQ H H[2] H[2]
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
Table 4. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V). Symbol VCC IIK IOK IO ICC IGND Tstg Ptot Parameter supply voltage input clamping current output clamping current output current supply current ground current storage temperature total power dissipation DIP16 package SO16, SSOP16, TSSOP16 and DHVQFN16 packages
[1] [2] [3]
[2] [3]
Conditions VI < -0.5 V or VI > VCC + 0.5 V VO < -0.5 V or VO > VCC + 0.5 V -0.5 V < VO < VCC + 0.5 V
[1] [1]
Min -0.5 -50 -65 -
Max +7 20 20 25 50 +150 750 500
Unit V mA mA mA mA mA C mW mW
The input and output voltage ratings may be exceeded if the input and output current ratings are observed. For DIP16 packages: above 70 C the value of Ptot derates linearly at 12 mW/K. For SO16 packages: above 70 C the value of Ptot derates linearly at 8 mW/K; For SSOP16 and TSSOP16 packages: above 60 C the value of Ptot derates linearly at 5.5 mW/K; For DHVQFN16 packages: above 60 C the value of Ptot derates linearly at 4.5 mW/K.
74HC_HCT423_3
(c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
5 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
8. Recommended operating conditions
Table 5. Recommended operating conditions Voltages are referenced to GND (ground = 0 V). Symbol Parameter VCC VI VO Tamb t/V supply voltage input voltage output voltage ambient temperature input transition rise and fall rate VCC = 2.0 V VCC = 4.5 V VCC = 6.0 V Conditions Min 2.0 0 0 -40 74HC423 Typ 5.0 1.67 Max 6.0 VCC VCC +125 625 139 83 Min 4.5 0 0 -40 74HCT423 Typ 5.0 1.67 Max 5.5 VCC VCC +125 139 V V V C ns/V ns/V ns/V Unit
9. Static characteristics
Table 6. Static characteristics At recommended operating conditions; voltages are referenced to GND (ground = 0 V). Symbol Parameter Conditions Min 74HC423 VIH HIGH-level input voltage VCC = 2.0 V VCC = 4.5 V VCC = 6.0 V VIL LOW-level input voltage VCC = 2.0 V VCC = 4.5 V VCC = 6.0 V VOH HIGH-level output voltage VI = VIH or VIL IO = -20 A; VCC = 2.0 V IO = -20 A; VCC = 4.5 V IO = -20 A; VCC = 6.0 V IO = -4.0 mA; VCC = 4.5 V IO = -5.2 mA; VCC = 6.0 V VOL LOW-level output voltage VI = VIH or VIL IO = 20 A; VCC = 2.0 V IO = 20 A; VCC = 4.5 V IO = 20 A; VCC = 6.0 V IO = 4.0 mA; VCC = 4.5 V IO = 5.2 mA; VCC = 6.0 V II ICC input leakage current supply current VI = VCC or GND; VCC = 6.0 V VI = VCC or GND; IO = 0 A; VCC = 6.0 V 0 0 0 0.15 0.16 0.1 0.1 0.1 0.26 0.26 0.1 8.0 0.1 0.1 0.1 0.33 0.33 1.0 80 0.1 0.1 0.1 0.4 0.4 V V V V V 1.9 4.4 5.9 3.98 5.48 2.0 4.5 6.0 4.32 5.81 1.9 4.4 5.9 3.84 5.34 1.9 4.4 5.9 3.7 5.2 V V V V V 1.5 3.15 4.2 1.2 2.4 3.2 0.8 2.1 2.8 0.5 1.35 1.8 1.5 3.15 4.2 0.5 1.35 1.8 1.5 3.15 4.2 0.5 1.8 V V V V V 25 C Typ Max -40 C to +85 C Min Max -40 C to +125 C Min Max Unit
1.35 V
1.0 A 160 A
74HC_HCT423_3
(c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
6 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
Table 6. Static characteristics ...continued At recommended operating conditions; voltages are referenced to GND (ground = 0 V). Symbol Parameter Conditions Min CI 74HCT423 VIH VIL VOH HIGH-level input voltage LOW-level input voltage HIGH-level output voltage VCC = 4.5 V to 5.5 V VCC = 4.5 V to 5.5 V VI = VIH or VIL; VCC = 4.5 V IO = -20 A IO = -4.0 mA VOL LOW-level output VI = VIH or VIL; VCC = 4.5 V voltage IO = 20 A IO = 4.0 mA II ICC ICC input leakage current supply current additional supply current VI = VCC or GND; VCC = 5.5 V VI = VCC or GND; VCC = 5.5 V; IO = 0 A per input pin; VI = VCC - 2.1 V; other inputs at VCC or GND; VCC = 4.5 V to 5.5 V; IO = 0 A nA, nB inputs nRD input CI input capacitance 35 50 3.5 126 180 158 225 172 245 A A pF 4.4 3.98 4.5 4.32 0 0.15 0.1 0.26 0.1 8.0 4.4 3.84 0.1 0.33 1.0 80 4.4 3.7 0.1 0.4 V V V V 2.0 1.6 1.2 0.8 2.0 0.8 2.0 0.8 V V input capacitance 25 C Typ 3.5 Max -40 C to +85 C Min Max -40 C to +125 C Min Max pF Unit
1.0 A 160 A
74HC_HCT423_3
(c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
7 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
10. Dynamic characteristics
Table 7. Dynamic characteristics GND = 0 V; test circuit see Figure 12. Symbol Parameter Conditions Min 74HC423 tpd propagation delay nA or nB to nQ or nQ; REXT = 5 k; CEXT = 0 pF; see Figure 7 VCC = 2.0 V VCC = 4.5 V VCC = 5.0 V; CL = 15 pF VCC = 6.0 V nRD to nQ or nQ; see Figure 7 VCC = 2.0 V VCC = 4.5 V VCC = 5.0 V; CL = 15 pF VCC = 6.0 V tt transition time see Figure 7 VCC = 2.0 V VCC = 4.5 V VCC = 6.0 V tW pulse width nA input LOW; see Figure 7 and Figure 8 VCC = 2.0 V VCC = 4.5 V VCC = 6.0 V nB input HIGH; see Figure 7 and Figure 8 VCC = 2.0 V VCC = 4.5 V VCC = 6.0 V nRD input LOW; see Figure 7 and Figure 8 VCC = 2.0 V VCC = 4.5 V VCC = 6.0 V nQ HIGH or nQ LOW; VCC = 5.0 V; REXT = 10 k; CEXT = 100 nF; see Figure 7 and Figure 8 nQ HIGH or nQ LOW; VCC = 5.0 V; REXT = 5 k; CEXT = 0 pF; VI = GND to VCC; see Figure 7 and Figure 8 trtrig retrigger time nA or nB input; VCC = 5.0 V; REXT = 5 k; CEXT = 0 pF; see Figure 10
[3] [2] [1] [1]
25 C Typ
-40 C to +85 C
-40 C to Unit +125 C
Max Min Max Min Max
100 20 17 100 20 17 100 20 17 -
80 29 25 23 66 24 20 19 19 7 6 11 4 3 17 6 5 14 5 4 450
255 51 43 215 43 37 75 15 13 -
125 25 21 125 25 21 125 25 21 -
320 64 54 270 54 46 95 19 16 -
150 30 26 150 30 26 150 30 26 -
385 ns 77 65 ns ns ns
325 ns 65 55 ns ns ns
110 ns 22 19 ns ns ns ns ns ns ns ns ns ns ns s
-
75
-
-
-
-
-
ns
[4]
-
110
-
-
-
-
-
ns
74HC_HCT423_3
(c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
8 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
Table 7. Dynamic characteristics ...continued GND = 0 V; test circuit see Figure 12. Symbol Parameter Conditions Min REXT CEXT CPD external timing VCC = 2.0 V; see Figure 8 resistor VCC = 5.0 V external timing VCC = 5.0 V; see Figure 8 capacitor power dissipation capacitance propagation delay per package; VI = GND to VCC
[5]
25 C Typ -
-40 C to +85 C 1000 1000 -
-40 C to Unit +125 C k k pF
Max Min Max Min Max
10 2
no limits 54 -
[6]
pF
74HCT423 tpd nA or nB to nQ or nQ; REXT = 5 k; CEXT = 0 pF; see Figure 7 VCC = 4.5 V VCC = 5.0 V; CL = 15 pF nRD to nQ or nQ; REXT = 5 k; CEXT = 0 pF; see Figure 7 VCC = 4.5 V VCC = 5.0 V; CL = 15 pF tt tW transition time pulse width VCC = 4.5 V; Figure 7 trigger pulse; nA input LOW; VCC = 4.5 V; see Figure 7 and Figure 10 trigger pulse; nB input HIGH; VCC = 4.5 V; see Figure 7 and Figure 10 reset pulse; nRD input LOW; VCC = 4.5 V; see Figure 7 and Figure 11 output pulse; nQ HIGH or nQ LOW; VCC = 5.0 V; REXT = 10 k; CEXT = 100 nF; see Figure 7, Figure 10 and Figure 11 output pulse; nQ HIGH or nQ LOW; VCC = 5.0 V; REXT = 5 k; CEXT = 0 pF; VI = GND to VCC - 1.5 V; see Figure 7, Figure 10 and Figure 11 trtrig REXT CEXT retrigger time nA or nB input; VCC = 5.0 V; REXT = 5 k; CEXT = 0 pF; see Figure 10
[3] [1] [1] [1]
20 20 20 -
30 26 26 26 22 7 5 5 7 450
51 48 48 15 -
25 25 25 -
64 60 60 19 -
30 30 30 -
77 72 72 22 -
ns ns ns ns ns ns ns ns ns s
[1] [1] [2]
-
75
-
-
-
-
-
ns
2
[5]
110 -
1000
-
-
-
-
ns k pF
external timing VCC = 5.0 V; see Figure 8 resistor external timing VCC = 5.0 V; see Figure 8 capacitor
no limits
74HC_HCT423_3
(c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
9 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
Table 7. Dynamic characteristics ...continued GND = 0 V; test circuit see Figure 12. Symbol Parameter Conditions Min CPD power dissipation capacitance per package; VI = GND to VCC - 1.5 V
[6]
25 C Typ 56
-40 C to +85 C -
-40 C to Unit +125 C pF
Max Min Max Min Max
-
[1] [2] [3]
tpd is the same as tPHL and tPLH. tt is the same as tTHL and tTLH. For other REXT and CEXT combinations see Figure 8. If CEXT > 10 pF, the next formula is valid: tW = K x REXT x CEXT (typ.), where: tW = output pulse width in ns; REXT = external resistor in k; CEXT = external capacitor in pF; K = 0.55 for VCC = 2.0 V and 0.45 for VCC = 5.0 V; see Figure 9. Inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 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 input pulses meets the minimum retrigger time. If CEXT > 10 pF, the next formula (at VCC = 5.0 V) for the set-up time of a retrigger pulse is valid: trtrig = 30 + 0.19 x REXT x CEXT0.9 + 13 x REXT1.05 (typ.); where: trtrig = retrigger time in ns; CEXT = external capacitor in pF; REXT = external resistor in k. Inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 7 pF. When the device is powered-up, initiate the device via a reset pulse, when CEXT < 50 pF. CPD is used to determine the dynamic power dissipation (PD in W): PD = CPD x VCC2 x fi x N + (CL x VCC2 x fo); 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; (CL x VCC2 x fo) = sum of outputs.
[4]
[5] [6]
74HC_HCT423_3
(c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
10 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
11. Waveforms
VI nB input GND tW VI nA input GND tW tW VI nRD input GND tPLH VOH Q output VOL tPHL VOH Q output VOL tW tTHL VM VX VM VX tW tTLH tPHL VY tTHL tPLH (reset) tPHL tPLH VY tPHL (reset) tPLH VM VM VM
tTLH
001aah911
Measurement points are given in Table 8. VOL and VOH are typical voltage output levels that occur with the output load.
Fig 7.
Pulse widths, propagation delays from inputs (nA, nB, nRD) to outputs (nQ, nQ) and output transition times Measurement points Input VI VM 0.5VCC 1.3 V VCC 3V Output VM 0.5VCC 1.3 V VX 0.1VCC 0.1VCC VY 0.9VCC 0.9VCC
Table 8. Type 74HC423 74HCT423
74HC_HCT423_3
(c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
11 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
106 tW (ns) 105
001aaa611
0.8 'K' factor
001aaa612
(1) (2) (3)
0.6
104
(4)
0.4
103
0.2 102
10 1 10
102
104 103 CEXT (pF)
0 0 2 4 6 VCC (V) 8
VCC = 5.0 V and Tamb = 25 C. (1) REXT = 100 k. (2) REXT = 50 k. (3) REXT = 10 k. (4) REXT = 2 k.
External capacitance = 10 nF, external resistance = 10 k to 100 k and Tamb = 25 C.
Fig 8.
Typical output pulse width as a function of the external capacitor values
Fig 9.
Typical `K' factor
nB input tW nA input
t rt
tW
nQ output
tW tW
tW
mna521
nRD = HIGH.
Fig 10. Output pulse control using retrigger pulse (trtrig)
74HC_HCT423_3
(c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
12 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
nB input
nRD input tW
nQ output
tW
tW
mna522
nA = LOW.
Fig 11. Output pulse control using reset input nRD
VI negative pulse GND
tW 90 % VM 10 % tf tr tr tf 90 % VM 10 % tW VCC G
VI VO
VM
VI positive pulse GND
VM
DUT
RT CL
001aah768
Test data is given in Table 9. Definitions for test circuit: RT = Termination resistance should be equal to output impedance Zo of the pulse generator. CL = Load capacitance including jig and probe capacitance.
Fig 12. Test circuit for measuring switching times Table 9. Supply VCC 2.0 V to 6.0 V Test data Input VI VCC tr, tf 6 ns Load CL 15 pF, 50 pF
74HC_HCT423_3
(c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
13 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
12. Application information
12.1 Timing component connections
The basic output pulse width is essentially determined by the values of the external timing components REXT and CEXT.
CEXT
(1)
REXT
VCC nCEXT 14 (6) nREXT/CEXT 15 (7) 13 (5) nQ
GND 8
423
nA nB 1 (9) 2 (10)
4 (12)
nQ
3 (11) nRD
001aah917
(1) For minimum noise generation it is recommended that the nCEXT pins (6, 14) are connected to ground externally to the GND pin (8).
Fig 13. Timing component connections
12.1.1 Minimum monostable pulse width
To set the minimum pulse width, when CEXT < 10 nF, see Figure 8 and when CEXT > 10 nF, the output pulse width is defined as: tW = 0.45 x REXT x CEXT (typ.), where: tW = pulse width in s; REXT = external resistor in k; CEXT = external capacitor in nF.
12.2 Power-up considerations
When the monostable 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 circuit shown in Figure 14.
74HC_HCT423_3
(c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
14 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
CEXT
REXT
VCC GND 8 nCEXT 14 (6) nREXT/CEXT 15 (7) 13 (5) nQ
423
nA nB 1 (9) 2 (10)
4 (12)
nQ
3 (11) nRD RESET VCC
001aah918
Fig 14. Power-up output pulse elimination circuit
12.3 Power-down considerations
A large capacitor CEXT may cause problems when powering-down the monostable due to the capacitor's stored energy. When a system containing this device is powered-down or a rapid 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, use a damping diode DEXT preferably a germanium or Schottky type diode able to withstand large current surges and connect as shown in Figure 15.
DEXT
CEXT
REXT
VCC GND 8 nCEXT 14 (6) nREXT/CEXT 15 (7) 13 (5) nQ
423
nA nB 1 (9) 2 (10)
4 (12)
nQ
3 (11)
001aah919
nRD
Fig 15. Power-down protection circuit
74HC_HCT423_3
(c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
15 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
13. Package outline
DIP16: plastic dual in-line package; 16 leads (300 mil) SOT38-4
D seating plane
ME
A2
A
L
A1
c Z e b1 b 16 9 b2 MH wM (e 1)
pin 1 index E
1
8
0
5 scale
10 mm
DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT mm inches A max. 4.2 0.17 A1 min. 0.51 0.02 A2 max. 3.2 0.13 b 1.73 1.30 0.068 0.051 b1 0.53 0.38 0.021 0.015 b2 1.25 0.85 0.049 0.033 c 0.36 0.23 0.014 0.009 D (1) 19.50 18.55 0.77 0.73 E (1) 6.48 6.20 0.26 0.24 e 2.54 0.1 e1 7.62 0.3 L 3.60 3.05 0.14 0.12 ME 8.25 7.80 0.32 0.31 MH 10.0 8.3 0.39 0.33 w 0.254 0.01 Z (1) max. 0.76 0.03
Note 1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included. OUTLINE VERSION SOT38-4 REFERENCES IEC JEDEC JEITA EUROPEAN PROJECTION
ISSUE DATE 95-01-14 03-02-13
Fig 16. Package outline SOT38-4 (DIP16)
74HC_HCT423_3 (c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
16 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
SO16: plastic small outline package; 16 leads; body width 3.9 mm
SOT109-1
D
E
A X
c y HE vMA
Z 16 9
Q A2 pin 1 index Lp 1 e bp 8 wM L detail X A1 (A 3) A
0
2.5 scale
5 mm
DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT mm inches A max. 1.75 A1 0.25 0.10 A2 1.45 1.25 A3 0.25 0.01 bp 0.49 0.36 c 0.25 0.19 D (1) 10.0 9.8 E (1) 4.0 3.8 0.16 0.15 e 1.27 0.05 HE 6.2 5.8 L 1.05 Lp 1.0 0.4 0.039 0.016 Q 0.7 0.6 0.028 0.020 v 0.25 0.01 w 0.25 0.01 y 0.1 Z (1) 0.7 0.3
0.010 0.057 0.069 0.004 0.049
0.019 0.0100 0.39 0.014 0.0075 0.38
0.244 0.041 0.228
0.028 0.004 0.012
8 o 0
o
Note 1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included. OUTLINE VERSION SOT109-1 REFERENCES IEC 076E07 JEDEC MS-012 JEITA EUROPEAN PROJECTION
ISSUE DATE 99-12-27 03-02-19
Fig 17. Package outline SOT109-1 (SO16)
74HC_HCT423_3 (c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
17 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
DHVQFN16: plastic dual in-line compatible thermal enhanced very thin quad flat package; no leads; SOT763-1 16 terminals; body 2.5 x 3.5 x 0.85 mm
D
B
A
A A1 E c
terminal 1 index area
detail X
terminal 1 index area e 2 L
e1 b 7 vMCAB wM C y1 C
C y
1 Eh 16
8 e 9
15 Dh
10 X 2.5 scale 5 mm
0
DIMENSIONS (mm are the original dimensions) UNIT mm A(1) max. 1 A1 0.05 0.00 b 0.30 0.18 c 0.2 D (1) 3.6 3.4 Dh 2.15 1.85 E (1) 2.6 2.4 Eh 1.15 0.85 e 0.5 e1 2.5 L 0.5 0.3 v 0.1 w 0.05 y 0.05 y1 0.1
Note 1. Plastic or metal protrusions of 0.075 mm maximum per side are not included. OUTLINE VERSION SOT763-1 REFERENCES IEC --JEDEC MO-241 JEITA --EUROPEAN PROJECTION ISSUE DATE 02-10-17 03-01-27
Fig 18. Package outline SOT763-1 (DHVQFN16)
74HC_HCT423_3 (c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
18 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm
SOT338-1
D
E
A X
c y HE vM A
Z 16 9
Q A2 A1 pin 1 index Lp L 1 bp 8 wM detail X (A 3) A
e
0
2.5 scale
5 mm
DIMENSIONS (mm are the original dimensions) UNIT mm A max. 2 A1 0.21 0.05 A2 1.80 1.65 A3 0.25 bp 0.38 0.25 c 0.20 0.09 D (1) 6.4 6.0 E (1) 5.4 5.2 e 0.65 HE 7.9 7.6 L 1.25 Lp 1.03 0.63 Q 0.9 0.7 v 0.2 w 0.13 y 0.1 Z (1) 1.00 0.55 8 o 0
o
Note 1. Plastic or metal protrusions of 0.25 mm maximum per side are not included. OUTLINE VERSION SOT338-1 REFERENCES IEC JEDEC MO-150 JEITA EUROPEAN PROJECTION
ISSUE DATE 99-12-27 03-02-19
Fig 19. Package outline SOT338-1 (SSOP16)
74HC_HCT423_3 (c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
19 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm
SOT403-1
D
E
A
X
c y HE vMA
Z
16
9
Q A2 pin 1 index A1 Lp L (A 3) A
1
e bp
8
wM detail X
0
2.5 scale
5 mm
DIMENSIONS (mm are the original dimensions) UNIT mm A max. 1.1 A1 0.15 0.05 A2 0.95 0.80 A3 0.25 bp 0.30 0.19 c 0.2 0.1 D (1) 5.1 4.9 E (2) 4.5 4.3 e 0.65 HE 6.6 6.2 L 1 Lp 0.75 0.50 Q 0.4 0.3 v 0.2 w 0.13 y 0.1 Z (1) 0.40 0.06 8 o 0
o
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. OUTLINE VERSION SOT403-1 REFERENCES IEC JEDEC MO-153 JEITA EUROPEAN PROJECTION ISSUE DATE 99-12-27 03-02-18
Fig 20. Package outline SOT403-1 (TSSOP16)
74HC_HCT423_3 (c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
20 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
14. Abbreviations
Table 10. Acronym CMOS DUT ESD HBM MM TTL Abbreviations Description Complementary Metal Oxide Semiconductor Device Under Test ElectroStatic Discharge Human Body Model Machine Model Transistor-Transistor Logic
15. Revision history
Table 11. Revision history Release date 20080724 Data sheet status Product data sheet Change notice Supersedes 74HC_HCT423_CNV_2 Document ID 74HC_HCT423_3 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 "Ordering information", Section 5 "Pinning information"and Section 13 "Package outline", added type numbers 74HC423BQ and 74HCT423BQ (DHVQFN16 package). Figure 4 "Logic diagram", Figure 13 "Timing component connections" and Figure 15 "Power-down protection circuit" redrawn. Section 10 "Dynamic characteristics" CPD values added. Figure 12 "Test circuit for measuring switching times" added. Section 12.1 "Timing component connections" moved to Section 12. Section 14 "Abbreviations" added. Product specification -
74HC_HCT423_CNV_2
19980708
74HC_HCT423_3
(c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
21 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
16. Legal information
16.1 Data sheet status
Document status[1][2] Objective [short] data sheet Preliminary [short] data sheet Product [short] data sheet
[1] [2] [3]
Product status[3] Development Qualification Production
Definition This document contains data from the objective specification for product development. This document contains data from the preliminary specification. This document contains the product specification.
Please consult the most recently issued document before initiating or completing a design. The term `short data sheet' is explained in section "Definitions". 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.
16.2 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.
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.
16.3 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
16.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners.
17. Contact information
For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com
74HC_HCT423_3
(c) NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 -- 24 July 2008
22 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
18. Contents
1 2 3 4 5 5.1 5.2 6 7 8 9 10 11 12 12.1 12.1.1 12.2 12.3 13 14 15 16 16.1 16.2 16.3 16.4 17 18 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Ordering information . . . . . . . . . . . . . . . . . . . . . 2 Functional diagram . . . . . . . . . . . . . . . . . . . . . . 2 Pinning information . . . . . . . . . . . . . . . . . . . . . . 4 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4 Functional description . . . . . . . . . . . . . . . . . . . 5 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 5 Recommended operating conditions. . . . . . . . 6 Static characteristics. . . . . . . . . . . . . . . . . . . . . 6 Dynamic characteristics . . . . . . . . . . . . . . . . . . 8 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Application information. . . . . . . . . . . . . . . . . . 14 Timing component connections . . . . . . . . . . . 14 Minimum monostable pulse width. . . . . . . . . . 14 Power-up considerations . . . . . . . . . . . . . . . . 14 Power-down considerations . . . . . . . . . . . . . . 15 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 16 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Revision history . . . . . . . . . . . . . . . . . . . . . . . . 21 Legal information. . . . . . . . . . . . . . . . . . . . . . . 22 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 22 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Contact information. . . . . . . . . . . . . . . . . . . . . 22 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Please be aware that important notices concerning this document and the product(s) described herein, have been included in section `Legal information'.
(c) 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: 24 July 2008 Document identifier: 74HC_HCT423_3

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