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INTEGRATED CIRCUITS
DATA SHEET
For a complete data sheet, please also download:
* The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications * The IC06 74HC/HCT/HCU/HCMOS Logic Package Information * The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT423 Dual retriggerable monostable multivibrator with reset
Product specification Supersedes data of December 1990 File under Integrated Circuits, IC06 1998 Jul 08
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator with reset
FEATURES * 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 * Output capability: standard (except for nREXT/CEXT) * ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT423 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 74HC/HCT423 are dual retriggerable monostable multivibrators with output pulse width control by two methods. The basic pulse time is programmed by selection of an external resistor (REXT) and capacitor
74HC/HCT423
(CEXT). The external resistor and capacitor are normally connected as shown in Fig.6. 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. Figures 7 and 8 illustrate pulse control by reset. The basic output pulse width is essentially determined by the values of the external timing components REXT and CEXT. For pulse widths, when CEXT < 10 000 pF, see Fig.9. When CEXT > 10 000 pF, the typical output pulse width is defined as: tW = 0.45 x REXT x CEXT (typ.), where, tW = pulse width in ns; REXT = external resistor in k; CEXT = external capacitor in pF. Schmitt-trigger action in the nA and nB inputs, makes the circuit highly tolerant to slower input rise and fall times. The "423" is identical to the "123" but cannot be triggered via the reset input.
QUICK REFERENCE DATA GND = 0 V; Tamb = 25 C; tr = tf = 6 ns SYMBOL tPHL/ tPLH PARAMETER propagation delay nA, nB to nQ, nQ nRD to nQ, nQ CI tW Notes input capacitance minimum output pulse width nQ, nQ
TYPICAL CONDITIONS HC CL = 15 pF; VCC = 5 V; REXT = 5 k; CEXT = 0 pF 25 20 3.5 notes 1 and 2 75 26 22 3.5 75 HCT ns ns pF ns UNIT
1. CPD is used to determine the dynamic power dissipation (PD in W): PD = CPD x VCC2 x fi + (CL x VCC2 x fo) + 0.75 x CEXT x VCC2 x fo + D x 16 x VCC where: fi = input frequency in MHz fo = output frequency in MHz D = duty factor in % (CL x VCC2 x fo) = sum of outputs CL = output load capacitance in pF VCC = supply voltage in V CEXT = timing capacitance in pF 2. For HC the condition is VI = GND to VCC For HCT the condition is VI = GND to VCC - 1.5 V
1998 Jul 08
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Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator with reset
ORDERING INFORMATION TYPE NUMBER 74HC423N; 74HCT423N 74HC423D; 74HCT423D PIN DESCRIPTION PIN NO. 1, 9 2, 10 3, 11 4, 12 7 8 13, 5 14, 6 15 16 SYMBOL 1A, 2A 1B, 2B 1RD, 2RD 1Q, 2Q 2REXT/CEXT GND 1Q, 2Q 1CEXT, 2CEXT 1REXT/CEXT VCC NAME AND FUNCTION trigger inputs (negative-edge triggered) trigger inputs (positive-edge triggered) direct reset action (active LOW) outputs (active LOW) external resistor/capacitor connection ground (0 V) outputs (active HIGH) external capacitor connection external resistor/capacitor connection positive supply voltage PACKAGE NAME DIP16 SO16 DESCRIPTION plastic dual in-line package; 16 leads (300 mil); long body plastic small outline package; 16 leads; body width 3.9 mm; low stand-off height
74HC/HCT423
VERSION SOT38-1 SOT109-1
Fig.1 Pin configuration.
Fig.2
Fig.3 IEC logic symbol.
1998 Jul 08
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Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator with reset
74HC/HCT423
Fig.4 Functional diagram.
FUNCTION TABLE INPUTS nRD L X X H H Notes 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 was triggered before this condition was established, the pulse will continue as programmed. nA X H X L nB X X L H nQ L L(2) L(2) OUTPUTS nQ H H(2) H(2)
1998 Jul 08
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Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator with reset
74HC/HCT423
It is recommended to ground pins 6 (2CEXT) and 14 (1CEXT) externally to pin 8 (GND).
Fig.5 Logic diagram.
Fig.6 Timing component connections.
1998 Jul 08
5
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator with reset
DC CHARACTERISTICS FOR 74HC For the DC characteristics see "74HC/HCT/HCU/HCMOS Logic Family Specifications". Output capability: standard (except for nREXT /CEXT) ICC category: MSI AC CHARACTERISTICS FOR 74HC GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (C) 74HC SYMBOL PARAMETER +25 -40 to +85 -40 to +125 UNIT
74HC/HCT423
TEST CONDITIONS VCC (V) 2.0 4.5 6.0 ns 2.0 4.5 6.0 ns 2.0 4.5 6.0 ns 2.0 4.5 6.0 ns 2.0 4.5 6.0 ns 2.0 4.5 6.0 s 5.0 CEXT = 100 nF; REXT = 10 k; Figs 7 and 8 CEXT = 0 pF; REXT = 5 k; note 1; Figs 7 and 8 CEXT = 0 pF; REXT = 5 k; note 2; Fig. 7 Fig.9 Fig.9; note 3 Fig.8 Fig.7 Fig.7 CEXT = 0 pF; REXT = 5 k WAVEFORMS/ NOTES CEXT = 0 pF; REXT = 5 k
min. typ. max min max min. max. tPHL/ tPLH propagation delay nA, nB to nQ, nQ 80 29 23 tPHL/ tPLH propagation delay nRD to nQ, nQ output transition time 66 24 19 tTHL/ tTLH 19 7 6 tW trigger pulse width nA = LOW 100 20 17 tW trigger pulse width nB = HIGH 100 20 17 tW reset pulse width nRD = LOW output pulse width nQ = HIGH nQ = LOW output pulse width nQ = HIGH nQ = LOW retrigger time nA, nB external timing resistor external timing capacitor 10 2 no limits 6 100 20 17 tW 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 77 65 325 65 55 110 22 19 ns
tW
75
-
-
ns
5.0
trt
110
-
-
ns
5.0
REXT CEXT 1998 Jul 08
1000 - 1000
-
k pF
2.0 5.0 5.0
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator with reset
DC CHARACTERISTICS FOR 74HCT For the DC characteristics see "74HC/HCT/HCU/HCMOS Logic Family Specifications". Output capability: standard (except for nREXT/CEXT) ICC category: MSI Note to HCT types
74HC/HCT423
The value of additional quiescent supply current (ICC) for a unit load of 1 is given in the family specifications. To determine ICC per input, multiply this value by the unit load coefficient shown in the table below. INPUT nA, nB nRD UNIT LOAD COEFFICIENT 0.35 0.50
AC CHARACTERISTICS FOR 74HCT GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (C) 74HCT SYMBOL PARAMETER +25 -40 to +85 -40 to +125 UNIT VCC (V) 4.5 4.5 4.5 4.5 4.5 4.5 5.0 Fig.7 Fig.7 Fig.8 CEXT = 100 nF; REXT = 10 k; Figs 7 and 8 CEXT = 0 pF; REXT = 5 k; note 1; Figs 7 and 8 CEXT = 0 pF; REXT = 5 k; note 2; Fig.7 Fig.9 Fig.9; note 3 WAVEFORMS/ NOTES CEXT = 0 pF; REXT = 5 k CEXT = 0 pF; REXT = 5 k TEST CONDITIONS
min. typ. max. min. max. min. max. tPHL/ tPLH tPHL/ tPLH tTHL/ tTLH tW tW tW tW propagation delay nA, nB to nQ, nQ propagation delay nRD to nQ, nQ output transition time trigger pulse width nA = LOW trigger pulse width nB = HIGH reset pulse width nRD = LOW output pulse width nQ = HIGH nQ = LOW output pulse width nQ = HIGH nQ = LOW retrigger time nA, nB external timing resistor external timing capacitor 2 no limits 20 20 20 30 26 7 5 5 7 450 51 48 15 25 25 25 - 64 60 19 30 30 30 - 77 72 22 ns ns ns ns ns ns s
tW
75
-
-
ns
5.0
trt
110
-
-
ns
5.0
REXT CEXT
1000 -
-
k pF
5.0 5.0
1998 Jul 08
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Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator with reset
Notes
74HC/HCT423
1. For other REXT and CEXT combinations see Fig.9. 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 = constant = 0.45 for VCC = 5.0 V and 0.55 for VCC = 2.0 V. The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF. 2. 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: trt = 30 + 0.19 x REXT x CEXT0.9 + 13 x REXT1.05 (typ.) where, trt = retrigger time in ns; CEXT = external capacitor in pF; REXT = external resistor in k. The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 7 pF. 3. When the device is powered-up, initiate the device via a reset pulse, when CEXT < 50 pF. AC WAVEFORMS
Fig.7 Output pulse control using retrigger pulse; nRD = HIGH.
Fig.8 Output pulse control using reset input nRD; nA = LOW.
1998 Jul 08
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Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator with reset
74HC/HCT423
Fig.9
Typical output pulse width as a function of the external capacitor values at VCC = 5.0 V and Tamb = 25 C.
Fig.10 Typical `K' factor; external capacitance = 10 nF, external resistance = 10 k to 100 k and Tamb = 25 C.
1998 Jul 08
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Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator with reset
APPLICATION INFORMATION Power-up considerations
74HC/HCT423
When the monostable is powered-up it may produce an output pulse, with a pulse width defined by the values of RX and CX, this output pulse can be eliminated using the circuit shown in Fig.11.
Fig.11 Power-up output pulse elimination circuit.
Power-down considerations A large capacitor (CX) may cause problems when powering-down the monostable due to the energy stored in this capacitor. When a system containing this device is powered-down or a rapid decrease of VCC to zero occurs, the monostable may substain damage, due to the capacitor discharging through the input protection diodes. To avoid this possibility, use a damping diode (DX) preferably a germanium or Schottky-type diode able to withstand large current surges and connect as shown in Fig.12.
Fig.12 Power-down protection circuit.
1998 Jul 08
10
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator with reset
PACKAGE OUTLINES DIP16: plastic dual in-line package; 16 leads (300 mil); long body
74HC/HCT423
SOT38-1
D seating plane
ME
A2
A
L
A1
c Z e b1 b 16 9 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. 4.7 0.19 A1 min. 0.51 0.020 A2 max. 3.7 0.15 b 1.40 1.14 0.055 0.045 b1 0.53 0.38 0.021 0.015 c 0.32 0.23 0.013 0.009 D (1) 21.8 21.4 0.86 0.84 E (1) 6.48 6.20 0.26 0.24 e 2.54 0.10 e1 7.62 0.30 L 3.9 3.4 0.15 0.13 ME 8.25 7.80 0.32 0.31 MH 9.5 8.3 0.37 0.33 w 0.254 0.01 Z (1) max. 2.2 0.087
Note 1. Plastic or metal protrusions of 0.25 mm maximum per side are not included. OUTLINE VERSION SOT38-1 REFERENCES IEC 050G09 JEDEC MO-001AE EIAJ EUROPEAN PROJECTION
ISSUE DATE 92-10-02 95-01-19
1998 Jul 08
11
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator with reset
74HC/HCT423
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 A1 pin 1 index Lp 1 e bp 8 wM L detail X (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 0.069 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 0.050 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 0.004 Z (1) 0.7 0.3 0.028 0.012
0.010 0.057 0.004 0.049
0.019 0.0100 0.39 0.014 0.0075 0.38
0.244 0.041 0.228
8 0o
o
Note 1. Plastic or metal protrusions of 0.15 mm maximum per side are not included. OUTLINE VERSION SOT109-1 REFERENCES IEC 076E07S JEDEC MS-012AC EIAJ EUROPEAN PROJECTION
ISSUE DATE 95-01-23 97-05-22
1998 Jul 08
12
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator with reset
SOLDERING Introduction There is no soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. However, wave soldering is not always suitable for surface mounted ICs, or for printed-circuits with high population densities. In these situations reflow soldering is often used. This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in our "Data Handbook IC26; Integrated Circuit Packages" (order code 9398 652 90011). DIP SOLDERING BY DIPPING OR BY WAVE The maximum permissible temperature of the solder is 260 C; solder at this temperature must not be in contact with the joint for more than 5 seconds. The total contact time of successive solder waves must not exceed 5 seconds. The device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the specified maximum storage temperature (Tstg max). If the printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit. REPAIRING SOLDERED JOINTS Apply a low voltage soldering iron (less than 24 V) to the lead(s) of the package, below the seating plane or not more than 2 mm above it. If the temperature of the soldering iron bit is less than 300 C it may remain in contact for up to 10 seconds. If the bit temperature is between 300 and 400 C, contact may be up to 5 seconds. SO REFLOW SOLDERING Reflow soldering techniques are suitable for all SO packages. Reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen printing, stencilling or pressure-syringe dispensing before package placement.
74HC/HCT423
Several techniques exist for reflowing; for example, thermal conduction by heated belt. Dwell times vary between 50 and 300 seconds depending on heating method. Typical reflow temperatures range from 215 to 250 C. Preheating is necessary to dry the paste and evaporate the binding agent. Preheating duration: 45 minutes at 45 C. WAVE SOLDERING Wave soldering techniques can be used for all SO packages if the following conditions are observed: * A double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. * The longitudinal axis of the package footprint must be parallel to the solder flow. * The package footprint must incorporate solder thieves at the downstream end. During placement and before soldering, the package must be fixed with a droplet of adhesive. The adhesive can be applied by screen printing, pin transfer or syringe dispensing. The package can be soldered after the adhesive is cured. Maximum permissible solder temperature is 260 C, and maximum duration of package immersion in solder is 10 seconds, if cooled to less than 150 C within 6 seconds. Typical dwell time is 4 seconds at 250 C. A mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. REPAIRING SOLDERED JOINTS Fix the component by first soldering two diagonallyopposite end leads. Use only a low voltage soldering iron (less than 24 V) applied to the flat part of the lead. Contact time must be limited to 10 seconds at up to 300 C. When using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 C.
1998 Jul 08
13
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator with reset
DEFINITIONS Data sheet status Objective specification Preliminary specification Product specification Limiting values
74HC/HCT423
This data sheet contains target or goal specifications for product development. This data sheet contains preliminary data; supplementary data may be published later. This data sheet contains final product specifications.
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale.
1998 Jul 08
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