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INTEGRATED CIRCUITS
74LV423 Dual retriggerable monostable multivibrator with reset
Product specification IC24 Data Handbook 1997 Feb 04
Philips Semiconductors
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator with reset
74LV423
FEATURES
* Optimized for Low Voltage applications: 1.0 to 5.5V * Accepts TTL input levels between VCC = 2.7V and VCC = 3.6V * Typical VOLP (output ground bounce) t 0.8V @ VCC = 3.3V, * Typical VOHV (output VOH undershoot) u 2V @ VCC = 3.3V, * DC triggered from active HIGH or active LOW inputs * Retriggerable for very long pulses up to 100% duty factor * Direct reset terminates output pulses * Schmitt-trigger action on all inputs except for the reset input * Output capability: standard (except for nREXT/CEXT) * ICC category: MSI
Tamb = 25C Tamb = 25C
DESCRIPTION
The 74LV423 is a low-voltage Si-gate CMOS device and is pin and function compatible with the 74HC/HCT423. The 74LV423 is a dual retriggerable monostable multivibrator with output pulse width control by three methods. The basic pulse time is programmed by selection of an external resistor (REXT) and capacitor (CEXT). They are normally connected as shown in Figure 1. Once triggered, the basic output pulse width may be extended by retriggering the gated active LOW-going edge input (nA) or the active HIGH-going edge input (nB). By repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be made as long as desired. Alternatively, an output delay can be terminated at any time by a LOW-going edge on input nRD, which also inhibits the triggering. Figures 2 and 3 illustrate pulse control by retriggering and early reset. The basic output pulse width is essentially determined by the values of the external timing components REXT and CEXT. For pulse width when CEXT <10000pF, see Figure 6. When CEXT u 10,000pF, the typical output pulse width is defined as: tW = 0.45 REXT CEXT (typ.), where tW = pulse width in ns; REXT = external resistor in K; and CEXT = external capacitor in pF. Schmitt-trigger action in the nA and nB inputs makes the circuit highly tolerant of slower input rise and fall times.
QUICK REFERENCE DATA
GND = 0V; Tamb = 25C; tr = tf v2.5 ns SYMBOL PARAMETER Propagation delay nA, nB to nQ, nQ nRD to nQ, nQ Input capacitance Power dissipation capacitance per flip-flop VCC = 3.3V, VI = GND to VCC1 CONDITIONS CL = 15pF VCC = 3.3V REXT = 5K CEXT = 0pF TYPICAL UNIT
tPHL/tPLH CI CPD
16 13 3.5 17
ns ns pF pF
NOTES: 1. CPD is used to determine the dynamic power dissipation (PD in W) VCC2 fi )S (CL VCC2 fo) where: PD = CPD fi = input frequency in MHz; CL = output load capacity in pF; fo = output frequency in MHz; VCC = supply voltage in V; VCC2 fo) = sum of the outputs. S (CL
ORDERING INFORMATION
PACKAGES 16-Pin Plastic DIL 16-Pin Plastic SO 16-Pin Plastic SSOP Type II 16-Pin Plastic TSSOP Type I TEMPERATURE RANGE -40C to +125C -40C to +125C -40C to +125C -40C to +125C OUTSIDE NORTH AMERICA 74LV423 N 74LV423 D 74LV423 DB 74LV423 PW NORTH AMERICA 74LV423 N 74LV423 D 74LV423 DB 74LV423PW DH PKG. DWG. # SOT38-1 SOT109-1 SOT338-1 SOT403-1
1997 Feb 04
2
853-1913 17724
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator with reset
74LV423
PIN CONFIGURATION
1A 1B 1RD 1Q 2Q 2CEXT 2REXT/CEXT GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC 1REXT/CEXT 1CEXT 1Q 2Q 2RD 2B 2A
LOGIC SYMBOL
1CEXT 2CEXT 1REXT/CEXT 2REXT/CEXT 14 6 15 7
S
1Q Q 1 9 1A 2A 1B 2B T Q 1Q 2Q 2Q
13 5
SV00096
2 10
4 12
PIN DESCRIPTION
PIN NUMBER 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 FUNCTION
3 1RD 2RD
RD
Trigger inputs (negative-edge triggered) Trigger inputs (positive-edge triggered) Direct reset LOW Outputs (active LOW) External resistor/capacitor connection
11
SV00160
FUNCTIONAL DIAGRAM
1CEXT 14 6 15 7
Ground (0V) Outputs (active HIGH) External capacitor connection External resistor/capacitor connection Positive supply voltage
S
2CEXT 1REXT/CEXT 2REXT/CEXT
1Q Q 2Q
13 5
LOGIC SYMBOL (IEEE/IEC)
14 15 1 2 4 3 CX RCX 13 &
1 9 2 10
1A 2A 1B 2B RD T Q 1Q 2Q 4 12
3 11
1RD 2RD
R
SV00162
6 7 9 10 12 11 CX RCX 5 &
R
SV00161
1997 Feb 04
3
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator with reset
74LV423
LOGIC DIAGRAM
nREXT/CEXT VCC
RD
Q
Q R R CL VCC CL
VCC R
CL
CL A
CL
B
It is recommended that Pin 6 (2CEXT) and Pin 14 (1CEXT) by externally grounded to Pin 8 (GND)
SV00163
FUNCTION TABLE
INPUTS nRD L X X H H nA X H X L nB X X L H
CEXT
OUTPUTS nQ L L* L* nQ H H* H*
REXT VCC
NOTES: * If the monostable was triggered before this condition was established, the pulse will continue as programmed. H = HIGH voltage level L = LOW voltage level X = don't care = LOW-to-HIGH transition = HIGH-to-LOW transition = one HIGH level output pulse = one LOW level output pulse
to nCEXT (pin 14 or 6)
to nREXT/CEXT (pin 15 or 7)
SV00101
Figure 1. Timing Component Connection
1997 Feb 04
4
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator with reset
ABSOLUTE MAXIMUM RATINGS1, 2
In accordance with the Absolute Maximum Rating System (IEC 134). Voltages are referenced to GND (ground = 0V). SYMBOL VCC "IIK "IOK "IO PARAMETER DC supply voltage DC input diode current DC output diode current DC output source or sink current - standard outputs - bus driver outputs DC VCC or GND current for types with - standard outputs - bus driver outputs Storage temperature range Power dissipation per package - plastic DIL - plastic mini-pack (SO) - plastic shrink mini-pack (SSOP and TSSOP) for temperature range: -40 to +125C above +70C derate linearly with 12 mW/K above +70C derate linearly with 8 mW/K above +60C derate linearly with 5.5 mW/K VI < -0.5 or VI > VCC + 0.5V VO < -0.5 or VO > VCC + 0.5V -0.5V < VO < VCC + 0.5V CONDITIONS
74LV423
RATING -0.5 to +7.0 20 50 25 35 50 70 -65 to +150 750 500 500
UNIT V mA mA mA
"IGND, "ICC Tstg
mA C
PTOT
mW
NOTES: 1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
RECOMMENDED OPERATING CONDITIONS
SYMBOL VCC VI VO Tamb PARAMETER DC supply voltage Input voltage Output voltage Operating ambient temperature range in free air Input rise and fall times except for Schmitt-trigger inputs See DC and AC characteristics per device VCC = 1.0V to 2.0V VCC = 2.0V to 2.7V VCC = 2.7V to 3.6V VCC = 3.6V to 5.5V CONDITIONS See Note 1 MIN 1.2 0 0 -40 -40 - - - - - - - TYP 3.3 - - MAX 5.5 VCC VCC +85 +125 500 200 100 50 UNIT V V V C
tr, tf
ns/V
NOTE: 1. The LV is guaranteed to function down to VCC = 1.0V (input levels GND or VCC); DC characteristics are guaranteed from VCC = 1.2V to VCC = 5.5V.
1997 Feb 04
5
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator with reset
74LV423
DC ELECTRICAL CHARACTERISTICS
Over recommended operating conditions. Voltages are referenced to GND (ground = 0V). LIMITS SYMBOL PARAMETER TEST CONDITIONS MIN VCC = 1.2V VIH HIGH level Input voltage VCC = 2.0V VCC = 2.7 to 3.6V VCC = 4.5 to 5.5V VCC = 1.2V VIL LOW level Input voltage VCC = 2.0V VCC = 2.7 to 3.6V VCC = 4.5 to 5.5 VCC = 1.2V; VI = VIH or VIL; -IO = 100A VCC = 2.0V; VI = VIH or VIL; -IO = 100A VOH HIGH l level output ltt voltage out uts voltage; all outputs VCC = 2.7V; VI = VIH or VIL; -IO = 100A VCC = 3.0V; VI = VIH or VIL; -IO = 100A VCC = 4.5V; VI = VIH or VIL; -IO = 100A VO OH HIGH level output g voltage; STANDARD outputs HIGH level output voltage; BUS driver outputs VCC = 3.0V; VI = VIH or VIL; -IO = 6mA VCC = 4.5V; VI = VIH or VIL; -IO = 12mA VCC = 3.0V; VI = VIH or VIL; -IO = 8mA VCC = 4.5V; VI = VIH or VIL; -IO = 16mA VCC = 1.2V; VI = VIH or VIL; IO = 100A VCC = 2.0V; VI = VIH or VIL; IO = 100A VOL LOW l ltt level output voltage out uts voltage; all outputs VCC = 2.7V; VI = VIH or VIL; IO = 100A VCC = 3.0V; VI = VIH or VIL; IO = 100A VCC = 4.5V; VI = VIH or VIL; IO = 100A VO OL LOW level output voltage; g STANDARD outputs LOW level output voltage; BUS driver outputs Input leakage current 3-State output OFF-state current Quiescent supply current; SSI Quiescent supply current; flip-flops Quiescent supply current; MSI Quiescent supply current; LSI Additional quiescent supply current VCC = 3.0V; VI = VIH or VIL; IO = 6mA VCC = 4.5V; VI = VIH or VIL; IO = 12mA VCC = 3.0V; VI = VIH or VIL; IO = 8mA VCC = 4.5V; VI = VIH or VIL; IO = 16mA VCC = 5.5V; VI = VCC or GND VCC = 5.5V; VI = VIH or VIL; VO = VCC or GND VCC = 5.5V; VI = VCC or GND; IO = 0 VCC = 5.5V; VI = VCC or GND; IO = 0 VCC = 5.5V; VI = VCC or GND; IO = 0 VCC = 5.5V; VI = VCC or GND; IO = 0 VCC = 2.7V to 3.6V; VI = VCC - 0.6V 1.8 2.5 2.8 4.3 2.40 3.60 2.40 3.60 1.2 2.0 2.7 3.0 4.5 2.82 4.20 2.82 4.20 0 0 0 0 0 0.25 0.35 0.20 0.35 0.2 0.2 0.2 0.2 0.40 0.55 0.40 0.55 1.0 5 20.0 20.0 20.0 500 500 0.2 0.2 0.2 0.2 0.50 V 0.65 0.50 V 0.65 1.0 10 40 A 80 160 A 1000 850 A A A V 1.8 2.5 2.8 4.3 2.20 V 3.50 2.20 V 3.50 V 0.9 1.4 2.0 0.7VO OH
VO OL II IOZ
ICC
ICC
ICC
NOTE: 1. All typical values are measured at Tamb = 25C.
1997 Feb 04
6
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator with reset
74LV423
AC CHARACTERISTICS
GND = 0V; tr = tf 2.5ns; CL = 50pF; RL = 1K SYMBOL PARAMETER WAVEFORM CONDITION VCC(V) 1.2 tPHL Propagation delay nRD, nA, nB, to nQ Figure 4 CEXT = 0pF REXT = 5k 2.0 2.7 3.0 to 3.6 4.5 to 5.5 1.2 tPLH Propagation delay nRD, nA, nB, to nQ Figure 4 CEXT = 0pF REXT = 5k 2.0 2.7 3.0 to 3.6 4.5 to 5.5 1.2 tPHL Propagation delay nRD to nQ (reset) Figure 4 CEXT = 0pF REXT = 5k 2.0 2.7 3.0 to 3.6 4.5 to 5.5 1.2 tPLH Propagation delay nRD to nQ (reset) Figure 4 CEXT = 0pF REXT = 5k 2.0 2.7 3.0 to 3.6 4.5 to 5.5 2.0 tW Trigger pulse width gg nA = LOW Figure 4 2.7 3.0 to 3.6 4.5 to 5.5 2.0 tW Trigger pulse width gg nB = HIGH Figure 4 2.7 3.0 to 3.6 4.5 to 5.5 2.0 tW Reset pulse width nRD = LOW Figure 3 2.7 3.0 to 3.6 4.5 to 5.5 2.0 tW Output pulse width nQ = HIGH nQ = LOW Q Figures 2 3 2, 2.7 3.0 to 3.6 4.5 to 5.5 2.0 tW Output pulse width nQ = HIGH nQ = LOW Q Figures 2 3 2, 2.7 3.0 to 3.6 4.5 to 5.5 2.0 trt t Retrigger time gg nA, nB Figure 2 2.7 3.0 to 3.6 4.5 to 5.5 NOTES ON FOLLOWING PAGE 302 ns 752 ns 4502 s 30 25 20 15 30 25 20 15 36 30 25 20 40 30 25 ns 62 MIN LIMITS -40 to +85 C TYP1 150 51 38 302 203 150 51 38 302 203 120 41 30 242 183 120 41 30 242 183 77 56 45 34 40 30 25 20 40 30 25 20 ns ns 92 68 54 41 ns 77 56 45 34 92 68 54 41 ns 95 70 56 38 116 85 68 45 ns 95 70 56 38 116 85 68 45 ns MAX -40 to +125 C MIN MAX UNIT
1997 Feb 04
7
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator with reset
74LV423
AC CHARACTERISTICS (Continued)
GND = 0V; tr = tf 2.5ns; CL = 50pF; RL = 1K SYMBOL PARAMETER CONDITION VCC(V) 1.2 2.0 REXT External timing resistor Figure 6 2.7 3.0 to 3.6 4.5 to 5.5 2.0 CEXT External timing g capacitor Figure 63 2.7 3.0 to 3.6 4.5 to 5.5 NOTES: 1. Unless otherwise stated, all typical values are at Tamb = 25C. 2. Typical value measured at VCC = 3.3V. 3. Typical value measured at VCC = 5.0V. 4. For other REXT and CEXT combinations see Figure 6. if CEXT > 10 nF, 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 = 5.0V and 0.48 for VCC = 2.0V. The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF. 5. The time to retrigger the monostable multivibrator depends on the values of REXT and CEXT. The output pulse width will only be extended when the time between the active-going edges of the trigger pulses meets the minimum retrigger time. If CEXT > 10 pF, the next formula (at VCC = 5.0V) for the set-up time of a retrigger pulse is valid: = 30 + 0.19R x C-9 + 13 x R1.05 (typ.) trt = retrigger time in ns; where, trt 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 approximately 7 pF. 6. When the device is powered up, initiate the device via a reset pulse, when CEXT < 50pF. No limits pF F MIN 20 5 5 2 2 LIMITS -40 to +85 C TYP1 MAX 1000 1000 1000 1000 1000 k -40 to +125 C MIN MAX UNIT
WAVEFORM
AC WAVEFORMS
VM = 1.5V at VCC w 2.7V; VM = 0.5 VCC at VCC t 2.7V. VOL and VOH are the typical output voltage drop that occur with the output load.
nB INPUT tW
nB INPUT
nA INPUT trt tW
nRD INPUT tW
nQ OUTPUT tW tW tW
nQ OUTPUT tW
SV00139
SV00164
Figure 2. Output pulse control using retrigger pulse; nRD = HIGH.
Figure 3. Output pulse control using reset input nRD; nA = LOW.
1997 Feb 04
8
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator with reset
74LV423
nB INPUT (nA LOW)
VM
tW
nA INPUT (nB HIGH)
tW
nRD INPUT
VM
tPLH
tPLH
tW
Q OUTPUT
VM
tTLH tW
tTHL
tPHL tW
tPLH
Q OUTPUT
VM
tTHL
tTLH
tPLH
tPHL
SV00197
Figure 4. Waveforms showing the input (nA, nB, nRD) to output (nQ, nQ) propagation delays, the output transition times, and the input and output pulse widths.
1997 Feb 04
9
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator with reset
74LV423
APPLICATION INFORMATION
0.8
Power-up considerations
`K' factor
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 Figure 7.
CX
RX VCC
0.4 nCEXT nREXT/CEXT
Q "423"
A B 0 0 1 2 3 4 VCC (V) 5 6
Q
SV00185
Figure 5. HCT typical "k" factor as a function of VCC; CX = 10 nF; RX = 10 kW to 100 kW.
RESET
VCC
SV00166
106
Figure 7. Power-up output pulse elimination circuit
REXT = 100kW 105 50kW
104 tW ns 103 2kW 10kW
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 power-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 (DX) preferably a germanium or Schottky type diode able to withstand large current surges and connect as shown in Figure 8.
102
DX
0 1 10 102 CEXT (pF) 103 104 CX VCC
SV00141
RX nREXT/CEXT
Figure 6. Typical output pulse width as a function of the external capacitor values at VCC = 3.3V and Tamb = 25C.
SV00154
Figure 8. Power-down protection circuit
1997 Feb 04
10
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator with reset
74LV423
TEST CIRCUIT
VCC S1
Open GND VI PULSE GENERATOR RT D.U.T. CL RL VO RL
2 < VCC
Test Circuit for switching times
SWITCH POSITION
TEST tPLH/tPHL tPLZ/tPZL tPHZ/tPZH S1 Open 2 < VCC
GND
DEFINITIONS
VCC < 2.7V 2.7-3.6V w 4.5V VI VCC 2.7V VCC RL = Load resistor; see AC CHARACTERISTICS for value. CL = Load capacitance includes jig and probe capacitance: See AC CHARACTERISTICS for value. RT = Termination resistance should be equal to ZOUT of pulse generators.
SV00755
Figure 9. Load circuitry for switching times
1997 Feb 04
11
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator with reset
74LV423
DIP16: plastic dual in-line package; 16 leads (300 mil); long body
SOT38-1
1997 Feb 04
12
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator with reset
74LV423
SO16: plastic small outline package; 16 leads; body width 3.9 mm
SOT109-1
1997 Feb 04
13
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator with reset
74LV423
SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm
SOT338-1
1997 Feb 04
14
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator with reset
74LV423
TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm
SOT403-1
1997 Feb 04
15
Philips Semiconductors
Preliminary specification
Dual retriggerable monostable multivibrator with reset
74LV423
DEFINITIONS
Data Sheet Identification
Objective Specification
Product Status
Formative or in Design
Definition
This data sheet contains the design target or goal specifications for product development. Specifications may change in any manner without notice. This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes at any time without notice, in order to improve design and supply the best possible product.
Preliminary Specification
Preproduction Product
Product Specification
Full Production
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. LIFE SUPPORT APPLICATIONS Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices, or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale. Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088-3409 Telephone 800-234-7381 (c) Copyright Philips Electronics North America Corporation 1997 All rights reserved. Printed in U.S.A.
Philips Semiconductors
1997 Feb 04 16

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