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M74HC4538
Dual retriggerable monostable multivibrator
Features

High speed: tPD = 25 ns (typ.) at VCC = 6 V Low power dissipation standby state: ICC = 4 A (max.) at TA = 25 C active state: ICC = 200 A (max.) at VCC = 6 V High noise immunity: VNIH = VNIL = 28 % VCC (min.) Symmetrical output impedance: |IOH| = IOL = 4 mA (min.) Balanced propagation delays: tPLH tPHL Wide operating voltage range: VCC (opr) = 2 to 6 V Wide output pulse width range: tWOUT = 120 ns ~ 60 s over at VCC = 4.5 V Pin and function compatible with 74 series 4538
TSSOP16 SO-16 DIP-16

Description
The M74HC4538 is a high speed CMOS monostable multivibrator fabricated with silicon gate C2MOS technology. Each multivibrator features both a negative A, and a positive B, edge triggered input, either of which can be used as an inhibit input. Also included is a clear input that when taken low resets the one shot. The monostable multivibrators are retriggerable. That is, they may be triggered repeatedly while their outputs are generating a pulse and the pulse will be extended. Pulse width stability over a wide range of temperature and supply is achieved using linear CMOS techniques. The output pulse equation is simply: PW = 0.7 (R)(C) where PW is in seconds, R in Omhs and C is in Farads. All the inputs are equipped with protection circuits against static discharge and transient excess voltage.
Table 1.
Device summary
Order code M74HC4538B1R Package DIP-16 SO-16 TSSOP16 Packaging Tube Tape and reel Tape and reel
M74HC4538RM13TR M74HC4538TTR
May 2008
Rev 2
1/18
www.st.com 18
Pin connection and IEC logic symbols
M74HC4538
1
Pin connection and IEC logic symbols
Figure 1. Pin connections and IEC logic symbols
1T1 1T2 1CD
1
16 15 14 13 12 11 10 9
VCC
2T1 2T2 2CD 2A 2B Q2 Q2
2 3 4 5 6 7 8
Inputs
1A 1B Q1
Inputs
Outputs
Outputs
Q1 GND
Table 2.
Pin description
Symbol 1T1, 2T1 1T2, 2T2 1CD, 2CD 1A, 2A 1B, 2B Q1, Q2 Q1, Q2 GND VCC Name and function External capacitor connections External resistor, capacitor connections Direct reset inputs (active low) Trigger inputs (low to high, edge-triggered) Trigger inputs (high to low, edge-triggered) Pulse outputs Complementary pulse outputs Ground (0 V) Positive supply voltage
Pin number 1, 15 2, 14 3, 13 4, 12 5, 11 6, 10 7, 9 8 16
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M74HC4538 Figure 2. Input and output equivalent circuit
Pin connection and IEC logic symbols
VCC
VCC
Input
Output
GND
GND
Table 3.
Truth table
Inputs Outputs Note CD H H H H X L L H L L H H Q Q Output enable Inhibit Inhibit Output enable Inhibit
A
B H
X H L X
L X
Figure 3.
System diagram
3/18
Pin connection and IEC logic symbols Figure 4. Timing chart
M74HC4538
Figure 5.
Block diagram
1. Cx, Rx, Dx are external components. 2. Dx is a clamping diode. The external capacitor is charged to VCC in the standby state, i.e. no trigger. When the supply voltage is turned off Cx is discharged mainly through an internal parasitic diode (see figures). If Cx is sufficiently large and VCC decreases rapidly, there will be some possibility of damaging the IC with a surge current or latchup. If the voltage supply filter capacitor is large enough and VCC decreases slowly, the surge current is automatically limited and damage to the IC is avoided. The maximum forward current of the parasitic diode is approximately 20 mA. In cases where Cx is large the time taken for the supply voltage to fall to 0.4 VCC can be calculated as follows: tf > (VCC - 0.7) x Cx/20 mA. In cases where tf is too short an external clamping diode is required to protect the IC from the surge current.
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M74HC4538
Functional description
2
Functional description
Standby state
The external capacitor Cx, is fully charged to VCC in the standby state. Hence, before triggering, transistor Qp and Qn (connected to the Rx/Cx node) are both turned-off. The two comparators that control the timing and the two reference voltage sources stop operating. The total supply current is therefore only leakage current.
Trigger operation
Triggering occurs when: - - A is low and B has a falling edge B is high and A has a rising edge
After the multivibrator has been retriggered, the comparator C1 and C2 start operating and Qn is turned on. Cx then discharges through Qn. The voltage at the node Rx/Cx external falls. When it reaches VREFL the output of comparator C1 becomes low. This in turn resets the flip-flop and Qn is turned off. At this point C1 stops functioning but C2 continues to operate. The voltage at R/C external begins to rise with a time constant set by the external components Rx and Cx. Triggering the multivibrator causes Q to go high after internal delay due to the flip-flop and the gate. Q remains high until the voltage at R/C external rises again to VREFH . At this point C2 output goes low and G goes low. C2 stops operating. That means that after triggering when the voltage R/C external returns to VREFH the multivibrator has returned to its monostable state. In the case where Rx * Cx are large enough and the discharge time of the capacitor and the delay time in the IC can be ignored, the width of the output pulse tw(out) is as follows:
t W( OUT ) = 0.72Cx * Rx
Re-triggered operation
When a second triggered pulse follows the first, its effect will depend on the state of the multivibrator. If the capacitor Cx is being charged, the voltage level of Rx/Cx external falls to VREFL again and Q remains high i.e. the retrigger pulse arrives in a time shorter than the period Rx * Cx seconds, the capacitor charging time constant. If the second trigger pulse is very close to the initial trigger pulse it is ineffective; i.e. the second trigger must arrive in the capacitor discharge cycle to be ineffective; hence the minimum time for a second trigger to be effective, trr (min.) depends on VCC and Cx.
Reset operation
CD is normally high. If CD is low, the trigger is not effective because Q output goes low and trigger control flip-flop is reset. Also transistor Op is turned on and Cx is charged quickly to VCC. Then, if CD input goes low the IC becomes waiting state both in operating and non operating state.
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Maximum rating
M74HC4538
3
Maximum rating
Stressing the device above the rating listed in the "Absolute maximum ratings" table may cause permanent damage to the device. These are stress ratings only, and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents.
Table 4.
Symbol VCC VI VO IIK IOK IO ICC or IGND PD Tstg TL Supply voltage DC input voltage DC output voltage DC input diode current DC output diode current DC output current DC VCC or ground current Power dissipation Storage temperature Lead temperature (10 sec)
Absolute maximum ratings
Parameter Value -0.5 to +7 -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 20 20 25 50 500(1) -65 to +150 300 Unit V V V mA mA mA mA mW C C
1. 500 mW at 65 C; derate to 300 mW by 10 mW/ C from 65 C to 85 C
3.1
Recommended operating conditions
Table 5.
Symbol VCC VI VO Top Supply voltage Input voltage Output voltage Operating temperature VCC = 2.0 V tr, tf Input rise and fall time (CD only) VCC = 4.5 V VCC = 6.0 V Cx Rx External capacitor External resistor VCC 3.0 V VCC 3.0 V
Recommended operating conditions
Parameter Value 2 to 6 0 to VCC 0 to VCC -55 to 125 0 to 1000 0 to 500 0 to 400 No limitation 5 K to 1 M 1 K to 1 M Unit V V V C ns ns ns pF
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M74HC4538
Electrical characteristics
4
Table 6.
Electrical characteristics
DC specifications
Test condition Value TA = 25C Min 2.0 VIH High level input voltage 4.5 6.0 2.0 VIL Low level input voltage 4.5 6.0 2.0 4.5 VOH High level output voltage 6.0 4.5 6.0 2.0 4.5 VOL Low level output voltage 6.0 4.5 6.0 II II ICC Input leakage current Input leakage current Quiescent supply current Quiescent supply current 6.0 6.0 6.0 2.0 ICC 4.5 6.0 IO = -20 A IO = -20 A IO = -20 A IO = -4.0 mA IO = -5.2 mA IO = 20 A IO = 20 A IO = 20 A IO = 4.0 mA IO = 5.2 mA VI = VCC or GND VI = VCC or GND Rext/Cext VI = VCC or GND VI = VCC or GND Pin 2 or 14 VIN = VCC/2 40 0.2 0.3 1.9 4.4 5.9 4.18 5.68 2.0 4.5 6.0 4.31 5.8 0.0 0.0 0.0 0.17 0.18 0.1 0.1 0.1 0.26 0.26 0.1 0.1 4 120 0.3 0.6 1.5 3.15 4.2 0.5 1.35 1.8 1.9 4.4 5.9 4.13 5.63 0.1 0.1 0.1 0.33 0.33 1 1 40 160 0.4 0.8 Typ Max -40 to 85C Min 1.5 3.15 4.2 0.5 1.35 1.8 1.9 4.4 5.9 4.10 5.60 0.1 0.1 0.1 0.40 0.40 1 1 80 200 0.6 1.0 A A A A mA mA V V Max -55 to 125C Min 1.5 3.15 4.2 0.5 1.35 1.8 V V Max Unit
Symbol
Parameter
VCC (V)
7/18
Electrical characteristics
M74HC4538
Table 7.
AC electrical characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Test condition Value TA = 25C Min 2.0 Output transition time Typ 30 8 7 120 30 25 100 25 20 Rx = 5 K Cx=0 Rx = 1 K Rx = 1 K 70 Cx = 0.01 F Rx = 10 K 69 69 0.67 Cx = 0.1 F Rx = 10 K 0.67 0.67 540 180 150 83 77 77 0.75 0.73 0.73 Max 75 15 13 250 50 43 195 39 33 1200 250 200 96 85 85 0.83 0.77 0.77 70 69 69 0.67 0.67 0.67 -40 to 85C Min Max 95 19 16 315 63 54 245 49 42 1500 320 260 96 85 85 0.83 0.77 0.77 70 69 69 0.67 0.67 0.67 -55 to 125C Min Max 110 22 19 375 75 64 295 59 50 1800 375 320 96 85 85 0.9 0.8 0.8 ms s ns ns ns ns Unit
Symbol
Parameter
VCC (V)
tTLH tTHL
4.5 6.0
tPLH tPHL
Propagation delay time (A, B - Q, Q) Propagation delay time (CD - Q, Q)
2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0
tPLH tPHL
tWOUT
Output pulse width
4.5 6.0 2.0 4.5 6.0
tWOUT
Output pulse width error between circuits in same package 2.0 4.5 6.0 2.0 4.5 6.0 2.0
1
%
Minimum pulse tW(H) tW(L) width (A,B) Minimum pulse width (CD)
30 8 7 30 8 7 0 0 0
75 15 13 75 15 13 15 5 5
95 19 16 95 19 16 15 5 5
110 22 19 110 22 19 20 7 ns ns ns
tW(L)
tREM
Minimum clear removal time
4.5 6.0
8/18
M74HC4538 Table 7.
Electrical characteristics AC electrical characteristics (CL = 50 pF, Input tr = tf = 6 ns) (continued)
Test condition Value TA = 25C Min 2.0 4.5 Cx = 0.1 F Rx = 1K Typ 380 92 72 6 Cx = 0.01F Rx = 1K 1.4 1.2 s ns Max -40 to 85C Min Max -55 to 125C Min Max Unit
Symbol
Parameter
VCC (V)
trr
Minimum retrigger time
6.0 2.0 4.5 6.0
Table 8.
Capacitive characteristics
Test condition Value TA = 25C Min Typ 5 70 Max 10 -40 to 85C Min Max 10 -55 to 125C Min Max 10 pF pF Unit
Symbol
Parameter
VCC (V) 5.0 5.0
CIN CPD
Input capacitance Power dissipation capacitance (1)
1. CPD is defined as the value of the IC's internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC' Duty/100 + Ic/2(per monostable) (Icc' : Active Supply current) (Duty : %)
9/18
Electrical characteristics Figure 6. Test circuit
M74HC4538
Figure 7.
Waveform: propagation delay times (f = 1 MHz; 50% duty cycle)
10/18
M74HC4538
Package mechanical data
5
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
11/18
Package mechanical data
M74HC4538
Plastic DIP-16 (0.25) MECHANICAL DATA
mm. DIM. MIN. a1 B b b1 D E e e3 F I L Z 3.3 1.27 8.5 2.54 17.78 7.1 5.1 0.130 0.050 0.51 0.77 0.5 0.25 20 0.335 0.100 0.700 0.280 0.201 1.65 TYP MAX. MIN. 0.020 0.030 0.020 0.010 0.787 0.065 TYP. MAX. inch
P001C
12/18
M74HC4538
Package mechanical data
SO-16 MECHANICAL DATA
DIM. A a1 a2 b b1 C c1 D E e e3 F G L M S 3.8 4.6 0.5 9.8 5.8 1.27 8.89 4.0 5.3 1.27 0.62 8 (max.) 0.149 0.181 0.019 10 6.2 0.35 0.19 0.5 45 (typ.) 0.385 0.228 0.050 0.350 0.157 0.208 0.050 0.024 0.393 0.244 0.1 mm. MIN. TYP MAX. 1.75 0.25 1.64 0.46 0.25 0.013 0.007 0.019 0.004 MIN. inch TYP. MAX. 0.068 0.010 0.063 0.018 0.010
0016020D
13/18
Package mechanical data
M74HC4538
TSSOP16 MECHANICAL DATA
mm. DIM. MIN. A A1 A2 b c D E E1 e K L 0 0.45 0.60 0.05 0.8 0.19 0.09 4.9 6.2 4.3 5 6.4 4.4 0.65 BSC 8 0.75 0 0.018 0.024 1 TYP MAX. 1.2 0.15 1.05 0.30 0.20 5.1 6.6 4.48 0.002 0.031 0.007 0.004 0.193 0.244 0.169 0.197 0.252 0.173 0.0256 BSC 8 0.030 0.004 0.039 MIN. TYP. MAX. 0.047 0.006 0.041 0.012 0.0079 0.201 0.260 0.176 inch
A
A2 A1 b e K c L E
D
E1
PIN 1 IDENTIFICATION
1
0080338D
14/18
M74HC4538
Package mechanical data
Tape & Reel SO-16 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 6.45 10.3 2.1 3.9 7.9 12.8 20.2 60 22.4 6.65 10.5 2.3 4.1 8.1 0.254 0.406 0.082 0.153 0.311 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.262 0.414 0.090 0.161 0.319 MIN. TYP. MAX. 12.992 0.519 inch
15/18
Package mechanical data
M74HC4538
Tape & Reel TSSOP16 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 6.7 5.3 1.6 3.9 7.9 12.8 20.2 60 22.4 6.9 5.5 1.8 4.1 8.1 0.264 0.209 0.063 0.153 0.311 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.272 0.217 0.071 0.161 0.319 MIN. TYP. MAX. 12.992 0.519 inch
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M74HC4538
Revision history
6
Revision history
Table 9.
Date 01-Jul-2001
Document revision history
Revision 1 Initial release. Document converted and restructured to new template. Removed: M74HC4538M1R order code. Minor text changes. Added: SO-16 and TSSOP16 tape and reel specifications. Changes
26-May-2008
2
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M74HC4538
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