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M74HC123
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
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HIGH SPEED : tPD = 23 ns (TYP.) at VCC = 6V LOW POWER DISSIPATION: STAND BY STATE : ICC=4A (MAX.) at TA=25C ACTIVE STATE : ICC=200A (MAX.) at VCC = 5V HIGH NOISE IMMUNITY: VNIH = V NIL = 28 % VCC (MIN.) SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 4mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL WIDE OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V WIDE OUTPUT PULSE WIDTH RANGE : tWOUT = 120 ns ~ 60 s OVER AT V CC = 4.5 V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 123
DIP
SOP
TSSOP
ORDER CODES
PACKAGE DIP SOP TSSOP TUBE M74HC123B1R M74HC123M1R T&R M74HC123RM13TR M74HC123TTR
DESCRIPTION The M74HC123 is an high speed CMOS MONOSTABLE MULTIVIBRATOR fabricated with silicon gate C2MOS technology. There are two trigger inputs, A INPUT (negative edge) and B INPUT (positive edge). These inputs are valid for slow rising/falling signals, (tr=tf=l sec). The device may also be triggered by using the CLR input (positive-edge) because of the Schmitt-trigger input; after triggering the output maintains the MONOSTABLE state for the time PIN CONNECTION AND IEC LOGIC SYMBOLS
period determined by the external resistor Rx and capacitor Cx. When Cx > 10nF and Rx > 10K, the output pulse width value is approsimatively given by the formula : tW(OUT) = K * Cx * Rx. (K 0.45). Taking CLR low breaks this MONOSTABLE STATE. If the next trigger pulse occurs during the MONOSTABLE period it makes the MONOSTABLE period longer. Limit for values of Cx and Rx : Cx : NO LIMIT Rx : Vcc < 3.0V 5K to 1M Vcc > 3.0V 1K to 1M All inputs are equipped with protection circuits against static discharge and transient excess voltage.
July 2001
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M74HC123
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No 1,9 2, 10 3, 11 4, 12 7 13, 5 14, 6 15 8 16 SYMBOL 1A, 2A 1B, 2B 1 CLR 2 CLR 1Q, 2Q 2RX/CX 1Q, 2Q 1CX 2CX 1RX/CX GND Vcc NAME AND FUNCTION Trigger Inputs (Negative Edge Triggered) Trigger Inputs (Positive Edge Triggered) Direct Reset LOW and trigger Action at Positive Edge Outputs (Active Low) External Resistor Capacitor Connection Outputs (Active High) External Capacitor Connection External Resistor Capacitor Connection Ground (0V) Positive Supply Voltage
TRUTH TABLE
INPUTS A B H X H L L X
X : Don't Care
OUTPUTS NOTE CLR H H H H L L H H Q Q OUTPUT ENABLE INHIBIT INHIBIT OUTPUT ENABLE OUTPUT ENABLE L L H INHIBIT
L X
H X
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M74HC123
SYSTEM DIAGRAM
This logic diagram has not be used to estimate propagation delays
TIMING CHART
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M74HC123
BLOCK DIAGRAM
(1) Cx, Rx, Dx are external components. (2) Dx is a clamping diode. The external capacitor is charged to Vcc in the stand-by-state, i.e. no trigger. When the supply voltage is turned off Cx is di scharged mainly trough an internal parasitic diode(see figures). If Cx is sufficiently large and Vcc decreases rapidly, there will be some possibility of damaging the I.C. with a surge current or latch-up. If the voltage supply filter capacitor is large enough and Vcc decrease slowly, the surge current is automatically limited and damage to the I.C. 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/20mA In cases where tf is too short an external clamping diode is required to protect the I.C. from the surge current.
FUNCTIONAL DESCRIPTION STAND-BY STATE The external capacitor,Cx, is fully charged to Vcc in the stand-by 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 : 1 st) A is "LOW" and B has a falling edge; 2 nd) B is "HIGH" and A has a rising edge; 3 rd) A is "LOW" and B is HIGH and C1 has a rising edge; After the multivibrator has been retriggered comparator C1 and C2 start operating and Qn is turned on. Cx then discharges through Qn. The voltage at the node R/C external falls. When it reaches VREFL the output of comparator C1 becomes low. This in turn reset 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, 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 O goes low. C2 stop 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 I.C. can be ignored, the width of the output pulse tw (out) is as follows : tW(OUT) = 0.45 Cx * Rx RE - TRIGGERED OPERATION When a second trigger 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 R/C 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 depends on Vcc and Cx RESET OPERATION CL is normally high. If CL 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. This means if CL input goes low the IC becomes waiting state both in operating and non operating state.
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M74HC123
ABSOLUTE MAXIMUM RATINGS
Symbol VCC VI VO IIK IOK IO PD Tstg TL Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Current Power Dissipation Storage Temperature Lead Temperature (10 sec) Parameter Value -0.5 to +7 -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 20 20 25 50 500(*) -65 to +150 300 Unit V V V mA mA mA mA mW C C
ICC or IGND DC VCC or Ground Current
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied (*) 500mW at 65 C; derate to 300mW by 10mW/C from 65C to 85C
RECOMMENDED OPERATING CONDITIONS
Symbol VCC VI VO Top tr, tf Cx Rx External Capacitor External Resistor Supply Voltage Input Voltage Output Voltage Operating Temperature Input Rise and Fall Time VCC = 2.0V VCC = 4.5V VCC = 6.0V Vcc < 3V Vcc > 3V 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 5K to 1M 1K to 1M Unit V V V C ns ns ns pF
The Maximum allowable values of Cx and Rx are a function of leakage of capacitor Cx, the leakage of device and leakage due to the board layout and surface resistance. Susceptibility to externally induced noise may occur for Rx > 1M
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M74HC123
DC SPECIFICATIONS
Test Condition Symbol Parameter VCC (V) 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 4.5 6.0 VOL Low Level Output Voltage 2.0 4.5 6.0 4.5 6.0 II ICC ICC' Input Leakage Current Quiescent Supply Current Active State Supply Current (1) 6.0 6.0 2.0 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 VI = VCC or GND Pin 7 or 15 VIN = VCC/2 45 500 0.7 TA = 25C Min. 1.5 3.15 4.2 0.5 1.35 1.8 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 4 200 600 1 1.9 4.4 5.9 4.13 5.63 0.1 0.1 0.1 0.33 0.33 1 40 260 780 1.3 Typ. Max. Value -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 80 320 960 1.6 A A A A mA V V Max. -55 to 125C Min. 1.5 3.15 4.2 0.5 1.35 1.8 Max. V Unit
VIH
High Level Input Voltage Low Level Input Voltage High Level Output Voltage
VIL
V
VOH
(1) : Per Circuit
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M74HC123
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)
Test Condition Symbol Parameter VCC (V) 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 TA = 25C Min. Typ. 30 8 7 102 29 22 102 31 23 68 20 16 1.4 1.2 1.1 4.6 4.4 4.3 1 Max. 75 15 13 210 42 36 235 47 40 160 32 27 Value -40 to 85C Min. Max. 95 19 16 265 53 45 295 59 50 200 40 34 -55 to 125C Min. Max. 110 22 19 315 63 54 355 71 60 240 48 41 ns Unit
tTLH tTHL Output Transition Time tPLH tPHL Propagation Delay Time (A, B - Q, Q) tPLH tPHL Propagation Delay Time(CLR TRIGGER - Q, Q) tPLH tPHL Propagation Delay Time (CLR - Q, Q) tWOUT Output Pulse Width
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ns
ns
Cx = 100 pF Rx = 10K Cx = 0.1F Rx = 100K
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ms
tWOUT
tW(H) tW(L) tW(L)
Output Pulse Width Error Between Circuits in Same Package Minimum Pulse Width Minimum Pulse Width (CLR) Minimum Retrigger Time
% 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 75 15 13 75 15 13 Cx = 100 pF Rx = 10K Cx = 0.1F Rx = 100K 325 108 78 5 1.4 1.2 95 19 16 95 19 16 110 22 19 110 22 19
ns
ns
trr
ns
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CAPACITIVE CHARACTERISTICS
Test Condition Symbol Parameter VCC (V) 5.0 5.0 TA = 25C Min. Typ. 5 162 Max. 10 Value -40 to 85C Min. Max. 10 -55 to 125C Min. Max. 10 pF pF Unit
CIN CPD
Input Capacitance Power Dissipation Capacitance (note 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 : %)
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M74HC123
TEST CIRCUIT
CL = 50pF or equivalent (includes jig and probe capacitance) RT = ZOUT of pulse generator (typically 50)
WAVEFORM : SWITCIHNG CHARACTERISTICS TEST WAVEFORM (f=1MHz; 50% duty cycle)
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M74HC123
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
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M74HC123
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 0.2 1.65 0.46 0.25 0.013 0.007 0.019 0.003 MIN. inch TYP. MAX. 0.068 0.007 0.064 0.018 0.010
PO13H
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M74HC123
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 0.0089 0.201 0.260 0.176 inch
A
A2 A1 b e K c L E
D
E1
PIN 1 IDENTIFICATION
1
0080338D
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M74HC123
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. (c) The ST logo is a registered trademark of STMicroelectronics (c) 2001 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom (c) http://www.st.com
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