M74HC221 DUAL MONOSTABLE MULTIVIBRATOR ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED : tPD = 24 ns (TYP.) at VCC = 6V LOW POWER DISSIPATION: STAND BY STATE : ICC=4µA (MAX.) at TA=25°C ACTIVE STATE : ICC=700µA (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 = 150 ns ~ 60 s OVER AT V CC = 4.5 V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 221 DESCRIPTION The M74HC221 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). Triggering on the B input occurs at a particular voltage threshold and is not related to rise and fall time of the applied pulse. The device may also be trigger by using the CLR input (positive edge) because of the Schimtt-trigger input; after DIP SOP TSSOP ORDER CODES PACKAGE TUBE DIP SOP TSSOP M74HC221B1R M74HC221M1R T&R M74HC221RM13TR M74HC221TTR triggering the output maintains the MONOSTABLE STATE for the time period determined by the external resistor Rx and capacitor Cx. 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 5KΩ to 1MΩ Vcc > 3.0V 1KΩ to 1MΩ K ≅ 0.7 All inputs are equipped with protection circuits against static discharge and transient excess voltage. PIN CONNECTION AND IEC LOGIC SYMBOLS July 2001 1/14 M74HC221 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL 1,9 1A, 2A 2, 10 1B, 2B 3, 11 1 CLR 2 CLR 4, 12 1Q, 2Q 7 2RX/CX 13, 5 1Q, 2Q 1CX 2CX 14, 6 15 1RX/CX 8 16 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 OUTPUTS NOTE A X H B H H L X H H L Q Q L(*) L(*) H(*) H(*) OUTPUT ENABLE H L H X X X : Don’t Care (*) : Except for monostable period 2/14 CLR INHIBIT INHIBIT OUTPUT ENABLE OUTPUT ENABLE L L H INHIBIT M74HC221 SYSTEM DIAGRAM This logic diagram has not be used to estimate propagation delays TIMING CHART 3/14 M74HC221 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. 4/14 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) = 0.70 Cx · Rx 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. M74HC221 ABSOLUTE MAXIMUM RATINGS Symbol VCC Parameter Value Supply Voltage Unit -0.5 to +7 V -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 V DC Input Diode Current ± 20 mA IOK DC Output Diode Current ± 20 mA IO DC Output Current ± 25 mA ± 50 mA VI DC Input Voltage VO DC Output Voltage IIK ICC or IGND DC VCC or Ground Current PD Power Dissipation Tstg Storage Temperature TL Lead Temperature (10 sec) V 500(*) mW -65 to +150 °C 300 °C 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 65°C to 85°C RECOMMENDED OPERATING CONDITIONS Symbol VCC Parameter Supply Voltage Value Unit 2 to 6 V VI Input Voltage 0 to VCC V VO Output Voltage 0 to VCC V Top Operating Temperature Input Rise and Fall Time (CLR and A only) tr, tf Cx Rx External Capacitor External Resistor -55 to 125 °C VCC = 2.0V 0 to 1000 ns VCC = 4.5V 0 to 500 ns VCC = 6.0V 0 to 400 ns > 100 (*) 5K to 1M (*) 1K to 1M (*) pF Vcc < 3V Vcc > 3V Ω (*) 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 > 1MΩ 5/14 M74HC221 DC SPECIFICATIONS Test Condition Symbol VIH VIL VOH VOL II II ICC ICC’ Parameter High Level Input Voltage Low Level Input Voltage High Level Output Voltage (Q, Q Output) Low Level Output Voltage (Q, Q Output) Input Leakage Current R/C Terminal Off State Current Quiescent Supply Current Active State Supply Current (1) (1) : Per Circuit 6/14 Value TA = 25°C VCC (V) Min. 2.0 4.5 6.0 2.0 4.5 6.0 Typ. Max. 1.5 3.15 4.2 -40 to 85°C -55 to 125°C Min. Min. Max. 1.5 3.15 4.2 0.5 1.35 1.8 Max. 1.5 3.15 4.2 0.5 1.35 1.8 V 0.5 1.35 1.8 2.0 IO=-20 µA 1.9 2.0 1.9 1.9 4.5 IO=-20 µA 4.4 4.5 4.4 4.4 6.0 IO=-20 µA 5.9 6.0 5.9 5.9 4.5 IO=-4.0 mA 4.18 4.31 4.13 4.10 5.68 Unit V V 6.0 IO=-5.2 mA 2.0 IO=20 µA 0.0 0.1 0.1 0.1 4.5 IO=20 µA 0.0 0.1 0.1 0.1 6.0 IO=20 µA 0.0 0.1 0.1 0.1 4.5 IO=4.0 mA 0.17 0.26 0.33 0.40 6.0 IO=5.2 mA 0.18 0.26 0.33 0.40 6.0 VI = VCC or GND ± 0.1 ±1 ±1 µA 6.0 VI = VCC or GND ± 0.5 ±5 ± 10 µA 6.0 VI = VCC or GND 4 40 80 µA 2.0 4.5 6.0 VI = VCC or GND PIn 7 or 15 VIN = VCC/2 250 530 1 260 650 1.3 350 850 1.7 µA µA mA 5.8 45 400 0.7 5.63 5.60 V M74HC221 AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns) Test Condition Symbol Parameter 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 ∆tWOUT tW(H) tW(L) tW(L) Output Pulse Width Output Pulse Width Error Between Circuits in Same Package Minimum Pulse Width Minimum Pulse Width Value TA = 25°C VCC (V) Min. 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 Cx = 100 pF Rx = 10KΩ Cx = 0.1µF Rx = 100KΩ Typ. Max. 30 8 7 102 30 24 102 30 24 67 20 16 1.5 1.3 1.2 7.0 6.9 6.9 75 15 13 210 42 36 235 47 40 160 32 27 -40 to 85°C -55 to 125°C Min. Min. Max. 95 19 16 265 53 45 295 59 50 200 40 34 Unit Max. 110 22 19 315 63 54 355 71 60 240 48 41 ns ns ns ns µs ms ±1 % 2.0 4.5 6.0 2.0 4.5 6.0 75 15 13 75 15 13 95 19 16 95 19 16 110 22 20 110 22 20 ns ns CAPACITIVE CHARACTERISTICS Test Condition Symbol Parameter VCC (V) Value TA = 25°C Min. Typ. Max. 10 CIN Input Capacitance 5.0 5 CPD Power Dissipation Capacitance (note 1) 5.0 174 -40 to 85°C -55 to 125°C Min. Min. Max. 10 Unit Max. 10 pF pF 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 : %) 7/14 M74HC221 TEST CIRCUIT CL = 50pF or equivalent (includes jig and probe capacitance) RT = ZOUT of pulse generator (typically 50Ω) WAVEFORM 1: MINIMUM PULSE WIDTH (A, B), OUTPUT PULSE WIDTH, PROPAGATION DELAY TIME (f=1MHz; 50% duty cycle) 8/14 M74HC221 WAVEFORM 2 : MIIMUM PULSE WIDTH (CLR), PROPAGATION DELAY TIME(f=1MHz; 50% duty cycle) 9/14 M74HC221 WAVEFORM 3 : REMOVAL TIME (CLR TO A-B) (f=1MHz; 50% duty cycle) WAVEFORM 4 : REMOVAL TIME (CLR TO A-B) (f=1MHz; 50% duty cycle) 10/14 M74HC221 Plastic DIP-16 (0.25) MECHANICAL DATA mm. inch DIM. MIN. a1 0.51 B 0.77 TYP MAX. MIN. TYP. MAX. 0.020 1.65 0.030 0.065 b 0.5 0.020 b1 0.25 0.010 D 20 0.787 E 8.5 0.335 e 2.54 0.100 e3 17.78 0.700 F 7.1 0.280 I 5.1 0.201 L Z 3.3 0.130 1.27 0.050 P001C 11/14 M74HC221 SO-16 MECHANICAL DATA DIM. mm. MIN. TYP A a1 inch MAX. MIN. TYP. 1.75 0.1 0.068 0.2 a2 MAX. 0.003 0.007 1.65 0.064 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.019 c1 45° (typ.) D 9.8 10 0.385 0.393 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 8.89 0.350 F 3.8 4.0 0.149 0.157 G 4.6 5.3 0.181 0.208 L 0.5 1.27 0.019 0.050 M S 0.62 0.024 8° (max.) PO13H 12/14 M74HC221 TSSOP16 MECHANICAL DATA mm. inch DIM. MIN. TYP A MAX. MIN. TYP. MAX. 1.2 A1 0.05 A2 0.8 b 0.047 0.15 0.002 0.004 0.006 1.05 0.031 0.039 0.041 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0089 D 4.9 5 5.1 0.193 0.197 0.201 E 6.2 6.4 6.6 0.244 0.252 0.260 E1 4.3 4.4 4.48 0.169 0.173 0.176 1 e 0.65 BSC K 0° L 0.45 A 0.60 0.0256 BSC 8° 0° 0.75 0.018 8° 0.024 0.030 A2 A1 b e K c L E D E1 PIN 1 IDENTIFICATION 1 0080338D 13/14 M74HC221 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. © The ST logo is a registered trademark of STMicroelectronics © 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 © http://www.st.com 14/14