MM74HC221AM

Revised January 2004 MM74HC221A Dual Non-Retriggerable Monostable Multivibrator General Description Features The MM74HC221A high speed monostable multivibrators (one shots) utilize advanced silicon-gate CMOS technology. They feature speeds comparable to low power Schottky TTL circuitry while retaining the low power and high noise immunity characteristic of CMOS circuits. ■ Typical propagation delay: 40 ns Each multivibrator features both a negative, A, and a positive, B, transition 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 MM74HC221A can be triggered on the positive transition of the clear while A is held LOW and B is held HIGH. ■ Fanout of 10 LS-TTL loads The MM74HC221A is a non-retriggerable, and therefore cannot be retriggered until the output pulse times out. ■ Wide power supply range: 2V–6V ■ Low quiescent current: 80 µA maximum (74HC Series) ■ Low input current: 1 µA maximum ■ Simple pulse width formula T = RC ■ Wide pulse range: 400 ns to ∞ (typ) ■ Part to part variation: ±5% (typ) ■ Schmitt Trigger A & B inputs enable infinite signal input rise or fall times Pulse width stability over a wide range of temperature and supply is achieved using linear CMOS techniques. The output pulse equation is simply: PW = (REXT) (CEXT); where PW is in seconds, R is in ohms, and C is in farads. All inputs are protected from damage due to static discharge by diodes to VCC and ground. Ordering Code: Order Number Package Number Package Description MM74HC221AM (Note 1) M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow MM74HC221ASJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide MM74HC221AN N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Note 1: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagrams Timing Component Top View Note: Pin 6 and Pin 14 must be hard-wired to GND. © 2004 Fairchild Semiconductor Corporation DS005325 www.fairchildsemi.com MM74HC221A Dual Non-Retriggerable Monostable Multivibrator September 1983 MM74HC221A Truth Table Inputs Outputs Clear A B Q Q L X X L H X H X L H X X L    H L ↑ H ↓ H ↑ L H H = HIGH Level L = LOW Level ↑ = Transition from LOW-to-HIGH ↓ = Transition from HIGH-to-LOW = One HIGH Level Pulse = One LOW Level Pulse X = Irrelevant  Logic Diagram www.fairchildsemi.com 2 L H Recommended Operating Conditions (Note 3) −0.5V to +7.0V Supply Voltage (VCC) DC Input Voltage (VIN) −1.5V to VCC+1.5V DC Output Voltage (VOUT) −0.5V to VCC+0.5V Clamp Diode Current (IIK, IOK) ±20 mA DC Output Current, per pin (IOUT) ±25 mA (VIN, VOUT) Operating Temperature Range (TA) S.O. Package only 500 mW Lead Temperature (TL) V 0 VCC V −40 +85 °C VCC = 2.0V 1000 ns VCC = 4.5V 500 ns VCC = 6.0V 400 ns Note 2: Maximum Ratings are those values beyond which damage to the device may occur. 260°C (Soldering 10 seconds) Units 6 Time (Clear Input) Power Dissipation (PD) 600 mW Max 2 Maximum Input Rise and Fall −65°C to +150°C (Note 4) Min DC Input or Output Voltage ±50 mA DC VCC or GND Current, per pin (ICC) Storage Temperature Range (TSTG) Supply Voltage (VCC) Note 3: Unless otherwise specified all voltages are referenced to ground. Note 4: Power Dissipation temperature derating — plastic “N” package: − 12 mW/°C from 65°C to 85°C. DC Electrical Characteristics Symbol VIH VIL VOH Parameter Conditions (Note 5) VCC TA = 25°C Typ TA = −40 to 85°C TA = −55 to 125°C Guaranteed Limits Minimum HIGH Level 2.0V 1.5 1.5 1.5 Input Voltage 4.5V 3.15 3.15 3.15 6.0V 4.2 4.2 4.2 Maximum LOW Level 2.0V 0.3 0.3 0.3 Input Voltage 4.5V 0.9 0.9 0.9 6.0V 1.2 1.2 1.2 Minimum HIGH Level VIN = VIH or VIL Output Voltage |IOUT| ≤ 20 µA 2.0V 2.0 1.9 1.9 1.9 4.5V 4.5 4.4 4.4 4.4 6.0V 6.0 5.9 5.9 5.9 |IOUT| ≤ 4.0 mA 4.5V 4.2 3.98 3.84 3.7 |IOUT| ≤ 5.2 mA 6.0V 5.7 5.48 5.34 5.2 Units V V V VIN = VIH or VIL VOL Maximum LOW Level VIN = VIH or VIL Output Voltage |IOUT| ≤ 20 µA 2.0V 0 0.1 0.1 0.1 4.5V 0 0.1 0.1 0.1 6.0V 0 0.1 0.1 0.1 |IOUT| ≤ 4.0 mA 4.5V 0.2 0.26 0.33 0.4 |IOUT| ≤ 5.2 mA 6.0V 0.2 0.26 0.33 0.4 VIN = VCC or GND 6.0V ±0.5 ±5.0 ±5.0 µA VIN = VCC or GND 6.0V ±0.1 ±1.0 ±1.0 µA Maximum Quiescent Supply VIN = VCC or GND 6.0V 8.0 80 160 µA V VIN = VIH or VIL IIN Maximum Input Current (Pins 7, 15) IIN Maximum Input Current (all other pins) ICC Current (standby) ICC IOUT = 0 µA Maximum Active Supply VIN = VCC or GND 2.0V 36 80 110 130 µA Current (per monostable) R/CEXT = 0.5VCC 4.5V 0.33 1.0 1.3 1.6 mA 6.0V 0.7 2.0 2.6 3.2 mA Note 5: For a power supply of 5V ±10% the worst-case output voltages (VOH, and VOL) occur for HC at 4.5V. Thus the 4.5V values should be used when designing with this supply. Worst-case VIH and VIL occur at VCC = 5.5V and 4.5V respectively. (The VIH value at 5.5V is 3.85V.) The worst-case leakage current (IIN, ICC, and IOZ) occur for CMOS at the higher voltage and so the 6.0V values should be used. 3 www.fairchildsemi.com MM74HC221A Absolute Maximum Ratings(Note 2) MM74HC221A AC Electrical Characteristics VCC = 5V, TA = 25°C, CL = 15 pF, tr = tf = 6 ns Symbol tPLH Parameter Conditions Guaranteed Typ Maximum Trigger Propagation Units Limit 22 36 ns 25 42 ns ns Delay A, B or Clear to Q tPHL Maximum Trigger Propagation Delay A, B or Clear to Q tPHL Maximum Propagation Delay Clear to Q 20 31 tPLH Maximum Propagation Delay Clear to Q 22 33 ns tW Minimum Pulse Width A, B or Clear 14 26 ns tREM Minimum Clear Removal Time tWQ(MIN) Minimum Output Pulse Width CEXT = 28 pF tWQ Output Pulse Width CEXT = 1000 pF 0 ns 400 ns 10 µs REXT = 2 kΩ REXT = 10 kΩ AC Electrical Characteristics CL = 50 pF, tr = tf = 6 ns (unless otherwise specified) Symbol tPLH tPHL tPHL tPLH tW tREM Parameter VCC Conditions Units Guaranteed Limits 2.0V 77 169 194 Delay A, B or Clear to Q 4.5V 26 42 51 57 6.0V 21 32 39 44 Maximum Trigger Propagation 2.0V 88 197 229 250 Delay A, B or Clear to Q 4.5V 29 48 60 67 6.0V 24 38 46 51 Maximum Propagation 2.0V 54 114 132 143 Delay Clear to Q 4.5V 23 34 41 45 6.0V 19 28 33 36 Maximum Propagation 2.0V 56 116 135 147 Delay Clear to Q 4.5V 25 36 42 46 6.0V 20 29 34 37 210 Minimum Pulse Width 2.0V 57 123 144 157 A, B, Clear 4.5V 17 30 37 42 6.0V 12 21 27 30 Minimum Clear 2.0V 0 0 0 Removal Time 4.5V 0 0 0 6.0V 0 0 0 Rise and Fall Time tWQ TA = −40 to 85°C TA = −55 to 125°C Maximum Trigger Propagation tTLH, tTHL Maximum Output tWQ(MIN) TA = 25°C Typ 2.0V 30 75 95 110 4.5V 8 15 19 22 6.0V 7 13 16 19 ns ns ns ns ns ns ns Minimum Output CEXT = 28 pF 2.0V 1.5 Pulse Width REXT = 2 kΩ 4.5V 450 ns REXT = 6 kΩ (VCC = 2V) 6.0V 380 ns CEXT = 0.1 µF Min 5.0V 1 0.9 0.86 0.85 ms Max 5.0V 1 1.1 1.14 1.15 ms Output Pulse Width µs REXT = 10 kΩ CPD Power Dissipation 87 pF Capacitance (Note 6) CIN Maximum Input 12 20 20 20 pF 6 10 10 10 pF Capacitance (Pins 7 & 15) CIN Maximum Input Capacitance (Other Inputs) Note 6: CPD determines the no load dynamic power consumption, PD = CPD VCC2f + ICC VCC, and the no load dynamic current consumption, IS = CPD V CCf + ICC. www.fairchildsemi.com 4 MM74HC221A Theory of Operation FIGURE 1. TRIGGER OPERATION It should be noted that in the quiescent state CEXTis fully charged to VCC causing the current through resistor REXT to be zero. Both comparators are “off” with the total device current due only to reverse junction leakages. An added feature of the MM74HC221 is that the output latch is set via the input trigger without regard to the capacitor voltage. Thus, propagation delay from trigger to Q is independent of the value of CEXT, REXT, or the duty cycle of the input waveform. As shown in Figure 1 and the logic diagram before an input trigger occurs, the monostable is in the quiescent state with the Q output LOW, and the timing capacitor CEXT completely charged to VCC. When the trigger input A goes from VCC to GND (while inputs B and clear are held to VCC) a valid trigger is recognized, which turns on comparator C1 and N-channel transistor N11. At the same time the output latch is set. With transistor N1 on, the capacitor CEXT rapidly discharges toward GND until VREF1 is reached. At this point the output of comparator C1 changes state and transistor N1 turns off. Comparator C1 then turns off while at the same time comparator C2 turns on. With transistor N1 off, the capacitor CEXT begins to charge through the timing resistor, REXT, toward VCC. When the voltage across CEXT equals VREF2, comparator C2 changes state causing the output latch to reset (Q goes LOW) while at the same time disabling comparator C2. This ends the timing cycle with the monostable in the quiescent state, waiting for the next trigger. The MM74HC221 is non-retriggerable and will ignore input transitions on A and B until it has timed out 3 and 4. RESET OPERATION These one shots may be reset during the generation of the output pulse. In the reset mode of operation, an input pulse on clear sets the reset latch and causes the capacitor to be fast charged to VCC by turning on transistor Q1 5. When the voltage on the capacitor reaches VREF2, the reset latch will clear and then be ready to accept another pulse. If the clear input is held LOW, any trigger inputs that occur will be inhibited and the Q and Q outputs of the output latch will not change. Since the Q output is reset when an input low level is detected on the Clear input, the output pulse T can be made significantly shorter than the minimum pulse width specification. A valid trigger is also recognized when trigger input B goes from GND to VCC (while input A is at GND and input clear is at VCC2). The MM74HC221 can also be triggered when clear goes from GND to VCC (while A is at Gnd and B is at VCC6). 5 www.fairchildsemi.com MM74HC221A Typical Output Pulse Width vs. Timing Components Typical 1ms Pulse Width Variation vs. Supply Typical Distribution of Output Pulse Width, Part to Part Minimum REXT vs. Supply Voltage Typical 1 ms Pulse Width Variation vs. Temperature Note: R and C are not subjected to temperature. The C is polypropylene. www.fairchildsemi.com 6 MM74HC221A Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow Package Number M16A 7 www.fairchildsemi.com MM74HC221A Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D www.fairchildsemi.com 8 MM74HC221A Dual Non-Retriggerable Monostable Multivibrator Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Package Number N16E Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. www.fairchildsemi.com 9 www.fairchildsemi.com