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| CD54/74HC4538, CD54/74HCT4538 Data sheet acquired from Harris Semiconductor SCHS123B June 1998 - Revised March 2002 High Speed CMOS Logic Dual Retriggerable Precision Monostable Multivibrator Description The 'HC4538 and 'HCT4538 are dual retriggerable/resettable monostable precision multivibrators for fixed voltage timing applications. An external resistor (RX) and an external capacitor (CX) control the timing and the accuracy for the circuit. Adjustment of RX and CX provides a wide range of output pulse widths from the Q and Q terminals. The propagation delay from trigger input-tooutput transition and the propagation delay from reset inputto-output transition are independent of RX and CX. Leading-edge triggering (A) and trailing edge triggering (B) inputs are provided for triggering from either edge of the input pulse. An unused "A" input should be tied to GND and an unused B should be tied to VCC. On power up the IC is reset. Unused resets and sections must be terminated. In normal operation the circuit retriggers on the application of each new trigger pulse. To operate in the non-triggerable mode Q is connected to B when leading edge triggering (A) is used or Q is connected to A when trailing edge triggering (B) is used. The period () can be calculated from = (0.7) RX, CX; RMIN is 5k. CMIN is 0pF. Features * Retriggerable/Resettable Capability * Trigger and Reset Propagation Delays Independent of RX, CX * Triggering from the Leading or Trailing Edge * Q and Q Buffered Outputs Available * Separate Resets * Wide Range of Output Pulse Widths * Schmitt Trigger Input on A and B Inputs * Retrigger Time is Independent of CX * Fanout (Over Temperature Range) - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads * Wide Operating Temperature Range . . . -55oC to 125oC * Balanced Propagation Delay and Transition Times * Significant Power Reduction Compared to LSTTL Logic ICs * HC Types - 2V to 6V Operation - High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V * HCT Types - 4.5V to 5.5V Operation - Direct LSTTL Input Logic Compatibility, VIL= 0.8V (Max), VIH = 2V (Min) - CMOS Input Compatibility, Il 1A at VOL, VOH [ /Title (CD54 HC453 8, CD74 HC453 8, CD74 HCT45 38) /Subject (High Speed CMOS Logic Ordering Information PART NUMBER CD54HC4538F CD54HC4538F3A CD74HC4538E CD74HC4538M CD74HC4538NSR CD54HCT4538F3A TEMP. RANGE (oC) -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 PACKAGE 16 Ld CERDIP 16 Ld CERDIP 16 Ld PDIP 16 Ld SOIC 16 Ld SOP 16 Ld CERDIP 16 Ld PDIP 16 Ld SOIC Pinout CD54HC4538, CD54HCT4538 (CERDIP) CD74HC4538 (PDIP, SOIC, SOP) CD74HCT4538 (PDIP, SOIC) TOP VIEW 1CX 1 1RXCX 2 1R 3 1A 4 1B 5 1Q 6 1Q 7 GND 8 16 VCC 15 2CX 14 2RXCX 13 2R 12 2A 11 2B 10 2Q 9 2Q CD74HCT4538E CD74HCT4538M NOTES: 1. When ordering, use the entire part number. Add the suffix 96 to obtain the variant in the tape and reel. 2. Wafer and die for this part number is available which meets all electrical specifications. Please contact your local TI sales office or customer service for ordering information. CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. Copyright (c) 2002, Texas Instruments Incorporated 1 CD54/74HC4538, CD54/74HCT4538 Functional Diagram 1Cx 1 1Cx 4 1A 5 1B 3 1R 13 12 2A 11 2B 2Cx 15 GND = 8 VCC = 16 2Cx 2RxCx 14 VCC 2Rx MONO 2 9 2Q 10 2Q MONO 1 7 1Q 2 1RxCx 6 1Q 1Rx VCC 2R TRUTH TABLE R2 INPUTS R L X X H H A X H X L B X X L H Q L L L OUTPUTS Q H D CL R1 CL p n CL CL Q p n CL CL p n CL Q H H R1 NOTE: 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. FIGURE 1. FF DETAIL 2 CD54/74HC4538, CD54/74HCT4538 16 VCC VCC VCC VCC RX 2(14) CX 1(15) R2 VCC R1 + COMP II 6(10) Q - 8 VCC HIGH Z 7(9) Q 3(13) R VCC 4(12) A 5(11) B D R1 CL FF CL R2 Q Q FIGURE 2. LOGIC DIAGRAM (1 MONO) FUNCTIONAL TERMINAL CONNECTIONS VCC TO TERMINAL NUMBER FUNCTION Leading-Edge Trigger/Retriggerable Leading-Edge Trigger/Non-Retriggerable Trailing-Edge Trigger/Retriggerable Trailing-Edge Trigger/Non-Retriggerable NOTES: 3. A retriggerable one-shot multivibrator has an output pulse width which is extended one full time period (T) after application of the last trigger pulse. 4. A non-triggerable one-shot multivibrator has a time period (T) referenced from the application of the first trigger pulse. MONO1 3, 5 3 3 3 MONO2 11, 13 13 13 13 4 12 GND TO TERMINAL NUMBER MONO1 MONO2 INPUT PULSE TO TERMINAL NUMBER MONO1 4 4 5 5 MONO2 12 12 11 11 4-6 12-10 5-7 11-9 OTHER CONNECTIONS MONO1 MONO2 T T FIGURE 3. INPUT PULSE TRAIN FIGURE 4. RETRIGGERABLE MODE PULSE WIDTH (A MODE) FIGURE 5. NON-RETRIGGERABLE MODE PULSE WIDTH (A MODE) 3 CD54/74HC4538, CD54/74HCT4538 Absolute Maximum Ratings DC Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V DC Input Diode Current, IIK For VI < -0.5V or VI > VCC + 0.5V . . . . . . . . . . . . . . . . . . . . . .20mA DC Output Diode Current, IOK For VO < -0.5V or VO > VCC + 0.5V . . . . . . . . . . . . . . . . . . . .20mA DC Output Source or Sink Current per Output Pin, IO For VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . . . . . . . . . . . .25mA DC VCC or Ground Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . .50mA Thermal Information Package Thermal Impedance, JA (see Note 7): PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67oC/W SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73oC/W SOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64oC/W Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300oC (SOIC - Lead Tips Only) Operating Conditions Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC Supply Voltage Range, VCC (Note 5) HC Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2V to 6V HCT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V DC Input or Output Voltage, VI, VO . . . . . . . . . . . . . . . . . 0V to VCC Input Rise and Fall Times, tr, tf Reset Input: 2V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000ns (Max) 4.5V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500ns (Max) 6V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400ns (Max) Trigger Inputs A or B: 2V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unlimited (Max) 4.5V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unlimited (Max) 6V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unlimited (Max) External Timing Resistor, RX (Note 6) . . . . . . . . . . . . . . . .5k (Min) External Timing Capacitor, CX (Note 6) . . . . . . . . . . . . . . . . . 0 (Min) CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. NOTES: 5. Unless otherwise specified, all voltages are referenced to ground. 6. The maximum allowable values of RX and CX are a function of leakage of capacitor CX, the leakage of the 'HC4538, and leakage due to board layout and surface resistance. Values of RX and CX should be chosen so that the maximum current into pin 2 or pin 14 is 30mA. Susceptibility to externally induced noise signals may occur for RX > 1M. 7. The package thermal impedance is calculated in accordance with JESD 51-7. DC Electrical Specifications TEST CONDITIONS PARAMETER HC TYPES High Level Input Voltage VIH 2 4.5 6 Low Level Input Voltage VIL 2 4.5 6 High Level Output Voltage CMOS Loads High Level Output Voltage TTL Loads VOH VIH or VIL -0.02 -0.02 -0.02 -4 -5.2 2 4.5 6 4.5 6 1.5 3.15 4.2 1.9 4.4 5.9 3.98 5.48 0.5 1.35 1.8 1.5 3.15 4.2 1.9 4.4 5.9 3.84 5.34 0.5 1.35 1.8 1.5 3.15 4.2 1.9 4.4 5.9 3.7 5.2 0.5 1.35 1.8 V V V V V V V V V V V V SYMBOL VI (V) IO (mA) VCC (V) 25oC MIN TYP MAX -40oC TO 85oC -55oC TO 125oC MIN MAX MIN MAX UNITS 4 CD54/74HC4538, CD54/74HCT4538 DC Electrical Specifications (Continued) TEST CONDITIONS PARAMETER Low Level Output Voltage CMOS Loads Low Level Output Voltage TTL Loads Input Leakage Current A, B, R Input Leakage Current RXCX (Note 9) Quiescent Device Current Active Device Current Q = High & Pins 2, 14 at VCC/4 HCT TYPES High Level Input Voltage Low Level Input Voltage High Level Output Voltage CMOS Loads High Level Output Voltage TTL Loads Low Level Output Voltage CMOS Loads Low Level Output Voltage TTL Loads Input Leakage Current Input Leakage Current RXCX (Note 9) Quiescent Device Current Active Device Current Q = High & Pins 2, 14 at VCC/4 Additional Quiescent Device Current Per Input Pin: 1 Unit Load NOTES: 8. For dual-supply systems theoretical worst case (VI = 2.4V, VCC = 5.5V) specification is 1.8mA. 9. When testing IIL the Q output must be high. If Q is low (device not triggered) the pull-up P device will be ON and the low resistance path from VDD to the test pin will cause a current far exceeding the specification. ICC ICC VCC or GND VCC or GND VCC -2.1 II VCC and GND VOL VIH or VIL VIH VIL VOH VIH or VIL -0.02 4.5 to 5.5 4.5 to 5.5 4.5 2 4.4 0.8 2 4.4 0.8 2 4.4 0.8 V V V ICC ICC VCC or GND VCC or GND II VCC or GND SYMBOL VOL VI (V) VIH or VIL IO (mA) 0.02 0.02 0.02 4 5.2 25oC MIN TYP MAX 0.1 0.1 0.1 0.26 0.26 0.1 0.05 -40oC TO 85oC -55oC TO 125oC MIN MAX 0.1 0.1 0.1 0.33 0.33 1 0.5 MIN MAX 0.1 0.1 0.1 0.4 0.4 1 0.5 UNITS V V V V V V A A VCC (V) 2 4.5 6 4.5 6 6 6 0 0 6 6 - - 8 0.6 - 80 0.8 - 160 1 A mA -4 4.5 3.98 - - 3.84 - 3.7 - V 0.02 4.5 - - 0.1 - 0.1 - 0.1 V 4 4.5 - - 0.26 - 0.33 - 0.4 V - 5.5 5.5 - 0.1 0.05 - 1 0.5 - 1 0.5 A A 0 0 5.5 5.5 - - 8 0.6 - 80 0.8 - 160 1 A mA ICC (Note 8) - 4.5 to 5.5 - 100 360 - 450 - 490 A 5 CD54/74HC4538, CD54/74HCT4538 HCT Input Loading Table INPUT All UNIT LOADS 0.5 NOTE: Unit Load is ICC limit specified in DC Electrical Table, e.g. 360A max at 25oC. Prerequisite for Switching Specifications 25oC PARAMETER HC TYPES Input Pulse Widths A, B tWH, tWL 2 4.5 6 R tWL 2 4.5 6 Reset Recovery Time tREC 2 4.5 6 Retrigger Time (Figure 11) HCT TYPES Input Pulse Widths A, B R Reset Recovery Time Retrigger Time (Figure 11) tWL tREC trr tWH, tWL 4.5 4.5 4.5 5 16 20 5 175 20 25 5 24 30 5 ns ns ns ns trr 5 80 16 14 80 16 14 5 5 5 175 100 20 17 100 20 17 5 5 5 120 24 20 120 24 20 5 5 5 ns ns ns ns ns ns ns ns ns ns SYMBOL VCC (V) MIN TYP MAX -40oC TO 85oC MIN TYP MAX -55oC TO 125oC MIN TYP MAX UNITS 6 CD54/74HC4538, CD54/74HCT4538 Switching Specifications CL = 50pF, Input tr, tf = 6ns, RX = 10K, CX = 0 25oC PARAMETER HC TYPES Propagation Delay A, B to Q tPLH CL = 50pF 2 4.5 CL = 15pF CL = 50pF A, B to Q tPHL CL = 50pF 5 6 2 4.5 CL = 15pF CL = 50pF R to Q tPHL CL = 50pF 5 6 2 4.5 CL = 15pF CL = 50pF R to Q tPLH CL = 50pF 5 6 2 4.5 CL = 15pF CL = 50pF Output Transition Time tTLH, tTHL CL = 50pF 5 6 2 4.5 6 Output Pulse Width RX = 10k, CX = 0.1F Output Pulse Width Match, Same Package Power Dissipation Capacitance (Notes 10, 11) Input Capacitance HCT TYPES Propagation Delay A, B to Q tPLH CL = 50pF CL = 15pF A, B to Q tPHL CL = 50pF CL = 15pF 4.5 5 4.5 5 23 23 55 55 69 69 83 83 ns ns ns ns 0.64 0.63 5 21 21 21 21 1 136 250 50 43 250 50 43 250 50 43 250 50 43 75 15 13 0.78 0.77 0.612 0.602 315 63 54 315 63 54 315 63 54 315 63 54 95 19 16 0.812 0.798 0.605 0.595 375 75 64 375 75 64 375 75 64 375 75 64 110 22 19 0.819 0.805 ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ms ms % pF SYMBOL TEST CONDITIONS VCC (V) MIN TYP MAX -40oC TO 85oC MIN MAX -55oC TO 125oC MIN MAX UNITS CL = 50pF 3 5 CPD CI CL = 15pF CL = 50pF - 10 - 10 - 10 - 10 pF 7 CD54/74HC4538, CD54/74HCT4538 Switching Specifications CL = 50pF, Input tr, tf = 6ns, RX = 10K, CX = 0 (Continued) 25oC PARAMETER R to Q SYMBOL tPHL TEST CONDITIONS CL = 50pF CL = 15pF R to Q tPLH CL = 50pF CL = 15pF Output Transition Time Output Pulse Width RX = 10k, CX = 0.1F Output Pulse Width Match, Same Package Power Dissipation Capacitance (Notes 10, 11) Input Capacitance NOTES: 10. CPD is used to determine the dynamic power consumption, per one shot. 11. PD = (CPD + CX) VCC2 fi (CL VCC2 fO) where fi = input frequency, fO = output frequency, CL = output load capacitance, I CX = external capacitance VCC = supply voltage assuming fi tTLH, tTHL CL = 50pF CL = 50pF CL = 15pF CL = 50pF VCC (V) 4.5 5 4.5 5 4.5 5 MIN 0.63 TYP 17 21 1 134 MAX 40 50 15 0.77 -40oC TO 85oC MIN 0.602 MAX 50 63 19 0.798 -55oC TO 125oC MIN 0.595 MAX 60 75 22 0.805 UNITS ns ns ns ns ns ms % pF CPD CI 5 - - - - - - - 10 - 10 - 10 - 10 pF Test Circuits and Waveforms tr = 6ns INPUT 90% 50% 10% tf = 6ns VCC tr = 6ns INPUT GND 2.7V 1.3V 0.3V tf = 6ns 3V GND tTLH 90% tTHL tTLH 90% 50% 10% tPHL tPLH tTHL INVERTING OUTPUT INVERTING OUTPUT tPHL tPLH 1.3V 10% FIGURE 6. HC AND HCU TRANSITION TIMES AND PROPAGATION DELAY TIMES, COMBINATION LOGIC FIGURE 7. HCT TRANSITION TIMES AND PROPAGATION DELAY TIMES, COMBINATION LOGIC 8 CD54/74HC4538, CD54/74HCT4538 Typical Performance Curves HC4538 - TA11646C TA = 25oC HCT4538 - TA13646C TA = 25oC 0.70 0.70 10k, 10nF K FACTOR K FACTOR 0.69 10k, 100nF 100k, 100nF 0.69 10k, 10nF 10k, 100nF 0.68 100k, 100nF 0.68 100k, 10nF 100k, 10nF 0.67 0.67 2 3 4 4.5 5 5.5 6 2 3 4 4.5 5 5.5 6 VCC, DC SUPPLY VOLTAGE (V) VCC, DC SUPPLY VOLTAGE (V) FIGURE 8. K FACTOR vs DC SUPPLY VOLTAGE (VCC) - V FIGURE 9. K FACTOR vs DC SUPPLY VOLTAGE (VCC) - V 104 trr, TYP MIN RETRIGGER TIME (ns) 1.3 1.2 1.1 K FACTOR 1.0 0.9 0.8 0.7 0.6 10 102 103 HC/HCT4538 VCC = 5V, TA = 25oC TA = 25oC RX = 10k 103 VCC = 4.5V 102 VCC = 5V 2k 10k 100k 104 105 10 102 103 104 CX, TIMING CAPACITANCE (pF) CX, TIMING CAPACITANCE (pF) FIGURE 10. K FACTOR vs CX FIGURE 11. MINIMUM RETRIGGER TIME vs TIMING CAPACITANCE 9 CD54/74HC4538, CD54/74HCT4538 Power-Down Mode During a rapid power-down condition, as would occur with a power-supply short circuit with a poorly filtered power supply, the energy stored in CX could discharge into Pin 2 or 14. To aviod possible device damage in this mode, when CX is 0.5F, a protection diode with a 1 ampere or higher rating (1N5395 or equivalent) and a separate ground return for CX should be provided as shown in Figure 12. An alternate protection method is shown in Figure 13, where a 51 current-limiting resistor is inserted in series with CX. Note that a small pulse width decrease will occur however, and RX must be appropriately increased to obtain the originally desired pulse width. VCC IN5395 OR EQUIVALENT VCC RX 2(14) 16 RX 2(14) 16 CX 0.5F + 51 CX 0.5F 1(15) 8 1(15) 8 FIGURE 12. RAPID POWER-DOWN PROTECTION CIRCUIT FIGURE 13. ALTERNATE RAPID POWER-DOWN PROTECTION CIRCUIT 10 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI's terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and applications using TI components. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI. 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