MC74HC4538A Motorola, MC74HC4538A Datasheet
MC74HC4538A
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MC74HC4538A Summary of contents
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... A1 TRIGGER 5 INPUTS B1 3 RESET 1 A2 TRIGGER INPUTS B2 RESET 2 PIN PIN 8 = GND R X AND C X ARE EXTERNAL COMPONENTS PIN 1 AND PIN 15 MUST BE HARD WIRED TO GND 10/95 Motorola, Inc. 1995 MC54/74HC4538A 3– ...
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... Power Down Considerations). Susceptibility to externally induced noise signals may occur for R x > 1 The HC4538A will function at 2.0 V but for optimum pulse width stability should be above 3.0 V. NOTE: Information on typical parametric values can be found in Chapter 2 of the Motorola High–Speed CMOS Data Book (DL129/D). MOTOROLA Î Î Î Î Î Î ...
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... A A Î Î Î Î Î Î Î Î Î Î Î Î Î Î MOTOROLA ...
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... NOTE: For propagation delays with loads other than 50 pF, and information on typical parametric values, see Chapter 2 of the Motorola High– Speed CMOS Data Book (DL129/D). ...
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... CAPACITANCE ( F) Timing Capacitance MOTOROLA 100 ...
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... MC54/74HC4538A 1.1 1.05 1 0.95 0.9 0.85 0.8 – 75 1.03 1.02 1.01 1 0.99 0.98 0.97 – 75 MOTOROLA 0 – 50 – 100 AMBIENT TEMPERATURE ( C) Figure 4. Normalized Output Pulse Width versus Power Supply Voltage 0 5 4.5 V – 50 – ...
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... Figure 50 90% 10% t w(L) t rec 50% 50% 50% Figure 7. TEST POINT OUTPUT DEVICE UNDER TEST * Includes all probe and jig capacitance Figure 8. Test Circuit 3–7 MC54/74HC4538A V CC GND V CC GND V CC GND V CC GND V CC GND + t rr (RETRIGGERED PULSE) MOTOROLA ...
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... RESET POWER ON RESET MOTOROLA PIN DESCRIPTIONS tors (see the Block Diagram). Polystyrene capacitors are recommended for optimum pulse width control. Electrolytic capacitors are not recommended due to high leakages associated with these type capacitors. GND (Pins 1 and 15) External ground. The external timing capacitors discharge to ground through these pins ...
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... Once the voltage across C x charges to above the low- er reference voltage, the lower reference circuit will go low allowing the monostable multivibrator to be retriggered. TRIGGER CYCLE (A INPUT) (B INPUT ref UPPER 18 19 Figure 10. Timing Diagram 3–9 MC54/74HC4538A RESET RETRIGGER MOTOROLA ...
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... charging up toward the reference volt- age of the upper reference circuit (#21). When a reset Figure 11. Discharge Protection During Power Down MOTOROLA occurs, the output of the reset latch goes low (#22), turning on transistor M1. Thus allowed to quickly charge (#23) to await the next trigger signal. ...
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... Figure 13. Non–retriggerable Monostable Circuitry ONE–SHOT SELECTION GUIDE 100 100 Limited operating voltage (2 – 3–11 MC54/74HC4538A RESET = RESET = MIN MOTOROLA ...
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... 0.25 (0.010) –A – –T – SEATING PLANE 0.25 (0.010 MOTOROLA OUTLINE DIMENSIONS J SUFFIX CERAMIC PACKAGE CASE 620–10 ISSUE V –B – 0.25 (0.010 SUFFIX PLASTIC PACKAGE CASE 648–08 ...
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... Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different applications. All operating parameters, including “ ...