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MC74HC4538AN Datenblatt(PDF) 9 Page - ON Semiconductor |
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MC74HC4538AN Datenblatt(HTML) 9 Page - ON Semiconductor |
9 / 16 page MC74HC4538A http://onsemi.com 9 PIN DESCRIPTIONS INPUTS A1, A2 (Pins 4, 12) Positive–edge trigger inputs. A rising–edge signal on either of these pins triggers the corresponding multivibrator when there is a high level on the B1 or B2 input. B1, B2 (Pins 5, 11) Negative–edge trigger inputs. A falling–edge signal on either of these pins triggers the corresponding multivibrator when there is a low level on the A1 or A2 input. Reset 1, Reset 2 (Pins 3, 13) Reset inputs (active low). When a low level is applied to one of these pins, the Q output of the corresponding multivibrator is reset to a low level and the Q output is set to a high level. CX1/RX1 and CX2/RX2 (Pins 2 and 14) External timing components. These pins are tied to the common points of the external timing resistors and capacitors (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. OUTPUTS Q1, Q2 (Pins 6, 10) Noninverted monostable outputs. These pins (normally low) pulse high when the multivibrator is triggered at either the A or the B input. The width of the pulse is determined by the external timing components, RX and CX. Q1, Q2 (Pins 7, 9) Inverted monostable outputs. These pins (normally high) pulse low when the multivibrator is triggered at either the A or the B input. These outputs are the inverse of Q1 and Q2. + – + – RxCx VCC M1 2 k Ω M3 M2 A B RESET POWER ON RESET RESET LATCH TRIGGER CONTROL RESET CIRCUIT TRIGGER CONTROL CIRCUIT OUTPUT LATCH UPPER REFERENCE CIRCUIT Vre, UPPER LOWER REFERENCE CIRCUIT Vre, LOWER Q Q C CB Q R VCC Figure 11. Logic Detail (1/2 the Device) |
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Ähnliche Beschreibung - MC74HC4538AN |
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