ZHCSX07B November 2004 – August 2024 CD74HC4538-Q1
PRODUCTION DATA
請參考 PDF 數(shù)據(jù)表獲取器件具體的封裝圖。
An external resistor (RX) and external capacitor (CX) control the timing and 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-to-output transition and the propagation delay from reset input-to-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 input 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 nontriggerable 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 (τ) can be calculated from τ = (0.7) RX, CX; RMIN is 5 k?. CMIN is 0 pF.