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SN74AHC123AMDREP bảng dữ liệu(PDF) 8 Page - Texas Instruments |
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SN74AHC123AMDREP bảng dữ liệu(HTML) 8 Page - Texas Instruments |
8 / 17 page www.ti.com APPLICATION INFORMATION Caution in Use Powerdown Considerations Output Pulse Duration V CC R T C T ToR /C ext ext Terminal ToC ext Terminal tw + K R T C T (1) SN74AHC123A-EP DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR SCLS703A – JULY 2006 – REVISED MARCH 2007 To prevent malfunctions due to noise, connect a high-frequency capacitor between VCC and GND, and keep the wiring between the external components and Cext and Rext/Cext terminals as short as possible. Large values of Cext can cause problems when powering down the SN74AHC123A devices because of the amount of energy stored in the capacitor. When a system containing this device is powered down, the capacitor can discharge from VCC through the protection diodes at pin 2 or pin 14. Current through the input protection diodes must be limited to 30 mA; therefore, the turn-off time of the VCC power supply must not be faster than t = VCC× Cext/30 mA. For example, if VCC = 5 V and Cext = 15 pF, the VCC supply must turn off no faster than t = (5 V) × (15 pF)/30 mA = 2.5 ns. Usually, this is not a problem because power supplies are heavily filtered and cannot discharge at this rate. When a more rapid decrease of VCC to zero occurs, the SN74AHC123A can sustain damage. To avoid this possibility, use external clamping diodes. The output pulse duration (tw) is determined primarily by the values of the external capacitance (CT) and timing resistance (RT). The timing components are connected as shown in Figure 2. Figure 2. Timing-Component Connections The pulse duration is given by: if CT is ≥ 1000 pF, K = 1 or if CT is < 1000 pF, K can be determined from Figure 9 where: tw = pulse duration in ns RT = external timing resistance in kΩ CT = external capacitance in pF K = multiplier factor Equation 1 and Figure 3 can be used to determine values for pulse duration, external resistance, and external capacitance. 8 Submit Documentation Feedback |
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