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DM74123N 数据表(PDF) 3 Page - National Semiconductor (TI) |
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DM74123N 数据表(HTML) 3 Page - National Semiconductor (TI) |
3 / 6 page Switching Characteristics at VCC e 5V and TA e 25 C DM54123 DM74123 Symbol Parameter From (Input) CL e 15 pF RL e 400X CL e 15 pF RL e 400X Units To (Output) CEXT e 0 pF REXT e 5kX CEXT e 1000 pF REXT e 10 KX Min Max Min Max tPLH Propagation Delay Time A to Q 33 33 ns Low to High Level Output tPLH Propagation Delay Time B to Q 28 28 ns Low to High Level Output tPHL Propagation Delay Time A to Q 40 40 ns High to Low Level Output tPHL Propagation Delay Time BtoQ 36 36 ns High to Low Level Output tPLH Propagation Delay Time Clear to Q 40 40 ns Low to High Level Output tPHL Propagation Delay Time Clear to Q 27 27 ns High to Low Level Output tW(out) Output Pulse Width A or B to Q 308 376 308 376 m s CECT e 1000 pF REXT e 10 kX Operating Rules 1 An external resistor (RX) and external capacitor (CX) are required for proper operation The value of CX may vary from 0 to any necessary value For small time constants high-grade mica glass polypropylene polycarbonate or polystyrene material capacitors may be used For large time constants use tantalum or special aluminum capaci- tors If the timing capacitors have leakages approaching 100 nA or if stray capacitance from either terminal to ground is greater than 50 pF the timing equations may not represent the pulse width the device generates 2 When an electrolytic capacitor is used for CX a switching diode is often required for standard TTL one-shots to pre- vent high inverse leakage current (Figure 1) However its use in general is not recommended with retriggerable op- eration 3 The output pulse width (TW) for CX l 1000 pF is defined as follows TW e KRX CX (1 a 07RX) where RX is in Kilo-ohm CX is in pico Farad TW is in nano second K 028 TLF6539 – 3 FIGURE 1 4 For CX k 1000 pF see Figure 2 for TW vs CX family curves with RX as a parameter Pulse Width vs RX and CX TLF6539 – 4 FIGURE 2 5 To obtain variable pulse width by remote trimming the following circuit is recommended TLF6539 – 5 Note ‘‘Rremote’’ should be as close to the one-shot as possible FIGURE 3 3 |
类似零件编号 - DM74123N |
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类似说明 - DM74123N |
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