전자부품 데이터시트 검색엔진 |
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54121 데이터시트(PDF) 3 Page - National Semiconductor (TI) |
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54121 데이터시트(HTML) 3 Page - National Semiconductor (TI) |
3 / 6 page Switching Characteristics at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Outout Load) Symbol Parameter From (Input) Conditions Min Max Units To (Output) tPLH Propagation Delay Time A1 A2 CEXT e 80 pF 70 ns Low to High Level Output to Q RINT to VCC tPLH Propagation Delay Time B to CL e 15 pF 55 ns Low to High Level Output Q RL e 400X tPHL Propagation Delay Time A1 A2 80 ns High to Low Level Output to Q tPHL Propagation Delay Time B 65 ns High to Low Level Output to Q tW(OUT) Output Pulse A1 A2 or B CEXT e 80 pF Width Using the to Q Q RINT to VCC 70 150 ns Internal Timing Resistor RL e 400X CL e 15 pF tW(OUT) Output Pulse A1 A2 CEXT e 0pF Width Using Zero to Q Q RINT to VCC 50 ns Timing Capacitance RL e 400X CL e 15 pF tW(OUT) Output Pulse A1 A2 CEXT e 100 pF Width Using External to Q Q RINT e 10 kX 600 800 ns Timing Resistor RL e 400X CL e 15 pF A1 A2 CEXT e 1 mF to Q Q RINT e 10 kX 68ms RL e 400X CL e 15 pF Operating Rules 1 To use the internal 2 kX timing resistor connect the RINT pin to VCC 2 An external resistor (RX) or the internal resistor (2 kX) and an external capacitor (CX) are required for proper operation The value of CX may vary from 0 to any neces- sary value For small time constants use high-quality mica glass polypropylene polycarbonate or polystyrene capacitors For large time constants use solid tantalum or special aluminum capacitors If the timing capacitors have leakages approaching 100 nA or if stray capaci- tance from either terminal to ground is greater than 50 pF the timing equations may not represent the pulse width the device generates 3 The pulse width is essentially determined by external tim- ing components RX and CX For CX k 1000 pF see Fig- ure 1 design curves on TW as function of timing compo- nents value For CX l1000 pF the output is defined as tW e KRX CX where RX is in Kilo-ohm CX is in pico Farad TW is in nano second K 07 TLF6538 – 2 FIGURE 1 4 If CX is an electrolytic capacitor a switching diode is often required for standard TTL one-shots to prevent high in- verse leakage current (Figure 2) TLF6538 – 3 FIGURE 2 3 |
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