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74HC243 数据表(PDF) 11 Page - NXP Semiconductors |
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74HC243 数据表(HTML) 11 Page - NXP Semiconductors |
11 / 17 page 9397 750 13808 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. Product data sheet Rev. 03 — 12 November 2004 11 of 17 Philips Semiconductors 74HC243 Quad bus transceiver; 3-state VM = 0.5 × VI. Fig 7. Waveforms showing the 3-state enable and disable times for input OEB Test data is given in Table 9. Definitions for test circuit: RL = Load resistor. CL = Load capacitance including jig and probe capacitance. RT = Termination resistance should be equal to the output impedance Zo of the pulse generator. Fig 8. Load circuitry for switching times Table 9: Test data Supply Input Load S1 VCC VI tr = tf CL RL tPZL, tPLZ tPZH, tPHZ tPHL, tPLH 2.0 V VCC 6 ns 50 pF 1 k Ω VCC GND open 4.5 V VCC 6 ns 50 pF 1 k Ω VCC GND open 6.0 V VCC 6 ns 50 pF 1 k Ω VCC GND open 5.0 V VCC 6 ns 15 pF 1 k Ω VCC GND open VM OEB input output LOW to OFF OFF to LOW output HIGH to OFF OFF to HIGH VM 001aab956 tf tr 90 % 10 % tPLZ VM tPZL tPHZ tPZH 10 % 90 % outputs disabled outputs enabled outputs enabled open GND VCC VCC VI VO mna232 D.U.T. CL RT RL = 1000 Ω PULSE GENERATOR S1 |
类似零件编号 - 74HC243 |
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类似说明 - 74HC243 |
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