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74HCT244D 데이터시트(PDF) 8 Page - NXP Semiconductors |
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74HCT244D 데이터시트(HTML) 8 Page - NXP Semiconductors |
8 / 18 page 74HC_HCT244 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 4 — 24 September 2012 8 of 18 NXP Semiconductors 74HC244; 74HCT244 Octal buffer/line driver; 3-state 11. Waveforms Measurement points are given in Table 8. VOL and VOH are typical voltage output levels that occur with the output load. Fig 6. Input (nAn) to output (nYn) propagation delays and output transition times 001aae013 tPLH tPHL VM VM VM VM nYn output nAn input VI GND VOH VOL tTLH tTHL 90 % 10 % Measurement points are given in Table 8. VOL and VOH are typical voltage output levels that occur with the output load. Fig 7. 3-state enable and disable times 001aae014 tPLZ tPHZ outputs disabled outputs enabled VY VX outputs enabled nYn output LOW-to-OFF OFF-to-LOW nYn output HIGH-to-OFF OFF-to-HIGH nOE input VI VOL VOH VCC VM GND GND tPZL tPZH VM VM Table 8. Measurement points Type Input Output VM VM VX VY 74HC244 0.5 V CC 0.5 V CC 0.1 V CC 0.9 V CC 74HCT244 1.3 V 1.3 V 0.1 V CC 0.9 V CC |
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