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74HCT253 Datasheet(PDF) 9 Page - NXP Semiconductors |
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74HCT253 Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 17 page 74HC_HCT253_3 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 03 — 22 April 2010 9 of 17 NXP Semiconductors 74HC253; 74HCT253 Dual 4-input multiplexer; 3-state 12. Waveforms Measurement points are given in Table 8. VOL and VOH are typical voltage output levels that occur with the output load. Fig 6. Propagation delays input (Sn, 1In, 2In) to output (nY) and output (nY) transition times 001aal855 VM VM VM VI Sn, 1In, 2ln input GND VOH nY output VOL tPHL tPLH VM tTLH tTHL 10 % 90 % 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 output enable and disable times 001aal856 tPLZ tPHZ outputs disabled outputs enabled outputs enabled output LOW-to-OFF OFF-to-LOW output HIGH-to-OFF OFF-to-HIGH nOE input VOH VCC GND VOL VI tr tf GND VM tPZL tPZH 90 % VM 90 % 10 % 10 % VM Table 8. Measurement points Type Input Output VM VM 74HC253 0.5VCC 0.5VCC 74HCT253 1.3 V 1.3 V |
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