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74HCT257PW Arkusz danych(PDF) 9 Page - NXP Semiconductors |
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74HCT257PW Arkusz danych(HTML) 9 Page - NXP Semiconductors |
9 / 17 page 74HC_HCT257_5 © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 05 — 13 January 2010 9 of 17 NXP Semiconductors 74HC257; 74HCT257 Quad 2-input multiplexer; 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. Propagation delays input (S, nI0, nI1) to output (nY) and output (nY) transition times 001aad477 tPLH tPHL VM VM 90 % 10 % VM VM output nY input S, nI0, nI1 VI GND VOH VOL tTLH tTHL 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 001aac479 tPLZ tPHZ outputs disabled outputs enabled 90 % 10 % outputs enabled OE input VI VCC VOL VOH GND GND VM tPZL tPZH VM VM output LOW-to-OFF OFF-to-LOW output HIGH-to-OFF OFF-to-HIGH tr tf 90 % 10 % Table 8. Measurement points Type Input Output VM VM 74HC257 0.5VCC 0.5VCC 74HCT257 1.3 V 1.3 V |
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