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74CBTLV3245 데이터시트(PDF) 9 Page - NXP Semiconductors |
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74CBTLV3245 데이터시트(HTML) 9 Page - NXP Semiconductors |
9 / 18 page 74CBTLV3245 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 2 — 15 December 2011 9 of 18 NXP Semiconductors 74CBTLV3245 8-bit bus switch with output enable 10. Dynamic characteristics [1] All typical values are measured at Tamb =25 C and at nominal VCC. [2] The propagation delay is the calculated RC time constant of the on-state resistance of the switch and the load capacitance, when driven by an ideal voltage source (zero output impedance). [3] tpd is the same as tPLH and tPHL. [4] ten is the same as tPZH and tPZL. [5] tdis is the same as tPHZ and tPLZ. 11. Waveforms Table 8. Dynamic characteristics GND = 0 V; for test circuit see Figure 17 Symbol Parameter Conditions Tamb = 40 C to +85 C Tamb = 40 C to +125 C Unit Min Typ[1] Max Min Max tpd propagation delay An to Bn or Bn to An; see Figure 15 [2][3] VCC = 2.3 V to 2.7 V - - 0.13 - 0.20 ns VCC = 3.0 V to 3.6 V - - 0.20 - 0.31 ns ten enable time OE to An or Bn; see Figure 16 [4] VCC = 2.3 V to 2.7 V 1.0 3.4 5.5 1.0 8.0 ns VCC = 3.0 V to 3.6 V 1.0 3.0 4.9 1.0 7.0 ns tdis disable time OE to An or Bn; see Figure 16 [5] VCC = 2.3 V to 2.7 V 1.0 3.0 5.5 1.0 8.0 ns VCC = 3.0 V to 3.6 V 1.0 3.4 5.8 1.0 8.5 ns Measurement points are given in Table 9. Logic levels: VOL and VOH are typical output voltage levels that occur with the output load. Fig 15. The data input (An, Bn) to output (Bn, An) propagation delay times 001aai367 VM VM VM VM VI input 0 V VOH output VOL tPHL tPLH Table 9. Measurement points Supply voltage Input Output VCC VM VI tr = tf VM VX VY 2.3 V to 2.7 V 0.5VCC VCC 2.0 ns 0.5VCC VOL +0.15V VOH 0.15 V 3.0 V to 3.6 V 0.5VCC VCC 2.0 ns 0.5VCC VOL +0.3 V VOH 0.3 V |
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