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74LVC544ADB Folha de dados(PDF) 7 Page - NXP Semiconductors |
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74LVC544ADB Folha de dados(HTML) 7 Page - NXP Semiconductors |
7 / 10 page Philips Semiconductors Product specification 74LVC544A Octal D-type registered transceiver, inverting (3-State) 1998 Jul 29 7 AC WAVEFORMS VM = 1.5V at VCC w 2.7V VM = 0.5V * VCC at VCC t 2.7V VOL and VOH are the typical output voltage drop that occur with the output load. VX = VOL + 0.3V at VCC w 2.7V VX = VOL + 0.1VCC at VCC < 2.7V VY = VOH – 0.3V at VCC w 2.7V VY = VOH – 0.1VCC at VCC < 2.7V An, Bn INPUT VM tPHL tPLH VOL VI VM GND VOH Bn, An OUTPUT SV00737 Figure 1. Input (An, Bn) to output (Bn, An) propagation delays. tw tPHL tPLH LEXX INPUT An, Bn OUTPUT VM VM VM VM VM VI GND VOH VOL SV00738 Figure 2. Latch enable input (LEXX) pulse width, the latch enable input to output (An, Bn) propagation delays. tPLZ tPZL VI OEXX, EXX INPUT GND VCC OUTPUT LOW-to-OFF OFF-to-LOW VOL VOH OUTPUT HIGH-to-OFF OFF-to-HIGH GND outputs enabled outputs enabled outputs disabled tPHZ VM VM VM tPZH VX VY SW00210 Figure 3. 3-State enable and disable times VM An, Bn INPUT VM LEXX, EXX INPUT tSU th NOTE: The shaded areas indicate when the input is permitted to change for predictable output performance. tSU th VI GND VI GND SV00739 Figure 4. Data set-up and hold times for the (An, Bn) input to the LEXX and EXX inputs TEST CIRCUIT PULSE GENERATOR VI RT D.U.T. VO CL 50pF S1 2 x VCC Open GND 500 Ω 500 Ω VCC VI t 2.7V VCC 2.7V – 3.6V 2.7V Test S1 GND tPLZ/tPZL 2 x VCC tPHZ/tPZH tPLH/tPHL Open SY00003 VCC Figure 5. Load circuitry for switching times |
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