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SN74ACT245DWR Scheda tecnica(PDF) 4 Page - Texas Instruments |
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SN74ACT245DWR Scheda tecnica(HTML) 4 Page - Texas Instruments |
4 / 15 page SN54ACT245, SN74ACT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCAS452E – SEPTEMBER 1994 – REVISED OCTOBER 2002 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 switching characteristics over recommended operating free-air temperature range, VCC = 5 V ± 0.5 V (unless otherwise noted) (see Figure 1) PARAMETER FROM TO TA = 25°C SN54ACT245 SN74ACT245 UNIT PARAMETER (INPUT) (OUTPUT) MIN TYP MAX MIN MAX MIN MAX UNIT tPLH AorB BorA 1 4 7.5 1 9 1.5 8 ns tPHL A or B B or A 1 4 8 1 10 1 9 ns tPZH OE AorB 1 5 10 1 12 1.5 11 ns tPZL OE A or B 1 5.5 10 1 13 1.5 12 ns tPHZ OE AorB 1 5.5 10 1 12 1 11 ns tPLZ OE A or B 1 5 10 1 12 1.5 11 ns operating characteristics, VCC = 5 V, TA = 25°C PARAMETER TEST CONDITIONS TYP UNIT Cpd Power dissipation capacitance CL = 50 pF, f = 1 MHz 45 pF PARAMETER MEASUREMENT INFORMATION LOAD CIRCUIT tPLH tPHL 3 V 0 V 50% VCC 50% VCC VOH VOL Input Output VOLTAGE WAVEFORMS From Output Under Test CL = 50 pF (see Note A) S1 2 × VCC 500 Ω 500 Ω Open tPLH/tPHL tPLZ/tPZL tPHZ/tPZH Open 2 × VCC Open TEST S1 Output Control (low-level enabling) Output Waveform 1 S1 at 2 × VCC (see Note B) Output Waveform 2 S1 at Open (see Note B) VOL VOH tPZL tPZH tPLZ tPHZ ≈VCC 0 V 50% VCC VOL + 0.3 V 50% VCC ≈0 V VOLTAGE WAVEFORMS VOH – 0.3 V 3 V 1.5 V 1.5 V 1.5 V 1.5 V NOTES: A. CL includes probe and jig capacitance. B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns. D. The outputs are measured one at a time with one input transition per measurement. Figure 1. Load Circuit and Voltage Waveforms |
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