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SN74HCT245DBRG4 데이터시트(PDF) 5 Page - Texas Instruments |
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SN74HCT245DBRG4 데이터시트(HTML) 5 Page - Texas Instruments |
5 / 23 page SN54HCT245, SN74HCT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCLS020E – MARCH 1984 – REVISED AUGUST 2003 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION From Output Under Test RL VCC S1 S2 LOAD CIRCUIT PARAMETER CL tPZH tpd or tt tdis ten tPZL tPHZ tPLZ 1 k Ω 1 k Ω 50 pF or 150 pF 50 pF Open Closed RL S1 Closed Open S2 Open Closed Closed Open 50 pF or 150 pF Open Open –– NOTES: A. CL includes probe and test-fixture 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. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 6 ns, tf = 6 ns. D. The outputs are measured one at a time with one input transition per measurement. E. tPLZ and tPHZ are the same as tdis. F. tPZL and tPZH are the same as ten. G. tPLH and tPHL are the same as tpd. CL (see Note A) Test Point VOLTAGE WAVEFORM INPUT RISE AND FALL TIMES 1.3 V 1.3 V 0.3 V 0.3 V 2.7 V 2.7 V 3 V 0 V tr tf Input VOLTAGE WAVEFORMS PROPAGATION DELAY AND OUTPUT RISE AND FALL TIMES 1.3 V 1.3 V 1.3 V 10% 10% 90% 90% 3 V VOH VOL 0 V tr tf Input In-Phase Output 1.3 V tPLH tPHL 1.3 V 1.3 V 10% 10% 90% 90% VOH VOL tr tf tPHL tPLH Out-of- Phase Output 1.3 V 10% 90% 3 V ≈VCC VOL 0 V Output Control (Low-Level Enabling) Output Waveform 1 (See Note B) 1.3 V tPZL tPLZ VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS VOH ≈0 V 1.3 V 1.3 V tPZH tPHZ Output Waveform 2 (See Note B) Figure 1. Load Circuit and Voltage Waveforms |
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