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SN74HCT257 Folha de dados(PDF) 5 Page - Texas Instruments |
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SN74HCT257 Folha de dados(HTML) 5 Page - Texas Instruments |
5 / 9 page SN54HCT257, SN74HCT257 QUADRUPLE 2LINE TO 1LINE DATA SELECTORS/MULTIPLEXERS WITH 3STATE OUTPUTS SCLS072D − NOVEMBER 1988 − REVISED SEPTEMBER 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 WAVEFORMS OUTPUT AND 3-STATE BIDIRECTIONAL I/O PROPAGATION DELAY TIME 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 |
Nº de peça semelhante - SN74HCT257 |
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Descrição semelhante - SN74HCT257 |
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