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SN74HC245PWRE4 Datasheet(PDF) 7 Page - Texas Instruments |
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SN74HC245PWRE4 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 29 page VOLTAGE WAVEFORM INPUT RISE AND FALL TIMES 50% 50% 10% 10% 90% 90% VCC 0 V tr t Input f VOLTAGE WAVEFORMS PROPAGATION DELAY AND OUTPUT TRANSITION TIMES 50% 50% 50% 10% 10% 90% 90% VCC VOH VOL 0 V tr t Input f In-Phase Output 50% tPLH tPHL 50% 50% 10% 10% 90% 90% VOH VOL t t r f tPHL tPLH Out-of-Phase Output 50% 10% 90% VCC ≈VCC VOL 0 V Output Control (Low-Level Enabling) Output Waveform 1 (See Note B) 50% tPZL tPLZ VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS VOH ≈0 V 50% 50% tPZH tPHZ Output Waveform 2 (See Note B) ≈VCC Test Point From Output Under Test CL (see Note A) 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 R S1 L Closed Open S2 Open Closed Closed Open 50 pF or 150 pF Open Open −− SN54HC245, SN74HC245 www.ti.com SCLS131E – DECEMBER 1982 – REVISED SEPTEMBER 2015 7 Parameter Measurement Information 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. Figure 3. Load Circuit and Voltage Waveforms Copyright © 1982–2015, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: SN54HC245 SN74HC245 |
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