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SN74HCT373PWLE Datasheet(PDF) 5 Page - Texas Instruments |
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SN74HCT373PWLE Datasheet(HTML) 5 Page - Texas Instruments |
5 / 21 page SN54HCT373, SN74HCT373 OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS SCLS009D – MARCH 1984 – REVISED AUGUST 2003 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION 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 VOH ≈0 V 1.3 V 1.3 V tPZH tPHZ Output Waveform 2 (See Note B) VOLTAGE WAVEFORMS SETUP AND HOLD AND INPUT RISE AND FALL TIMES VOLTAGE WAVEFORMS PULSE DURATIONS th tsu 1.3 V 1.3 V 1.3 V 0.3 V 0.3 V 2.7 V 2.7 V 3 V 3 V 0 V 0 V tr tf Reference Input Data Input 1.3 V High-Level Pulse 1.3 V 3 V 0 V 1.3 V 1.3 V 3 V 0 V tw Low-Level Pulse 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 VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS Test Point 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 –– CL (see Note A) 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. Figure 1. Load Circuit and Voltage Waveforms |
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