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SN74ALS666DWE4 Datasheet(PDF) 7 Page - Texas Instruments |
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SN74ALS666DWE4 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 12 page SN74ALS666, SN74ALS667 8-BIT D-TYPE TRANSPARENT READ-BACK LATCHES WITH 3-STATE OUTPUTS SDAS227A – JUNE 1984 – REVISED JANUARY 1995 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION LOAD CIRCUIT FOR Q OR Q OUTPUTS From Output Under Test Test Point 500 Ω S1 CL (see Note A) 500 Ω LOAD CIRCUIT FOR D OUTPUTS From Output Under Test Test Point 1 k Ω S1 CL (see Note A) 7 V 1 k Ω 1.3 V 1.3 V 1.3 V 3.5 V 3.5 V 0.3 V 0.3 V th tsu VOLTAGE WAVEFORMS SETUP AND HOLD TIMES Timing Input Data Input 1.3 V 1.3 V 3.5 V 3.5 V 0.3 V 0.3 V High-Level Pulse Low-Level Pulse tw VOLTAGE WAVEFORMS PULSE DURATIONS 1.3 V 1.3 V tPHZ tPLZ 0.3 V tPZL tPZH 1.3 V 1.3 V 1.3 V 1.3 V 3.5 V 0.3 V Output Control (low-level enabling) Waveform 1 S1 Closed (see Note B) Waveform 2 S1 Open (see Note B) [0 V VOH VOL [3.5 V 0.3 V VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS tPHL tPLH tPLH tPHL Input Out-of-Phase Output (see Note D) 1.3 V 1.3 V 1.3 V 1.3 V 1.3 V 1.3 V 3.5 V 0.3 V VOL VOH VOH VOL In-Phase Output VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES 7 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 have the following characteristics: PRR ≤ 1 MHz, tr = tf = 2 ns, duty cycle = 50%. D. When measuring propagation delay times of 3-state outputs, switch S1 is open. Figure 1. Load Circuits and Voltage Waveforms |
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