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SN74BCT646DWRG4 数据表(PDF) 8 Page - Texas Instruments |
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SN74BCT646DWRG4 数据表(HTML) 8 Page - Texas Instruments |
8 / 18 page SN54BCT646, SN74BCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3STATE OUTPUTS SCBS037D − AUGUST 1989 − REVISED MAY 2004 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION NOTES: A. CL includes probe and jig capacitance. B. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, tr = tf ≤ 2.5 ns, duty cycle = 50%. C. 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. D. The outputs are measured one at a time, with one transition per measurement. E. When measuring propagation delay times of 3-state outputs, switch S1 is open. F. All parameters and waveforms are not applicable to all devices. From Output Under Test Test Point R1 CL (see Note A) LOAD CIRCUIT FOR TOTEM-POLE OUTPUTS LOAD CIRCUIT FOR 3-STATE AND OPEN-COLLECTOR OUTPUTS R1 S1 7 V (tPZL, tPLZ, O.C.) Open (all others) From Output Under Test Test Point R2 CL (see Note A) RL = R1 = R2 1.5 V 1.5 V 1.5 V 3 V 3 V 0 V 0 V th tsu VOLTAGE WAVEFORMS SETUP AND HOLD TIMES Timing Input (see Note B) Data Input (see Note B) 1.5 V 1.5 V 3 V 3 V 0 V 0 V High-Level Pulse (see Note B) Low-Level Pulse tw VOLTAGE WAVEFORMS PULSE DURATION 1.5 V 1.5 V tPHL tPLH tPLH tPHL Input (see Note B) Out-of-Phase Output (see Note D) 1.5 V 1.5 V 1.5 V 1.5 V 1.5 V 1.5 V 3 V 0 V VOL VOH VOH VOL In-Phase Output (see Note D) VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES (see Note D) tPHZ tPLZ 0.3 V tPZL tPZH 1.5 V 1.5 V 1.5 V 1.5 V 3 V 0 V Output Control (low-level enable) Waveform 1 (see Notes C and D) Waveform 2 (see Notes C and D) 0 V VOH VOL 3.5 V 0.3 V VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS Figure 2. Load Circuit and Voltage Waveforms |
类似零件编号 - SN74BCT646DWRG4 |
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类似说明 - SN74BCT646DWRG4 |
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