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SN54ACT8990 Datasheet(PDF) 11 Page - Texas Instruments |
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SN54ACT8990 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 15 page SN54ACT8990, SN74ACT8990 TEST-BUS CONTROLLERS IEEE STD 1149.1 (JTAG) TAP MASTERS WITH 16-BIT GENERIC HOST INTERFACES SCAS190E – JUNE 1990 – REVISED JANUARY 1997 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION th tsu From Output Under Test CL = 50 pF LOAD CIRCUIT S1 VCC Open GND 1 k Ω tPLH/tPHL tPLZ/tPZL tPHZ/tPZH Open VCC GND Output Control (high-level enabling) Output Waveform 1 S1 at VCC (see Note B) Output Waveform 2 S1 at GND (see Note B) VOL VOH tPZL tPZH tPLZ tPHZ 1.5 V 1.5 V ≈ VCC 0 V 50% VCC ≈ 0 V 3 V Data Input Timing Input 1.5 V 3 V 0 V 1.5 V 1.5 V 3 V 0 V 3 V 0 V 1.5 V 1.5 V tw Input (see Note A) 50% VCC 10% VCC 90% VCC tPLH tPHL 1.5 V 1.5 V 3 V 0 V 50% VCC 50% VCC VOH VOL Input Output VOLTAGE WAVEFORMS PULSE DURATION VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES VOLTAGE WAVEFORMS SETUP AND HOLD TIMES TEST S1 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 are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr ≤ 3 ns, tf ≤ 3 ns. For testing pulse duration: tr = tf = 1 to 3 ns. Pulse polarity can be either high-to-low-to-high or low-to-high-to-low. D. The outputs are measured one at a time with one transition per measurement. Figure 1. Load Circuit and Voltage Waveforms |
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