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SN74AHC157PW Scheda tecnica(PDF) 6 Page - Texas Instruments |
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SN74AHC157PW Scheda tecnica(HTML) 6 Page - Texas Instruments |
6 / 19 page SN54AHC157, SN74AHC157 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS SCLS345I – MAY 1996 – REVISED JULY 2003 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION 50% VCC VCC VCC 0 V 0 V th tsu VOLTAGE WAVEFORMS SETUP AND HOLD TIMES Data Input tPLH tPHL tPHL tPLH VOH VOH VOL VOL VCC 0 V 50% VCC 50% VCC Input Out-of-Phase Output In-Phase Output Timing Input 50% VCC VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES INVERTING AND NONINVERTING OUTPUTS Output Control Output Waveform 1 S1 at VCC (see Note B) Output Waveform 2 S1 at GND (see Note B) VOL VOH tPZL tPZH tPLZ tPHZ ≈VCC 0 V 50% VCC VOL + 0.3 V 50% VCC ≈0 V VCC VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES LOW- AND HIGH-LEVEL ENABLING tPLH/tPHL tPLZ/tPZL tPHZ/tPZH Open Drain Open VCC GND VCC TEST S1 VCC 0 V 50% VCC tw VOLTAGE WAVEFORMS PULSE DURATION Input 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 ≤ 1 MHz, ZO = 50 Ω, tr ≤ 3 ns, tf ≤ 3 ns. D. The outputs are measured one at a time with one input transition per measurement. E. All parameters and waveforms are not applicable to all devices. From Output Under Test CL (see Note A) LOAD CIRCUIT FOR 3-STATE AND OPEN-DRAIN OUTPUTS S1 VCC RL = 1 kΩ GND From Output Under Test CL (see Note A) Test Point LOAD CIRCUIT FOR TOTEM-POLE OUTPUTS Open 50% VCC 50% VCC 50% VCC 50% VCC 50% VCC 50% VCC 50% VCC 50% VCC VOH – 0.3 V Figure 1. Load Circuit and Voltage Waveforms |
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