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FSTU3257 Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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FSTU3257 Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 6 page 3 www.fairchildsemi.com AC Electrical Characteristics Note 7: This parameter is guaranteed by design but is not tested. The bus switch contributes no propagation delay other than the RC delay of the typical On resistance of the switch and the 50pF load capacitance, when driven by an ideal voltage the source (zero output impedance). Capacitance (Note 8) Note 8: TA 25qC, f 1 MHz, Capacitance is characterized but not tested. Undershoot Characteristic (Note 9) Note 9: This is intended to characterize the device’s protective capabilities by maintaining output signal integrity during an input transient voltage undershoot event. FIGURE 1. Device Test Conditions Transient Input Voltage (VIN) Waveform Symbol Parameter TA 40 qC to 85qC, Units Conditions CL 50pF, RU RD 500: Figure VCC 4.5 – 5.5V VCC 4.0V No. Min Max Min Max tPHL,tPLH Prop Delay Bus to Bus (Note 7) 0.25 0.25 ns VI OPEN Figures 2, 3 Prop Delay, Select to Bus A 7.0 30.0 35.0 tPZH, tPZL Output Enable Time, Select to Bus B 7.0 30.0 35.0 ns VI 7V for tPZL Figures 2, 3 Output Enable Time, OE to Bus A, B 7.0 30.0 35.0 VI OPEN for tPZH tPHZ, tPLZ Output Disable Time, Select to Bus B 1.5 8.4 9.8 ns VI 7V for tPLZ Figures 2, 3 Output Disable Time, Output Enable Time, OE to Bus A, B 1.5 8.8 9.8 VI OPEN for tPHZ Symbol Parameter Typ Max Units Conditions CIN Control Pin Input Capacitance 3 pF VCC 5.0V CI/O A Port Input/Output Capacitance 7.5 pF VCC, OE 5.0V B Port 5.5 pF CI/O ON State Input/Output Capacitance ON State (A or B Port) 14 pF VCC 5.0V Switch ON Symbol Parameter Min Typ Max Units Conditions VOUTU Output Voltage During Undershoot 2.5 VOH 0.3 V Figure 1 Parameter Value Units VIN See Waveform V R1 - R2 100K : VTRI 11.0 V VCC 5.5 V |
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