FST3257 View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
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FST3257 Datasheet PDF : 5 Pages
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AC Electrical Characteristics
TA = −40 °C to +85°C,
Symbol
Parameter
CL = 50 pF, RU = RD = 500Ω
VCC = 4.5 – 5.5V
VCC = 4.0V
Units
Conditions
Figure No.
Min
Max
Min
Max
tPHL,tPLH Prop Delay Bus to Bus (Note 6)
Prop Delay, Select to Bus A
0.25
1.0
4.7
0.25
5.2
ns VI = OPEN
Figure 1
Figure 2
tPZH, tPZL Output Enable Time, Select to Bus B
Output Enable Time, OE to Bus A, B
1.0
5.2
1.0
5.1
5.7
5.6
VI = 7V for tPZL
ns
VI = OPEN for tPZH
Figure 1
Figure 2
tPHZ, tPLZ Output Disable Time, Select to Bus B
1.0
5.2
Output Disable Time, Output Enable Time, 1.5
5.5
5.5
5.5
ns
VI = 7V for tPLZ
VI = OPEN for tPHZ
Figure 1
Figure 2
OE to Bus A, B
Note 6: 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 7)
Symbol
Parameter
CIN
Control Pin Input Capacitance
CI/O
A Port Input/Output Capacitance
B Port
Note 7: TA = +25°C, f = 1 MHz, Capacitance is characterized but not tested.
AC Loading and Waveforms
Typ
Max
Units
Conditions
3
pF VCC = 5.0V
7
pF
5
pF
VCC, OE = 5.0V
Note: Input driven by 50 Ω source terminated in 50 Ω
Note: CL includes load and stray capacitance
Note: Input PRR = 1.0 MHz, tW = 500 ns
FIGURE 1. AC Test Circuit
FIGURE 2. AC Waveforms
3
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