FST3244CW Просмотр технического описания (PDF) - Fairchild Semiconductor
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FST3244CW Datasheet PDF : 5 Pages
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AC Electrical Characteristics
Symbol
Parameter
TA = −40 °C to +85 °C,
CL = 50pF, 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)
0.25
0.25
ns VI = OPEN
Figure 1
Figure 2
tPZH, tPZL
Output Enable Time
1.0
5.6
6.1
ns VI = 7V for tPZL
Figure 1
VI = OPEN for tPZH Figure 2
tPHZ, tPLZ
Output Disable Time
1.0
6.2
5.6
ns VI = 7V for tPLZ
Figure 1
VI = OPEN for tPHZ Figure 2
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
Typ
CIN
Control Pin Input Capacitance
3
CI/O
Input/Output Capacitance
5
Note 7: TA = +25°C, f = 1 MHz, Capacitance is characterized but not tested.
Max
AC Loading and Waveforms
Units
pF
pF
Conditions
VCC = 5.0V
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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