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FSTU3257M Datasheet(PDF) 4 Page - Fairchild Semiconductor

Part # FSTU3257M
Description  Quad 2:1 Multiplexer/Demultiplexer Bus Switch with -2V Undershoot Protection
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FSTU3257M Datasheet(HTML) 4 Page - Fairchild Semiconductor

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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 = +25°C, 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 °C to +85°C,
Units
Conditions
CL = 50pF, RU = RD = 500Ω
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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