FST3257M datasheet(3/5 Pages) FAIRCHILD

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AC Electrical Characteristics

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)

Note 7: TA = +25°C, f = 1 MHz, Capacitance is characterized but not tested.

AC Loading and Waveforms

Note: Input driven by 50

Ω source terminated in 50 Ω

Note: CL includes load and stray capacitance

Note: Input PRR

= 1.0 MHz, t

W = 500 ns

FIGURE 1. AC Test Circuit

FIGURE 2. AC Waveforms

Symbol

Parameter

TA = −40 °C to +85°C,

Units

Conditions

Figure No.

CL = 50 pF, RU = RD = 500Ω

VCC = 4.5 – 5.5V

VCC = 4.0V

MinMax

tPHL,tPLH Prop Delay Bus to Bus (Note 6)

0.25

VI = OPEN

Figure 1

Figure 2

Prop Delay, Select to Bus A

1.0

4.7

5.2

tPZH, tPZL Output Enable Time, Select to Bus B

1.0

5.2

5.7

VI = 7V for tPZL

Figure 1

Figure 2

Output Enable Time, OE to Bus A, B

1.0

5.1

5.6

VI = OPEN for tPZH

tPHZ, tPLZ Output Disable Time, Select to Bus B

1.0

5.2

5.5

VI = 7V for tPLZ

Figure 1

Figure 2

Output Disable Time, Output Enable Time,

1.5

5.5

VI = OPEN for tPHZ

OE to Bus A, B

Symbol

Parameter

Typ

Max

Units

Conditions

CIN

Control Pin Input Capacitance

VCC = 5.0V

CI/O

A Port Input/Output Capacitance

VCC, OE = 5.0V

B Port

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