© 1997 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FST3257 • Rev. 1.0.3

5

AC Electrical Characteristics

RU=RD=500

Ω

to 5.5V

to 3.6V

(7)

Units

Figure

Symbol

Parameter

Conditions

Min.

Max.

Min.

Max.

Min.

Max.

Propagation Delay

Bus to Bus

(6)

0.25

Propagation Delay

Select to Bus A

(6)

0.25

0.25

1.0

6.8

ns

Figure 3

Figure 4

Output Enable

Time, Select to

Bus B

1.0

7.9

Output Enable

Time, Select to

Bus /OE

1.0

5.0

5.5

1.0

8.5

ns

Figure 3

Figure 4

Output Disable

Time, Select to

Bus B

1.0

9.9

Output Disable

Time, Select to

Bus /OE

1.5

5.3

5.6

1.5

9.9

ns

Figure 3

Figure 4

Notes:

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 source (zero output impedance).

7.

These parameters are guaranteed by design, but not tested.

Capacitance

Symbol

Parameter

Conditions

Typ.

Max.

Units

Control Pin Input Capacitance

3.0

pF

A Port

7.0

B Port

5.0

pF

A Port

3.0

Input/Output Capacitance

B Port

3.5

pF