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FST3257M

Quad 2:1 Multiplexer/Demultiplexer Bus Switch

Fairchild Semiconductor 

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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