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FST32253

Dual 4:1 Multiplexer/Demultiplexer Bus Switch with 25Ω Series Resistor in Outputs

Fairchild Semiconductor 

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

Number

Min

Max

Min

Max

tPHL, tPLH

Propagation Delay Bus to Bus

(Note 6)

1.25

Propagation Delay, Select to Bus A

0.5

6.7

1.25

ns VI = OPEN

7.3

Figures

1, 2

tPZH, tPZL

Output Enable Time, Select to Bus B

0.5

6.8

Output Enable Time, IOE to Bus A, B

0.5

6.0

7.3

6.4

ns

VI = 7V for tPZL

VI = OPEN for tPZH

Figures

1, 2

tPHZ, tPLZ

Output Disable Time., Select to Bus B 0.5

5.7

Output Disable Time, IOE to Bus A, B

0.5

5.7

6.4

6.5

ns

VI = 7V for tPLZ

VI = OPEN for tPHZ

Figures

1, 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

A Port

13

CI/O

Input/Output Capacitance

B Port

5

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

Max

Units

pF

pF

pF

Conditions

VCC = 5.0V

VCC, OE = 5.0V

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, tW = 500 ns

FIGURE 1. AC Test Circuit

FIGURE 2. AC Waveforms

3

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