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FSTU3253M

Dual 4:1 Multiplexer/Demultiplexer Bus Switch with −2V Undershoot Protection

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)

Propagation Delay, Select to Bus A

0.5

0.25

5.7

0.25

6.2

ns VI = OPEN

Figures

2, 3

tPZH, tPZL Output Enable Time, Select to Bus B

0.5

5.7

Output Enable Time, IOE to Bus A, B

0.5

4.9

6.3

5.4

ns

VI = 7V for tPZL

VI = OPEN for tPZH

Figures

2, 3

tPHZ, tPLZ Output Disable Time, Select to Bus B

0.5

6.2

Output Disable Time, IOE to Bus A, B

0.5

6.0

6.3

6.1

ns

VI = 7V for tPLZ

VI = OPEN for tPHZ

Figures

2, 3

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

CI/O A Port Input/Output Capacitance

13

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

Undershoot Characteristic (Note 8)

Symbol

Parameter

Min

Typ

Max

Units

Conditions

VOUTU

Output Voltage During Undershoot

2.5

VOH - 0.3

V

Figure 1

Note 8: This test 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

Parameter

VIN

R1 = R2

VTRI

VCC

Value

see Waveform

100K

11.0

5.5

Units

V

Ω

V

V

Transient

Input Voltage (VIN) Waveform

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