TS3USB31E datasheet(4/18 Pages) TI

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TS3USB31E

SCDS256 – OCTOBER 2009

www.ti.com

DYNAMIC ELECTRICAL CHARACTERISTICS

over operating range, TA = –40°C to 85°C, VCC = 2.5 V ± 10%, GND = 0 V

PARAMETER

TEST CONDITIONS

TYP (1)

UNIT

XTALK

Crosstalk

RL = 50 Ω, f = 240 MHz, See Figure 9

-53

OISO

OFF isolation

RL = 50 Ω, f = 240 MHz, See Figure 8

-30

Bandwidth (–3 dB)

RL = 50 Ω, CL = 5 pF, See Figure 10

1100

MHz

(1)

For Max or Min conditions, use the appropriate value specified under Electrical Characteristics for the applicable device type.

DYNAMIC ELECTRICAL CHARACTERISTICS

over operating range, TA = –40°C to 85°C, VCC = 3.3 V ± 10%, GND = 0 V

PARAMETER

TEST CONDITIONS

TYP (1)

UNIT

XTALK

Crosstalk

RL = 50 Ω, f = 240 MHz, See Figure 9

–53

OIRR

OFF isolation

RL = 50 Ω, f = 240 MHz, See Figure 8

–30

Bandwidth (–3 dB)

RL = 50 Ω, CL = 5 pF, See Figure 10

1100

MHz

(1)

For Max or Min conditions, use the appropriate value specified under Electrical Characteristics for the applicable device type.

SWITCHING CHARACTERISTICS

over operating range, TA = –40°C to 85°C, VCC = 2.5 V ± 10%, GND = 0 V

PARAMETER

TEST CONDITIONS

MIN

TYP (1)

MAX

UNIT

RL = 50 Ω, CL = 5 pF,

tpd

Propagation delay(2) (3)

0.25

See Figure 11

RL = 50 Ω, CL = 5 pF,

tON

Line enable time, OE to D, nD

See Figure 7

RL = 50 Ω, CL = 5 pF,

tOFF

Line disable time, OE to D, nD

See Figure 7

RL = 50 Ω, CL = 5 pF,

tSK(O)

Output skew between center port to any other port(2)

See Figure 12

Skew between opposite transitions of the same output

RL = 50 Ω, CL = 5 pF,

tSK(P)

(tPHL – tPLH)

(2)

See Figure 12

RL = 50 Ω, CL = 5 pF,

Total jitter(2)

200

tR = tF = 500 ps at 480 Mbps

(1)

For Max or Min conditions, use the appropriate value specified under Electrical Characteristics for the applicable device type.

(2)

Specified by design

(3)

The bus switch contributes no propagational delay other than the RC delay of the on resistance of the switch and the load capacitance.

The time constant for the switch alone is of the order of 0.25 ns for 10-pF load. Since this time constant is much smaller than the rise/fall

times of typical driving signals, it adds very little propagational delay to the system. Propagational delay of the bus switch, when used in

a system, is determined by the driving circuit on the driving side of the switch and its interactions with the load on the driven side.

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