TS3USB30 datasheet(5/19 Pages) TI

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SWITCHING CHARACTERISTICS

TS3USB30

www.ti.com......................................................................................................................................................... SCDS237D – AUGUST 2007 – REVISED MAY 2008

over operating range, TA = –40°C to 85°C, VCC = 3.3 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 12

RL = 50 Ω, CL = 5 pF,

tON

Line enable time, SEL to D, nD

See Figure 8

RL = 50 Ω, CL = 5 pF,

tOFF

Line disable time, SEL to D, nD

See Figure 8

RL = 50 Ω, CL = 5 pF,

tON

Line enable time, OE to D, nD

See Figure 8

RL = 50 Ω, CL = 5 pF,

tOFF

Line disable time, OE to D, nD

See Figure 8

RL = 50 Ω, CL = 5 pF,

tSK(O)

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

See Figure 13

Skew between opposite transitions of the same output

RL = 50 Ω, CL = 5 pF,

tSK(P)

(tPHL – tPLH)

(2)

See Figure 13

RL = 50 Ω, CL = 5 pF,

Total jitter(2)

tR = tF = 500 ps at 480 Mbps

(PRBS = 215 – 1)

(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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