Datasheet

TS3USB30
www.ti.com SCDS237E –AUGUST 2007–REVISED SEPTEMBER 2010
SWITCHING CHARACTERISTICS
over operating range, T
A
= –40°C to 85°C, V
CC
= 3.3 V ± 10%, GND = 0 V
PARAMETER TEST CONDITIONS MIN TYP
(1)
MAX UNIT
R
L
= 50 Ω, C
L
= 5 pF,
t
pd
Propagation delay
(2) (3)
0.25 ns
See Figure 12
R
L
= 50 Ω, C
L
= 5 pF,
t
ON
Line enable time, SEL to D, nD 30 ns
See Figure 8
R
L
= 50 Ω, C
L
= 5 pF,
t
OFF
Line disable time, SEL to D, nD 25 ns
See Figure 8
R
L
= 50 Ω, C
L
= 5 pF,
t
ON
Line enable time, OE to D, nD 30 ns
See Figure 8
R
L
= 50 Ω, C
L
= 5 pF,
t
OFF
Line disable time, OE to D, nD 25 ns
See Figure 8
R
L
= 50 Ω, C
L
= 5 pF,
t
SK(O)
Output skew between center port to any other port
(2)
50 ps
See Figure 13
Skew between opposite transitions of the same output R
L
= 50 Ω, C
L
= 5 pF,
t
SK(P)
20 ps
(t
PHL
– t
PLH
)
(2)
See Figure 13
R
L
= 50 Ω, C
L
= 5 pF,
t
J
Total jitter
(2)
t
R
= t
F
= 500 ps at 480 Mbps 20 ps
(PRBS = 2
15
– 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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