ISP1122ABD datasheet(34/48 Pages) PHILIPS

34 / 48 page

Philips Semiconductors

ISP1122A

USB stand-alone hub

Preliminary speciﬁcation

Rev. 01 — 27 March 2000

34 of 48

9397 750 06986

[1]

Test circuit: see Figure 22.

[2]

Excluding the ﬁrst transition from Idle state.

[3]

Characterized only, not tested. Limits guaranteed by design.

Table 33: Dynamic characteristics: analog I/O pins (D

+, D−); low-speed mode [1]

VCC = 4.0 to 5.5 V; VGND =0V; Tamb = −40 to +85 °C; CL = 50 pF; RPU = 1.5 kΩ on D− to VTERM; unless otherwise speciﬁed.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Driver characteristics

tLR

rise time

CL = 200 to 600 pF;

10 to 90% of

|VOH − VOL|

300

tLF

fall time

CL = 200 to 600 pF;

10 to 90% of

|VOH − VOL|

300

LRFM

differential rise/fall time

matching (tLR/tLF)

[2] 80

125

VCRS

output signal crossover voltage

[2] [3] 1.3

2.0

Hub timing (downstream ports conﬁgured as low-speed)

tLHDD

hub differential data delay

see Figure 19

300

tLSOP

data bit width distortion after

SOP

see Figure 19

[3]

−60

+60

tLEOPD

hub EOP delay relative to tHDD see Figure 20

[3] 0

200

tLHESK

hub EOP output width skew

see Figure 20

[3]

−300

+300

Overcurrent input: OCn; power switch output: PSWn.

Reference voltage for overcurrent sensing: VCC (bus-powered mode) or VSP/BP (self-powered mode).

Fig 14. Overcurrent trip response timing.

handbook, halfpage

MBL032

VCC

0 V

overcurrent

input

VCC

0 V

power switch

output

ttrip

∆Vtrip

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