ISP1122ABD datasheet(37/48 Pages) PHILIPS

37 / 48 page

Philips Semiconductors

ISP1122A

USB stand-alone hub

Preliminary speciﬁcation

Rev. 01 — 27 March 2000

37 of 48

9397 750 06986

[1]

fSCL = 1⁄64fXTAL.

[2]

Rise time is determined by Cb and pull-up resistor value Rp (typ. 4.7 kΩ).

Full-speed timing symbols have a subscript preﬁx ‘F’, low-speed timings a preﬁx ‘L’.

Fig 20. Hub EOP delay and EOP skew.

handbook, full pagewidth

MGR778

tEOP+

tEOP−

tEOP+

tEOP−

crossover

point

extended

crossover

point

extended

EOP delay:

tEOP = max (tEOP−, tEOP+)

EOP delay relative to tHDD:

tEOPD = tEOP − tHDD

EOP skew:

tHESK = tEOP+ − tEOP−

(A) downstream EOP delay

(B) upstream EOP delay

upstream

differential

data lines

downstream

port

crossover

point

extended

crossover

point

extended

upstream

end of cable

downstream

differential

data lines

+3.3 V

0 V

+3.3 V

0 V

Table 34: Dynamic characteristics: I2C-bus pins (SDA, SCL)

VCC and Tamb within recommended operating range; VDD = +5 V; VSS =VGND ; VIL and VIH between VSS and VDD.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fSCL

SCL clock frequency

fXTAL = 6 MHz

93.75 [1]

100

kHz

tBUF

bus free time

4.7

µs

tSU;STA

START condition set-up time

250

tHD;STA

hold time START condition

4.0

µs

tLOW

SCL LOW time

4.7

µs

tHIGH

SCL HIGH time

4.0

µs

SCL and SDA rise time

[2] -

1000

SCL and SDA fall time

300

tSU;DAT

data set-up time

250

tHD;DAT

data hold time

µs

tVD;DAT

SCL LOW to data out valid

time

0.4

µs

tSU;STO

STOP condition set-up time

4.0

µs

capacitive load for each bus

line

400

ISP1122ABD Datasheet(PDF) 37 Page - NXP Semiconductors

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