ISP1122ABD datasheet(38/48 Pages) PHILIPS

38 / 48 page

Philips Semiconductors

ISP1122A

USB stand-alone hub

Preliminary speciﬁcation

Rev. 01 — 27 March 2000

38 of 48

9397 750 06986

16. Test information

The dynamic characteristics of the analog I/O ports (D

+ and D−) as listed in Table 32

and Table 33, were determined using the circuit shown in Figure 22.

Fig 21. I2C-bus timing.

handbook, full pagewidth

MGR779

tHD;STA

tBUF

tHD;STA

tSU;STA

tSU;DAT

tHIGH

tSU;STO

tHD;STA

tLOW

SDA

SCL

Load capacitance:

CL = 50 pF (full-speed mode)

CL = 200 pF or 600 pF (low-speed mode, minimum or maximum timing).

Speed selection:

full-speed mode (FS): 1.5 k

Ω pull-up resistor on D+

low-speed mode (LS): 1.5 k

Ω pull-up resistor on D−.

Fig 22. Load impedance for D+ and D- pins.

MGR775

handbook, halfpage

test point

test

closed

open

−/LS

+/LS

−/FS

+/FS

Vreg(3.3)

15 k

Ω

RPU

1.5 k

Ω

D.U.T.

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