Philips ISP1122 and T, within recommended operating range; V, +5 V; V, =V, ; V, and V, between V, and V, .

Philips Semiconductors ISP1122
USB stand-alone hub
Product specification Rev. 03 — 29 March 2000 37 of 48
9397 750 07002 © Philips Electronics N.V. 2000. All rights reserved.
[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.
h
andbook, 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)
V
CC
and T
amb
within recommended operating range; V
DD
= +5 V; V
SS
=V
GND
; V
IL
and V
IH
between V
SS
and V
DD
.
Symbol Parameter Conditions Min Ty p Max Unit
fSCL SCL clock frequency fXTAL= 6 MHz 0 93.75[1] 100 kHz
tBUF bus free time 4.7 - - µs
tSU;STA START condition set-up time 250 - - ns
tHD;STA hold time START condition 4.0 - - µs
tLOW SCL LOW time 4.7 - - µs
tHIGH SCL HIGH time 4.0 - - µs
trSCL and SDA rise time [2] - - 1000 ns
tfSCL and SDA fall time - - 300 ns
tSU;DAT data set-up time 250 - - ns
tHD;DAT data hold time 0 - - µs
tVD;DAT SCL LOW to data out valid
time - - 0.4 µs
tSU;STO STOP condition set-up time 4.0 - - µs
Cbcapacitive load for each bus
line - - 400 pF