Philips ISP1122A Product Data page 37

Philips Semiconductors
+3.3 V
upstream
differential
data lines
0 V
+3.3 V
downstream
differential
data lines
0 V
(A) downstream EOP delay
EOP delay:
t EOP = max (t EOP− , t EOP+ )
EOP delay relative to t HDD :
t EOPD = t EOP − t HDD
EOP skew:
t HESK = t EOP+ − t EOP−
Full-speed timing symbols have a subscript prefix 'F', low-speed timings a prefix 'L'.
Fig 20. Hub EOP delay and EOP skew.
Table 34: Dynamic characteristics: I
V and T within recommended operating range; V
CC amb
Symbol Parameter
f SCL clock frequency
SCL
t bus free time
BUF
t START condition set-up time
SU;STA
t hold time START condition
HD;STA
t SCL LOW time
LOW
t SCL HIGH time
HIGH
t SCL and SDA rise time
r
t SCL and SDA fall time
f
t data set-up time
SU;DAT
t data hold time
HD;DAT
t SCL LOW to data out valid
VD;DAT
time
t STOP condition set-up time
SU;STO
C capacitive load for each bus
b
line
⁄
1
[1] f = f .
SCL 64 XTAL
[2] Rise time is determined by C
9397 750 08958
Product data
crossover
point
extended
t EOP− t EOP+
crossover
point
extended
2
C-bus pins (SDA, SCL)
DD
Conditions
f = 6 MHz
XTAL
and pull-up resistor value R
b p
Rev. 03 — 30 October 2001
downstream
port
upstream
end of cable
(B) upstream EOP delay
= +5 V; V
= V ; V and V
SS GND IL
Min
0
4.7
250
4.0
4.7
4.0
[2]
-
-
250
0
-
4.0
-
(typ. 4.7 kΩ).
ISP1122A
USB stand-alone hub
crossover
point
extended
t EOP− t EOP+
crossover
point
extended
MGR778
between V and V .
IH SS DD
Typ Max
[1]
93.75 100
- -
- -
- -
- -
- -
- 1000
- 300
- -
- -
- 0.4
- -
- 400
© Koninklijke Philips Electronics N.V. 2001. All rights reserved.
Unit
kHz
µs
ns
µs
µs
µs
ns
ns
ns
µs
µs
µs
pF
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