isp1122 NXP Semiconductors, isp1122 Datasheet - Page 37

• Manufacturer Part Number: isp1122
• Description: Isp1122 Universal Serial Bus Stand-alone Hub
• Manufacturer: NXP Semiconductors

Table 34: Dynamic characteristics: I
V
[1]
[2]
Philips Semiconductors
9397 750 07002
Product specification
Symbol
f
t
t
t
t
t
t
t
t
t
t
t
C
SCL
BUF
SU;STA
HD;STA
LOW
HIGH
r
f
SU;DAT
HD;DAT
VD;DAT
SU;STO
Fig 20. Hub EOP delay and EOP skew.
CC
b
handbook, full pagewidth
and T
f
Rise time is determined by C
SCL
Full-speed timing symbols have a subscript prefix ‘F’, low-speed timings a prefix ‘L’.
3.3 V
3.3 V
=
downstream
differential
differential
data lines
data lines
upstream
0 V
0 V
amb
1
EOP delay:
EOP delay relative to t HDD :
EOP skew:
64
t EOP = max (t EOP , t EOP )
t EOPD = t EOP
t HESK = t EOP
f
XTAL
within recommended operating range; V
Parameter
SCL clock frequency
bus free time
START condition set-up time
hold time START condition
SCL LOW time
SCL HIGH time
SCL and SDA rise time
SCL and SDA fall time
data set-up time
data hold time
SCL LOW to data out valid
time
STOP condition set-up time
capacitive load for each bus
line
.
(A) downstream EOP delay
t HDD
t EOP
b
t EOP
and pull-up resistor value R
2
C-bus pins (SDA, SCL)
t EOP
Conditions
f
crossover
extended
XTAL
point
Rev. 03 — 29 March 2000
crossover
extended
point
= 6 MHz
DD
p
(typ. 4.7 k ).
+5 V; V
downstream
end of cable
upstream
SS
port
= V
GND
[2]
(B) upstream EOP delay
; V
Min
0
4.7
250
4.0
4.7
4.0
-
-
250
0
-
4.0
-
IL
and V
t EOP
IH
between V
Typ
93.75
-
-
-
-
-
-
-
-
-
-
-
-
[1]
t EOP
USB stand-alone hub
SS
© Philips Electronics N.V. 2000. All rights reserved.
crossover
extended
Max
100
-
-
-
-
-
1000
300
-
-
0.4
-
400
and V
point
ISP1122
MGR778
crossover
extended
DD
point
.
Unit
kHz
ns
ns
ns
ns
pF
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