Dynamic characteristics, Isp1122, Philips semiconductors – Philips Universal Serial Bus ISP1122 User Manual
Page 32
Philips Semiconductors
ISP1122
USB stand-alone hub
Product specification
Rev. 03 — 29 March 2000
32 of 48
9397 750 07002
© Philips Electronics N.V. 2000. All rights reserved.
[1]
D
+
is the USB positive data pin (DPn); D
−
is the USB negative data pin (DMn).
[2]
Includes external resistors of 20
Ω ±
1% on both D
+
and D
−
.
[3]
This voltage is available at pin V
reg(3.3)
.
[4]
In ‘suspend’ mode the minimum voltage is 2.7 V.
15. Dynamic characteristics
[1]
Dependent on the crystal oscillator start-up time.
Table 29: Static characteristics: analog I/O pins (D
+
, D
−
)
V
CC
= 4.0 to 5.5 V; V
GND
= 0 V; T
amb
=
−
40 to
+
85
°
C; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Input levels
V
DI
differential input sensitivity
|
V
I(D
+
)
−
V
I(D
−
)
|
0.2
-
-
V
V
CM
differential common mode
voltage
includes V
DI
range
0.8
-
2.5
V
V
IL
LOW-level input voltage
-
-
0.8
V
V
IH
HIGH-level input voltage
2.0
-
-
V
Output levels
V
OL
LOW-level output voltage
R
L
= 1.5 k
Ω
to
+
3.6V
-
-
0.3
V
V
OH
HIGH-level output voltage
R
L
= 15 k
Ω
to GND
2.8
-
3.6
V
Leakage current
I
LZ
OFF-state leakage current
-
-
±
10
µ
A
Capacitance
C
IN
transceiver capacitance
pin to GND
-
-
20
pF
Resistance
Z
DRV
driver output impedance
steady-state drive
28
-
44
Ω
Z
INP
input impedance
10
-
-
M
Ω
Termination
V
termination voltage for
upstream port pull-up (R
PU
)
3.0
-
3.6
V
Table 30: Dynamic characteristics
V
CC
= 4.0 to 5.5 V; V
GND
= 0 V; T
amb
=
−
40 to
+
85
°
C; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Reset
t
W(RESET)
pulse width on input RESET
crystal oscillator running
10
-
-
µ
s
crystal oscillator stopped
-
-
ms
Crystal oscillator
f
XTAL
crystal frequency
-
6
-
MHz