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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−)
[1]
V
CC
= 4.0 to 5.5 V; V
GND
=0V; 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 kΩ to +3.6V - - 0.3 V
V
OH
HIGH-level output voltage R
L
=15kΩ to GND 2.8 - 3.6 V
Leakage current
I
LZ
OFF-state leakage current - - ±10 µA
Capacitance
C
IN
transceiver capacitance pin to GND - - 20 pF
Resistance
Z
DRV
[2]
driver output impedance steady-state drive 28 - 44 Ω
Z
INP
input impedance 10 - - MΩ
Termination
V
TERM
[3]
termination voltage for
upstream port pull-up (R
PU
)
3.0
[4]
- 3.6 V
Table 30: Dynamic characteristics
V
CC
= 4.0 to 5.5 V; V
GND
=0V; 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 - - µs
crystal oscillator stopped - 2
[1]
-ms
Crystal oscillator
f
XTAL
crystal frequency - 6 - MHz