Philips Semiconductors ISP1122
USB stand-alone hub
Product specification Rev. 03 — 29 March 2000 34 of 48
9397 750 07002 © Philips Electronics N.V. 2000. All rights reserved.
[1] Test circuit: seeFigure 22.
[2] Excluding the first transition from Idle state.
[3] Characterized only, not tested. Limits guaranteed by design.
Table 33: Dynamic characteristics: analog I/O pins (D+, D−); low-speed mode[1]
V
CC
= 4.0 to 5.5 V; V
GND
=0V;T
amb
=
−
40 to
+
85
°
C; C
L
= 50 pF; R
PU
= 1.5 k
Ω
on D
−
to V
TERM
; unless otherwise specified.
Symbol Parameter Conditions Min Ty p Max Unit
Driver characteristics
tLR rise time CL= 200 to 600 pF;
10 to 90% of |VOH −VOL|75 - 300 ns
tLF fall time CL= 200 to 600 pF;
10 to 90% of |VOH −VOL|75 - 300 ns
LRFM differential rise/fall time
matching (tLR/tLF)
[2] 80 - 125 %
VCRS output signal crossover voltage [2][3] 1.3 - 2.0 V
Hub timing (downstream ports configured as low-speed)
tLHDD hub differential data delay see Figure 19 - - 300 ns
tLSOP data bit width distortion after
SOP see Figure 19 [3] −60 - +60 ns
tLEOPD hub EOP delay relative to tHDD see Figure 20 [3] 0 - 200 ns
tLHESK hub EOP output width skew see Figure 20 [3] −300 - +300 ns
Overcurrent input: OCn; power switch output:PSWn.
Reference voltage for overcurrent sensing: VCC (bus-powered mode) or VSP/BP (self-powered mode).
Fig 14. Overcurrent trip response timing.
handbook, halfpage
MBL032
VCC
0 V
overcurrent
input
VCC
0 V
power switch
output
ttrip
∆Vtrip