Philips Integrated Circuits PDIUSBH12 - Manual (Page 20)

Philips Semiconductors Product specification
PDIUSBH12 USB 2-port hub
1999 Jul 22 20
AC CHARACTERISTICS (AI/O pins, FULL speed)
SYMBOL PARAMETER TEST CONDITIONS MIN MAX UNIT
Driver characteristics C
L
= 50pF;
R
pu
= 1.5k Ω on D+ to V
CC
Transition Time:
t
r
Rise time
Between 10% and 90%
4 20 ns
t
f
Fall time
Between 10% and 90%
4 20 ns
t
RFM
Rise/fall time matching (t
r
/t
f
) 90 110 %
V
CRS
Output signal crossover voltage 1.3 2.0 V
Driver Timings
t
EOPT
Source EOP width Figure 1 160 175 ns
t
DEOP
Differential data to EOP transition skew Figure 1 –2 5 ns
Receiver Timings
Receiver Data Jitter Tolerance
t
JR1
To next transition Characterized and not tested. –18.5 18.5 ns
t
JR2
For paired transitions Guaranteed by design. –9 9 ns
EOP Width at Receiver
t
EOPR1
Must reject as EOP Figure 1 40 ns
t
EOPR2
Must accept 82 ns
Hub Timings Full Speed downstream port.
t
HDD
Hub Differential Data Delay Figure 2 40 ns
t
SOP
Data bit width distortion after SOP Figure 2 –5 3 ns
t
EOPDR
Hub EOP Delay Relative to t
HDD
Figure 3 0 15 ns
t
HESK
Hub EOP Output Width Skew Figure 3 –15 +15 ns