Philips integrated circuits pdiusbh12 User Manual
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