Philips Semiconductors Product specification
PDIUSBH12USB 2-port hub
1999 Jul 22 21
AC CHARACTERISTICS (AI/O pins, LOW speed)SYMBOL PARAMETER TEST CONDITIONS MIN MAX UNIT
Driver characteristics CL = 50pF and 350pF;
Rpu = 1.5kΩ on D– to VCC
Transition Time Between 10% and 90%
t
Rise time
CL = 50pF 75 ns
t
lr
Rise
time
CL = 350pF 300 ns
tf
Fall time
CL = 50pF 75 ns
t
lf
Fall
time
CL = 350pF 300 ns
tRFM Rise/fall time matching (tr/tf) 80 120 %
VLCRS Output signal crossover voltage 1.3 2.0 V
Driver Timings
tLEOPT Source EOP width Figure 1 1.25 1.50 µs
tLDEOP Differential data to EOP transition skew Figure 1 –40 100 ns
Receiver Timings
EOP Width at Receiver
tLEOPR1 Must reject as EOP
Figure 1
330 ns
tLEOPR2 Must accept
Fig
u
re
1
675 ns
Hub Timings Low Speed downstream port.
tLHDD Hub Differential Data Delay Figure 2 300 ns
tLSOP Data bit width distortion after SOP Figure 2 –65 45 ns
tLEOPDR Hub EOP Delay Relative to THDD Figure 3 0 200 ns
tLHESK Hub EOP Output Width Skew Figure 3 –300 +300 ns
SV00837
tPERIOD
DIFFERENTIAL
DATA LINES
CROSSOVER POINT
CROSSOVER POINT
EXTENDED
DIFFERENTIAL DATA TO
SEO/EOP SKEW
N * tPERIOD + tDEOP
SOURCE EOP WIDTH: tEOPT
RECEIVER EOP WIDTH: tEOPR1, tEOPR2
Figure 1. Differential data to EOP transition skew and EOP width