PDIUSBH12N PHILIPS [NXP Semiconductors], PDIUSBH12N Datasheet - Page 22

• Manufacturer Part Number: PDIUSBH12N
• Description: USB 2-port hub
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
1999 Jul 22
DIFFERENTIAL
DOWNSTREAM-
DIFFERENTIAL
UPSTREAM-
USB 2-port hub
DATA
DATA
V
V
V
V
V
V
DD
SS
SS
DD
SS
SS
UPSTREAM-
DIFFERENTIAL
DOWNSTREAM-
DIFFERENTIAL
DATA
DATA
A. DOWNSTREAM EOP DELAY
SOP DISTORTION
t
LOW SPEED TIMINGS ARE DETERMINED IN THE SAME WAY FOR:
t
SOP
LHDD
A. DOWNSTREAM HUB DELAY
= t
AND t
HDD
(SOP) – t
LSOP
t
EOP–
CROSSOVER
HDD
POINT
Downstream
Hub Delay
(NEXT J)
t
EOP DELAY
t
EOP DELAY RELATIVE TO t
t
EOP SKEW
t
LOW SPEED TIMINGS ARE DETERMINED IN THE SAME WAY FOR:
t
EOPD
EOPDR
HESK
LEOPD
HDD
Figure 2. Hub Differential Data Delay and SOP distortion
= t
= t
, t
= t
EOP+
LEOPDR
EOP–
t
EOP+
EOPD
– t
Figure 3. Hub EOP Delay and EOP Skew
– t
, AND t
EOP–
CROSSOVER
EXTENDED
HDD
POINT
CROSSOVER
EXTENDED
LHESK
POINT
CROSSOVER
HDD
POINT
22
DOWNSTREAM
END OF CABLE
UPSTREAM
DOWNSTREAM
DIFFERENTIAL
UPSTREAM
DIFFERENTIAL
DATA
DATA
PORT
B. UPSTREAM EOP DELAY
B. UPSTREAM HUB DELAY
CROSSOVER
POINT
Hub Delay
t
Upstream
EOP–
t
HDD
PDIUSBH12
t
EOP+
Product specification
CROSSOVER
EXTENDED
CROSSOVER
POINT
CROSSOVER
EXTENDED
POINT
SV00514
POINT
SV00515