PDIUSBH11 Datasheet, PDF (21/26 Pages) NXP Semiconductors – Universal Serial Bus Hub

Philips Semiconductors
Universal Serial Bus Hub
Product specification
PDIUSBH11
V_DD
UPSTREAM-
DIFFERENTIAL
DATA
V_SS
CROSSOVER
POINT
DOWNSTREAM-
DIFFERENTIAL
DATA
Hub Delay
Downstream
T_HDD
V_SS
A. DOWNSTREAM HUB DELAY
DOWNSTREAM
DIFFERENTIAL
DATA
CROSSOVER
POINT
CROSSOVER
POINT
UPSTREAM
DIFFERENTIAL
DATA
Hub Delay
Upstream
T_HDD
B. UPSTREAM HUB DELAY
SOP DISTORTION
T_SOP = T_HDD(SOP) – T_HDD (NEXT J)
LOW SPEED TIMINGS ARE DETERMINED IN THE SAME WAY FOR:
T_LHDD AND T_LSOP
Figure 2. Hub Differential Data Delay and SOP Distortion
CROSSOVER
POINT
SV00514
V_DD
UPSTREAM-
DIFFERENTIAL
DATA
V_SS
DOWNSTREAM-
DIFFERENTIAL
DATA
CROSSOVER
POINT
EXTENDED
T_EOP–
T_EOP+
CROSSOVER
POINT
EXTENDED
V_SS
A. DOWNSTREAM EOP DELAY
DOWNSTREAM
PORT
CROSSOVER
POINT
EXTENDED
UPSTREAM
END OF CABLE
T_EOP–
T_EOP+
CROSSOVER
POINT
EXTENDED
B. UPSTREAM EOP DELAY
EOP DELAY
T_EOPD = T_EOP–
EOP DELAY RELATIVE TO T_HDD
T_EOPDR = T_EOPD – T_HDD
EOP SKEW
T_HESK = T_EOP+ – T_EOP–
LOW SPEED TIMINGS ARE DETERMINED IN THE SAME WAY FOR:
T_LEOPD, T_LEOPDR, AND T_LHESK
Figure 3. Hub EOP Delay and EOP Skew
SV00515
1997 Aug 01
21