AT43USB325E-AC Atmel, AT43USB325E-AC Datasheet - Page 102
AT43USB325E-AC
Manufacturer Part Number
AT43USB325E-AC
Description
IC USB KEYBOARD CTRLR HUB 64LQFP
Manufacturer
Atmel
Series
AVR®r
Datasheet
1.AT43USB325E-AC.pdf
(109 pages)
Specifications of AT43USB325E-AC
Applications
Keyboard Controller
Core Processor
AVR
Program Memory Type
SRAM (16 kB)
Controller Series
AT43USB
Ram Size
512 x 8
Interface
SPI, 3-Wire Serial
Number Of I /o
42
Voltage - Supply
4.4 V ~ 5.25 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
64-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Figure 9-7.
Figure 9-8.
102
AT43USB325
Hub Differential Delay, Differential Jitter and SOP Distortion
Hub EOP Delay and EOP Skew
Downstream
Upstream
End of
Cable
Port
V
V
Differential
Data Lines
Upstream
SS
SS
End of
A. Upstream EOP Delay with Cable
Cable
V
V
A. Downstream Hub Delay With Cable
SS
SS
50% Point of
Initial Swing
T
EOP-
Downstream
Port or End of
Hub Delay
50% Point of
Downstream
Initial Swing
T
HDD1
Port or End of
Upstream
Downstream
C. Upstream Hub Delay with or without Cable
T
EOP+
Cable
Upstream
Port
V
V
C. Upstream EOP Delay with or without Cable
SS
SS
Cable
Port
V
V
Crossover
SS
SS
Point
Crossover
T
HDD1,
Hub Delay
Upstream
Point
B. Upstream Hub Delay Without Cable
T
Downstream
Downstream
T
EOP
HDD2
Upstream
Upstream
B. Downstream EOP Delay without Cable
Port
Port
Port
Port
V
V
V
V
T
SS
SS
SS
Crossover
SS
EOP+
Point
Crossover
Extended
Point
Crossover
Crossover
Hub Delay
Extended
Upstream
Point
T
Point
HDD2
T
EOP-
Crossover
Point
T
EOP+
Crossover
Extended
Point
Crossover
Extended
Point
3355C–USB–4/05
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