AT43USB325E-AU Atmel, AT43USB325E-AU Datasheet - Page 102

• Manufacturer Part Number: AT43USB325E-AU
• Description: IC USB KEYBOARD CTRLR 64LQFP
• Manufacturer: Atmel
• Series: AVR®r

Specifications of AT43USB325E-AU

• 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: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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