AT43USB325E-AC Atmel, AT43USB325E-AC Datasheet - Page 100

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

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

100
AT43USB325
Figure 9-4.
Figure 9-5.
Figure 9-6.
Differential Data Jitter
Differential-to-EOP Transition Skew and EOP Width
Receiver Jitter Tolerance
Data Lines
Differential
T
PERIOD
Differential
Data Lines
T
Differential
Data Lines
PERIOD
T
PERIOD
N*T
Diff. Data-to-
PERIOD
SE0 Skew
N*T
+ T
Consecutive
Crossover
N*T
Transitions
PERIOD
DEOP
Points
Consecutive
Transitions
N*T
PERIOD
T
JR
Transitions
PERIOD
+ T
Crossover
Extended
Paired
N*T
+ T
XJR1
Point
Consecutive
Transitions
PERIOD
JR1
+ T
XJR2
+ T
T
JR1
Source EOP Width:
Receiver EOP Width:
JR1
T
JR2
T FEOPT
T
LEOPT
T
T FEOPR
LEOPR
3355C–USB–4/05