AT43USB325E-AC Atmel, AT43USB325E-AC Datasheet - Page 99
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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Table 9-9.
Note:
3355C–USB–4/05
Symbol
TDRATE
TFRAME
TRFI
TRFIADJ
TDJ1
TDJ2
TFDEOP
TDEOP
TJR1
TJR2
TFEOPT
TFEOPR
TFST
1. With 6.000 MHz, 100 ppm crystal.
Parameter
Full Speed Data Rate
Frame Interval
Consecutive Frame Interval Jitter
Consecutive Frame Interval Jitter
Source Diff Driver Jitter
To Next Transition
For Paired Transitions
Source Jitter for Differential Transition to
SEO Transitions
Differential to EOP Transition Skew
Receiver Data Jitter Tolerance
To Next Transition
For Paired Transitions
Source SEO interval of EOP
Receiver SEO interval of EOP
Width of SEO interval during differential
transition
USB Source Timings, Full-speed Operation
Figure 9-3.
(1)
(1)
Low-speed Downstream Port Load
(1)
(1)
TxD+
TxD-
C
L
Condition
Average Bit Rate
No clock adjustment
With clock adjustment
= 200 pF to 600 pF
R
R
S
S
C
C
L
L
0.9995
11.97
-18.5
Min
-3.5
160
82
-4
-2
-2
-9
3.6V
1.5 K Ohm
AT43USB325
1.0005
12.03
Max
18.5
126
175
3.5
42
14
4
5
5
9
Mb/s
Unit
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
99
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