AT43USB325E-AU Atmel, AT43USB325E-AU Datasheet - Page 99

• 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

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