AT43USB325E-AC Atmel, AT43USB325E-AC Datasheet - Page 98

• 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

98
AT43USB325
Figure 9-1.
Table 9-7.
Note:
Figure 9-2.
Table 9-8.
Symbol
TR
TF
TRFM
ZDRV
Symbol
TR
TF
TRFM
1. With external 27 series resistor.
MOSI
MISO
SSN
SCK
Parameter
Rise time
Fall time
TR/TF matching
Driver output resistance
V
V
Parameter
Rise time
Fall time
TR/TF matching
V
V
V
V
V
V
OH
OL
IH
IH
IH
IL
IL
IL
Synchronous Data Timing
USB Driver Characteristics, Full Speed Operation
Full-speed Load
USB Driver Characteristics, Low-speed Operation
t
CSS
HI-Z
t
SU
TxD-
TxD+
VALID IN
(1)
C
L
= 50 pF
Condition
CL = 200 - 600 pF
CL = 200 - 600 pF
t
WH
Condition
C
C
Steady state drive
t
H
L
L
= 50 pF
= 50 pF
R
R
S
S
t
WL
t
V
C
C
L
L
Min
Min
75
75
80
90
28
4
4
t
H0
t
CSH
Max
Max
110
300
300
125
20
20
44
t
t
DIS
CS
HI-Z
3355C–USB–4/05
Unit
Unit
ns
ns
%
ns
ns
%