AT43USB320A_04 ATMEL [ATMEL Corporation], AT43USB320A_04 Datasheet - Page 102

• Manufacturer Part Number: AT43USB320A_04
• Description: Full-speed USB Microcontroller with an Embedded Hub
• Manufacturer: ATMEL [ATMEL Corporation]

AC Characteristics
102
AT43USB320A
Table 33. Oscillator Signals: XTAL1, XTAL2
Note:
Table 34. USB Driver Characteristics, Full Speed Operation
Note:
Figure 23. Full-speed Load
Table 35. USB Driver Characteristics, Low-speed Operation
Symbol
V
V
CX1
CX2
C12
t
DL
Symbol
TR
TF
TRFM
ZDRV
Symbol
TR
TF
TRFM
SU
LH
HL
XTAL2 must not be used to drive other circuitry.
1. With external 27Ω series resistor.
Parameter
Rise time
Fall time
TR/TF matching
Driver output resistance
Parameter
OSC1 switching level
OSC1 switching level
Input capacitance, XTAL1
Output capacitance, XTAL2
OSC1/2 capacitance
Start-up time
Drive level
Parameter
Rise time
Fall time
TR/TF matching
TxD-
TxD+
C
(1)
L
= 50 pF
Condition
CL = 200 - 600 pF
CL = 200 - 600 pF
Condition
6 MHz, fundamental
Condition
C
C
Steady state drive
L
L
= 50 pF
= 50 pF
R
R
S
S
C
C
L
L
Min
0.47
0.67
Min
Min
75
75
80
90
28
4
4
Max
Max
Max
1.20
1.44
110
300
300
125
150
20
20
44
16
16
8
2
1443E–USB–4/04
Unit
Unit
Unit
µW
ms
ns
ns
pF
pF
pF
ns
ns
%
Ω
%
V
V