AT90USB647-MU Atmel, AT90USB647-MU Datasheet - Page 402

• Manufacturer Part Number: AT90USB647-MU
• Description: MCU, 8BIT, 64K FLASH, USB, 64QFN
• Manufacturer: Atmel

Specifications of AT90USB647-MU

• Controller Family/series: AT90
• No. Of I/o's: 48
• Eeprom Memory Size: 2KB
• Ram Memory Size: 4KB
• Cpu Speed: 16MHz
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 64KB
• Oscillator Type: External, Internal
• Package: 64QFN EP
• Device Core: AVR
• Family Name: AT90
• Maximum Speed: 20 MHz
• Ram Size: 4 KB
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 48
• Interface Type: SPI/TWI/USART/USB
• On-chip Adc: 8-chx10-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 4
• Lead Free Status / Rohs Status: Details

Table 30-2.
Notes:
402
Symbol
t
t
t
t
t
t
HIGH
SU;STA
HD;DAT
SU;DAT
SU;STO
BUF
1. In AT90USB64/128, this parameter is characterized and not 100% tested.
2. Required only for f
3. C
4. f
5. This requirement applies to all AT90USB64/128 2-wire Serial Interface operation. Other devices connected to the 2-wire
6. The actual low period generated by the AT90USB64/128 2-wire Serial Interface is (1/f
7. The actual low period generated by the AT90USB64/128 2-wire Serial Interface is (1/f
AT90USB64/128
Serial Bus need only obey the general f
than 6 MHz for the low time requirement to be strictly met at f
ment will not be strictly met for f
communicate at full speed (400 kHz) with other AT90USB64/128 devices, as well as any other device with a proper t
acceptance margin.
Parameter
High period of the SCL clock
Set-up time for a repeated START condition
Data hold time
Data setup time
Setup time for STOP condition
Bus free time between a STOP and START
condition
CK
b
= capacitance of one bus line in pF.
= CPU clock frequency
2-wire Serial Bus Requirements (Continued)
Figure 30-3. 2-wire Serial Bus Timing
SCL
SCL
SDA
> 100 kHz.
t
SU;STA
SCL
> 308 kHz when f
SCL
requirement.
t
HD;STA
t
t
of
LOW
CK
f
f
f
f
f
f
= 8 MHz. Still, AT90USB64/128 devices connected to the bus may
f
f
f
f
f
f
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
Condition
t
HIGH
≤ 100 kHz
> 100 kHz
≤ 100 kHz
> 100 kHz
≤ 100 kHz
> 100 kHz
≤ 100 kHz
> 100 kHz
≤ 100 kHz
> 100 kHz
≤ 100 kHz
> 100 kHz
SCL
t
HD;DAT
= 100 kHz.
t
LOW
t
SU;DAT
SCL
SCL
250
100
Min
4.0
0.6
4.7
0.6
4.0
0.6
4.7
1.3
0
0
- 2/f
- 2/f
CK
CK
), thus f
), thus the low time require-
t
SU;STO
CK
t
r
3.45
Max
0.9
must be greater
–
–
–
–
–
–
–
–
–
–
7593K–AVR–11/09
t
BUF
LOW
Units
µs
µs
µs
µs
µs
µs
ns
ns
µs
µs
µs
µs