AT80C51RD2-SLSUM Atmel, AT80C51RD2-SLSUM Datasheet - Page 63

• Manufacturer Part Number: AT80C51RD2-SLSUM
• Description: MCU, 8BIT, 8051, 5V, SPI, 20MHZ, 44PLCC
• Manufacturer: Atmel

Specifications of AT80C51RD2-SLSUM

• Controller Family/series: (8051) 8052
• No. Of I/o's: 32
• Ram Memory Size: 1280Byte
• Cpu Speed: 40MHz
• No. Of Timers: 3
• No. Of Pwm Channels: 5
• Core Size: 8bit
• Oscillator Type: External Only
• Processor Series: AT80x
• Core: 8051
• Data Bus Width: 8 bit
• Program Memory Type: ROMLess
• Data Ram Size: 1280 B
• Interface Type: UART, SPI
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: PLCC
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: - 40 C
• Cpu Family: AT80
• Device Core: 8051
• Device Core Size: 8b
• Frequency (max): 40MHz
• Program Memory Size: Not Required
• Total Internal Ram Size: 1.25KB
• # I/os (max): 32
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 44
• Package Type: PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4188F–8051–01/08
T
T
Table 11-3. gives the maximum applicable load capacitance for Port 0, Port 1, 2 and 3, and ALE
and PSEN signals. Timings will be guaranteed if these capacitances are respected. Higher
capacitance values can be used, but timings will then be degraded.
Table 11-3.
Table 11-5., Table 39. and Table 42. give the description of each AC symbols.
Table 11-6., Table 11-8. and Table 11-10. give for each range the AC parameter.
Table 11-7., Table 11-9. and Table 11-11. give the frequency derating formula of the AC param-
eter. To calculate each AC symbols, take the x value corresponding to the speed grade you
need (-M, -V or -L) and replace this value in the formula. Values of the frequency must be limited
to the corresponding speed grade:
Table 11-4.
Example:
T
A
A
LLIV
ALE / PSEN
Freq (MHz)
Port 1, 2, 3
= 0 to +70°C (commercial temperature range); V
= -40°C to +85°C (industrial temperature range); V
T (ns)
Port 0
in X2 mode for a -V part at 20 MHz (T = 1/20
x= 22 (Table 11-7.)
T= 50ns
T
Load Capacitance versus speed range, in pF
Max frequency for derating formula regarding the speed grade
LLIV
-M X1 mode
= 2T - x = 2 x 50 - 22 = 78ns
40
25
100
100
-M
80
-M X2 mode
20
50
-V X1 mode
40
25
E6
SS
= 50 ns):
SS
= 0 V; 2.7 V < V
-V
50
50
30
= 0 V; 2.7 V < V
-V X2 mode
33.3
30
AT/TS8xC51Rx2
CC <
-L X1 mode
CC <
33.3
30
5.5 V; -L range.
5.5 V; -L range.
100
100
80
-L
-L X2 mode
20
50
63