PIC18F4580-E/PT Microchip Technology, PIC18F4580-E/PT Datasheet - Page 340

• Manufacturer Part Number: PIC18F4580-E/PT
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,TQFP,44PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4580-E/PT

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: CAN, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC18F2480/2580/4480/4580
Table 24-3 shows the relation between the clock
generated by the PLL and the frequency error from
jitter (measured jitter-induced error of 2%, Gaussian
distribution, within 3 standard deviations), as a
percentage of the nominal clock frequency.
TABLE 24-3:
TABLE 24-4:
DS39637D-page 340
40 MHz
24 MHz
16 MHz
Output
Nominal PLL Output
PLL
40 MHz
24 MHz
16 MHz
0.83 ns
1.25 ns
0.5 ns
P
jitter
FREQUENCY ERROR FROM JITTER AT VARIOUS PLL-GENERATED CLOCK SPEEDS
TOTAL FREQUENCY ERROR AT VARIOUS PLL-GENERATED CLOCK SPEEDS
(100 PPM OSCILLATOR DRIFT, INCLUDING ERROR FROM JITTER)
1.67 ns
2.5 ns
T
(125 Kb/s)
1 ns
0.01125%
0.01209%
0.01313%
jitter
8 μs
Frequency Error at Various Nominal Bit Times (Bit Rates)
(125 Kb/s)
0.00125%
0.00209%
0.00313%
8 μs
Frequency Error at Various Nominal Bit Times (Bit Rates)
(250 Kb/s)
0.01250%
0.01418%
0.01625%
4 μs
This is clearly smaller than the expected drift of a
crystal oscillator, typically specified at 100 ppm or
0.01%. If we add jitter to oscillator drift, we have a total
frequency drift of 0.0132%. The total oscillator
frequency errors for common clock frequencies and bit
rates, including both drift and jitter, are shown in
Table 24-4.
(250 Kb/s)
0.00250%
0.00418%
0.00625%
4 μs
(500 Kb/s)
0.015%
0.018%
0.023%
2 μs
(500 Kb/s)
0.005%
0.008%
0.013%
2 μs
© 2009 Microchip Technology Inc.
(1 Mb/s)
0.027%
0.035%
0.02%
(1 Mb/s)
1 μs
0.017%
0.025%
0.01%
1 μs