PIC16F877A-I/P Microchip Technology, PIC16F877A-I/P Datasheet - Page 633

• Manufacturer Part Number: PIC16F877A-I/P
• Description: IC MCU FLASH 8KX14 EE 40DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F877A-I/P

• Program Memory Type: FLASH
• Program Memory Size: 14KB (8K x 14)
• Package / Case: 40-DIP (0.600", 15.24mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 33
• Eeprom Size: 256 x 8
• Ram Size: 368 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 368 B
• Interface Type: CCP/I2C/MSSP/SPI/USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 33
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163022, DV164120
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 444-1001 - DEMO BOARD FOR PICMICRO MCU
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: PIC16F877AI/P

31.3.6
31.3.7
1997 Microchip Technology Inc.
Tested Crystals and Their Capacitor Values
Example EPROM Memory Erase Times
This table shows the crystal frequency and manufacturer that was used for every tests in this sec-
tion, as well as the capacitor values/ranges that exhibited the best characteristics.
Table 31-2: Example Capacitor Selection for Crystal Oscillators
The UV erase time of an EPROM cell depends on the geometry size of the EPROM cell and the
manufacturing technology.
device.
Table 31-3: Example of Typical EPROM Erase Time Recommendations
Table 31-4:
Note 1: If these criteria are not met, the erase times will be different.
Note:
Example
Device
Crystals Used:
Section 31. Device Characteristics
1
2
3
4
Osc Type
200 kHz
20 MHz
32 kHz
1 MHz
4 MHz
8 MHz
HS
LP
XT
Higher capacitance increases the stability of the oscillator but also increases the start-up time.
These values are for design guidance only.
mode to avoid overdriving crystals with low drive level specification. Since each crystal has its
own characteristics, the user should consult the crystal manufacturer for appropriate values of
external components or verify oscillator performance.
Refer to the device data sheet for the typical erase times for a device.
(Angstroms)
Wavelength
2537
2537
2537
2537
Crystal Frequency
Table 31-3
200 kHz
200 kHz
20 MHz
EPSON CA-301 20.000M-C
32 kHz
1 MHz
4 MHz
4 MHz
8 MHz
EPSON CA-301 8.000M-C
Epson C-001R32.768K-A
STD XTL 200.000KHz
shows some of the expected erase times for each different
ECS ECS-10-13-1
ECS ECS-40-20-1
( W/cm
Intensity
12,000
12,000
12,000
12,000
Capacitor Range
2
)
Rs
may be required in HS mode as well as XT
47-68 pF
15-33 pF
15-33 pF
Distance from UV
C1
lamp (inches)
33 pF
15 pF
15 pF
15 pF
15 pF
1
1
1
1
Capacitor Range
DS31031A-page 31-21
Typical Time
20 PPM
20 PPM
50 PPM
50 PPM
30 PPM
30 PPM
47-68 pF
15-33 pF
15-33 pF
(minutes)
C2
15 - 20
33 pF
15 pF
15 pF
15 pF
15 pF
20
40
60
(1)
31