PIC16F870-I/SP Microchip Technology Inc., PIC16F870-I/SP Datasheet - Page 92

• Manufacturer Part Number: PIC16F870-I/SP
• Description: 28 PIN, 7 KB FLASH, 128 RAM, 22 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F870-I/SP

• A/d Inputs: 5-Channel, 10-Bit
• Cpu Speed: 5 MIPS
• Eeprom Memory: 64 Bytes
• Input Output: 22
• Interface: USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 28-pin SPDIP
• Programmable Memory: 3.5K Bytes
• Ram Size: 128 Bytes
• Speed: 20 MHz
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC16F870/871
TABLE 11-2:
DS30569B-page 90
These values are for design guidance only.
See notes following this table.
Osc Type
200 kHz
20 MHz
32 kHz
1 MHz
4 MHz
8 MHz
Note 1: Higher capacitance increases the stability
XT
HS
LP
2: Since each resonator/crystal has its own
3: R
4: When migrating from other PICmicro
EPSON CA-301 20.000M-C
EPSON CA-301 8.000M-C
of oscillator, but also increases the
start-up time.
characteristics, the user should consult
the resonator/crystal manufacturer for
appropriate values of external components.
as XT mode, to avoid overdriving crystals
with low drive level specification.
devices, oscillator performance should be
verified.
Epson C-001R32.768K-A
200 kHz
200 kHz
20 MHz
Crystal
32 kHz
s
1 MHz
4 MHz
4 MHz
8 MHz
Freq.
STD XTL 200.000KHz
may be required in HS mode, as well
ECS ECS-10-13-1
ECS ECS-40-20-1
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
Crystals Used
Cap. Range
47-68 pF
15-33 pF
15-33 pF
33 pF
15 pF
15 pF
15 pF
15 pF
C1
Cap. Range
± 20 PPM
± 20 PPM
± 50 PPM
± 50 PPM
± 30 PPM
± 30 PPM
47-68 pF
15-33 pF
15-33 pF
33 pF
15 pF
15 pF
15 pF
15 pF
C2
®
11.2.3
For timing insensitive applications, the “RC” device
option offers additional cost savings. The RC oscillator
frequency is a function of the supply voltage, the resis-
tor (R
ing temperature. In addition to this, the oscillator
frequency will vary from unit to unit due to normal pro-
cess parameter variation. Furthermore, the difference
in lead frame capacitance between package types will
also affect the oscillation frequency, especially for low
C
variation due to tolerance of external R and C
components used. Figure 11-3 shows how the R/C
combination is connected to the PIC16F870/871.
FIGURE 11-3:
EXT
C
V
Recommended values: 3 k
R
EXT
SS
EXT
EXT
values. The user also needs to take into account
V
DD
) and capacitor (C
RC OSCILLATOR
F
OSC
/4
RC OSCILLATOR MODE
OSC1
OSC2/CLKO
C
 2003 Microchip Technology Inc.
EXT
EXT
> 20pF
) values, and the operat-
R
EXT
100 k
PIC16F870/871
Internal
Clock