PIC16F627A-I/SO Microchip Technology, PIC16F627A-I/SO Datasheet - Page 98

• Manufacturer Part Number: PIC16F627A-I/SO
• Description: IC MCU FLASH 1KX14 EEPROM 18SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F627A-I/SO

• Program Memory Type: FLASH
• Program Memory Size: 1.75KB (1K x 14)
• Package / Case: 18-SOIC (7.5mm Width)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 16
• Eeprom Size: 128 x 8
• Ram Size: 224 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 224 B
• Interface Type: SCI/USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 16
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163014, DM164120-4
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT18SO-1 - SOCKET TRANSITION 18SOIC 300MILI3DBF648 - BOARD DAUGHTER ICEPIC3AC162053 - HEADER INTERFACE ICD,ICD2 18DIPAC164010 - MODULE SKT PROMATEII DIP/SOIC
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC16F627A/628A/648A
FIGURE 14-2:
Figure 14-3 shows a series resonant oscillator circuit.
This circuit is also designed to use the fundamental
frequency of the crystal. The inverter performs a 180
phase shift in a series resonant oscillator circuit. The
330 k resistors provide the negative feedback to bias
the inverters in their linear region.
FIGURE 14-3:
14.2.4
The internal precision oscillator provides a fixed 4 MHz
(nominal) system clock at V
Section 17.0 "Electrical Specifications", for informa-
tion on variation over voltage and temperature.
14.2.5
For applications where a clock is already available
elsewhere, users may directly drive the PIC16F627A/
628A/648A provided that this external clock source
meets the AC/DC timing requirements listed in
Section 17.6 "Timing Diagrams and Specifica-
tions". Figure 14-4 below shows how an external clock
circuit should be configured.
DS40044B-page 96
10K
74AS04
330 K
+5V
10K
C1
74AS04
XTAL
4.7K
PRECISION INTERNAL 4 MH
OSCILLATOR
EXTERNAL CLOCK IN
0.1 PF
XTAL
C2
74AS04
330 K
10K
EXTERNAL PARALLEL
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
EXTERNAL SERIES
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
74AS04
DD
TO OTHER
DEVICES
74AS04
= 5 V and 25 C. See
PIC16F627A/628A/648A
TO OTHER
CLKIN
DEVICES
PIC16F627A/
628A/648A
Z
CLKIN
Preliminary
FIGURE 14-4:
14.2.6
For applications where precise timing is not a require-
ment, the RC oscillator option is available. The
operation and functionality of the RC oscillator is
dependent upon a number of variables. The RC
oscillator frequency is a function of:
• Supply voltage
• Resistor (R
• Operating temperature.
The oscillator frequency will vary from unit to unit due
to normal process parameter variation. The difference
in lead frame capacitance between package types will
also affect the oscillation frequency, especially for low
C
tolerance of the external R and C components.
Figure 14-5 shows how the R/C combination is
connected.
FIGURE 14-5:
The RC Oscillator mode has two options that control
the unused OSC2 pin. The first allows it to be used as
a general purpose I/O port. The other configures the
pin as an output providing the Fosc signal (internal
clock divided by 4) for test or external synchronization
purposes.
14.2.7
The PIC16F627A/628A/648A can be configured to
provide a clock out signal by programming the configu-
ration word. The oscillator frequency, divided by 4 can
be used for test purposes or to synchronize other logic.
C
EXT
V
R
EXT
SS
EXT
Clock From
ext. system
F
values. The user also needs to account for the
V
OSC
DD
RA6
/4
RC OSCILLATOR
CLKOUT
EXT
CLKIN
RA7/OSC1/
RA6/OSC2/CLKOUT
) and capacitor (C
PIC16F627A/628A/648A
EXTERNAL CLOCK INPUT
OPERATION (EC, HS, XT
OR LP OSC
CONFIGURATION)
RC OSCILLATOR MODE
 2004 Microchip Technology Inc.
RA6/OSC2/CLKOUT
RA7/OSC1/CLKIN
PIC16F627A/628A/648A
EXT
) values
Internal
Clock