PIC16C56A/JW Microchip Technology, PIC16C56A/JW Datasheet - Page 19

• Manufacturer Part Number: PIC16C56A/JW
• Description: IC MCU EPROM 1KX12 18CDIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C56A/JW

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: POR, WDT
• Number Of I /o: 12
• Program Memory Size: 1.5KB (1K x 12)
• Program Memory Type: EPROM, UV
• Ram Size: 25 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 18-CDIP (0.300", 7.62mm) Window
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Connectivity: -

4.4
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 compo-
nents used.
Figure 4-5 shows how the R/C combination is con-
nected to the PIC16C5X. For R
2.2 k , the oscillator operation may become unstable,
or stop completely. For very high R
(e.g., 1 M ) the oscillator becomes sensitive to noise,
humidity and leakage. Thus, we recommend keeping
R
Although the oscillator will operate with no external
capacitor (C
above 20 pF for noise and stability reasons. With no or
small external capacitance, the oscillation frequency
can vary dramatically due to changes in external
capacitances, such as PCB trace capacitance or pack-
age lead frame capacitance.
The Electrical Specifications sections show RC fre-
quency variation from part to part due to normal pro-
cess variation. The variation is larger for larger R (since
leakage current variation will affect RC frequency more
for large R) and for smaller C (since variation of input
capacitance will affect RC frequency more).
Also, see the Electrical Specifications sections for vari-
ation of oscillator frequency due to V
C
ating temperature for given R, C, and V
The oscillator frequency, divided by 4, is available on
the OSC2/CLKOUT pin, and can be used for test pur-
poses or to synchronize other logic.
EXT
EXT
EXT
2002 Microchip Technology Inc.
EXT
between 3 k and 100 k .
values as well as frequency variation due to oper-
values. The user also needs to take into account
RC Oscillator
) and capacitor (C
EXT
= 0 pF), we recommend using values
EXT
) values, and the operat-
EXT
DD
for given R
DD
values below
EXT
values.
values
EXT
Preliminary
/
FIGURE 4-5:
C
V
Note:
R
EXT
SS
EXT
V
DD
If you change from this device to another
device, please verify oscillator characteris-
tics in your application.
Fosc/4
RC OSCILLATOR MODE
OSC2/CLKOUT
OSC1
N
PIC16C5X
DS30453D-page 17
PIC16C5X
Internal
clock