PIC16C433-E/SO Microchip Technology, PIC16C433-E/SO Datasheet - Page 55

• Manufacturer Part Number: PIC16C433-E/SO
• Description: IC MCU CMOS 8BIT 10MHZ 2K 18SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C433-E/SO

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: LIN (Local Interconnect Network)
• Peripherals: POR, WDT
• Number Of I /o: 5
• Program Memory Size: 3.5KB (2K x 14)
• Program Memory Type: OTP
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 4x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 18-SOIC (7.5mm Width)
• For Use With: AC164030 - MODULE SKT PROMATEII 28DIP/SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

9.2.3
Either a pre-packaged oscillator, or a simple oscillator
circuit with TTL gates, can be used as an external crys-
tal oscillator circuit. Pre-packaged oscillators provide a
wide operating range and better stability. A well
designed crystal oscillator will provide good perfor-
mance with TTL gates. Two types of crystal oscillator
circuits can be used; one with parallel resonance, or
one with series resonance.PIC16C433
Figure 9-3 shows implementation of a parallel resonant
oscillator circuit. The circuit is designed to use the fun-
damental frequency of the crystal. The 74AS04 inverter
performs the 180-degree phase shift that a parallel
oscillator requires. The 4.7 kΩ resistor provides the
negative feedback for stability. The 10 kΩ potentiome-
ters bias the 74AS04 in the linear region. This circuit
could be used for external oscillator designs.
FIGURE 9-3:
Figure 9-4 shows a series resonant oscillator circuit.
This circuit is also designed to use the fundamental fre-
quency of the crystal. The inverter performs a 180-
degree phase shift in a series resonant oscillator cir-
cuit. The 330 Ω resistors provide the negative feedback
to bias the inverters in their linear region.
FIGURE 9-4:
 2002 Microchip Technology Inc.
74AS04
330
10k
EXTERNAL CRYSTAL OSCILLATOR
CIRCUIT
+5V
20 pF
10k
0.1 µF
XTAL
74AS04
XTAL
4.7k
EXTERNAL PARALLEL
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
EXTERNAL SERIES
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
74AS04
20 pF
330
10k
74AS04
74AS04
To Other
Devices
To Other
Devices
PIC16C433
CLKIN
PIC16C433
CLKIN
Preliminary
9.2.4
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 9-5 shows how the R/C combination is con-
nected to the PIC16C433. For R
2.2 kΩ, the oscillator operation may become unstable
or stop completely. For very high R
(i.e., 1 MΩ), 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 variation is greater for larger R (since leakage cur-
rent variation will affect RC frequency more for large R)
and for smaller C (since variation of input capacitance
will affect RC frequency more).
FIGURE 9-5:
EXT
EXT
C
V
R
SS
EXT
EXT
EXT
values. The user also needs to take into account
between 3 kΩ and 100 kΩ.
V
DD
F
EXTERNAL RC OSCILLATOR
) and capacitor (C
OSC
EXT
/4
= 0 pF), we recommend using values
EXTERNAL RC OSCILLATOR
MODE
OSC1
OSC2/CLKOUT
PIC16C433
EXT
N
) values, and the operat-
EXT
DS41139B-page 53
PIC16C433
values below
EXT
Internal
Clock
values