PIC16F874A-E/ML Microchip Technology, PIC16F874A-E/ML Datasheet - Page 41
![IC MCU FLASH 4KX14 A/D 44QFN](/photos/6/81/68122/150-44-qfn_sml.jpg)
PIC16F874A-E/ML
Manufacturer Part Number
PIC16F874A-E/ML
Description
IC MCU FLASH 4KX14 A/D 44QFN
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16F688T-ISL.pdf
(688 pages)
3.PIC16C770-ISO.pdf
(8 pages)
4.PIC16F873A-ISO.pdf
(234 pages)
5.PIC16F873A-ISO.pdf
(6 pages)
6.PIC16F873A-ISO.pdf
(4 pages)
7.PIC16F873A-ISO.pdf
(6 pages)
8.PIC16F873A-ISO.pdf
(4 pages)
9.PIC16F873A-ISO.pdf
(22 pages)
Specifications of PIC16F874A-E/ML
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
Program Memory Size
7KB (4K x 14)
Program Memory Type
FLASH
Eeprom Size
128 x 8
Ram Size
192 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 125°C
Package / Case
44-QFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- PIC16F616T-ISL PDF datasheet
- PIC16F688T-ISL PDF datasheet #2
- PIC16C770-ISO PDF datasheet #3
- PIC16F873A-ISO PDF datasheet #4
- PIC16F873A-ISO PDF datasheet #5
- PIC16F873A-ISO PDF datasheet #6
- PIC16F873A-ISO PDF datasheet #7
- PIC16F873A-ISO PDF datasheet #8
- PIC16F873A-ISO PDF datasheet #9
- Current page: 41 of 688
- Download datasheet (3Mb)
2.3.5
1997 Microchip Technology Inc.
External Crystal Oscillator Circuit for Device Clock
Sometimes more than one device needs to be clocked from a single crystal. Since Microchip
does not recommend connecting other logic to the PICmicro’s internal oscillator circuit, an exter-
nal crystal oscillator circuit is recommended. Each device will then have an external clock source,
and the number of devices that can be driven will depend on the buffer drive capability. This circuit
is also useful when more than one device (PICmicro) needs to operate synchronously to each
other.
Either a prepackaged oscillator can be used or a simple oscillator circuit with TTL gates can be
built. Prepackaged oscillators provide a wide operating range and better stability. A well-designed
crystal oscillator will provide good performance with TTL gates. Two types of crystal oscillator cir-
cuits can be used; one with series resonance, or one with parallel resonance.
Figure 2-4
designed to use the fundamental frequency of the crystal. The 74AS04 inverter performs the
180-degree phase shift that a parallel oscillator requires. The 4.7 k resistor provides the nega-
tive feedback for stability. The 10 k potentiometer biases the 74AS04 in the linear region.
Figure 2-4: External Parallel Resonant Crystal Oscillator Circuit
Figure 2-5
the fundamental frequency of the crystal. The inverter performs a 180-degree 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 2-5: External Series Resonant Crystal Oscillator Circuit
When the device is clocked from an external clock source (as in
the microcontroller’s oscillator must be configured for LP, XT or HS mode
shows an external series resonant oscillator circuit. This circuit is also designed to use
shows implementation of an external parallel resonant oscillator circuit. The circuit is
74AS04
330 k
10 k
+5V
20 pF
10k
0.1 F
XTAL
74AS04
XTAL
4.7 k
Section 2. Oscillator
20 pF
74AS04
330 k
10 k
74AS04
74AS04
To Other
Devices
To Other
Devices
PIC16CXXX
CLKIN
Figure 2-4
PIC16CXXX
CLKIN
(Figure
DS31002A-page 2-11
or
Figure
2-3).
2-5) then
2
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