PIC16F77-I/PT Microchip Technology, PIC16F77-I/PT Datasheet - Page 2

• Manufacturer Part Number: PIC16F77-I/PT
• Description: IC MCU FLASH 8KX14 A/D 44TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F77-I/PT

• Program Memory Type: FLASH
• Program Memory Size: 14KB (8K x 14)
• Package / Case: 44-TQFP, 44-VQFP
• 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
• Ram Size: 368 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 368 B
• Interface Type: I2C/SPI/USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 33
• 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: ICE2000, DM163022
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8-ch x 8-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC16F73/74/76/77
3. Module: Oscillator (HS mode)
DS80099G-page 2
Note:
When resonators above 2 MHz are used, the HS
mode oscillator is required to ensure reliable oper-
ation. HS mode oscillator drive at frequencies from
2 MHz to 4 MHz is often excessive, resulting in the
amplitude of the oscillator waveform exceeding
V
experience distortion as ESD protection devices
begin to operate on the OSC1 and OSC2 pins.
This distortion appears as a non-sinusoidal wave-
form or clipping, and can generate substantial
harmonics that may create excessive noise in the
application.
Revision C silicon will correct this issue.
Work around
The gain of the oscillator should be reduced by
inserting a series resistance between the OSC2
pin and the resonator/capacitor as shown in the
data sheet (see Figure 1). The value of the series
resistance is dependant on V
quency, and temperature; however, 330 ohms has
been used as a good starting point for evaluation.
This change will not affect operation of future
revisions of silicon as long as HS mode is
selected.
DD
and V
This issue applies only to resonators
above 2 MHz in Revision B silicon. No
issues are known to exist with crystals at
any frequency using XT Oscillator mode.
SS
. In such cases, the waveform may
DD
, resonator fre-
FIGURE 1:
Date Codes that pertain to this issue:
PIC16F73/74
PIC16F76/77
C2
C1
XTAL
Rs
CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS, XT OR LP OSC
CONFIGURATION)
OSC1
OSC2
 2003 Microchip Technology Inc.
0219 and earlier
0303 and earlier
RF
SLEEP
PIC16F7X
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Internal
Logic