PIC16F871T-I/PT Microchip Technology, PIC16F871T-I/PT Datasheet - Page 629

• Manufacturer Part Number: PIC16F871T-I/PT
• Description: IC MCU FLASH 2KX14 EE 44TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F871T-I/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Size: 3.5KB (2K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: PSP, USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 33
• Number Of Timers: 8
• 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, DM163022
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 28 bit
• For Use With: I3-DB16F871 - BOARD DAUGHTER ICEPIC3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

31.3.4
1997 Microchip Technology Inc.
Oscillator Transconductance
Transconductance of the oscillator indicates the gain of the oscillator. As the transconductance
increases, the gain of the oscillator circuit increases which causes the current consumption of
the oscillator circuit to increase. Also as the transconductance increases the maximum frequency
that the oscillator circuit can support also increases, or the start-up time of the oscillator
decreases.
Figure 31-25: Example Transconductance (gm) of HS Oscillator vs. V
Figure 31-26: Example Transconductance (gm) of LP Oscillator vs. V
Section 31. Device Characteristics
Shaded areas are
beyond recommended range
Shaded area is
beyond recommended range
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
110
100
90
80
70
60
50
40
30
20
10
3.0
0
2.0
2.5
3.5
3.0
4.0
3.5
4.5
4.0
V
DD
V
(Volts)
DD
5.0
4.5
(Volts)
5.0
Max -40 C
5.5
Typ 25 C
Min 85 C
Max -40 C
5.5
Typ 25 C
Min 85 C
6.0
6.0
DD
DS31031A-page 31-17
DD
6.5
6.5
7.0
7.0
31