PIC16C74-20/L Microchip Technology, PIC16C74-20/L Datasheet - Page 140

• Manufacturer Part Number: PIC16C74-20/L
• Description: MICRO CTRL 4K 20MHZ OTP 44PLCC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C74-20/L

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: OTP
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Data Converters: A/D 8x8b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-PLCC
• For Use With: DVA16XL441 - ADAPTER DEVICE ICE 44PLCC
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification
• Eeprom Size: -

PIC16C7X
FIGURE 14-13: EXTERNAL POWER-ON
DS30390E-page 140
Note 1: External Power-on Reset circuit is required
2: R < 40 k is recommended to make sure
3: R1 = 100 to 1 k will limit any current
only if V
diode D helps discharge the capacitor
quickly when V
that voltage drop across R does not violate
the device’s electrical specification.
flowing into MCLR from external capacitor
C in the event of MCLR/V
down due to Electrostatic Discharge
(ESD) or Electrical Overstress (EOS).
D
V
DD
RESET CIRCUIT (FOR SLOW
V
DD
R
DD
C
power-up slope is too slow. The
POWER-UP)
DD
R1
powers down.
PIC16CXX
MCLR
PP
pin break-
FIGURE 14-14: EXTERNAL BROWN-OUT
FIGURE 14-15: EXTERNAL BROWN-OUT
Note 1: This circuit will activate reset when V
Note 1: This brown-out circuit is less expensive,
V
V
2: Internal brown-out detection on the
3: Resistors should be adjusted for the char-
DD
DD
2: Internal brown-out detection on the
3: Resistors should be adjusted for the
goes below (Vz + 0.7V) where Vz = Zener
voltage.
PIC16C72/73A/74A/76/77 should be dis-
abled when using this circuit.
acteristics of the transistor.
R1
R2
33k
albeit less accurate. Transistor Q1 turns
off when V
such that:
PIC16C72/73A/74A/76/77 should be
disabled when using this circuit.
characteristics of the transistor.
V
DD
PROTECTION CIRCUIT 1
PROTECTION CIRCUIT 2
•
10k
DD
R1 + R2
is below a certain level
R1
1997 Microchip Technology Inc.
Q1
40k
40k
= 0.7V
MCLR
V
PIC16CXX
MCLR
V
PIC16CXX
DD
DD
DD