PIC16F628A-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F628A-I/SO

Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC16F627A/628A/648A

17.6 Timing Diagrams and Specifications

FIGURE 17-4:

EXTERNAL CLOCK TIMING

Q4

OSC1

CLKOUT

Q1

Q2

Q3

1

3

3

2

Q4

Q1

4

4

TABLE 17-4: EXTERNAL CLOCK TIMING REQUIREMENTS

Parameter

No.

Sym

Characteristic

Min Typ† Max Units

Conditions

FOSC External CLKIN Frequency(1) DC

—

4 MHz XT and RC Osc mode,

VDD = 5.0 V

Oscillator Frequency(1)

DC

—

20 MHz HS, EC Osc mode

DC

—

200 kHz LP Osc mode

—

—

4 MHz RC Osc mode, VDD = 5.0V

0.1

—

4 MHz XT Osc mode

1

—

20 MHz HS Osc mode

—

—

200 kHz LP Osc mode

1

TOSC External CLKIN Period(1)

Oscillator Period(1)

—

4

—

48

250

—

50

—

5

—

250

—

— MHz INTOSC mode (fast)

— kHz INTOSC mode (slow)

— ns XT and RC Osc mode

— ns HS, EC Osc mode

— μs LP Osc mode

— ns RC Osc mode

250

— 10,000 ns XT Osc mode

50

— 1,000 ns HS Osc mode

5

—

— μs LP Osc mode

—

250

—

ns INTOSC mode (fast)

—

21

— μs INTOSC mode (slow)

2

TCY Instruction Cycle Time

200

TCY

DC

ns TCY = 4/FOSC

3

TosL, External CLKIN (OSC1) High 100* —

—

ns XT oscillator, TOSC L/H duty

TosH External CLKIN Low

cycle

4

RC External Biased RC

Frequency

10 kHz* — 4 MHz — VDD = 5.0V

* These parameters are characterized but not tested.

† Data in “Typ” column is at 5.0V, 25°C unless otherwise stated. These parameters are for design guidance

only and are not tested.

Note 1:

Instruction cycle period (TCY) equals four times the input oscillator time-based period. All specified values

are based on characterization data for that particular oscillator type under standard operating conditions

with the device executing code. Exceeding these specified limits may result in an unstable oscillator oper-

ation and/or higher than expected current consumption. All devices are tested to operate at “Min” values

with an external clock applied to the OSC1 pin. When an external clock input is used, the “Max” cycle time

limit is “DC” (no clock) for all devices.

DS40044F-page 142

© 2007 Microchip Technology Inc.

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