PIC16C74AT-10/L View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C74AT-10/L

8-Bit CMOS Microcontrollers with A/D Converter

Microchip Technology 

PIC16C7X

17.5 Timing Diagrams and Specifications

FIGURE 17-2: EXTERNAL CLOCK TIMING

Q4

Q1

Q2

Applicable Devices 72 73 73A 74 74A 76 77

Q3

Q4

Q1

OSC1

CLKOUT

1

3

3

4

4

2

TABLE 17-2: EXTERNAL CLOCK TIMING REQUIREMENTS

Parameter Sym Characteristic

No.

Min Typ† Max Units Conditions

1

2

3

4

†

Note 1:

Fosc External CLKIN Frequency

(Note 1)

DC

—

DC

—

4

MHz XT and RC osc mode

4

MHz HS osc mode (-04)

DC

—

10

MHz HS osc mode (-10)

DC

—

20

MHz HS osc mode (-20)

DC

—

200

kHz LP osc mode

Oscillator Frequency

(Note 1)

DC

—

0.1

—

4

MHz RC osc mode

4

MHz XT osc mode

4

—

5

—

20

MHz HS osc mode

200

kHz LP osc mode

Tosc External CLKIN Period

(Note 1)

250 —

250 —

—

ns XT and RC osc mode

—

ns HS osc mode (-04)

100 —

—

ns HS osc mode (-10)

50

—

—

ns HS osc mode (-20)

5

—

—

µs LP osc mode

Oscillator Period

(Note 1)

250 —

—

ns RC osc mode

250 — 10,000 ns XT osc mode

250 —

250

ns HS osc mode (-04)

100 —

50

—

250

ns HS osc mode (-10)

250

ns HS osc mode (-20)

5

—

—

µs LP osc mode

TCY Instruction Cycle Time (Note 1)

200 —

DC

ns TCY = 4/FOSC

TosL, External Clock in (OSC1) High or 100 —

TosH Low Time

2.5

—

—

ns XT oscillator

—

µs LP oscillator

15

—

—

ns HS oscillator

TosR, External Clock in (OSC1) Rise or —

—

TosF Fall Time

—

—

25

ns XT oscillator

50

ns LP oscillator

—

—

15

ns HS oscillator

Data in "Typ" column is at 5V, 25˚C unless otherwise stated. These parameters are for design guidance only and are not

tested.

Instruction cycle period (TCY) equals four times the input oscillator time-base 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 operation and/or higher than expected current con-

sumption. All devices are tested to operate at "min." values with an external clock applied to the OSC1/CLKIN pin.

When an external clock input is used, the "Max." cycle time limit is "DC" (no clock) for all devices.

© 1997 Microchip Technology Inc.

DS30390E-page 173

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