PIC16F84A-20I-SO - N/A - Datasheet.Directory

 2001 Microchip Technology Inc. DS30072B-page 1

DEVICE MIGRATIONS

This document is intended to describe the functional differences and the electrical specification differences that are

present when migrating from one device to the next. Table 1 -1 shows the considerations that must be take n into account

when migrating from the PIC16F84 to the PIC16F84A. Table 2 shows electrical and timing differences.

TABLE 1: PIC16F84 → PIC16F84A FUNCTIONAL DIFFERENCES

OSCILLATOR

The PIC 16F84A can use crysta ls u p to 20 MH z, r esulti ng in doub le the exe cution spee d. N o ch anges to th e cod e, oth er

than for timing concerns, are required. No changes to the configuration word are required. The crystal loading capacitors

may need to be adjusted for the higher speed crystal, but verifying oscillator operation at the same speed is already

recommended for the transition from the PIC16F84 to the PIC16F84A.

Note: This device has be en designed to perform to the p arameters of it s data s heet. It has been tested to an elec -

trical specification designed to determine its conformance with these parameters. Due to process differ-

ences in the ma nufact ure of this d evice, t his d evice may have dif fe rent pe rforman ce ch aracter istic s than it s

earlier version. The se differen ce s ma y ca us e this dev ic e to pe rform differently in your application than the

earlier version of this device.

Note: The user should verify that the device oscillator starts and performs as expected. Adjusting the loading

capacitor values and/or the oscillator mode may be required.

No. Module Differences from PIC16F84 H/W S/W

1 Oscillator The PIC16F84 oscillator can run up to 10 MHz.

The PIC16F84A oscillator can run up to 20 MHz. Yes Yes

Legend: H/W - Issues may exist with regard to the application circuit.

S/W - Issues may exist with regard to the user program.

PIC16F84 → PIC16F84A Migration

DS30072B-Page 2  2001 Microchip Technology Inc.

TABLE 2: PIC16F84 → PIC16F84A SPECIFICATION DIFFERENCES

Param

No. Symbol Characteristic PIC16F84 PIC16F84A Units

Min Typ† Max Min Typ† Max

Core FOSC Eternal CLKIN Frequency (HS mode)

Oscil la tor Fr equ enc y (H S mode ) DC

1—

—10

10 DC

1—

—20

20 MHz

MHz

D001

D001A VDD

VDD Supply Voltage (XT, RC, LP modes)

Supply Voltage (HS mode) 4.0

4.5 —

—6.0

6.0 4.0

4.5 —

—5.5

5.5 V

30 TmcL MCLR puls e width (l ow) 1 — — 2——µS

D004A SVDD VDD rise rate to ensure internal

Power-on Reset signal (PWRT

disabled)

N/A N/A N/A TBD ——V/mS

D010A IDD Supply current during FLASH

programming (FOSC = 4.0 MHz,

VDD = 5.5V)

—7.310 — 3.0 10 mA

D013 IDD Supply Current HS

mode (VDD = 5.5V) PIC16F84

(FOSC = 10 MHz) —510 mA

PIC16F84A

(FOSC = 20 MHz) —10 20 mA

D021 IPD Power-down cur-

rent (VDD = 4.0V,

WDT disabled)

Commercial — 1.0 14 µA

D021A Industrial — 1.0 16 — 1.0 3.0 µA

D022 ∆IWDT Module Differential

Current Watchdog

Timer

Commercial N/A N/A N/A — 6.0 20 µA

Extended N/A N/A N/A — — 25 µA

D040

D040A

D041

VIH Input High Voltage

I/O Ports

with TTL buffer (4.5V<VDD<5.5V)(1)

(VDD = Entire Range) (1)

with Schmitt Trigger

2.4

0.48VDD

0.45VDD

—

VDD

2.0

0.25VDD+0.8

0.8VDD

—

VDD

D042 MCLR, RA4/T0CKI OSC1 (RC mode) 0.85VDD —VDD 0.8VDD —VDD V

D043

D043A OSC1 (XT, HS and LP modes)

OSC1 (RC mode) 0.7VDD

N/A —

N/A VDD

N/A 0.7VDD

0.9VDD —

—VDD

VDD V

D050 VHYS Hysteresis of Schmitt Trigger inputs TBD — — — 0.1 —V

EEPROM Data Memory

D121 VDRW VDD for read/write VMIN —6.0 VMIN —5.5 V

D122 TDEW Erase/W ri te Cycle Time — 10 20 — 48mS

FLASH Program Memory

D131 VPR VDD for read VMIN —6.0 VMIN —5.5 V

D133 TDEW Erase/W ri te Cycle Time — 10 — — 48mS

† Data in “Typ” column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance only and are

not tested.

Note 1: The user may choose the better of the two specifications.

 2001 Microchip Technology Inc. DS30072B - page 3

Information contained in this publication regarding device

applications and the like is intended through suggestion only

and may be superseded by updates. It is your responsibility to

ensure that your application meets with your specifications.

No representation or warranty is given and no liability is

assumed by Microc hip Technology Incorporated with respect

to the accuracy or use of such inform ation, or infringement of

patents or other intellectual property rights arising from such

use or otherwise. Use of Microchip’s products as critical com-

ponents in life support systems is not authorized except with

express written approval by Microchip. No licenses are con-

veyed, implicitly or otherwise, under any intellectual property

rights.

Trademarks

The Mi crochip name and logo, the Micr ochip lo go, PIC, PICm icro,

PICMASTER, PICSTART, PRO MATE, KEELOQ, SEEVAL,

MPLAB and The Embedded Control Solutions Company are reg-

istered trademarks of Microchip Tech nology Incorporated in th e

U.S.A. and other countries.

Total Endurance, ICSP , In-Circuit Serial Programming, FilterLab,

MXDEV, microID,

Flex

ROM,

fuzzy

LAB, MPASM, MPLINK,

MPLIB, PICC, PICDEM, PICDEM.net, ICEPIC, Migratable

Memory, FanSense, ECONOMONITOR, Select Mode, dsPIC,

rfPIC and microPort are trademarks of Microchip Technology

Incorporated in the U.S.A.

Serialized Quick Term Programming (SQTP) is a service mark

of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their

respective companies.

Printed on recycled paper.

Microchip received QS-9000 quality system

certific at ion for i ts worldwid e headquart ers,

design and wafer fabrication facilities in

Chandler and Tempe, Arizona in July 1999. The

Company’s quality system processes and

procedures are QS-9000 compliant for its

PICmicro

8-bit MCUs, KEELOQ

cod e ho pp in g

devices, Serial EEPROMs and microperipheral

products. In addition, Microchip’s quality

system for the design and manufacture of

development systems is ISO 9001 certified.

Note the following details of the code protection feature on PICmicro® MCUs.

• The PICmicro family meets the specifications contained in the Microchip Data Sheet.

• Microchip believes that its family of PICmicro microcontrollers is one of the most secure products of its kind on the market t oday,

when used in the intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our know l-

edge, require using the PICmicro microcontroller in a manner outside the operating specifications contained in the data sheet.

The person doing so may be engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not

mean that we are guaranteeing the product as “unbreakable”.

• Code protection is constantly evolving. W e at Microchip are committed to continuously improving the code protection features of

our product.

If you have any further questions about this matter, please contact the local sales office nearest to you.

DS30072B-page 4  2001 Microchip Technology Inc.

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