Underwriters Laboratories DS-2CD702NF-E Especificaciones descargar pdf

General Description

The DS12885, DS12887, and DS12C887 real-time

clocks (RTCs) are designed to be direct replacements

for the DS1285 and DS1287. The devices provide a

real-time clock/calendar, one time-of-day alarm, three

maskable interrupts with a common interrupt output, a

programmable square wave, and 114 bytes of battery-

backed static RAM (113 bytes in the DS12C887 and

DS12C887A). The DS12887 integrates a quartz crystal

and lithium energy source into a 24-pin encapsulated

DIP package. The DS12C887 adds a century byte at

address 32h. For all devices, the date at the end of the

month is automatically adjusted for months with fewer

than 31 days, including correction for leap years. The

devices also operate in either 24-hour or

12-hour format with an AM/PM indicator. A precision

temperature-compensated circuit monitors the status of

. If a primary power failure is detected, the device

automatically switches to a backup supply. A lithium

coin-cell battery can be connected to the V

BAT

input

pin on the DS12885 to maintain time and date operation

when primary power is absent. The device is accessed

through a multiplexed byte-wide interface, which sup-

ports both Intel and Motorola modes.

Applications

Embedded Systems

Utility Meters

Security Systems

Network Hubs, Bridges, and Routers

Features

♦ Drop-In Replacement for IBM AT Computer

Clock/Calendar

♦ RTC Counts Seconds, Minutes, Hours, Day, Date,

Month, and Year with Leap Year Compensation

Through 2099

♦ Binary or BCD Time Representation

♦ 12-Hour or 24-Hour Clock with AM and PM in

12-Hour Mode

♦ Daylight Saving Time Option

♦ Selectable Intel or Motorola Bus Timing

♦ Interfaced with Software as 128 RAM Locations

♦ 14 Bytes of Clock and Control Registers

♦ 114 Bytes of General-Purpose, Battery-Backed

RAM (113 Bytes in the DS12C887 and

DS12C887A)

♦ RAM Clear Function (DS12885, DS12887A, and

DS12C887A)

♦ Interrupt Output with Three Independently

Maskable Interrupt Flags

♦ Time-of-Day Alarm Once Per Second to Once

Per Day

♦ Periodic Rates from 122μs to 500ms

♦ End-of-Clock Update Cycle Flag

♦ Programmable Square-Wave Output

♦ Automatic Power-Fail Detect and Switch Circuitry

♦ Optional 28-Pin PLCC Surface Mount Package or

32-Pin TQFP (DS12885)

♦ Optional Encapsulated DIP (EDIP) Package with

Integrated Crystal and Battery (DS12887,

DS12887A, DS12C887, DS12C887A)

♦ Optional Industrial Temperature Range Available

♦ Underwriters Laboratory (UL) Recognized

DS12885/DS12887/DS12887A/DS12C887/DS12C887A

Real-Time Clocks

______________________________________________

Maxim Integrated Products

DS12885

DS83C520

R/W

GND

X2X1

CRYSTAL

BAT

AD(0–7) SQW

RESET

IRQ

RCLR

MOT

Typical Operating Circuit

19-5213; Rev 4; 4/10

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Pin Configurations and Ordering Information appear at end of data sheet.

1 2 3 4 5 6 ... 21 22

Real-Time Clocks 1

Indice de contenidos

Pagina 1 - Real-Time Clocks

General DescriptionThe DS12885, DS12887, and DS12C887 real-timeclocks (RTCs) are designed to be direct replacementsfor the DS1285 and DS1287. The devi

Pagina 2

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks10 ____________________________________________________________________Pin Description (con

Pagina 3

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks____________________________________________________________________ 11Detailed Description

Pagina 4

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks12 ____________________________________________________________________Clock AccuracyThe ac

Pagina 5

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks____________________________________________________________________ 13The three alarm byte

Pagina 6

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks14 ____________________________________________________________________Table 2B. Time, Cale

Pagina 7

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks____________________________________________________________________ 15Bit 7: Update-In-Pro

Pagina 8

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks16 ____________________________________________________________________Bit 7: SET. When the

Pagina 9

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks____________________________________________________________________ 17Bit 7: Interrupt Req

Pagina 10

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks18 ____________________________________________________________________Century Register(DS1

Pagina 11

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks____________________________________________________________________ 19Update CycleThe devi

Pagina 12

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks2 _____________________________________________________________________ABSOLUTE MAXIMUM RAT

Pagina 13

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks20 ____________________________________________________________________24232221201918171234

Pagina 14

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks____________________________________________________________________ 21PACKAGE THETA-JA (°C

Pagina 15

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time ClocksMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely e

Pagina 16

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks_____________________________________________________________________ 3DC ELECTRICAL CHARAC

Pagina 17

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks4 _____________________________________________________________________PWASHPWELtASEDtCYCtR

Pagina 18

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks_____________________________________________________________________ 5tCStAHLtASLtCYCPWASH

Pagina 19

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks6 _____________________________________________________________________POWER-UP/POWER-DOWN

Pagina 20

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks_____________________________________________________________________7Typical Operating Cha

Pagina 21

DS12885/DS12887/DS12887A/DS12C887/DS12C887AReal-Time Clocks8 _____________________________________________________________________Pin DescriptionPINSO

Pagina 22

DS12885/DS12887/DS12887A/DS12C887/DS12C887APin Description (continued)PINSO,PDIPEDIP PLCC TQFPNAME FUNCTION222, 3,16, 20,21, 221, 11,13, 18,264, 6, 10

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Underwriters Laboratories DS-2CD702NF-E Especificaciones

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