DS1216B Dallas Semiconductor, DS1216B Datasheet

DS1216B

Manufacturer Part Number

DS1216B

Description

Smart Watch, Socket Mounted; DIP; 28; -0.3 to .0; 0 to degC; -40 to degC

Manufacturer

Dallas Semiconductor

Datasheet

1.DS1216B.pdf (2 pages)

Specifications of DS1216B

Application

Watch function remains transparent to RAM

Capacitance

5 pF (Max.) (Input), 7 pF (Max.) (Output)

Number Of Pins

Package Type

DIP

Temperature, Operating

0 to +70 °C

Temperature, Storage

-40 to +70 °C

Voltage, Ground

-0.3 to +7.0

Available stocks

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Price

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Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.

GENERAL DESCRIPTION

The DS1216 SmartWatch RAM and SmartWatch

ROM sockets are 600-mil-wide DIP sockets with a

built-in CMOS watch function, an NV RAM

controller circuit, and an embedded lithium energy

source. The sockets provide an NV RAM solution

for memory sized from 2k x 8 to 512k x 8 with

package sizes from 26 pins to 32 pins. When a

socket is mated with a CMOS SRAM, it provides a

complete solution to problems associated with

memory volatility and uses a common energy

source to maintain time and date. The SmartWatch

ROM sockets use the embedded lithium source to

maintain the time and date only. A key feature of

the SmartWatch is that the watch function remains

transparent to the RAM. The SmartWatch monitors

condition occurs, an internal lithium energy source

is automatically switched on and write protection

is unconditionally enabled to prevent loss of watch

and RAM data.

TYPICAL OPERATING CIRCUIT

www.maxim-ic.com

for an out-of-tolerance condition. When such a

1 of 14

SmartWatch RAM (DS1216B/C/D/H);

SmartWatch ROM (DS1216E/F)

FEATURES

ORDERING INFORMATION

(See Figure 2 for letter suffix marking identification.)

Selector Guide appears on page 2.

DS1216B

DS1216C

DS1216D

DS1216E

DS1216F

DS1216H

PART

Keeps Track of Hundredths of Seconds,

Seconds, Minutes, Hours, Days, Date of the

Month, Months, and Years

Converts Standard 2k x 8 Up to 512k x 8

CMOS Static RAMs into Nonvolatile Memory

Embedded Lithium Energy Cell Maintains

Watch Information and Retains RAM Data

Watch Function is Transparent to RAM

Operation

Month and Year Determine the Number of

Days in Each Month; Leap-Year

Compensation Valid Up to 2100

Lithium Energy Source is Electrically

Disconnected to Retain Freshness Until Power

is Applied for the First Time

Proven Gas-Tight Socket Contacts

Full ±10% Operating Range

Operating Temperature Range: 0°C to +70°C

Accuracy Better Than ±1 Minute/Month

at +25°C

TEMP RANGE

0°C to +70°C

28 SmartWatch Socket

32 SmartWatch Socket

28 SmartWatch Socket

32 SmartWatch Socket

PIN-PACKAGE

DS1216

REV: 031704

Related parts for DS1216B

DS1216B Summary of contents

Page 1

... TYPICAL OPERATING CIRCUIT Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata. SmartWatch RAM (DS1216B/C/D/H); SmartWatch ROM (DS1216E/F) FEATURES § ...

Page 2

... Conditioned Chip Enable, Active Low PIN CONFIGURATIONS TOP VIEW RST [A2 [A0] 10 DQ0 GND 14 DS1216B/C/E 28-Pin Intelligent Socket SELECTOR GUIDE PART RAM/ROM DS1216B RAM DS1216C RAM DS1216D RAM DS1216E ROM DS1216F ROM DS1216H RAM OE - Output Enable, Active Low WE - Write Enable, Active Low V - Switched Switched V ...

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