DS1216F-3 Maxim Integrated, DS1216F-3 Datasheet

DS1216F-3

Manufacturer Part Number

DS1216F-3

Description

Memory Controllers

Manufacturer

Maxim Integrated

Datasheet

1.DS1216F-3.pdf (15 pages)

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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

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

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

1 of 15

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

Automatic 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

Accuracy Better Than ±1 Minute/Month

at +25°C

TEMP RANGE

0°C to +70°C

PIN-PACKAGE

28 SmartWatch Socket

32 SmartWatch Socket

28 SmartWatch Socket

32 SmartWatch Socket

DS1216

Related parts for DS1216F-3

DS1216F-3 Summary of contents

Page 1

... TEMP RANGE DS1216B 0°C to +70°C DS1216C 0°C to +70°C DS1216D 0°C to +70°C DS1216E 0°C to +70°C DS1216F 0°C to +70°C DS1216H 0°C to +70°C (See Figure 2 for letter suffix marking identification.) Selector Guide appears on page DS1216 PIN-PACKAGE ...

Page 2

... 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 - Output Enable, Active Low OE - Write Enable, Active Low Switched Switched Switched V CC ...

Page 3

DETAILED DESCRIPTION The DS1216 SmartWatch RAM and SmartWatch ROM Sockets are 600-mil-wide DIP sockets with a built-in CMOS watch function RAM controller circuit, and an embedded lithium energy source. The sockets provide an NV RAM solution for memory ...

Page 4

If a match is not found, the pointer does not advance and all subsequent write cycles are ignored read cycle occurs at any time during pattern recognition, the present sequence ...

Page 5

Figure 1. SmartWatch Comparison Register Definition 7 1 BYTE 0 0 BYTE 1 1 BYTE 2 0 BYTE 3 1 BYTE 4 0 BYTE 5 1 BYTE 6 0 BYTE 7 NOTE: THE PATTERN RECOGNITION IN HEX IS C5, 3A, ...

Page 6

SMARTWATCH REGISTER INFORMATION The SmartWatch information is contained in eight registers of 8 bits, each of which is sequentially accessed one bit at a time after the 64-bit pattern recognition sequence has been completed. When updating the SmartWatch registers, each ...

Page 7

Figure 2. Reset and Memory Density Options NOTE: THE LETTER SUFFIX OF THE SMARTWATCH IS LOCATED ON THE PC BOARD. The RST pin on the controller has an internal pullup resistor. To disable the RST function, the trace between pin ...

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Figure 3. SmartWatch Register Definition REGISTER 12/ 0.1 SEC 10 SEC 10 MIN OSC ...

Page 9

ABSOLUTE MAXIMUM RATINGS Voltage Range on any Pin Relative to Ground………………………………….…………-0.3V to +6.0V Operating Temperature Range…………………………………………………………..…...0°C to +70°C Storage Temperature Range…………………………………………………………..…...-40°C to +85°C Lead Temperature (soldering, 10s) ………................................................................................…...+260°C Note: Wave or hand-solder only. This is a stress rating only and ...

Page 10

CAPACITANCE (T = +25°C) A PARAMETER Input Capacitance Output Capacitance Expected Data Retention AC ELECTRICAL CHARACTERISTICS (V = 4.5V to 5.5V 0°C to +70°C PARAMETER Read Cycle Time CE Access Time OE Access Time CE to ...

Page 11

Timing Diagram: Read Cycle to SmartWatch Timing Diagram: Write Cycle to SmartWatch ...

Page 12

Timing Diagram: Reset for SmartWatch Timing Diagram: Power-Down CE (L (U) V (L) CC *Note 1 Timing Diagram: Power- (max ...

Page 13

WARNING: Under no circumstances should negative undershoots of any amplitude be allowed when the device is in battery-backup mode. Water washing for flux removal will discharge internal lithium source because exposed voltage pins are present. NOTES: 1) Pin locations are ...

Page 14

PACKAGE INFORMATION For the latest package outline information and land patterns (footprints www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the ...

Page 15

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