Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsDS1210SN+

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FEATURES

 Converts CMOS RAMs into Nonvolatile

Memories

 Unconditionally Write Protects when V

Out-of-Tolerance

 Automatically Switches to Battery when

Power-Fail Occurs

 Space-Saving 8-Pin PDIP or 16-Pin SO

Packages

 Consumes <100nA of Battery Current

 Tests Battery Condition on Power up

 Provides for Redundant Batteries

 Optional 5% or 10% Power-Fail Detection

 Low Forward Voltage Drop on the V

Switch

 Optional Industrial (N) Temperature Range of

-40°C to +85°C

PIN ASSIGNMENT

PIN DESCRIPTION

CCO

- RAM Supply

BAT1

- + Battery 1

TOL - Power Supply Tolerance

GND - Ground

- Chip Enable Input

CEO

- Chip Enable Output

BAT2

- + Battery 2

CCI

- + Supply

NC - No Connect

DESCRIPTION

The DS1210 Nonvolatile Controller Chip is a CMOS circuit which solves the application problem of

converting CMOS RAM into nonvolatile memory. Incoming power is monitored for an out-of-tolerance

condition. When such a condition is detected, chip enable is inhibited to accomplish write protection and

the battery is switched on to supply the RAM with uninterrupted power. Special circuitry uses a low-

leakage CMOS process which affords precise voltage detection at extremely low battery consumption.

The 8-pin DIP package keeps PC board real estate requirements to a minimum. By combining the

DS1210 Nonvolatile Controller Chip with a CMOS memory and batteries, nonvolatile RAM operation

can be achieved.

DS1210

Nonvolatile Controller Chip

VCCO

VBAT1

TOL

GND

VCCI

VBAT2

CEO

DS1210 8-pin PDIP (300 mils)

VCCO

VBAT1

TOL

GND

VCCI

VBAT2

CEO

DS1210S 16-pin SO (300 mils)

19-6294; Rev 6/12

Summary of content (8 pages)

PAGE 1
9-6294; Rev 6/12 DS1210 Nonvolatile Controller Chip FEATURES           PIN ASSIGNMENT Converts CMOS RAMs into Nonvolatile Memories Unconditionally Write Protects when VCC is Out-of-Tolerance Automatically Switches to Battery when Power-Fail Occurs Space-Saving 8-Pin PDIP or 16-Pin SO Packages Consumes <100nA of Battery Current Tests Battery Condition on Power up Provides for Redundant Batteries Optional 5% or 10% Power-Fail Detection Low Forward Voltage Drop on the VCC Switch Optional Industri
PAGE 2
DS1210 OPERATION The DS1210 nonvolatile controller performs five circuit functions required to battery back up a RAM. First, a switch is provided to direct power from the battery or the incoming supply (VCCI) depending on which is greater. This switch has a voltage drop of less than 0.3V. The second function which the nonvolatile controller provides is power-fail detection. The DS1210 constantly monitors the incoming supply.
PAGE 3
SECTION A - BATTERY BACKUP Figure 1 BATTERY BACKUP CURRENT DRAIN EXAMPLE CONSUMPTION DS1210 IBAT RAM ICC02 Total Drain 100 nA 10 µA 10.
PAGE 4
DS1210 ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground Operating Temperature Range Storage Temperature Range Soldering Temperature (reflow, SO) Lead Temperature (soldering, 10s) -0.3V to +7.0V 0°C to +70°C, -40°C to +85°C for N parts -55°C to +125°C +260°C +300°C This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied.
PAGE 5
DS1210 CAPACITANCE PARAMETER Input Capacitance Output Capacitance SYMBOL CIN COUT MIN AC ELECTRICAL CHARACTERISTICS PARAMETER CE Propagation Delay CE High to Power-Fail SYMBOL tPD tPF MAX 5 7 2B (Note 10; VCCI = 4.75V to 5.5V, TOL = GND) (VCCI = 4.5V to 5.
PAGE 6
DS1210 TIMING DIAGRAM: POWER-UP TIMING DIAGRAM: POWER-DOWN OUTPUT LOAD Figure 2 6 of 8
PAGE 7
DS1210 ORDERING INFORMATION PART DS1210+ DS1210N+ DS1210S+ DS1210SN+ TEMP RANGE 0°C to +70°C -40°C to +85°C 0°C to +70°C -40°C to +85°C PINPACKAGE 8 PDIP 8 PDIP 16 SO 16 SO +Denotes a lead(Pb)-free/RoHS-compliant package. PACKAGE INFORMATION For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only.
PAGE 8
DS1210 REVISION HISTORY REVISION DATE DESCRIPTION PAGES CHANGED 6/12 Added lead temperature and soldering temperature information to the Absolute Maximum Ratings section; changed “Pin 3” to “TOL” in multiple places; added the Package Thermal Characteristics section; added the Ordering Information and Package Information sections 1, 2, 4, 5, 8 8 of 8 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product.