Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsIntegrated Circuits (ICs)1024 kBit 128 K x 8

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FEATURES

 10 years minimum data retention in the

absence of external power



Data is automatically protected during power

loss

 Power supply monitor resets processor when

power loss occurs and holds processor in

reset during V

ramp-up

 Battery monitor checks remaining capacity

daily

 Read and write access times of 70ns

 Unlimited write cycle endurance

 Typical standby current 50µA

 Upgrade for 128k x 8 SRAM, EEPROM or

Flash

 Lithium battery is electrically disconnected to

retain freshness until power is applied for the

first time

 Full ±10% V

operating range (DS1345Y)

or optional ±5% V

operating range

(DS1345AB)

 Optional industrial temperature range of

-40°C to +85°C, designated IND

 PowerCap Module (PCM) package

- Directly surface-mountable module

- Replaceable snap-on PowerCap provides

lithium backup battery

- Standardized pinout for all nonvolatile

(NV) SRAM products

- Detachment feature on PowerCap allows

easy removal using a regular screwdriver

PIN ASSIGNMENT

PIN DESCRIPTION

A0 – A16 - Address Inputs

DQ0 – DQ7 - Data In/Data Out

- Chip Enable

- Write Enable

- Output Enable

RST

- Reset Output

- Battery Warning Output

- Power (+5V)

GND - Ground

NC - No Connect

DESCRIPTION

The DS1345 1024k NV SRAMs are 1,048,576-bit, fully static, NV SRAMs organized as 131,072 words

by 8 bits. Each NV SRAM has a self-contained lithium energy source and control circuitry which

constantly monitors V

for an out-of-tolerance condition. When such a condition occurs, the lithium

energy source is automatically switched on and write protection is unconditionally enabled to prevent

data corruption. Additionally, the DS1345 devices have dedicated circuitry for monitoring the status of

and the status of the internal lithium battery. DS1345 devices in the PowerCap module package are

directly surface mountable and are normally paired with a DS9034PC PowerCap to form a complete NV

SRAM module. The devices can be used in place of 128k x 8 SRAM, EEPROM, or Flash components.

DS1345Y/AB

1024k Nonvolatile SRAM

with Battery Monitor

www.maxim-ic.com

A15

A16

RST

DQ7

DQ6

DQ5

DQ4

DQ3

DQ2

DQ1

DQ0

GND

A14

A13

A12

A11

A10

GND

BAT

34-Pin PowerCap Module (PCM)

(Uses DS9034PC+ or DS9034PCI+ PowerCap)

19-5589; Rev 10/10

Summary of content (10 pages)

PAGE 1
9-5589; Rev 10/10 DS1345Y/AB 1024k Nonvolatile SRAM with Battery Monitor www.maxim-ic.
PAGE 2
DS1345Y/AB READ MODE The DS1345 devices execute a read cycle whenever WE (Write Enable) is inactive (high) and CE (Chip Enable) and OE (Output Enable) are active (low). The unique address specified by the 17 address inputs (A0 – A16) defines which of the 131,072 bytes of data is to be accessed. Valid data will be available to the eight data output drivers within tACC (Access Time) after the last address input signal is stable, providing that CE and OE (Output Enable) access times are also satisfied.
PAGE 3
DS1345Y/AB PACKAGES The 34-pin PowerCap Module integrates SRAM memory and NV control along with contacts for connection to the lithium battery in the DS9034PC PowerCap. The PowerCap module package design allows a DS1345 PCM device to be surface mounted without subjecting its lithium backup battery to destructive high-temperature reflow soldering. After a DS1345 PCM is reflow soldered, a DS9034PC is snapped on top of the PCM to form a complete NV SRAM module.
PAGE 4
DS1345Y/AB ABSOLUTE MAXIMUM RATINGS Voltage on Any Pin Relative to Ground Operating Temperature Range Commercial: Industrial: Storage Temperature Range Lead Temperature (soldering, 10s) Soldering Temperature (reflow) -0.3V to +6.0V 0°C to +70°C -40°C to +85°C -55°C to +125°C +260°C +260°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
DS1345Y/AB AC ELECTRICAL CHARACTERISTICS (VCC = 5V ± 5% for DS1345AB) (TA: See Note 10) (VCC = 5V ± 10% for DS1345Y) PARAMETER SYMBOL DS1345AB-70 DS1345Y-70 MIN 70 UNITS MAX Read Cycle Time tRC Access Time tACC 70 ns OE to Output Valid tOE 35 ns CE to Output Valid tCO 70 ns OE or CE to Output Active tCOE Output High Z from Deselection tOD Output Hold from Address Change tOH 5 ns Write Cycle Time tWC 70 ns Write Pulse Width tWP 55 ns Address Setup Time tAW tWR1 tWR2 0 5
PAGE 6
DS1345Y/AB WRITE CYCLE 1 SEE NOTES 2, 3, 4, 6, 7, 8, and 12 WRITE CYCLE 2 SEE NOTES 2, 3, 4, 6, 7, 8, and 13 6 of 10
PAGE 7
DS1345Y/AB POWER-DOWN/POWER-UP CONDITION SEE SEE NOTES 11 AND 14 BATTERY WARNING DETECTION SEE NOTE 14 7 of 10
PAGE 8
DS1345Y/AB POWER-DOWN/POWER-UP TIMING PARAMETER SYMBOL VCC Fail Detect to CE and WE Inactive tPD VCC slew from VTP to 0V tF VCC Fail Detect to RST Active (TA: See Note 10) MIN TYP MAX UNITS NOTES 1.
PAGE 9
DS1345Y/AB 9. Each DS1345 has a built-in switch that disconnects the lithium source until the user first applies VCC. The expected tDR is defined as accumulative time in the absence of VCC starting from the time power is first applied by the user. This parameter is assured by component selection, process control, and design. It is not measured directly during production testing. 10. All AC and DC electrical characteristics are valid over the full operating temperature range.
PAGE 10
DS1345Y/AB REVISION HISTORY REVISION DESCRIPTION DATE Updated the storage, lead, and soldering information in the Absolute Maximum Ratings section, removed the unused AC timing specs in the AC Electrical Characteristics table, updated the Ordering 10/10 Information table, replaced the package outline drawing with the Package Information table 10 of 10 PAGES CHANGED 1, 4, 5, 9