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The DS1245 1024k Nonvolatile (NV) SRAMs are 1,048,576-bit, fully static, nonvolatile SRAMs organized as 131,072 words by 8 bits. Each complete NV SRAM has a self-contained lithium energy source and control circuitry which constantly monitors VCC for an out-of-tolerance condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is nconditionally enabled to prevent data corruption. DIP-package DS1245 devices can be used in place of existing 128k x 8 static RAMs directly conforming to the popular bytewide 32-pin DIP standard. DS1245 devices in the PowerCap Module package are directly surface mountable and are normally paired with a DS9034PC PowerCap to form a complete Nonvolatile SRAM module. There is no limit on the number of write cycles that can be executed and no additional support circuitry is required for microprocessor interfacing.
Key Features
- 10 years minimum data retention in the absence of external power
- Data is automatically protected during power loss
- Replaces 128k x 8 volatile static RAM, EEPROM or Flash memory
- Unlimited write cycles
- Low-power CMOS
- Read and write access times of 70ns
- Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time
- Full ±10% VCC operating range (DS1245Y)
- Optional ±5% VCC operating range (DS1245AB)
- Optional industrial temperature range of -40°C to +85°C, designated IND
- JEDEC standard 32-pin DIP package
- PowerCap Module (PCM) package
- Directly surface-mountable module
- Replaceable snap-on PowerCap provides lithium backup battery
- Standardized pinout for all nonvolatile SRAM products
- Detachment feature on PowerCap allows easy removal using a regular screwdriver
Applications/Uses
Parametric specs for Memory (EPROM, EEPROM, ROM, NV SRAM)
| Memory Type | NV SRAM |
| Memory Size | 128K x 8 |
| Bus Type | Parallel |
| VSUPPLY (V) (min) | 4.75 |
| VSUPPLY (V) (max) | 5.25 |
| Package/Pins | MOD/32 PWRCP/34 |
| Budgetary Price (See Notes) | $19.98 @1k |
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Technical Docs
| Data Sheet | 1024k Nonvolatile SRAM | Nov 23, 2010 | |
| App Note | Lithium Battery Content in Maxim Products | ||
| App Note | Substitution Rules for Nonvolatile Memory Components | ||
| App Note | How to Replace a DS1213 SmartSocket with an Equivalent-Density NV SRAM Module | ||
| App Note | Low-Temperature Data Retention in Nonvolatile SRAM | ||
| App Note | NV SRAM Device Programmers | ||
| App Note | Timing Considerations When Using NVSRAM | ||
| App Note | Tech. Brief 39: NV SRAM Cross Reference Table | ||
| App Note | NV SRAM Frequently Asked Questions |
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Parameters
Parametric specs for Memory (EPROM, EEPROM, ROM, NV SRAM)
| Memory Type | NV SRAM |
| Memory Size | 128K x 8 |
| Bus Type | Parallel |
| VSUPPLY (V) (min) | 4.75 |
| VSUPPLY (V) (max) | 5.25 |
| Package/Pins | MOD/32 PWRCP/34 |
| Budgetary Price (See Notes) | $19.98 @1k |
Key Features
- 10 years minimum data retention in the absence of external power
- Data is automatically protected during power loss
- Replaces 128k x 8 volatile static RAM, EEPROM or Flash memory
- Unlimited write cycles
- Low-power CMOS
- Read and write access times of 70ns
- Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time
- Full ±10% VCC operating range (DS1245Y)
- Optional ±5% VCC operating range (DS1245AB)
- Optional industrial temperature range of -40°C to +85°C, designated IND
- JEDEC standard 32-pin DIP package
- PowerCap Module (PCM) package
- Directly surface-mountable module
- Replaceable snap-on PowerCap provides lithium backup battery
- Standardized pinout for all nonvolatile SRAM products
- Detachment feature on PowerCap allows easy removal using a regular screwdriver
Applications/Uses
Description
The DS1245 1024k Nonvolatile (NV) SRAMs are 1,048,576-bit, fully static, nonvolatile SRAMs organized as 131,072 words by 8 bits. Each complete NV SRAM has a self-contained lithium energy source and control circuitry which constantly monitors VCC for an out-of-tolerance condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is nconditionally enabled to prevent data corruption. DIP-package DS1245 devices can be used in place of existing 128k x 8 static RAMs directly conforming to the popular bytewide 32-pin DIP standard. DS1245 devices in the PowerCap Module package are directly surface mountable and are normally paired with a DS9034PC PowerCap to form a complete Nonvolatile SRAM module. There is no limit on the number of write cycles that can be executed and no additional support circuitry is required for microprocessor interfacing.
Technical Docs
| Data Sheet | 1024k Nonvolatile SRAM | Nov 23, 2010 | |
| App Note | Lithium Battery Content in Maxim Products | ||
| App Note | Substitution Rules for Nonvolatile Memory Components | ||
| App Note | How to Replace a DS1213 SmartSocket with an Equivalent-Density NV SRAM Module | ||
| App Note | Low-Temperature Data Retention in Nonvolatile SRAM | ||
| App Note | NV SRAM Device Programmers | ||
| App Note | Timing Considerations When Using NVSRAM | ||
| App Note | Tech. Brief 39: NV SRAM Cross Reference Table | ||
| App Note | NV SRAM Frequently Asked Questions |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal
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