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Analog Devices Inc./Maxim Integrated DS1258AB-100#
- Part No.:
- DS1258AB-100#
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- 40-DIP Module (0.610", 15.495mm)
- Datasheet:
-
DS1258AB-100#.pdf
- Description:
- IC NVSRAM 2MBIT PARALLEL 40EDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,711
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Product details
Overview
DS1258AB-100# from Maxim Integrated (now Analog Devices) is a 128k × 16-bit nonvolatile SRAM with integrated lithium backup, 40-pin 740-mil extended DIP package, 100ns access time, 5V ±5% supply, and industrial-grade write protection at 4.5V. It serves as a drop-in NV memory replacement in legacy industrial controllers requiring data retention during power loss.
For engineers reviewing the DS1258AB-100# datasheet, DS1258AB-100# pinout, DS1258AB-100# application, or DS1258AB-100# equivalent, key selection criteria include VCC write-protection threshold (4.5V), byte-selectable CEU/CEL control, 10-year data retention without external support, and compatibility with 17-bit address buses in microprocessor-based systems.
Technical Context
The DS1258AB-100# implements autonomous power-fail detection via continuous VCC monitoring, triggering automatic lithium switchover below ~3.0V and unconditional write protection at ≤4.5V. Its dual chip-enable architecture (CEU/CEL) enables independent upper/lower byte access without external logic.
It operates as a fully static parallel interface device with no refresh required, supporting standard microprocessor bus timing - including tACC = 100ns, tRC = 100ns, and tWR = 5–15ns recovery - while maintaining high-impedance outputs during power transitions per U.L.-recognized safety design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 131,072 × 16-bit (128k × 16), enabling direct 16-bit data bus interfacing |
| Access Time (tACC) | 100ns max - defines minimum read/write cycle duration for 5MHz bus operation |
| VCC Operating Range | 4.75V to 5.25V - ensures compatibility with tight-tolerance 5V logic rails |
| Write Protection Threshold | 4.50V to 4.75V - triggers automatic data lock before brownout corrupts writes |
| Data Retention | 10 years minimum without external power - guaranteed by sealed lithium cell and freshness seal |
| Temperature Range | 0°C to +70°C - validated commercial-grade operation with no derating |
| Package | 40-pin, 740-mil extended DIP - supports through-hole mounting and legacy socket compatibility |
Pinout & Package
DS1258AB-100# uses a 40-pin, 740-mil extended dual in-line package (DIP) with 0.100" row spacing and 2.080–2.100" length. Pin 1 is marked with a notch or dot; pins are arranged in two parallel rows of 20.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 131,072-word addressing |
| DQ0–DQ15 | Data I/O | Bidirectional 16-bit data bus; high-impedance when deselected or in battery mode |
| CEU / CEL | Byte Select Enables | Independent upper (DQ8–DQ15) and lower (DQ0–DQ7) byte activation |
| WE | Write Enable | Active-low control; disables outputs during write if OE is active |
| OE | Output Enable | Active-low; must be high during writes to prevent bus contention |
| VCC / GND | Power / Ground | Single 5V supply; internal voltage monitor and lithium switch depend on VCC stability |
Key Features
| Feature | Design Value |
|---|---|
| Integrated lithium backup | Electrically disconnected until first VCC application - preserves full 10-year capacity |
| Automatic write protection | Unconditional lockout triggered at VCC ≤4.5V - prevents corruption during brownout |
| Byte-selectable access | CEU/CEL independence eliminates need for external byte-mask logic or glue logic |
| Zero-refresh static RAM | No external refresh circuitry or timing constraints - simplifies microprocessor interface |
| U.L.-recognized module | Complies with UL File E99151 - certified for use in safety-critical industrial equipment |
Applications
| Industrial PLC Data Logging | Medical Device Configuration Storage |
|---|---|
Use Scenario: Storing runtime parameters and alarm history in programmable logic controllers during scheduled maintenance outages. IC Role / Device Role / Timing Role: Nonvolatile memory buffer retaining critical state data across uncontrolled AC power cycles. Use Value: Eliminates need for external battery + SRAM + controller IC stack - reduces BOM count and failure points. | Use Scenario: Preserving calibration coefficients and user preferences in portable diagnostic instruments between clinical sessions. IC Role / Device Role / Timing Role: Self-contained NV SRAM ensuring FDA-required parameter integrity without host intervention. Use Value: Guarantees 10-year retention without periodic recharging or firmware-level backup routines. |
| Avionics Power-Up Sequence Memory | Legacy Telecom Shelf Management |
Use Scenario: Holding boot configuration and fault flags in airborne flight control units where power interruptions occur during ground handling. IC Role / Device Role / Timing Role: Fail-safe memory element activated only during VCC presence - immune to transient glitches. Use Value: Meets DO-254 deterministic power-loss response requirements without external supervision. | Use Scenario: Maintaining shelf identity, port mapping, and firmware version in telecom line cards undergoing hot-swap events. IC Role / Device Role / Timing Role: Parallel-access NV storage synchronized to backplane address/data strobes. Use Value: Supports byte-select reads/writes matching legacy 8-bit peripheral interfaces without glue logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1258Y-100# | Wider VCC range (4.5–5.5V); lower write-protection threshold (4.25V) | Suitable for systems with looser 5V regulation or wider input transients | Select DS1258Y-100# only if board-level VCC tolerance exceeds ±5% or brownout behavior requires earlier lockout |
| STK12C68-E100 | Same 128k×16 organization, 100ns speed, but uses external capacitor-based backup and lacks integrated lithium | Requires external 3.3V or 5V backup source and charge management circuitry | Choose STK12C68-E100 only when lithium-free design is mandated or cost sensitivity outweighs reliability trade-offs |
Compared with DS1258Y-100# and STK12C68-E100, the DS1258AB-100# provides tighter VCC regulation assurance (±5%), higher write-protection voltage (4.5V), and true zero-maintenance lithium integration - making it optimal for fixed 5V systems where deterministic brownout response is critical.
Availability
DS1258AB-100# is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, avionics subsystems, and telecom shelf controllers requiring stable component supply and long-term obsolescence resilience.
Supply support for DS1258AB-100# includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (acquired by Analog Devices in 2021) designs precision analog, mixed-signal, and nonvolatile memory solutions for industrial, medical, and communications markets.
The DS1258AB-100# belongs to Maxim's legacy nonvolatile SRAM product line, engineered specifically for drop-in replacement of volatile SRAM + battery + controller stacks in mission-critical embedded systems.
FAQ
What is the guaranteed data retention period for DS1258AB-100#?
The DS1258AB-100# guarantees a minimum 10-year data retention period in the absence of external power, measured from the time VCC is first applied. This is ensured by an electrically disconnected lithium energy source that remains fresh until initial power-up, and by process-controlled cell design validated per Note 9 in the datasheet.
Does DS1258AB-100# require external support circuitry for microprocessor interfacing?
No, the DS1258AB-100# requires no external support circuitry for microprocessor interfacing. It features fully static operation, built-in power-fail detection, automatic lithium switchover, and unconditional write protection - all implemented internally. The DS1258AB-100# connects directly to standard 16-bit address/data buses with only CEU, CEL, WE, and OE controls needed.
What is the function of CEU and CEL pins on DS1258AB-100#?
The CEU (Chip Enable Upper) and CEL (Chip Enable Lower) pins on DS1258AB-100# provide independent byte-select control: CEU enables access to DQ8–DQ15 (upper byte), CEL enables DQ0–DQ7 (lower byte), and asserting both enables full 16-bit word access. This eliminates external byte masking logic and supports mixed 8-bit/16-bit system architectures.
Is DS1258AB-100# RoHS-compliant?
Yes, DS1258AB-100# is RoHS-compliant, as indicated by the trailing "#" in the part number per Maxim's ordering information table. It meets EU Directive 2011/65/EU requirements for restricted hazardous substances, including lead-free terminations and compliant packaging materials.
What happens to DS1258AB-100# outputs during power-down?
During power-down, when VCC falls below ~3.0V, the DS1258AB-100# automatically switches to lithium backup, places all inputs in "don't care" state, and drives all DQ lines to high-impedance. This prevents bus contention and ensures safe coexistence with other devices on shared data buses - a behavior confirmed in the DATA RETENTION MODE section.
DS1258AB-100# Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 40-DIP Module (0.610", 15.495mm)
- Packaging:
- Box
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- NVSRAM
- Technology:
- NVSRAM (Non-Volatile SRAM)
- Memory Size:
- 2Mbit
- Memory Organization:
- 128K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 100ns
- Access Time:
- 100 ns
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-EDIP
DS1258AB-100# FAQ
1.How can I place an order for DS1258AB-100# through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1258AB-100# on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DS1258AB-100# reliable?
The price and inventory of DS1258AB-100# are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1258AB-100# is usually 5 days.
3.What payment methods are accepted for DS1258AB-100#?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1258AB-100# transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1258AB-100#?
DS1258AB-100# orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1258AB-100# order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DS1258AB-100#?
For technical support, including DS1258AB-100# datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1258AB-100# requirements.
6.How does Aetrix verify that DS1258AB-100# is sourced from the original manufacturer or authorized distributors?
All DS1258AB-100# products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS1258AB-100# meets industry standards.
7.What is the process for return or replacement of DS1258AB-100#?
All DS1258AB-100# units undergo pre-shipment inspection (PSI). If there is an issue with DS1258AB-100#, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DS1258AB-100# part is unused and in its original packaging.
Return procedure for DS1258AB-100#:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS1258AB-100# Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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Microchip Technology
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M24C02-FMC6TG
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Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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