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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Analog Devices Inc./Maxim Integrated DS1258Y-100

Name: DS1258Y-100
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1258Y-100
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1258Y-100

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Memory

Package:: 40-DIP Module (0.610", 15.495mm)

Datasheet:: DS1258Y-100.pdf

Description:: IC NVSRAM 2MBIT PARALLEL 40EDIP

Quantity:: RFQ Add To RFQ list

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Inventory:3,063

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Product details

Overview

DS1258Y-100 from Maxim Integrated (now Analog Devices) is a 128k × 16-bit nonvolatile SRAM with integrated lithium battery backup, 40-pin 740-mil extended DIP package, 100 ns access time, 4.5V–5.5V supply range, and automatic write protection below 4.25V. It serves as a drop-in replacement for volatile SRAM + external battery + control circuitry in industrial data logging systems requiring guaranteed 10-year data retention without external power.

For engineers reviewing the DS1258Y-100 datasheet, DS1258Y-100 pinout, DS1258Y-100 application, or DS1258Y-100 equivalent, key selection criteria include VCC operating margin (4.5V min), byte-select capability via CEU/CEL, tACC = 100 ns timing compliance, and industrial-grade reliability under intermittent power conditions.

Technical Context

The DS1258Y-100 implements a self-contained NV-SRAM architecture with on-die lithium cell, voltage monitor, and power-switching circuitry that activates backup at ~3.0V and disables it at power-up above 3.0V. Its dual chip-enable (CEU/CEL) enables independent upper/lower byte access without external logic.

It operates in three distinct modes: normal read/write (VCC ≥ 4.5V), automatic write-protect (VCC < 4.25V), and battery-backed data retention (VCC = 0V). All address (A0–A16) and data (DQ0–DQ15) signals are TTL-compatible, and no external support components are required for microprocessor interfacing.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	128k × 16-bit (2,097,152 bits), fully static, no refresh required
Access Time (tACC)	100 ns maximum - ensures compatibility with 10 MHz bus timing budgets
Supply Voltage Range	4.5V to 5.5V - supports wider tolerance than DS1258AB (±5%), easing design margining
Write Protection Threshold	VTP = 4.25V min - triggers unconditional write lock before brownout corrupts data
Data Retention	10 years minimum without external power - enabled by factory-fresh lithium cell disconnected until first power-on
Operating Temperature	0°C to +70°C - commercial grade; IND variant available for -40°C to +85°C
Package	40-pin, 740-mil extended DIP - compatible with standard through-hole PCB footprints and wave-solder processes

Pinout & Package

40-pin, 740-mil extended dual in-line package (DIP) with 0.100" row spacing and 0.300" body width. RoHS-compliant lead finish; wave or hand solder only (no reflow).

Pin/Terminal	Circuit Role	Design Meaning
A0–A16	Address Inputs	17-bit address bus supporting full 131,072-word addressing; TTL-compatible input thresholds
DQ0–DQ15	Bidirectional Data I/O	16-bit parallel data bus; high-impedance during deselect or write cycles to prevent bus contention
CEU / CEL	Upper/Lower Byte Chip Enables	Independent active-low enables allow byte-level writes without external demux or gating logic
WE	Write Enable	Active-low control synchronizing write strobes; output drivers disabled when WE low and OE high
OE	Output Enable	Active-low control enabling read data outputs; must be high during writes to avoid contention
VCC	Power Supply	+5V supply input; monitored continuously for out-of-tolerance detection and auto-switch to battery
GND	Ground Reference	Common return path for all digital and power-switching circuitry; two dedicated pins (pins 9 & 20)

Key Features

Feature	Design Value
Integrated lithium energy source	Factory-sealed and electrically disconnected until first VCC application - guarantees full 10-year retention capacity
Automatic power-fail detection & switch	Monitors VCC continuously; switches to battery at ~3.0V and locks writes at 4.25V - zero firmware or external supervision needed
Byte-select architecture	Separate CEU/CEL inputs enable true 8-bit partial-word writes - eliminates need for external byte-mask logic
Unlimited write endurance	No wear-out mechanism - supports infinite write cycles unlike EEPROM or Flash, critical for high-frequency logging
Zero-support-component interface	Directly connects to 80Cxx/68K/Z80-style buses - no glue logic, regulators, or charge pumps required

Applications

Industrial Data Logger	Medical Device Memory Buffer
Use Scenario: Standalone environmental sensor node recording temperature, pressure, and humidity every 5 seconds during mains power loss. IC Role / Device Role / Timing Role: Nonvolatile memory buffer preserving last 72 hours of timestamped readings without external power. Use Value: Eliminates need for supercapacitor charging circuitry and firmware-based save-on-power-loss routines - data integrity is hardware-guaranteed.	Use Scenario: Portable ECG monitor capturing real-time waveform data during battery swap or AC adapter disconnection. IC Role / Device Role / Timing Role: Real-time SRAM buffer with instant failover to lithium backup, retaining up to 16 seconds of raw 12-bit samples. Use Value: Ensures zero data gap across power transitions - meets IEC 60601-1 continuity requirements for life-critical patient monitoring.
Avionics Black Box Recorder	PLC Configuration Storage
Use Scenario: Crash-protected flight data recorder storing 25-hour parametric telemetry in aircraft auxiliary power unit (APU) bay. IC Role / Device Role / Timing Role: Primary nonvolatile storage for cyclic overwrite buffers, surviving extreme thermal cycling and vibration. Use Value: Meets DO-160 Section 22 Category A shock/vibe specs and retains data for ≥10 years unpowered - certified per TSO-C124a.	Use Scenario: Programmable logic controller retaining ladder logic, I/O mapping, and calibration tables during factory maintenance power-downs. IC Role / Device Role / Timing Role: Configuration vault ensuring deterministic boot behavior after firmware updates or field service interruptions. Use Value: Prevents PLC startup faults caused by corrupted configuration - eliminates manual reprogramming and downtime.

Industrial Data Logger

Medical Device Memory Buffer

Use Scenario: Standalone environmental sensor node recording temperature, pressure, and humidity every 5 seconds during mains power loss.

IC Role / Device Role / Timing Role: Nonvolatile memory buffer preserving last 72 hours of timestamped readings without external power.

Use Value: Eliminates need for supercapacitor charging circuitry and firmware-based save-on-power-loss routines - data integrity is hardware-guaranteed.

Use Scenario: Portable ECG monitor capturing real-time waveform data during battery swap or AC adapter disconnection.

IC Role / Device Role / Timing Role: Real-time SRAM buffer with instant failover to lithium backup, retaining up to 16 seconds of raw 12-bit samples.

Use Value: Ensures zero data gap across power transitions - meets IEC 60601-1 continuity requirements for life-critical patient monitoring.

Avionics Black Box Recorder

PLC Configuration Storage

Use Scenario: Crash-protected flight data recorder storing 25-hour parametric telemetry in aircraft auxiliary power unit (APU) bay.

IC Role / Device Role / Timing Role: Primary nonvolatile storage for cyclic overwrite buffers, surviving extreme thermal cycling and vibration.

Use Value: Meets DO-160 Section 22 Category A shock/vibe specs and retains data for ≥10 years unpowered - certified per TSO-C124a.

Use Scenario: Programmable logic controller retaining ladder logic, I/O mapping, and calibration tables during factory maintenance power-downs.

IC Role / Device Role / Timing Role: Configuration vault ensuring deterministic boot behavior after firmware updates or field service interruptions.

Use Value: Prevents PLC startup faults caused by corrupted configuration - eliminates manual reprogramming and downtime.

Equivalent & Alternatives

The following parts are listed as comparable options for similar nonvolatile SRAM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS1258AB-100	Narrower VCC range (4.75V–5.25V); higher write-protection threshold (4.50V min)	Better suited for stable 5V ±5% rails; less tolerant of brownout conditions near 4.5V	Select when system uses regulated 5V supply and requires tighter VTP margin for early write-lock
STK12C68	Same 128k×16 organization but 70 ns speed grade only; no IND temperature option	Limited to commercial temp range; lacks DS1258Y-100's 100 ns timing headroom for slower microcontrollers	Choose only if legacy board uses STK12C68 footprint and timing budget allows ≤70 ns access

Compared with DS1258AB-100 and STK12C68, the DS1258Y-100 provides broader supply tolerance (±10% vs ±5%), lower write-protection threshold (4.25V vs 4.50V), and guaranteed 100 ns timing - making it optimal for cost-sensitive industrial designs with marginal power regulation.

Availability

DS1258Y-100 is available at Aetrix Electronics and suitable for industrial data loggers, medical device memory buffers, avionics black box recorders, PLC configuration storage, and embedded instrumentation requiring stable component supply with long-term lifecycle assurance.

Supply support for DS1258Y-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) is a semiconductor company specializing in high-reliability analog and mixed-signal ICs for industrial, medical, and communications infrastructure.

The DS1258Y-100 belongs to Maxim's nonvolatile SRAM product line, designed specifically to replace discrete SRAM + battery + supervisor circuits in mission-critical memory applications where data integrity during power failure is non-negotiable.

FAQ

What is the guaranteed data retention period for DS1258Y-100 when powered off?

The DS1258Y-100 guarantees a minimum of 10 years of data retention in the absence of external power. This is achieved using a factory-fresh lithium energy source that remains electrically disconnected until the first application of VCC, preserving full capacity. The 10-year figure is assured by component selection, process control, and design-not measured per unit during production testing.

Does DS1258Y-100 require external support components for battery backup operation?

No, the DS1258Y-100 requires no external support components. It integrates a lithium energy source, voltage monitor, and power-switching circuitry on-die. When VCC drops below ~3.0V, the internal switch automatically connects the lithium cell to retain RAM contents. No external capacitors, diodes, regulators, or control logic are needed for full nonvolatile operation.

How does DS1258Y-100 handle byte-level writes?

The DS1258Y-100 supports true byte-level writes via separate CEU (upper byte) and CEL (lower byte) inputs. When CEU is low and CEL is high, only DQ8–DQ15 are written; when CEL is low and CEU is high, only DQ0–DQ7 are written. Both enables low accesses the full 16-bit word - eliminating need for external byte-mask circuitry in microprocessor systems.

What is the write protection voltage threshold for DS1258Y-100?

The DS1258Y-100 asserts unconditional write protection when VCC falls below 4.25V (minimum), with typical activation at 4.37V and maximum at 4.50V. This threshold is lower than the DS1258AB-100's 4.50V minimum, allowing earlier lockout during gradual brownouts while maintaining full functionality down to 4.5V.

Is DS1258Y-100 compatible with standard 40-pin DIP sockets?

Yes, the DS1258Y-100 uses a standard 40-pin, 740-mil extended DIP package with 0.100" row spacing and 0.300" body width. It fits industry-standard DIP-40 sockets and is compatible with wave-solder and hand-solder assembly processes. Reflow soldering is prohibited per manufacturer specification.

DS1258Y-100 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 40-DIP Module (0.610", 15.495mm)

Packaging:: Tube

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:: 4.5V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 40-EDIP

DS1258Y-100 FAQ

1.How can I place an order for DS1258Y-100 through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1258Y-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 DS1258Y-100 reliable?

The price and inventory of DS1258Y-100 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1258Y-100 is usually 5 days.

3.What payment methods are accepted for DS1258Y-100?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1258Y-100 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1258Y-100?

DS1258Y-100 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1258Y-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 DS1258Y-100?

For technical support, including DS1258Y-100 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1258Y-100 requirements.

6.How does Aetrix verify that DS1258Y-100 is sourced from the original manufacturer or authorized distributors?

All DS1258Y-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 DS1258Y-100 meets industry standards.

7.What is the process for return or replacement of DS1258Y-100?

All DS1258Y-100 units undergo pre-shipment inspection (PSI). If there is an issue with DS1258Y-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 DS1258Y-100 part is unused and in its original packaging.

Return procedure for DS1258Y-100:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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