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

Infineon Technologies STK16C88-WF25

Name: STK16C88-WF25
Brand: Infineon Technologies
SKU: STK16C88-WF25
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STK16C88-WF25

Manufacturer:: Infineon Technologies

Category:: Memory

Package:: 28-DIP (0.600", 15.24mm)

Datasheet:: STK16C88-WF25.pdf

Description:: IC NVSRAM 256KBIT PARALLEL 28DIP

Quantity:: RFQ Add To RFQ list

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Inventory:2,706

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Product details

Overview

STK16C88-WF25 from Cypress Semiconductor is a 256 Kbit (32K × 8) AutoStore+ nvSRAM with QuantumTrap nonvolatile cell technology, direct battery-backed SRAM replacement, 25 ns access time, single 5V ±10% supply, and 28-pin PDIP package. It performs automatic STORE on power loss and RECALL on power-up in industrial temperature range (–40°C to +85°C), used in real-time data logging systems where volatile memory persistence is critical without external batteries.

For engineers reviewing the STK16C88-WF25 datasheet, STK16C88-WF25 pinout, STK16C88-WF25 application, or STK16C88-WF25 equivalent, key selection criteria include guaranteed 1,000,000 STORE cycles, 100-year data retention, software-controlled STORE/RECALL via six-address CE-read sequence, and hardware protection against low-voltage write corruption.

Technical Context

The STK16C88-WF25 integrates SRAM and nonvolatile storage per cell using QuantumTrap technology, enabling transparent, capacitor-powered STORE within 500 ns of V_CC drop below V_SWITCH. Its dual-mode operation supports both hardware-triggered (power-loss/power-up) and software-initiated STORE/RECALL sequences using six specific CE-controlled read addresses.

Hardware protection disables STORE and WRITE when V_CAP < V_SWITCH, and noise immunity requires 0.1 µF V_CC-to-V_SS bypassing. The device operates across 4.5V–5.5V with TTL/CMOS-compatible inputs and tristate I/O controlled by OE and WE.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Density	256 Kbit (32K × 8), directly replaces DS1230AB in legacy 28-pin socket designs
Access Time	25 ns (t_AA), enables compatibility with high-speed 8-bit microcontroller buses
Data Retention	100 years at +85°C, eliminates need for battery maintenance in sealed industrial enclosures
STORE Cycles	1,000,000 minimum, supports frequent power-cycle environments like utility metering
Operating Voltage	4.5 V to 5.5 V, compatible with standard 5V logic rails without regulation overhead
Temperature Range	–40°C to +85°C (industrial), validated for deployment in uncontrolled ambient environments
Power Supply	Single 5V ±10%, removes requirement for auxiliary voltage rails or charge-pump circuitry

Pinout & Package

28-pin plastic dual in-line package (PDIP), 600 mil width, RoHS-compliant, through-hole mountable with standard 0.1" pitch footprint.

Pin/Terminal	Circuit Role	Design Meaning
A0–A14	Address Input	15-bit address bus selecting one of 32,768 bytes; latched on CE/WE transitions
DQ0–DQ7	Bidirectional Data I/O	8-bit common bus for read/write; tristated when OE = HIGH or during STORE/RECALL
WE	Write Enable (Active LOW)	Controls write initiation; must remain HIGH during software STORE/RECALL address sequence
CE	Chip Enable (Active LOW)	Enables device; CE-controlled READs trigger software STORE/RECALL when specific address sequence applied
OE	Output Enable (Active LOW)	Activates output drivers during reads; kept HIGH during writes to prevent bus contention
V_CC	Power Supply	5V ±10% input; powers SRAM core and internal capacitor charging circuit
V_SS	Ground	Reference return path; requires low-impedance connection to system ground plane

Key Features

Feature	Design Value
AutoStore+ Power-Loss Protection	Guaranteed STORE completion within 500 ns of V_CC collapse using internal capacitor, no external components required
Software-Controlled STORE/RECALL	Initiated via six exact-order CE-controlled READs to fixed addresses (e.g., 0x0E38 → 0x0FC0), enabling deterministic firmware control
Hardware Write Protection	Automatic inhibition of WRITE and STORE when V_CAP < V_SWITCH, preventing corruption during brown-out conditions
Unlimited SRAM Endurance	True infinite read/write cycles on SRAM array-no wear-out mechanism affecting volatile operation
QuantumTrap Nonvolatile Cell	Embedded per-cell storage eliminates interconnect failure modes seen in external battery + SRAM modules

Applications

Industrial Data Logger

Utility Smart Meter

Use Scenario: Continuous recording of sensor readings during mains power interruption.

IC Role / Device Role / Timing Role: Nonvolatile scratchpad memory preserving last valid measurement set before blackout.

Use Value: Eliminates supercapacitor or lithium backup, reducing BOM cost and field failure risk from battery leakage or end-of-life drift.

Use Scenario: Storing tariff tables, consumption registers, and tamper-event timestamps across daily power cycles.

IC Role / Device Role / Timing Role: High-reliability register bank retaining billing-critical data without clock-synchronized NVRAM writes.

Use Value: Guarantees 100-year retention at +85°C inside meter enclosures, meeting ANSI C12.1 and IEC 62053 compliance requirements.

Medical Diagnostic Device

Factory Automation PLC

Use Scenario: Capturing real-time ECG waveform buffers during emergency power switchover.

IC Role / Device Role / Timing Role: Fast-access buffer with sub-millisecond STORE latency ensuring zero-data-loss transition.

Use Value: Meets IEC 62304 Class C software safety requirements by removing single-point-of-failure battery dependency.

Use Scenario: Preserving motion-control parameters and fault history after unexpected line shutdown.

IC Role / Device Role / Timing Role: Deterministic RECALL at power-up ensures machine resumes from known safe state.

Use Value: Enables ISO 13849-1 PL e compliance via guaranteed parameter restoration without host CPU intervention.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STK16C88-WF45	45 ns access time vs. 25 ns; identical pinout, timing, and STORE/RECALL behavior	Suitable for lower-speed 8051 or legacy ISA bus systems where t_AA > 45 ns is acceptable	Select when system timing budget allows slower access and cost sensitivity outweighs speed requirement
DS1248W-120	Battery-backed SRAM with integrated lithium coin cell; no STORE cycle latency but finite battery life (~10 years)	Requires mechanical battery holder and periodic replacement; unsuitable for sealed or high-temperature deployments	Choose only if legacy board layout mandates DS12xx footprint and long-term maintenance is feasible

Compared with STK16C88-WF45, the WF25 offers 25 ns access for tighter timing margins in fast microcontroller interfaces; versus DS1248W-120, it removes battery lifetime uncertainty and thermal derating concerns while requiring no mechanical battery cavity.

Availability

STK16C88-WF25 is available at Aetrix Electronics and suitable for industrial data loggers, utility smart meters, medical diagnostic devices, and factory automation PLCs requiring stable component supply and long-term lifecycle support.

Supply support for STK16C88-WF25 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

Cypress Semiconductor, now part of Infineon Technologies, designs high-reliability memory and programmable solutions for industrial, automotive, and communications markets.

The STK16C88 belongs to Cypress's AutoStore+ nvSRAM product line, engineered to replace battery-backed SRAM in mission-critical systems where data integrity across uncontrolled power cycles is non-negotiable.

FAQ

What triggers automatic STORE on the STK16C88-WF25?

Automatic STORE initiates when V_CC drops below V_SWITCH (typically ~3.0 V), triggering capacitor-powered transfer from SRAM to QuantumTrap cells within 500 ns. The operation is inhibited unless at least one WRITE has occurred since the last STORE or RECALL, preventing spurious cycles during transient dips.

Can STK16C88-WF25 be used in new designs despite "Not recommended for new designs" status?

Yes - Cypress maintains active production to support ongoing programs, and the device remains available with full datasheet specifications, validated reliability data, and 100-year retention guarantees. Designers should confirm long-term supply via Aetrix's lifecycle coordination program before committing to high-volume production.

How does software STORE differ from hardware STORE in timing and control?

Software STORE uses a six-address CE-controlled READ sequence (0x0E38 → 0x0FC0) and executes regardless of recent WRITE activity, completing in t_STORE (max 20 ms). Hardware STORE activates automatically on V_CC collapse and completes within 500 ns using internal capacitor energy - no firmware involvement required.

Is the 28-pin PDIP package of STK16C88-WF25 RoHS-compliant?

Yes - the STK16C88-WF25 carries RoHS compliance certification per its datasheet (Rev. *B), with lead-free terminations and halogen-free molding compound. The 600-mil PDIP package meets JEDEC MS-011AC standards and supports wave-solder and hand-solder rework processes without exemption requests.

STK16C88-WF25 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 28-DIP (0.600", 15.24mm)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: NVSRAM

Technology:: NVSRAM (Non-Volatile SRAM)

Memory Size:: 256Kbit

Memory Organization:: 32K x 8

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 25ns

Access Time:: 25 ns

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 28-PDIP

STK16C88-WF25 FAQ

1.How can I place an order for STK16C88-WF25 through Aetrix?

Please submit a Request for Quotation (RFQ) for STK16C88-WF25 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 STK16C88-WF25 reliable?

The price and inventory of STK16C88-WF25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK16C88-WF25 is usually 5 days.

3.What payment methods are accepted for STK16C88-WF25?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK16C88-WF25 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STK16C88-WF25?

STK16C88-WF25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STK16C88-WF25 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 STK16C88-WF25?

For technical support, including STK16C88-WF25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK16C88-WF25 requirements.

6.How does Aetrix verify that STK16C88-WF25 is sourced from the original manufacturer or authorized distributors?

All STK16C88-WF25 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 STK16C88-WF25 meets industry standards.

7.What is the process for return or replacement of STK16C88-WF25?

All STK16C88-WF25 units undergo pre-shipment inspection (PSI). If there is an issue with STK16C88-WF25, 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 STK16C88-WF25 part is unused and in its original packaging.

Return procedure for STK16C88-WF25:

1.Submit a request within 90 days.

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

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