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

Infineon Technologies STK16C88-WF45I

Name: STK16C88-WF45I
Brand: Infineon Technologies
SKU: STK16C88-WF45I
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STK16C88-WF45I

Manufacturer:: Infineon Technologies

Category:: Memory

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

Datasheet:: STK16C88-WF45I.pdf

Description:: IC NVSRAM 256KBIT PARALLEL 28DIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STK16C88-WF45I from Cypress Semiconductor is a 256 Kbit (32K × 8) AutoStore+ nvSRAM with 45 ns access time, single 5V±10% supply, industrial temperature range (–40°C to +85°C), and integrated QuantumTrap nonvolatile storage. It performs automatic STORE on power loss and RECALL on power-up, replacing battery-backed SRAMs in mission-critical data logging and configuration retention systems.

For engineers reviewing the STK16C88-WF45I datasheet, STK16C88-WF45I pinout, STK16C88-WF45I application, or STK16C88-WF45I equivalent, key selection criteria include guaranteed 100-year data retention, 1,000,000 STORE cycles, software-controlled STORE/RECALL via six-address sequence, and hardware protection against low-voltage write corruption.

Technical Context

The STK16C88-WF45I integrates volatile SRAM and nonvolatile QuantumTrap cells per bit, enabling transparent, capacitor-assisted 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 using CE-controlled READ sequences at six fixed addresses.

Hardware protection disables STORE and WRITE when V_CAP < V_SWITCH, preventing corruption during brownout. The device uses standard SRAM timing interfaces (WE#, CE#, OE#) but adds dedicated internal logic for nonvolatile state management without external controllers or batteries.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Density	256 Kbit (32K × 8) - supports full byte-wide data buffers without address multiplexing
Access Time	45 ns - enables direct interface with legacy 8-bit microcontrollers running at ≤22 MHz
Data Retention	100 years - eliminates need for periodic refresh or backup power in unattended systems
STORE Cycles	1,000,000 - supports frequent power-cycle environments like utility meters and PLCs
Operating Voltage	4.5 V to 5.5 V - compatible with standard 5V TTL/CMOS logic rails without regulation
Temperature Range	–40°C to +85°C - qualified for industrial control and automotive under-hood auxiliary modules
Package	28-pin PDIP (600 mil) - through-hole mounting for high-reliability, serviceable designs

Pinout & Package

28-pin plastic dual in-line package (PDIP), 600 mil width, RoHS-compliant. Pin spacing and footprint conform to JEDEC MS-026AC.

Pin/Terminal	Circuit Role	Design Meaning
A0–A14	Address Input	15-bit address bus selects one of 32,768 bytes; no address multiplexing required
DQ0–DQ7	Bidirectional Data I/O	8-bit parallel data path; tristates when OE# HIGH or during STORE/RECALL
WE#	Write Enable (Active LOW)	Controls SRAM write initiation; held HIGH during software STORE/RECALL sequence
CE#	Chip Enable (Active LOW)	Enables memory access; used as clocking signal for six-address software mode entry
OE#	Output Enable (Active LOW)	Controls output buffer enable; must be HIGH during WRITE to avoid bus contention
VCC	Power Supply	5V ±10% input; powers SRAM core and internal STORE capacitor charging circuit
VSS	Ground	System reference ground; requires local 0.1 µF bypass capacitor per high-speed CMOS practice

Key Features

Feature	Design Value
AutoStore+ Power-Loss Protection	STORE completes autonomously within 500 ns of V_CC collapse-no host intervention or external capacitor timing
Software-Controlled STORE/RECALL	Initiated by six CE-controlled READs at fixed addresses (e.g., 0x0E38 → 0x0FC0); immune to accidental trigger
Hardware Write Protection	Disables WRITE and STORE when V_CAP < V_SWITCH, preventing data corruption during undervoltage conditions
Unlimited SRAM Endurance	True infinite read/write cycles to volatile array-no wear-out mechanism affects SRAM cell lifetime
QuantumTrap Nonvolatile Cell	Embedded per-bit storage eliminates external battery, capacitor, or EEPROM co-design complexity

Applications

Industrial Programmable Logic Controller (PLC)

Smart Electricity Meter

Use Scenario: Retaining real-time energy accumulation registers and tariff tables across daily power outages.

IC Role / Device Role / Timing Role: Nonvolatile SRAM providing atomic STORE/RECALL of metering state without battery maintenance.

Use Value: Guarantees billing integrity and regulatory compliance with 100-year data retention and 1M STORE cycles.

Use Scenario: Preserving firmware configuration, calibration constants, and tamper-event logs during grid instability.

IC Role / Device Role / Timing Role: Drop-in replacement for DS1230AB battery-SRAM, eliminating field battery replacement labor.

Use Value: Reduces lifecycle cost and improves long-term reliability in sealed, inaccessible meter housings.

Railway Signaling Control Unit

Medical Infusion Pump

Use Scenario: Storing safety-critical operational parameters and fault history across train depot power-down cycles.

IC Role / Device Role / Timing Role: Fail-safe memory holding EN 5012x-compliant event logs and configuration checksums.

Use Value: Meets SIL-2 requirements via deterministic STORE latency (<500 ns) and zero reliance on external power sources.

Use Scenario: Maintaining drug delivery profiles, dose limits, and alarm thresholds during AC power interruptions.

IC Role / Device Role / Timing Role: Critical data retention element ensuring continuity of therapy and patient safety compliance.

Use Value: Eliminates risk of therapy interruption or misconfiguration due to battery failure or leakage.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STK16C88-WF25I	25 ns access time; higher ICC1 (97 mA vs. 70 mA at tRC=45 ns); identical pinout and STORE/RECALL logic	Suitable where system timing budget allows faster access but increases average power draw	Select only if design requires sub-45 ns SRAM response and can accommodate higher active current
DS1248W-120+T&R	Battery-backed SRAM; requires external lithium battery and voltage monitoring; no software STORE/RECALL capability	Legacy designs already using Dallas battery-SRAM footprint; lacks AutoStore+ automation	Choose only for backward compatibility where existing board layout prohibits nvSRAM redesign

Compared with STK16C88-WF45I, the -WF25I variant trades lower access latency for higher active power, while DS1248W demands external battery management and offers no software-controlled nonvolatile operations-making STK16C88-WF45I the optimal choice for new designs prioritizing maintenance-free reliability and deterministic STORE timing.

Availability

STK16C88-WF45I is available at Aetrix Electronics and suitable for industrial programmable logic controllers, smart electricity meters, railway signaling units, and medical infusion pumps requiring stable component supply across extended product lifecycles.

Supply support for STK16C88-WF45I 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) is a fabless semiconductor company specializing in memory, PSoC, and USB solutions for industrial, automotive, and consumer markets.

The STK16C88 belongs to Cypress's AutoStore+ nvSRAM product line, engineered to replace battery-backed SRAM in applications demanding zero-maintenance, long-term data retention, and deterministic power-loss recovery.

FAQ

What triggers automatic STORE on the STK16C88-WF45I?

Automatic STORE initiates when V_CC drops below V_SWITCH (typically ~3.0 V), triggering an internal 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 writes during noise events.

Can STK16C88-WF45I be used in place of DS1230AB without hardware changes?

Yes-STK16C88-WF45I is a direct pin-compatible and functionally equivalent replacement for DS1230AB. It eliminates the external battery, requires no voltage-monitoring circuitry, and retains identical 28-pin PDIP footprint and address/data bus interface, enabling drop-in upgrade in legacy systems.

How does software STORE differ from hardware STORE in timing behavior?

Software STORE begins only after the sixth valid CE-controlled READ in the exact sequence (0x0E38 → 0x0FC0) and takes t_STORE ≈ 15 ms to complete, during which all I/O is disabled. Hardware STORE starts autonomously within 500 ns of V_CC collapse and completes before V_CC falls below operational threshold-no host timing dependency.

Is STK16C88-WF45I still recommended for new designs?

No-Cypress explicitly marks STK16C88 as "Not recommended for new designs." It remains in production solely to support ongoing programs. For new designs, Infineon recommends migrating to the newer Excelon™ family (e.g., CY14B108N) offering higher density, lower voltage, and enhanced reliability-but STK16C88-WF45I is fully supported for legacy continuity.

STK16C88-WF45I 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:: 45ns

Access Time:: 45 ns

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 28-PDIP

STK16C88-WF45I FAQ

1.How can I place an order for STK16C88-WF45I through Aetrix?

Please submit a Request for Quotation (RFQ) for STK16C88-WF45I 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-WF45I reliable?

The price and inventory of STK16C88-WF45I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK16C88-WF45I is usually 5 days.

3.What payment methods are accepted for STK16C88-WF45I?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK16C88-WF45I transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STK16C88-WF45I?

STK16C88-WF45I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STK16C88-WF45I 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-WF45I?

For technical support, including STK16C88-WF45I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK16C88-WF45I requirements.

6.How does Aetrix verify that STK16C88-WF45I is sourced from the original manufacturer or authorized distributors?

All STK16C88-WF45I 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-WF45I meets industry standards.

7.What is the process for return or replacement of STK16C88-WF45I?

All STK16C88-WF45I units undergo pre-shipment inspection (PSI). If there is an issue with STK16C88-WF45I, 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-WF45I part is unused and in its original packaging.

Return procedure for STK16C88-WF45I:

1.Submit a request within 90 days.

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

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