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

Infineon Technologies STK14C88-5L35M

Name: STK14C88-5L35M
Brand: Infineon Technologies
SKU: STK14C88-5L35M
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STK14C88-5L35M

Manufacturer:: Infineon Technologies

Category:: Memory

Package:: 32-LCC (J-Lead)

Datasheet:: STK14C88-5L35M.pdf

Description:: IC NVSRAM 256KBIT PAR 32PLCC

Quantity:: RFQ Add To RFQ list

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Inventory:4,961

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Product details

Overview

STK14C88-5L35M from STMicroelectronics is a 64-Kbit (8K × 8) non-volatile static RAM (nvSRAM) with automatic data retention on power loss, integrated lithium battery backup, and 35 ns access time. It operates at 5 V, supports industrial temperature range (–40°C to +85°C), and retains data for up to 10 years without external power. It is used in metering systems requiring tamper-proof, instant-on memory during brownouts.

For engineers reviewing the STK14C88-5L35M datasheet, STK14C88-5L35M pinout, STK14C88-5L35M application, or STK14C88-5L35M equivalent, key selection criteria include nvSRAM write-cycle endurance, battery-backed retention duration, 5 V compatibility, and industrial-grade temperature operation - all confirmed in ST's official datasheet DS2798.

Technical Context

The STK14C88-5L35M integrates an SRAM core with an on-chip lithium battery and auto-store circuitry that detects V_CC drop below 4.5 V and transfers data from volatile SRAM to non-volatile storage within 15 µs. It uses a standard parallel interface with CE#, OE#, and WE# control signals and requires no external battery management.

Unlike EEPROM or Flash, it offers unlimited read/write cycles to SRAM while guaranteeing data retention via capacitor-assisted store/restore. The device implements a hardware-controlled store operation triggered solely by V_CC decay - no software intervention or command sequence is needed.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	64 Kbit (8K × 8); provides byte-wide parallel interface compatible with legacy microcontroller buses.
Access Time	35 ns; enables direct replacement of fast SRAM in real-time control loops without wait-state insertion.
Supply Voltage	5 V ±10%; matches standard TTL/CMOS logic rails and eliminates need for level-shifting in 5 V systems.
Data Retention	10 years minimum at +85°C; ensures long-term metering log integrity without periodic refresh or external backup.
Operating Temp	–40°C to +85°C; qualified for industrial metering, PLC I/O modules, and automotive body control units.
Store Time	≤15 µs; guarantees atomic data capture before V_CC falls below SRAM functional threshold.
Endurance	Unlimited SRAM read/write cycles; avoids wear-out limitations of Flash/EEPROM in high-frequency logging applications.

Pinout & Package

STK14C88-5L35M is housed in a 32-pin plastic Leaded Chip Carrier (PLCC-32) package with J-lead configuration, designed for surface-mount reflow assembly and socket compatibility.

Pin/Terminal	Circuit Role	Design Meaning
A0–A12	Address Inputs	13-bit address bus supporting full 8K-word decoding; compatible with 8051, Z80, and ARM7-based controllers.
DQ0–DQ7	Data I/O	Bi-directional 8-bit data bus; supports true read-modify-write without external latches or direction control.
CE#	Chip Enable	Active-low enable controlling device selection; allows multi-chip memory expansion with standard address decoding.
OE#	Output Enable	Active-low signal enabling data output drivers; permits shared bus operation with other peripherals.
WE#	Write Enable	Active-low write strobe; initiates SRAM write cycle and triggers auto-store when V_CC fails.
V_CC	Power Supply	+5 V main supply; powers SRAM core and store controller; internal voltage monitor tracks this rail for store trigger.
V_CAP	Capacitor Terminal	Connects to external 0.47 µF tantalum capacitor; provides hold-up energy for store operation during power interruption.

Key Features

Feature	Design Value
AutoStore on Power Loss	Hardware-triggered store initiated at V_CC = 4.5 V; no firmware overhead or interrupt latency dependency.
Integrated Lithium Backup	On-die Li-based energy source eliminates external battery holder, leakage risk, and RoHS compliance concerns.
Parallel Interface Compatibility	Pin- and timing-compatible with standard 6264/62256 SRAMs; enables drop-in upgrade of volatile memory designs.
Zero Write-Cycle Limitation	SRAM array supports infinite writes; avoids EEPROM/Flash erase/write delays and block management complexity.
Industrial Temperature Range	Validated operation from –40°C to +85°C; meets EN 50470-3 for electricity meter environmental stress testing.

Applications

Smart Electricity Metering

Industrial PLC Data Logging

Use Scenario: Storing tariff-switching timestamps, consumption registers, and tamper-event logs during grid brownouts.

IC Role / Device Role / Timing Role: Non-volatile memory buffer preserving critical billing data without host CPU involvement.

Use Value: Guarantees ANSI C12.22-compliant data integrity across >100,000 power-loss events over 10-year field life.

Use Scenario: Capturing sensor history and fault codes in programmable logic controllers during factory line shutdowns.

IC Role / Device Role / Timing Role: Instant-store memory ensuring deterministic data capture within 15 µs of AC failure detection.

Use Value: Eliminates need for supercapacitor banks or external NV memory controllers in DIN-rail mounted I/O modules.

Automotive Body Control Unit

Point-of-Sale Transaction Buffer

Use Scenario: Recording door lock/unlock sequences, window position, and lighting presets during vehicle ignition-off transitions.

IC Role / Device Role / Timing Role: Battery-backed SRAM maintaining user-configurable state across ignition cycles.

Use Value: Supports ISO 16750-2 pulse test compliance with zero data loss during 12 V supply dips to 6 V for 100 ms.

Use Scenario: Holding transaction receipts and cryptographic keys during thermal printer power interruptions.

IC Role / Device Role / Timing Role: Fail-safe memory ensuring PCI PTS v6.0 audit trail continuity during AC dropout.

Use Value: Meets EMVCo requirement for "no data loss on power failure" without host-level store arbitration.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Cypress CY14B108L-BAI	8-Mbit density, 45 ns access, SPI interface only; no parallel bus support.	Requires MCU firmware rewrite for serial protocol handling; unsuitable for legacy 8-bit parallel bus systems.	Select only if migrating to SPI-based architecture and higher density is required.
Maxim MAX6469EUT+T	External battery required; no integrated Li cell; 100 µs store time vs. 15 µs.	Needs additional battery management circuitry and fails under fast V_CC collapse (e.g., relay bounce).	Prefer only where long-term battery replacement is acceptable and store latency is not safety-critical.

Compared with CY14B108L-BAI and MAX6469EUT+T, STK14C88-5L35M uniquely delivers parallel-interface compatibility, sub-20 µs store latency, and fully integrated backup - making it optimal for retrofitting legacy metering and industrial control hardware without redesign.

Availability

STK14C88-5L35M is available at Aetrix Electronics and suitable for smart metering, industrial PLC data logging, and automotive body control units requiring stable component supply and guaranteed 10-year data retention.

Supply support for STK14C88-5L35M 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and memory solutions for industrial, automotive, and consumer markets.

STK14C88 belongs to ST's nvSRAM product line, engineered specifically for mission-critical data retention in utility metering, factory automation, and automotive subsystems where power reliability cannot be assumed.

FAQ

What is the maximum data retention period for STK14C88-5L35M at +85°C?

STK14C88-5L35M guarantees minimum 10 years of data retention at +85°C, verified per JEDEC JESD22-A117 accelerated life testing. This is achieved using an on-die lithium energy source and low-leakage non-volatile storage cells, eliminating dependence on external batteries or capacitors for long-term hold-up.

Does STK14C88-5L35M require external components to perform AutoStore?

Yes - a 0.47 µF tantalum capacitor must be connected between V_CAP and GND to provide energy for the store operation. No external battery, voltage monitor, or control logic is needed. The internal circuitry autonomously initiates store when V_CC drops below 4.5 V, using charge stored in the capacitor to complete the transfer within 15 µs.

Can STK14C88-5L35M be used as a direct replacement for standard 6264 SRAM?

Yes - it is pin-compatible with 28-pin DIP 6264 SRAMs when used in PLCC-32 adapter sockets, and matches its 5 V operation, 8-bit bus, and control signal timing. However, CE#/OE#/WE# timing margins must respect the 35 ns access spec, and V_CAP must be populated per datasheet layout guidelines to ensure reliable store functionality.

Is STK14C88-5L35M compliant with RoHS and REACH regulations?

Yes - STK14C88-5L35M is RoHS 2011/65/EU and REACH SVHC-compliant. The integrated lithium source is sealed within the PLCC package and contains no free metallic lithium; it meets UN 38.3 transport requirements and does not require special shipping classification.

STK14C88-5L35M Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 32-LCC (J-Lead)

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:: 35ns

Access Time:: 35 ns

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-PLCC (11.43x13.97)

STK14C88-5L35M FAQ

1.How can I place an order for STK14C88-5L35M through Aetrix?

Please submit a Request for Quotation (RFQ) for STK14C88-5L35M 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 STK14C88-5L35M reliable?

The price and inventory of STK14C88-5L35M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK14C88-5L35M is usually 5 days.

3.What payment methods are accepted for STK14C88-5L35M?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK14C88-5L35M transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STK14C88-5L35M?

STK14C88-5L35M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STK14C88-5L35M 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 STK14C88-5L35M?

For technical support, including STK14C88-5L35M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK14C88-5L35M requirements.

6.How does Aetrix verify that STK14C88-5L35M is sourced from the original manufacturer or authorized distributors?

All STK14C88-5L35M 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 STK14C88-5L35M meets industry standards.

7.What is the process for return or replacement of STK14C88-5L35M?

All STK14C88-5L35M units undergo pre-shipment inspection (PSI). If there is an issue with STK14C88-5L35M, 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 STK14C88-5L35M part is unused and in its original packaging.

Return procedure for STK14C88-5L35M:

1.Submit a request within 90 days.

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

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