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

Infineon Technologies STK11C68-C45I

Name: STK11C68-C45I
Brand: Infineon Technologies
SKU: STK11C68-C45I
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STK11C68-C45I

Manufacturer:: Infineon Technologies

Category:: Memory

Package:: 28-CDIP (0.300", 7.62mm)

Datasheet:: STK11C68-C45I.pdf

Description:: IC NVSRAM 64KBIT PARALLEL 28CDIP

Quantity:: RFQ Add To RFQ list

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Inventory:4,185

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Product details

Overview

STK11C68-C45I from STMicroelectronics is a non-volatile static RAM (nvSRAM) with 8-Kbit capacity, 45 ns access time, and built-in lithium battery backup for data retention during power loss. It functions as a drop-in replacement for standard SRAM in mission-critical industrial control and telecom infrastructure where data integrity must survive unexpected shutdowns.

For engineers reviewing the STK11C68-C45I datasheet, STK11C68-C45I pinout, STK11C68-C45I application, or STK11C68-C45I equivalent, key selection criteria include guaranteed 10-year data retention at +70°C, automatic STORE/RECALL on power transition, and compatibility with 5 V TTL logic levels without external circuitry.

Technical Context

The STK11C68-C45I integrates a 8-Kbit SRAM array with an on-chip lithium battery and control logic to autonomously store data to internal EEPROM upon power failure. Its STORE operation triggers when V_CC drops below 3.0 V, and RECALL restores data on power-up within 45 ns.

This nvSRAM uses a single 5 V supply and requires no external write-enable signals or software intervention for non-volatile operations. It supports byte-wide parallel access and maintains full SRAM timing behavior during normal operation while providing EEPROM-level persistence only when needed.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	8 Kbit (1K × 8), directly replaces standard 1K×8 SRAM without address decoding changes
Access time	45 ns - ensures compatibility with legacy 5 V microcontrollers and ASICs requiring ≤50 ns SRAM timing
Data retention	10 years at +70°C - eliminates need for external battery management or periodic refresh in sealed systems
Supply voltage	5 V ±10% - operates natively in legacy 5 V industrial bus environments without level-shifting
STORE/RECALL trigger	V_CC < 3.0 V - fully autonomous hardware-based non-volatility, no firmware or external supervisor required
Write endurance	100,000 STORE cycles - sufficient for infrequent power-loss events in control loggers and configuration storage

Pinout & Package

STK11C68-C45I is housed in a 28-pin plastic DIP (Dual In-line Package) with 0.6-inch body width and 0.1-inch pin pitch, compatible with standard through-hole PCB assembly and socketing.

Pin/Terminal	Circuit Role	Design Meaning
A0–A9	Address inputs	10-bit address bus supporting full 1K-word addressing; TTL-compatible input thresholds
I/O0–I/O7	Bi-directional data bus	8-bit parallel interface; high-impedance state during STORE/RECALL to prevent bus contention
CE#	Chip enable	Active-low; enables memory access only when low and WE# and OE# are valid
OE#	Output enable	Controls data bus drivers; allows read operation independent of write cycle
WE#	Write enable	Controls SRAM write; STORE is triggered automatically on power loss, not by WE# assertion
V_CC	Power supply	5 V main supply; internal voltage monitor detects brown-out for STORE initiation
V_BACKUP	Battery input	Connects to integrated Li battery; powers SRAM and EEPROM during V_CC outage

Key Features

Feature	Design Value
Autonomous STORE/RECALL	Hardware-triggered non-volatility eliminates firmware dependency and reduces BOM count
Single 5 V supply	Removes need for auxiliary 3.3 V or battery-charging rails in legacy 5 V designs
10-year data retention	Enables long-life deployment in inaccessible equipment such as remote base stations and PLC modules
TTL-compatible interface	Direct connection to 8051, Z80, and older microcontrollers without level translators

Applications

Industrial PLC Configuration Storage

Telecom Line Card Status Logging

Use Scenario: Storing I/O mapping, calibration tables, and fault history in programmable logic controllers deployed in factory automation.

IC Role / Device Role / Timing Role: Non-volatile SRAM holding critical runtime configuration that must survive AC mains interruption or emergency stop events.

Use Value: Eliminates external EEPROM + SRAM + supervisor IC combination, reducing board area and qualification effort.

Use Scenario: Capturing link status, error counters, and provisioning data on telecom line cards operating in central office environments.

IC Role / Device Role / Timing Role: Acts as persistent scratchpad memory synchronized to power-fail detection for real-time network management updates.

Use Value: Guarantees zero data loss during grid fluctuations common in legacy telco power systems.

Medical Infusion Pump Parameter Backup

Avionics Data Recorder Buffer

Use Scenario: Retaining drug dosage limits, delivery profiles, and operator audit trails in Class II medical infusion devices subject to IEC 62304.

IC Role / Device Role / Timing Role: Safety-critical non-volatile memory ensuring therapy continuity after brief power interruptions during transport or battery swaps.

Use Value: Meets FDA requirement for deterministic data preservation without software-initiated save routines.

Use Scenario: Buffering flight parameter telemetry in black box recorders where power may be lost mid-flight due to system fault.

IC Role / Device Role / Timing Role: High-reliability memory capturing last 30 seconds of sensor data before crash-induced power loss.

Use Value: Achieves DO-160 Section 22 Category A survivability without external capacitive hold-up or complex power sequencing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS1248W+ from Analog Devices	45 ns access, but uses external lithium battery and requires external capacitor for STORE timing; larger 28-pin SOIC package	Requires additional passive components and layout space; less suitable for compact DIP-based legacy boards	Select if existing design already uses DS1248 footprint and external battery sourcing is preferred
FM1808-45 from Cypress (now Infineon)	Same 8-Kbit/45 ns spec, but uses ferroelectric RAM (FRAM); unlimited write endurance and faster STORE latency (~100 ns)	No battery or wear-out concerns; better for high-frequency logging, but higher cost and different timing margins	Select for new designs needing >1M STORE cycles or extended temperature range beyond +70°C

Compared with DS1248W+ and FM1808-45, the STK11C68-C45I offers lowest system integration complexity for retrofitting legacy 5 V DIP-based systems, balancing proven reliability, minimal BOM impact, and guaranteed 10-year retention without FRAM cost premium or external battery dependencies.

Availability

STK11C68-C45I is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, medical infusion pumps, and avionics data recorders requiring stable component supply and long-term obsolescence support.

Supply support for STK11C68-C45I 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, delivering intelligent power, sensing, and control solutions across automotive, industrial, and consumer markets.

The STK11C68 belongs to ST's legacy nvSRAM product line, designed specifically for seamless migration from volatile SRAM in safety- and reliability-critical systems where firmware-independent data preservation is mandatory.

FAQ

What happens during a brown-out event?

When V_CC falls below 3.0 V, the STK11C68-C45I automatically initiates STORE, transferring SRAM contents to internal EEPROM within 10 ms. The device enters low-power retention mode using its integrated lithium battery, preserving data until power returns and RECALL completes in 45 ns.

Can it be used in place of standard SRAM without design changes?

Yes - the STK11C68-C45I is pin- and timing-compatible with standard 1K×8 SRAMs like the HM6116LP-45. No changes to address/data bus routing, timing constraints, or firmware are required; STORE/RECALL operates entirely in hardware without software interaction.

Is the internal lithium battery replaceable?

No - the lithium battery is hermetically sealed inside the DIP package and not user-serviceable. ST guarantees 10-year data retention at +70°C under specified conditions, and the battery is sized to exceed this lifetime with margin; replacement is neither intended nor supported.

Does it support battery-free operation?

No - the STK11C68-C45I requires its internal lithium battery to retain data during power loss. If V_BACKUP is disconnected or depleted, STORE will fail and data will be lost on power-down; it is not functional as a volatile-only SRAM.

STK11C68-C45I Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 28-CDIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: NVSRAM

Technology:: NVSRAM (Non-Volatile SRAM)

Memory Size:: 64Kbit

Memory Organization:: 8K 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-CDIP

STK11C68-C45I FAQ

1.How can I place an order for STK11C68-C45I through Aetrix?

Please submit a Request for Quotation (RFQ) for STK11C68-C45I 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 STK11C68-C45I reliable?

The price and inventory of STK11C68-C45I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK11C68-C45I is usually 5 days.

3.What payment methods are accepted for STK11C68-C45I?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK11C68-C45I transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STK11C68-C45I?

STK11C68-C45I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STK11C68-C45I 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 STK11C68-C45I?

For technical support, including STK11C68-C45I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK11C68-C45I requirements.

6.How does Aetrix verify that STK11C68-C45I is sourced from the original manufacturer or authorized distributors?

All STK11C68-C45I 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 STK11C68-C45I meets industry standards.

7.What is the process for return or replacement of STK11C68-C45I?

All STK11C68-C45I units undergo pre-shipment inspection (PSI). If there is an issue with STK11C68-C45I, 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 STK11C68-C45I part is unused and in its original packaging.

Return procedure for STK11C68-C45I:

1.Submit a request within 90 days.

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

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