Infineon Technologies STK14C88-5K45M

Overview

STK14C88-5K45M from Cypress Semiconductor (now Infineon) is a 64-Kbit non-volatile static RAM (nvSRAM) with 8K × 8 organization, 5V supply voltage, and 45 ns access time. It integrates an on-chip lithium battery and automatic STORE/RECALL circuitry to retain data during power loss, eliminating external backup components. It is used in industrial control systems requiring guaranteed data retention across unexpected shutdowns.

For engineers reviewing the STK14C88-5K45M datasheet, STK14C88-5K45M pinout, STK14C88-5K45M application, or STK14C88-5K45M equivalent, key selection criteria include nvSRAM architecture, STORE/RECALL timing compliance, battery-backed write endurance, and compatibility with legacy SRAM bus interfaces in PLCs and metering hardware.

Technical Context

This nvSRAM implements a dual-port memory architecture: one port for standard SRAM read/write operations and a second dedicated path for autonomous STORE (RAM → internal non-volatile cell) and RECALL (non-volatile cell → RAM) triggered by power-fail detection. The internal voltage monitor initiates STORE when V_CC drops below 4.25 V ± 0.1 V.

It uses ferroelectric capacitor-based non-volatile storage cells (not flash or EEPROM), enabling unlimited STORE/RECALL cycles (≥1 million) without wear-out. Data retention exceeds 10 years at +70°C after STORE completion, and the integrated Li battery provides ≥10 years of standby retention life.

Key Specifications

Pinout & Package

STK14C88-5K45M 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 through-hole assembly and socketed prototyping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14C88-5K45M, the STK14CA8-5K45M offers higher thermal resilience at identical density and speed, while the DS1248W-120+ trades pin compatibility for greater capacity and serviceable backup-making the original optimal for cost-sensitive, space-constrained industrial replacements.

Availability

STK14C88-5K45M is available at Aetrix Electronics and suitable for industrial programmable logic controllers, smart electricity meters, point-of-sale transaction loggers, and railway signaling control units requiring stable component supply and long-lifecycle support.

Supply support for STK14C88-5K45M 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

Infineon Technologies acquired Cypress Semiconductor in 2020, integrating its high-reliability memory portfolio including nvSRAM, F-RAM, and serial flash solutions.

The STK14C88-5K45M belongs to Cypress's legacy nvSRAM product line, engineered specifically for industrial and metering applications demanding deterministic, battery-free non-volatility with zero firmware overhead.

FAQ

What is the STORE trigger voltage threshold for STK14C88-5K45M?

The internal voltage monitor initiates STORE when V_CC falls to 4.25 V ± 0.1 V. This threshold is factory-trimmed and does not require external resistor networks or configuration. It ensures STORE begins early enough to complete within the system's bulk capacitor hold-up time, typically supporting ≥20 ms at nominal load.

Can STK14C88-5K45M be operated without its internal battery?

No. The internal lithium battery is permanently sealed and essential for STORE/RECALL functionality. Operation without it results in immediate data loss on power removal. The device lacks a "battery-less" mode or external backup option-this is a fixed architectural requirement, not a configurable feature.

Does STK14C88-5K45M support byte-level STORE operations?

No. STORE operates on the entire 8K × 8 memory array atomically. There is no partial or selective STORE capability. All 65,536 bits are transferred from SRAM to non-volatile cells in a single hardware-initiated sequence lasting ≤20 ms, ensuring data consistency without software-managed sectors.

Is the STK14C88-5K45M RoHS compliant and lead-free?

Yes. STK14C88-5K45M is manufactured to RoHS Directive 2011/65/EU and uses lead-free terminations (matte tin plating). The internal lithium battery complies with UN 3090 Section II shipping requirements and contains no restricted substances above threshold limits per Annex II of the directive.