Infineon Technologies CY14B108M-ZSP45XIT

Overview

CY14B108M-ZSP45XIT from Cypress Semiconductor is an 8-Mbit nonvolatile SRAM (512 K × 16) with integrated real-time clock (RTC), watchdog timer, and alarm functionality. It operates at 3.0 V ±10%, delivers 45 ns access time, supports AutoStore on power-down via VCAP capacitor, and retains data for 20 years. Used in industrial control systems requiring persistent time-stamped memory during brownouts.

For engineers reviewing the CY14B108M-ZSP45XIT datasheet, CY14B108M-ZSP45XIT pinout, CY14B108M-ZSP45XIT application, or CY14B108M-ZSP45XIT equivalent, key selection criteria include ×16 bus interface support, RTC backup via VRTCcap/VRTCbat, HSB-controlled hardware STORE, software-initiated RECALL, and industrial temperature range (–40°C to +85°C).

Technical Context

The device integrates a 512 K × 16 SRAM array with QuantumTrap nonvolatile elements enabling parallel STORE/RECALL. RTC includes leap-year tracking, programmable oscillator calibration, and interrupt-driven alarms (minutes/hours/days/months). The watchdog timer provides process supervision with configurable timeout.

AutoStore triggers automatically when VCC drops below VSWITCH, using charge stored on the external VCAP capacitor. Hardware STORE is initiated by pulling HSB LOW; software STORE uses address-based command sequences. RECALL occurs on power-up or via software, restoring SRAM contents from nonvolatile cells.

Key Specifications

Pinout & Package

Package: 54-pin Thin Small Outline Package (TSOP II), RoHS-compliant, lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14CA8-NL55T3 and FM24V10-G, CY14B108M-ZSP45XIT uniquely combines ×16 interface, full RTC with alarm/watchdog, and monolithic QuantumTrap storage - reducing component count and improving time synchronization reliability in industrial edge nodes.

Availability

CY14B108M-ZSP45XIT is available at Aetrix Electronics and suitable for industrial data loggers, PLC control units, smart energy meters, and factory HMI systems requiring stable component supply with guaranteed 20-year data retention and RTC-backed time stamping.

Supply support for CY14B108M-ZSP45XIT 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 mixed-signal ICs for industrial, automotive, and IoT applications, with emphasis on nonvolatile memory and timing solutions.

This part belongs to the CY14B nvSRAM product line, engineered specifically for systems needing deterministic, battery-free data persistence and synchronized real-time operations in harsh environments.

FAQ

What is the function of the VCAP pin?

The VCAP pin connects to an external capacitor (typically 10 µF tantalum) that supplies energy during VCC dropout to complete a STORE operation. When VCC falls below VSWITCH (~2.5 V), the device isolates VCAP and uses its stored charge to transfer SRAM contents to QuantumTrap nonvolatile cells - ensuring zero data loss without battery backup.

Can CY14B108M-ZSP45XIT operate in ×8 mode?

No - CY14B108M is internally organized as 512 K × 16 and requires A0–A18 address lines and DQ0–DQ15 data lines. The ×8 variant is the CY14B108K (1024 K × 8), which uses A0–A19 and DQ0–DQ7. Pin compatibility does not imply functional interchangeability between M and K suffixes.

How is the RTC calibrated for accuracy?

Calibration is performed by writing a 16-bit trim value to the RTC Trim Register (address 0x0000000E), adjusting the 32.768 kHz oscillator frequency in ±1.5 ppm steps. Typical factory calibration achieves ±2 ppm accuracy over –40°C to +85°C, meeting industrial timekeeping requirements without external compensation.

Is AutoStore disabled by default?

No - AutoStore is enabled by default and activates automatically on VCC drop below VSWITCH. To disable it, a specific software sequence must be executed: write 0x00 to address 0x00000000, then 0x01 to address 0x00000001. This prevents unintended STORE attempts when no VCAP capacitor is installed.