Infineon Technologies CY14B104N-ZS45XCT

Overview

CY14B104N-ZS45XCT from Cypress Semiconductor is a 4 Mbit nonvolatile SRAM (nvSRAM) with 256K × 16 organization, 45 ns access time, single 3V (+20% to –10%) supply, and integrated QuantumTrap® nonvolatile storage. It performs automatic STORE on power loss using an external VCAP capacitor and supports software- or hardware-initiated STORE/RECALL. Used in industrial controllers for real-time data retention during unexpected power failure.

For engineers reviewing the CY14B104N-ZS45XCT datasheet, CY14B104N-ZS45XCT pinout, CY14B104N-ZS45XCT application, or CY14B104N-ZS45XCT equivalent, key selection criteria include x16 bus width support, HSB-driven hardware store control, VCAP-based AutoStore timing, and 200,000 STORE cycle endurance with 20-year data retention.

Technical Context

The CY14B104N operates as a parallel-interface nvSRAM with dual-function memory cells combining standard SRAM and QuantumTrap nonvolatile elements. Its architecture enables concurrent SRAM read/write and independent STORE/RECALL operations - with STORE requiring either HSB assertion, software address sequence, or VCC drop below VSWITCH.

It supports x16 configuration with BHE/BLE byte enable control, uses A0–A17 for addressing, and implements open-drain HSB signaling for hardware store coordination. The VCAP pin supplies regulated backup power for one full STORE operation during brownout, eliminating need for external battery or supercapacitor management circuitry.

Key Specifications

Pinout & Package

Package: 48-ball FBGA (9 mm × 9 mm, 0.8 mm pitch), RoHS-compliant, suitable for high-density PCB layouts in space-constrained industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS4C4M16SA-6TCN and FM24V04-G, CY14B104N-ZS45XCT uniquely integrates hardware-triggered STORE with open-drain HSB signaling and VCAP-based autonomous power-loss response - delivering deterministic, zero-software-overhead nonvolatility for SIL-2/IEC 61508 applications.

Availability

CY14B104N-ZS45XCT is available at Aetrix Electronics and suitable for industrial controllers, smart meters, and railway signaling systems requiring stable component supply, long-lifecycle support, and guaranteed nonvolatile data retention under brownout conditions.

Supply support for CY14B104N-ZS45XCT 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 memory and programmable solutions for industrial, automotive, and IoT applications.

CY14B104N belongs to the QuantumTrap nvSRAM product line, engineered specifically for mission-critical systems needing battery-free, deterministic nonvolatile storage with SRAM-speed performance.

FAQ

What is the minimum VCAP capacitance required for reliable AutoStore operation?

The CY14B104N-ZS45XCT requires a 0.1 µF ±20% X7R ceramic capacitor on the VCAP pin. This value is validated for 45 ns access time operation across –40°C to +85°C and ensures full STORE completion even with 2.7 V VCC dropout lasting up to 10 ms. Larger values do not improve reliability and may slow VCAP recharge.

Can HSB be left unconnected if hardware STORE is not used?

Yes - HSB has an internal weak pull-up and may be left floating if unused. When disconnected, it remains HIGH during normal operation and does not affect SRAM functionality. However, leaving it unconnected forfeits hardware-initiated STORE capability and real-time STORE progress monitoring via external logic.

How does the software STORE sequence prevent accidental activation?

The six-address sequence (0x4E38 → 0xB1C7 → 0x83E0 → 0x7C1F → 0x703F → 0x8FC0) must be executed as consecutive CE-controlled reads with WE held HIGH. Any intervening write, address violation, or timing breach (e.g., tSS < 100 ns between reads) aborts the sequence - ensuring STORE only occurs under deliberate, validated firmware control.

Is the CY14B104N-ZS45XCT pin-compatible with CY14B104L variants?

No - CY14B104N (256K × 16) and CY14B104L (512K × 8) differ in address/data pin mapping: CY14B104N uses A0–A17 and DQ0–DQ15 with BHE/BLE, while CY14B104L uses A0–A18 and DQ0–DQ7. Their 48-ball FBGA footprints share mechanical compatibility but require PCB layout revision for signal routing.