Infineon Technologies CY14B116M-BZ45XI

Overview

CY14B116M-BZ45XI from Infineon Technologies (formerly Cypress) is a 16-Mbit nonvolatile SRAM with integrated real-time clock, organized as 1024 K × 16, featuring 45-ns access time, AutoStore on power-down, software/hardware STORE/RECALL, and RTC with alarm, watchdog, and programmable square wave output. It serves as a drop-in replacement for battery-backed SRAM in industrial data logging systems requiring deterministic nonvolatile write retention.

For engineers reviewing the CY14B116M-BZ45XI datasheet, CY14B116M-BZ45XI pinout, CY14B116M-BZ45XI application, or CY14B116M-BZ45XI equivalent, key selection criteria include ×16 bus interface compatibility, VCC range (2.7–3.6 V), industrial temperature support (–40 °C to +85 °C), RTC backup current (0.45 µA typ), and FBGA/TSOP II package options with dual CE support.

Technical Context

The device integrates a high-speed SRAM array (4096 × 4096) with parallel QuantumTrap nonvolatile storage cells, enabling simultaneous STORE/RECALL across all memory locations without byte-by-byte sequencing. Its RTC subsystem includes a 32.768-kHz crystal oscillator, leap-year calendar logic, and interrupt-driven alarm/wdog events mapped to a single open-drain INT pin.

Power management is implemented via three distinct low-power states: standby (750 µA), sleep mode (10 µA, FBGA only), and AutoStore activation triggered by VCC decay monitored through VCAP. The HSB pin provides hardware handshake signaling for STORE completion, while CE1/CE2 logic enables dual-chip-enable arbitration in FBGA configurations.

Key Specifications

Pinout & Package

Package: 54-pin TSOP II (×16 configuration) and 165-ball FBGA (dual CE, Sleep mode supported). Pinout validated per Cypress document #001-67786 Rev. *K, Figures 2 and 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14C88-3AJ5F and FM33256B-DBQ-TR, CY14B116M-BZ45XI uniquely delivers 16-Mbit ×16 nvSRAM + full RTC in one package, balancing density, deterministic STORE timing, and industrial-grade data retention - making it optimal for embedded systems requiring both large nonvolatile buffers and precise timekeeping.

Availability

CY14B116M-BZ45XI is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, medical diagnostic devices, and PLC I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for CY14B116M-BZ45XI 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 and maintains its portfolio of high-reliability memory and timing solutions for industrial and automotive markets.

This part belongs to the nvSRAM + RTC product line, designed specifically for mission-critical applications where data integrity during power loss and accurate time stamping cannot be compromised - such as utility infrastructure, patient monitoring, and factory automation.

FAQ

What is the function of the HSB pin during normal operation?

The HSB (Hardware STORE Busy) pin operates as an open-drain status indicator. During a STORE operation-whether initiated by power-down, software command, or external LOW assertion-HSB is driven LOW. Once STORE completes, it transitions HIGH via internal weak pull-up. It can also be used as an input to trigger STORE when pulled LOW by external circuitry, enabling hardware-controlled nonvolatile writes independent of firmware.

Can VRTCcap and VRTCbat be used simultaneously?

No. VRTCcap and VRTCbat are mutually exclusive RTC backup supply inputs. VRTCcap is intended for capacitor-based backup (e.g., 0.1–0.47 F supercapacitor), while VRTCbat accepts a 1.8–3.6 V battery (e.g., CR2032). Only one should be connected; the other must remain floating. Using both risks reverse current flow and may damage the RTC power management circuitry.

How does the AutoStore mechanism ensure data integrity during rapid power loss?

AutoStore relies on the VCAP capacitor (typically 4.7 µF) charged to VCC. When VCC drops below ~2.5 V, internal circuitry detects the decay and initiates STORE within 10 µs. The capacitor supplies regulated current to complete SRAM-to-QuantumTrap transfer in ≤15 ms. This design guarantees full 16-Mbit retention even if VCC collapses in under 100 µs, provided VCAP meets minimum capacitance and ESR specs per datasheet Section 30.

Is the CY14B116M-BZ45XI compatible with legacy CY14B116M designs?

Yes. CY14B116M-BZ45XI is a direct replacement for earlier CY14B116M variants with identical pinout (54-pin TSOP II), electrical specifications, timing parameters, and register-level RTC programming model. Infineon maintains full backward compatibility, including identical device ID, command set, and initialization sequence - no PCB or firmware changes are required for migration.