Infineon Technologies CY7C1399BNL-15VXC

Overview

CY7C1399BNL-15VXC from Cypress Semiconductor is a 256K (32K × 8) high-speed CMOS static RAM with 15 ns access time, single 3.3 V supply operation, industrial temperature range (–40°C to +85°C), low active power (max. 50 mA ICC), and automatic CE-controlled power-down mode reducing standby current to 500 µA. It serves as cache or buffer memory in embedded controllers requiring deterministic timing and low-voltage compatibility.

For engineers reviewing the CY7C1399BNL-15VXC datasheet, CY7C1399BNL-15VXC pinout, CY7C1399BNL-15VXC application, or CY7C1399BNL-15VXC equivalent, this page delivers verified package mapping (28-pin SOJ), functional pin roles, real-world SRAM interface timing constraints, and validated drop-in alternatives for industrial memory subsystems.

Technical Context

The CY7C1399BNL-15VXC implements a 32K × 8 asynchronous SRAM architecture with TTL/CMOS-compatible control logic (CE, OE, WE), tri-state I/O drivers, and an alpha-immune 6T memory cell. Its automatic power-down activates when CE is HIGH, cutting ICC to ≤500 µA without external circuitry.

Timing is defined by overlapping CE and WE transitions: write initiation requires both LOW; read requires CE and OE LOW with WE HIGH. Address-to-data valid (tAA) and read cycle time (tRC) are both 15 ns at VCC = 3.3 V ±300 mV and TA = –40°C to +85°C.

Key Specifications

Pinout & Package

Package: 28-pin Plastic Small Outline J-Lead (SOJ), 300-mil width, Pb-free, JEDEC MO-088 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV25616AL-15TQLI and AS6C4008-15ZIN, the CY7C1399BNL-15VXC offers optimal fit for 3.3 V, byte-wide, space-constrained industrial designs-delivering lowest standby current (500 µA), smallest SOJ footprint, and guaranteed industrial temperature compliance without trade-offs in timing or reliability.

Availability

CY7C1399BNL-15VXC is available at Aetrix Electronics and suitable for industrial PLC data buffering, automotive ECU cache memory, and medical imaging line buffers requiring stable component supply across extended product lifecycles.

Supply support for CY7C1399BNL-15VXC 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) is a U.S.-based semiconductor company specializing in memory, microcontrollers, and programmable solutions for industrial, automotive, and consumer markets.

The CY7C1399B series was designed specifically for low-voltage, high-reliability SRAM applications in harsh-environment embedded systems-emphasizing fast access, ultra-low standby power, and robust process immunity.

FAQ

What is the maximum clock frequency supported by CY7C1399BNL-15VXC?

The CY7C1399BNL-15VXC is an asynchronous SRAM and does not use a clock signal. Its performance is governed by timing parameters such as tRC (15 ns read cycle time), which corresponds to a maximum effective throughput of approximately 66.7 MHz for consecutive random accesses. System timing must comply with setup/hold requirements for CE, OE, WE, and address signals-not a clock frequency.

Does CY7C1399BNL-15VXC support battery backup operation?

Yes-when VCC drops to ≥2.0 V and CE is held HIGH, the device enters data retention mode with ICCDR ≤20 µA. This allows integration with coin-cell or supercapacitor backup circuits. The 6T cell design ensures data integrity for up to 24 hours under retention conditions, provided ambient temperature remains within –40°C to +85°C.

Can CY7C1399BNL-15VXC be used with 5 V microcontrollers?

No-its absolute maximum input voltage is VCC + 0.5 V (≤3.8 V), and VIH minimum is 2.2 V. Direct connection to 5 V logic violates voltage ratings and risks permanent damage. Level translation (e.g., TXB0108 or discrete MOSFET translators) is mandatory for interfacing with 5 V systems.

Is there a pin-compatible replacement for CY7C1399BNL-15VXC with extended temperature range?

No direct pin-compatible replacement extends beyond –40°C to +85°C. The CY7C1399BNL-15VXC itself is rated for the full industrial range. For extended ranges (e.g., –55°C to +125°C), no functionally identical 28-pin SOJ SRAM exists; redesign to a different package (e.g., TSOP) or vendor would be required, with no guaranteed pin or timing compatibility.