Infineon Technologies CY7C1399BN-15VXCT

Overview

CY7C1399BN-15VXCT from Cypress Semiconductor is a 256K (32K × 8) asynchronous CMOS static RAM with 3.3V single-supply operation, 15 ns maximum access time, industrial temperature range (–40°C to +85°C), and automatic CE-controlled power-down mode reducing standby current to 500 µA. It serves as cache or buffer memory in embedded controllers requiring fast, low-power, non-volatile-retentive data storage.

For engineers reviewing the CY7C1399BN-15VXCT datasheet, CY7C1399BN-15VXCT pinout, CY7C1399BN-15VXCT application, or CY7C1399BN-15VXCT equivalent, key selection criteria include access timing consistency across temperature, tri-state I/O compatibility with 3.3V logic families, CE/OE/WE control interface behavior, and Pb-free SOJ package mechanical fit for legacy board layouts.

Technical Context

The CY7C1399BN-15VXCT implements a fully decoded 32K × 8 SRAM array using alpha-immune 6T cells, supporting asynchronous read/write cycles controlled by independent CE, OE, and WE signals. Its dual power-down modes-TTL- and CMOS-input variants-enable sub-1 mA standby under deselected conditions while maintaining full 3.3V I/O voltage tolerance.

Timing is defined by overlapping CE and WE assertions for writes, with address-to-data valid (tAA = 15 ns) and CE-to-output-valid (tACE = 15 ns) tightly matched. Output enable delay (tDOE = 6 ns) and high-impedance transition times (tHZOE = 6 ns, tLZCE = 3 ns) ensure clean bus sharing in multi-device systems without external bus contention logic.

Key Specifications

Pinout & Package

28-pin Plastic Small Outline J-Lead (SOJ), 300-mil body width, Pb-free finish, JEDEC MO-088 compliant. Pin 1 identifier marked by notch or bevel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV25616AL-15TQLI, CY7C1399BN-15VXCT offers pin-compatible 8-bit bus alignment and smaller SOJ footprint; compared with MC68HC908QT4CP, it provides field-upgradable memory capacity and deterministic timing independent of CPU clock domain.

Availability

CY7C1399BN-15VXCT is available at Aetrix Electronics and suitable for industrial PLC data buffering, automotive body control modules, medical imaging FIFOs, and avionics display caches requiring stable component supply across extended product lifecycles.

Supply support for CY7C1399BN-15VXCT 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, PSoC, and USB solutions for industrial, automotive, and consumer applications.

The CY7C1399BN belongs to Cypress's legacy high-speed asynchronous SRAM product line, designed specifically for drop-in replacement of older 5V SRAMs in 3.3V system upgrades while preserving timing margins and board layout.

FAQ

What is the minimum VCC required to retain data in CY7C1399BN-15VXCT?

Data retention is guaranteed down to VCC = 2.0 V, with maximum retention current of 20 µA under those conditions. This allows use in battery-backed applications where main supply may dip below nominal 3.3 V during brownout events, provided CE remains asserted and address/data lines are held static.

Does CY7C1399BN-15VXCT require external pull-up resistors on control pins?

No external pull-ups are required. All control inputs (CE, OE, WE) have TTL- and CMOS-compatible thresholds, and internal weak pull-downs ensure defined states during power-up. However, external pull-downs on CE are recommended in systems where power sequencing risks floating chip enable during reset.

Can CY7C1399BN-15VXCT operate reliably at 85°C ambient with full timing specifications?

Yes. The industrial-grade qualification explicitly guarantees tAA ≤ 15 ns, tACE ≤ 15 ns, and ISB2 ≤ 500 µA across –40°C to +85°C ambient. Thermal derating is not required; all AC and DC parameters in the datasheet apply fully at maximum temperature.

Is the SOJ package of CY7C1399BN-15VXCT compatible with standard reflow profiles?

Yes. The Pb-free SOJ package is qualified for IPC/JEDEC J-STD-020D-compliant reflow, with peak temperature up to 260°C for ≤60 seconds. Board designers must follow Cypress's recommended pad layout (51-85031) and thermal relief patterns to prevent solder joint voiding or tombstoning.