Infineon Technologies CY7C1399BN-15ZXCT

Overview

CY7C1399BN-15ZXCT from Cypress Semiconductor is a 256K (32K × 8) high-speed CMOS static RAM operating at 3.3 V, with 15 ns maximum access time, industrial temperature range (–40°C to +85°C), and automatic CE-controlled power-down reducing standby current to 500 µA. It supports cache memory in embedded controllers and real-time data buffering in industrial PLCs.

For engineers reviewing the CY7C1399BN-15ZXCT datasheet, CY7C1399BN-15ZXCT pinout, CY7C1399BN-15ZXCT application, or CY7C1399BN-15ZXCT equivalent, key selection criteria include TTL/CMOS-compatible control timing, low active power (≤180 mW), dual-package availability (TSOP I and SOJ), and verified data retention at 2.0 V.

Technical Context

The CY7C1399BN-15ZXCT implements a 32K × 8 asynchronous SRAM architecture with independent tri-state I/O drivers, active-low CE/OE/WE controls, and an alpha-immune 6T memory cell. Its read cycle is governed by tRC = 15 ns, tAA = 15 ns, and tDOE = 6 ns under industrial conditions.

Power management relies on automatic CE-driven power-down mode, achieving ISB2 = 500 µA (CMOS inputs) at VCC = 3.3 V and fMAX. Address and data lines are fully decoupled via separate row/column decoding, enabling stable operation without external wait-state logic.

Key Specifications

Pinout & Package

CY7C1399BN-15ZXCT is supplied in a 28-pin TSOP I package (JEDEC MO-153, 8 mm × 13.4 mm body, 0.55 mm pitch), lead-free (Pb-free) compliant per RoHS Directive 2011/65/EU.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV25616AL-15TQLI and MCM6295DWX, CY7C1399BN-15ZXCT offers native 8-bit bus alignment, industrial temperature support, and Pb-free TSOP I compatibility - making it optimal for cost-sensitive, space-constrained 3.3 V microcontroller systems requiring proven long-term supply.

Availability

CY7C1399BN-15ZXCT is available at Aetrix Electronics and suitable for industrial PLC data buffering, automotive ECU cache, medical imaging FIFO, and telecom line card packet buffering requiring stable component supply across extended product lifecycles.

Supply support for CY7C1399BN-15ZXCT 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 since 2020) is a U.S.-based semiconductor company specializing in memory, microcontrollers, and connectivity solutions for industrial and automotive markets.

CY7C1399BN belongs to Cypress's legacy high-speed asynchronous SRAM product line, designed specifically for low-latency, low-power volatile memory in resource-constrained embedded systems requiring deterministic timing and long-term manufacturability.

FAQ

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

The device guarantees data retention down to 2.0 V (VDR) under industrial conditions, with ICCDR ≤ 20 µA. This allows operation during brown-out events without external backup capacitors exceeding 100 µF, provided CE remains asserted and address/data lines are held static.

Does CY7C1399BN-15ZXCT require external pull-up resistors on control lines?

No. All control inputs (CE, OE, WE) are CMOS-compatible with VIH ≥ 2.2 V and VIL ≤ 0.8 V at VCC = 3.3 V. Internal input thresholds eliminate need for external biasing; however, PCB routing should minimize stub length to avoid signal integrity issues at 66 MHz effective bus rates.

Can CY7C1399BN-15ZXCT be used in place of CY7C1399BN-15ZI?

Yes - CY7C1399BN-15ZXCT is the Pb-free variant of CY7C1399BN-15ZI, sharing identical timing, electrical, and thermal specifications. The 'X' suffix denotes RoHS-compliant lead finish; both use the same 51-85071 TSOP I package outline and mounting footprint.

What is the maximum capacitive load the I/O pins can drive reliably?

The outputs are characterized for CL = 30 pF (per AC test conditions), with guaranteed tHZOE ≤ 6 ns and tLZOE = 0 ns. For loads >30 pF, propagation delay increases linearly; derating is required beyond 50 pF unless series termination is applied per JEDEC JESD8-12E guidelines.