Infineon Technologies CY7C1399BN-20ZXCT

Overview

CY7C1399BN-20ZXCT from Cypress Semiconductor is a 256K (32K × 8) high-speed CMOS static RAM operating at 3.3 V, with 20 ns maximum access time, 45 mA max operating current, and automatic CE-controlled power-down reducing standby current to 500 µA (industrial range). It serves as low-voltage cache memory in embedded controllers and industrial communication modules requiring deterministic read/write timing and alpha-particle immunity.

For engineers reviewing the CY7C1399BN-20ZXCT datasheet, CY7C1399BN-20ZXCT pinout, CY7C1399BN-20ZXCT application, or CY7C1399BN-20ZXCT equivalent, this page delivers verified package mapping (28-pin TSOP I), functional pin roles, real-world timing constraints (tRC = 20 ns, tDOE = 7 ns), and validated alternatives for SRAM replacement in space-constrained, low-power systems.

Technical Context

The CY7C1399BN-20ZXCT implements a 32K × 8 asynchronous SRAM architecture with TTL/CMOS-compatible control inputs (CE̅, OE̅, WE̅), tri-state bidirectional I/Os, and an alpha-immune 6T memory cell. Its automatic power-down activates when CE̅ is HIGH, dropping ICC to ≤500 µA without external logic.

It supports three distinct write cycles-WE-controlled, CE-controlled, and WE-controlled with OE̅ LOW-with guaranteed setup/hold times referenced to signal edges that terminate writes. All timing parameters are specified at VCC = 3.3 V ±300 mV and CL = 30 pF, with input transition times ≤3 ns.

Key Specifications

Pinout & Package

Package: 28-pin TSOP Type I (8 mm × 13.4 mm), Pb-free, RoHS-compliant, JEDEC MO-153 variant (package code 51-85071).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV25616AL-20TQLI and R1EX24064ASAS0I#U0, the CY7C1399BN-20ZXCT offers exact 32K × 8 alignment with legacy 8-bit designs, TSOP I pin compatibility, and proven industrial temperature reliability without bus-width or footprint conversion.

Availability

CY7C1399BN-20ZXCT is available at Aetrix Electronics and suitable for industrial PLC memory buffers, automotive telematics cache, and medical imaging frame buffers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY7C1399BN-20ZXCT 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 communications systems, emphasizing signal integrity and long-term supply stability.

The CY7C1399BN belongs to Cypress's legacy asynchronous SRAM product line, engineered specifically for deterministic, low-latency data buffering in resource-constrained embedded systems where DRAM complexity or flash write latency is unacceptable.

FAQ

What is the minimum VCC required to retain data in CY7C1399BN-20ZXCT?

Data retention is guaranteed down to VCC = 2.0 V under industrial temperature conditions, with retention current ≤20 µA. This allows safe operation during brown-out events where main supply drops below nominal 3.3 V but remains above 2.0 V, preserving RAM contents without external backup capacitors.

Does CY7C1399BN-20ZXCT require external pull-up resistors on control pins?

No external pull-ups are required: CE̅, OE̅, and WE̅ have TTL/CMOS-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and ≤1 µA input leakage. Direct connection to FPGA or MCU GPIOs suffices; pull-ups would increase standby current and violate ISB2 spec of 500 µA.

Can CY7C1399BN-20ZXCT be used in place of CY7C1399BN-20ZC?

Yes - CY7C1399BN-20ZXCT is the Pb-free (RoHS-compliant) version of CY7C1399BN-20ZC, sharing identical electrical specifications, timing, pinout, and thermal characteristics. The 'X' suffix denotes lead-free finish; both use the same 28-pin TSOP I package (51-85071) and operate across –40°C to +85°C.

What is the maximum clock frequency supported for burst reads using CY7C1399BN-20ZXCT?

The device is asynchronous and has no clock input; burst read speed is limited by tRC = 20 ns, enabling up to 50 MHz continuous read cycles. Address changes must meet tAA = 20 ns and tOHA = 3 ns hold requirements; no internal clock or PLL is involved.