Infineon Technologies CY7C1399BNL-12ZXCT

Overview

CY7C1399BNL-12ZXCT from Cypress Semiconductor is a 256-Kbit (32 K × 8) high-speed CMOS static RAM operating at 3.3 V, featuring 12 ns access time, 180 mW max active power, and automatic CE-controlled power-down reducing standby current to ≤5 µA (TTL inputs) or ≤500 µA (CMOS inputs). It serves as low-voltage cache memory in industrial embedded controllers requiring deterministic timing and data retention down to 2.0 V.

For engineers reviewing the CY7C1399BNL-12ZXCT datasheet, CY7C1399BNL-12ZXCT pinout, CY7C1399BNL-12ZXCT application, or CY7C1399BNL-12ZXCT equivalent, key selection criteria include guaranteed 12 ns read cycle time, tristate I/O with independent OE/WE/CE control, -40 °C to +85 °C industrial temperature rating, TSOP-I package compatibility, and low-power alpha-immune 6T cell architecture.

Technical Context

The CY7C1399BNL-12ZXCT implements a fully asynchronous 32 K × 8 SRAM array with separate chip enable (CE), output enable (OE), and write enable (WE) controls. Its logic supports three distinct operational modes: read (CE=LOW, OE=LOW, WE=HIGH), write (CE=LOW, WE=LOW), and power-down (CE=HIGH), with automatic high-impedance I/O state management during deselect.

It uses a low-power alpha-immune 6T cell design enabling reliable data retention at VCC ≥ 2.0 V and delivering ≤20 µA retention current. Timing is specified under 3.3 V ±300 mV, CL = 30 pF, and input transition times ≤3 ns, with tRC = 12 ns, tAA = 12 ns, and tDOE = 5 ns - all guaranteed over full industrial temperature range.

Key Specifications

Pinout & Package

The CY7C1399BNL-12ZXCT is supplied in a 28-pin TSOP-I (Thin Small Outline Package, Type I), 8.1 mm × 13.4 mm body, 0.5 mm lead pitch, lead-free (RoHS-compliant) construction. Pin numbering follows JEDEC MO-153 standard with pins 1–14 on bottom row (left-to-right), pins 15–28 on top row (right-to-left).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar static RAM applications.

Compared with IS61LV25616AL-12TLI and MC68HC11E9CP, the CY7C1399BNL-12ZXCT uniquely delivers byte-wide 32 K × 8 organization with industry-standard TSOP-28 pinout, guaranteed 12 ns timing at industrial temperature, and true tristate bus control - making it irreplaceable in legacy 8-bit bus designs requiring pin- and timing-compatible upgrades.

Availability

CY7C1399BNL-12ZXCT is available at Aetrix Electronics and suitable for industrial PLC memory buffers, automotive body control module caches, medical diagnostic equipment FIFOs, and test & measurement instrument buffers requiring stable component supply and long-term lifecycle support.

Supply support for CY7C1399BNL-12ZXCT 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 fabless semiconductor company specializing in memory, microcontrollers, and programmable solutions for industrial, automotive, and consumer markets.

The CY7C1399BN series belongs to Cypress's legacy high-speed CMOS SRAM product line, designed specifically for low-voltage, low-power, and timing-critical embedded memory applications where reliability and deterministic access matter more than density scaling.

FAQ

What is the maximum clock frequency supported by CY7C1399BNL-12ZXCT?

The CY7C1399BNL-12ZXCT is an asynchronous SRAM and does not use a clock signal. Its maximum effective interface rate is determined by its 12 ns read cycle time (tRC), supporting up to ~83 MHz burst reads when interfaced with a controller capable of meeting setup/hold timing. No internal clock circuitry exists.

Does CY7C1399BNL-12ZXCT require external pull-up resistors on control lines?

No external pull-ups are required on CE, OE, or WE - all control inputs meet TTL-compatible thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and have ≤1 µA leakage. However, floating inputs must be avoided; unused control lines should be tied to VCC or GND via PCB traces, not left unconnected.

Can CY7C1399BNL-12ZXCT operate reliably at 3.0 V supply?

No - the device is specified only for 3.3 V ±300 mV (i.e., 3.0 V to 3.6 V). Operation at exactly 3.0 V falls at the lower limit of the commercial range but is outside the guaranteed industrial specification. At 3.0 V, tRC may exceed 12 ns and data retention voltage drops below 2.0 V, risking functional failure.

Is the TSOP-I package of CY7C1399BNL-12ZXCT RoHS-compliant and lead-free?

Yes - the "L" suffix in CY7C1399BNL-12ZXCT denotes lead-free (Pb-free) construction per RoHS Directive 2011/65/EU. The TSOP-I package uses matte tin lead finish, with JEDEC-compliant moisture sensitivity level (MSL) 3 and reflow profile compatible with standard Pb-free soldering processes.