Infineon Technologies CY7C1399B-12ZC

Overview

CY7C1399B-12ZC from Cypress Semiconductor is a 256 Kbit (32K × 8) asynchronous CMOS static RAM operating at 3.3 V, with 12 ns access time, 55 mA max active current, and automatic CE-controlled power-down reducing standby current to 500 µA. It serves as low-voltage cache memory in embedded controllers and industrial communication modules requiring fast, deterministic read/write timing.

For engineers reviewing the CY7C1399B-12ZC datasheet, CY7C1399B-12ZC pinout, CY7C1399B-12ZC application, or CY7C1399B-12ZC equivalent, this page delivers verified package mapping (28-pin TSOP Type I), functional pin roles, real-world timing constraints (tRC = 12 ns, tHZOE = 5 ns), and validated alternatives for SRAM replacement in legacy 3.3V systems.

Technical Context

The CY7C1399B-12ZC implements a full 32K × 8 asynchronous SRAM array using alpha-immune 6T cells, supporting independent control of chip enable (CE), output enable (OE), and write enable (WE) for flexible bus interfacing. Its three-state I/O drivers and high-impedance retention during deselection enable direct connection to shared data buses without external isolation.

It features dual standby modes: TTL-compatible ISB1 (5 mA) when CE ≥ VIH, and ultra-low ISB2 (500 µA) under CMOS input conditions, with automatic transition triggered solely by CE state-no external control logic required. Address-to-data valid (tAA = 12 ns) and CE-to-power-down (tPD = 12 ns) are tightly matched for predictable cycle boundary handling.

Key Specifications

Pinout & Package

Package: 28-pin Thin Small Outline Package (TSOP Type I), 8.7 mm × 18.4 mm body, 0.55 mm pitch, lead-free (RoHS-compliant) variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV25616AL-12TLI and MCM6295DZP, the CY7C1399B-12ZC uniquely combines TSOP packaging, 500 µA ultra-low standby, and strict 12 ns timing compliance-making it the only choice for space-constrained, low-power, 8-bit bus designs requiring guaranteed data retention at 2.0 V.

Availability

CY7C1399B-12ZC is available at Aetrix Electronics and suitable for industrial PLC memory buffers, legacy network controller caches, and medical diagnostic display RAM requiring stable component supply across long-lifecycle programs.

Supply support for CY7C1399B-12ZC 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 connectivity solutions for industrial and automotive applications.

The CY7C1399B belongs to Cypress's legacy asynchronous SRAM product line, designed specifically for drop-in replacement of aging 5 V and 3.3 V SRAMs in cost-sensitive, reliability-critical embedded systems with fixed timing budgets.

FAQ

Is CY7C1399B-12ZC pin-compatible with CY7C1399B-12VC?

Yes, both share identical 28-pin signal mapping and electrical behavior, but differ in package: -12ZC uses TSOP Type I (Z28), while -12VC uses SOJ (V21). Mechanical mounting and PCB layout are not interchangeable, though schematic symbol and netlist remain identical.

Does CY7C1399B-12ZC support data retention below 3.3 V?

Yes-it guarantees data retention down to VCC = 2.0 V (per data sheet page 6), with ICCDR ≤ 20 µA. This allows use in brown-out scenarios or battery-backed operation where regulated 3.3 V may dip temporarily without loss of stored configuration.

What is the maximum clock frequency supported for burst read/write cycles?

The device is asynchronous and has no internal clock; its 12 ns access time supports effective bus frequencies up to 41.7 MHz for non-overlapped cycles. For burst transfers, timing depends on external controller setup/hold margins-not device clocking.

Can CY7C1399B-12ZC be used with 5 V tolerant microcontrollers?

No-its inputs are rated only to VCC + 0.3 V (≤ 3.6 V), and outputs swing 0.4 V/2.4 V relative to 3.3 V. Direct interface with 5 V logic requires level-shifting; it is not 5 V tolerant and sustained overvoltage will damage inputs.