Infineon Technologies CY7C199C-15ZC

Overview

CY7C199C-15ZC from Cypress Semiconductor is a 256K-bit (32K × 8) asynchronous CMOS static RAM with 15 ns access time, TTL-compatible I/Os, and automatic CE-controlled power-down. It operates across 4.5V–5.5V and retains data at 2.0V, supporting embedded microcontroller systems requiring fast, low-power, non-volatile-critical memory buffering.

For engineers reviewing the CY7C199C-15ZC datasheet, CY7C199C-15ZC pinout, CY7C199C-15ZC application, or CY7C199C-15ZC equivalent, key selection criteria include access timing consistency, CE-driven standby current (10 µA), VCC range tolerance, and SOJ/TSOP/DIP package compatibility in industrial temperature environments.

Technical Context

The CY7C199C-15ZC implements a fully asynchronous SRAM architecture with independent address decoding, sense amplifier-based read path, and bidirectional I/O buffers controlled by CE, OE, and WE. Its power-down circuit activates automatically when CE is deasserted, reducing ICC to 10 µA under CMOS input conditions.

Timing behavior is defined by overlapping control signals: write initiation requires simultaneous CE and WE assertion, while read validity depends on tACE (15 ns max) and tDOE (7 ns max). Data retention at 2.0V is guaranteed with no external refresh, and all AC parameters are specified at VCC = 5.0V ±10% and TA = –40°C to +85°C.

Key Specifications

Pinout & Package

Available in 28-pin SOJ (300-mil), 28-pin TSOP I, and 28-pin DIP packages. Pin functions are identical across packages; physical layout varies per outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV25616AL-15TQLI and MCM6295DW15, the CY7C199C-15ZC uniquely delivers 5V TTL compatibility, 2.0V data retention, and autonomous 10 µA standby-making it optimal for drop-in replacement in industrial 5V systems where power efficiency and brown-out resilience are design constraints.

Availability

CY7C199C-15ZC is available at Aetrix Electronics and suitable for industrial PLC memory buffers, legacy MCU external RAM expansion, and medical instrument data acquisition requiring stable component supply across long-lifecycle programs.

Supply support for CY7C199C-15ZC 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 logic solutions for industrial, automotive, and communications infrastructure.

The CY7C199C belongs to Cypress's legacy asynchronous SRAM product line, engineered specifically for 5V embedded systems needing predictable timing, low static power, and robust data retention during voltage transients.

FAQ

What is the minimum VCC required to retain data in CY7C199C-15ZC?

The CY7C199C-15ZC guarantees data retention down to 2.0V (VDR), as verified in the Data Retention Characteristics table (Page 6 of Rev. *C datasheet). At this voltage, ICCDR remains ≤150 µA with CE held high and inputs biased to CMOS thresholds. Operation below 2.0V risks data loss, and no retention time is specified below that threshold.

Does CY7C199C-15ZC support true 3-state outputs when disabled?

Yes. When CE is HIGH or OE is HIGH (with CE LOW), all I/O0–I/O7 pins enter high-impedance state, confirmed by tLZOE = 0 ns and tHZOE = 7 ns in the AC Electrical Characteristics table. Output leakage current is bounded at ±5 µA under these conditions, meeting standard 3-state interface requirements.

Can CY7C199C-15ZC be used in place of CY7C199-15ZC?

Yes - the "C" suffix denotes the commercial/industrial grade revision with identical pinout, timing, and electrical specs. The CY7C199C-15ZC replaces earlier CY7C199-15ZC versions and incorporates process and test enhancements documented in Rev. *C (August 2006); no design changes affect system-level compatibility.

What is the thermal resistance (ΘJA) for the 28-pin SOJ package?

The 28-pin SOJ package has ΘJA = 79°C/W under standard test conditions: still air, soldered on a 3 × 4.5 inch two-layer PCB (Document #: 38-05408 Rev. *C, Page 5). This value assumes proper copper pour and thermal vias; actual board layout may raise junction temperature by up to 15°C above ambient at full ICC = 80 mA.