Infineon Technologies CY7C199C-12VXI

Overview

CY7C199C-12VXI from Cypress Semiconductor is a 256K (32K × 8) asynchronous CMOS static RAM with 12 ns access time, 5.0 V ±10% supply voltage, TTL-compatible I/Os, automatic CE-controlled power-down, and 2.0 V data retention. It operates in commercial temperature range (0°C to +70°C) and is packaged in 28-pin SOJ for embedded memory buffering in microcontroller-based systems.

For engineers reviewing the CY7C199C-12VXI datasheet, CY7C199C-12VXI pinout, CY7C199C-12VXI application, or CY7C199C-12VXI equivalent, key selection criteria include access time vs. standby current trade-offs, CE/OE/WE control timing compatibility, package footprint constraints (SOJ), and 5 V system-level voltage margin requirements.

Technical Context

The CY7C199C-12VXI implements a fully asynchronous SRAM interface with independent chip enable (CE), output enable (OE), and write enable (WE) controls. Its internal architecture includes address decoding logic, sense amplifiers, and an automated power-down circuit triggered when CE is deasserted.

It supports two read modes (CE-controlled and OE-controlled) and two write modes (WE-controlled and CE-controlled), with timing parameters tightly specified for tRC (12 ns), tAA (12 ns), tACE (12 ns), and tHZCE (5 ns). Data retention at 2.0 V enables low-power hold states without full VCC.

Key Specifications

Pinout & Package

Package: 28-pin Small Outline J-Lead (SOJ), 300 mil width, lead-free compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS6C4008-12PIN and IS61LV25616AL-12TQLI, the CY7C199C-12VXI uniquely supports 5 V operation with TTL compatibility and SOJ packaging-making it the only drop-in solution for legacy 5 V microcontroller memory expansion without voltage or bus-width conversion.

Availability

CY7C199C-12VXI is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy microcontroller memory expansion, and medical instrumentation data logging requiring stable component supply across extended product lifecycles.

Supply support for CY7C199C-12VXI 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 consumer electronics.

The CY7C199C belongs to Cypress's legacy asynchronous SRAM product line, engineered specifically for cost-sensitive, 5 V embedded systems needing fast, low-power, pin-compatible memory expansion without voltage translation.

FAQ

What is the maximum operating current for CY7C199C-12VXI at 12 ns speed?

The maximum operating supply current (ICC) is 85 mA under worst-case conditions: VCC = 5.5 V, IOUT = 0 mA, and f = 1/tRC = 83.3 MHz. This value is measured with all outputs unloaded and reflects peak dynamic power during continuous read/write cycling.

Does CY7C199C-12VXI support automatic power-down in both TTL and CMOS input modes?

Yes - it supports two distinct power-down modes: ISB1 (30 mA max) with TTL-compatible inputs (CE ≥ VIH), and ISB2 (10 µA max) with CMOS inputs (CE ≥ VCC – 0.3 V). The SOJ-packaged -12VXI variant is specified for TTL mode per its commercial temperature rating.

Can CY7C199C-12VXI retain data at 2.0 V while maintaining CE and WE in valid logic states?

Yes - data retention is guaranteed at VCC = 2.0 V when CE ≥ VCC – 0.3 V (i.e., ≥1.7 V) and all inputs are held at valid CMOS levels (≥ VCC – 0.3 V or ≤ 0.3 V). No clock or refresh is required during retention mode.

Is the 28-pin SOJ package of CY7C199C-12VXI RoHS-compliant?

Yes - the -12VXI suffix denotes a lead-free, RoHS-compliant 28-pin SOJ package, verified per Cypress document #38-05408 Rev. *B. It uses matte tin terminations and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) requirements.