Infineon Technologies CY7C1049BL-17VC

Overview

CY7C1049BL-17VC from Cypress Semiconductor is a 512K × 8 (4-Mbit) high-speed CMOS static RAM with 17 ns maximum access time, TTL-compatible I/O, automatic CE-controlled power-down, and 2.0V data retention capability. It operates at 4.5–5.5V over 0°C to +70°C and is used in embedded controllers, industrial PLCs, and legacy telecom line cards requiring non-volatile SRAM hold during brownout.

For engineers reviewing the CY7C1049BL-17VC datasheet, CY7C1049BL-17VC pinout, CY7C1049BL-17VC application, or CY7C1049BL-17VC equivalent, key selection criteria include tAA = 17 ns read timing, ISB2 ≤ 0.5 mA CMOS standby current, VDR = 2.0V retention voltage, and SOJ-36 package compatibility with legacy board layouts.

Technical Context

The CY7C1049BL-17VC implements a full asynchronous SRAM architecture with independent address decoding for 524,288 × 8-bit storage, using three-state bidirectional I/O drivers and dual enable control (CE# and OE#) for seamless memory expansion. Its internal voltage regulator steps 5V down to 3.3V for core logic, enabling stable operation across supply variation.

Power management is handled via automatic CE#-driven transition into low-power retention mode (ISB2 = 0.5 mA max), with data preserved at VCC = 2.0V. Input thresholds meet TTL levels (VIH ≥ 2.2V, VIL ≤ 0.3V), and output drive complies with IOH = –4.0 mA / IOL = 8.0 mA specifications under worst-case conditions.

Key Specifications

Pinout & Package

The CY7C1049BL-17VC is housed in a 36-pin SOJ (Small Outline J-lead) package, 400-mil wide, with center power/ground pinout configuration optimized for thermal dissipation and PCB layout symmetry.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV5128AL-17TI and CY7C1049B-17VC, the CY7C1049BL-17VC uniquely delivers 2.0V data retention and 0.5 mA standby current in a drop-in 5V SOJ-36 footprint-making it the sole choice for legacy 5V systems needing robust brownout resilience without redesign.

Availability

CY7C1049BL-17VC is available at Aetrix Electronics and suitable for industrial PLCs, legacy telecom line cards, and medical instrumentation requiring stable component supply with long-term lifecycle support and consistent SOJ-36 packaging.

Supply support for CY7C1049BL-17VC 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, PSoC, and USB solutions, with design centers in California and global manufacturing partnerships.

The CY7C1049B series was developed for high-reliability, pin-compatible replacement of aging 5V SRAMs in industrial and telecom infrastructure, emphasizing backward compatibility, low-power retention, and JEDEC-standard SOJ packaging.

FAQ

What is the minimum VCC required to retain data in CY7C1049BL-17VC?

The CY7C1049BL-17VC guarantees data retention down to exactly 2.0V (VDR = 2.0V) with ICCDR ≤ 200 µA under commercial L conditions. Below 2.0V, data loss is not characterized and must be avoided. This specification is verified per datasheet page 6, Table "Data Retention Characteristics", and applies only when CE# is held HIGH and all inputs are at valid logic levels.

Can CY7C1049BL-17VC be used with a 3.3V microcontroller interface?

No - the CY7C1049BL-17VC requires a 4.5–5.5V VCC supply and features TTL-compatible inputs (VIH ≥ 2.2V, VIL ≤ 0.3V), but its outputs swing to 5V logic levels. Direct connection to 3.3V-only I/O ports risks damage or latch-up unless level-shifting circuitry (e.g., TXB0108 or discrete MOSFET translators) is implemented per Cypress Application Note AN1084.

How does the automatic power-down feature activate?

Automatic power-down activates when CE# is driven HIGH while all address and control inputs (A0–A18, OE#, WE#) remain at valid CMOS logic levels (≥ VCC – 0.3V or ≤ 0.3V). Under this condition, ISB2 drops to ≤ 0.5 mA. The feature does not require external sequencing - it is fully internal and occurs within tPD = 17 ns after CE# goes HIGH.

Are A10 and A11 pins functional or no-connect?

A10 and A11 are explicitly designated as No Connect (NC) pins per the "Pin Configuration" diagram on page 2 and the "Ordering Information" table on page 9 of datasheet 38-05169 Rev. *A. They must remain unconnected on PCB layout; routing traces or pulling them to any voltage violates the device's electrical specification and may cause undefined behavior or increased leakage.