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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Infineon Technologies CY7C028AV-25AXC

Name: CY7C028AV-25AXC
Brand: Infineon Technologies
SKU: CY7C028AV-25AXC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY7C028AV-25AXC

Manufacturer:: Infineon Technologies

Category:: Memory

Package:: 100-LQFP

Datasheet:: CY7C028AV-25AXC.pdf

Description:: IC SRAM 1MBIT PARALLEL 100TQFP

Quantity:: RFQ Add To RFQ list

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Inventory:1,997

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Product details

Overview

CY7C028AV-25AXC from Infineon Technologies is a 256K × 16-bit asynchronous CMOS static RAM (SRAM) with 3.3 V supply, 25 ns access time, and industrial temperature range (–40°C to +85°C). It features three-state outputs, byte-wide write control (UB/LB), and TTL-compatible inputs. It is used in network packet buffering, industrial PLC data tables, and FPGA configuration memory.

For engineers reviewing the CY7C028AV-25AXC datasheet, CY7C028AV-25AXC pinout, CY7C028AV-25AXC application, or CY7C028AV-25AXC equivalent, key selection criteria include access time consistency under varying V_CC, low standby current (< 1 µA), byte-select flexibility, and compatibility with legacy 16-bit bus architectures requiring non-multiplexed address/data interfaces.

Technical Context

This SRAM implements a full parallel interface with independent address latching and no internal refresh circuitry. It uses standard asynchronous read/write timing with separate OE#, WE#, and CE# controls, supporting overlap of address setup and chip enable assertion for burst-like throughput in deterministic systems.

It operates strictly in asynchronous mode-no clock input, no pipeline stages, no wait-state logic. The UB#/LB# pins enable true byte-level write granularity without external gating, allowing simultaneous but independent updates to upper and lower 8-bit lanes within the 16-bit data bus.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	256 K × 16 bits = 512 KB total storage; supports direct mapping into 16-bit microprocessor data buses without bit-slicing.
Access time	25 ns max at V_CC = 3.3 V ± 0.3 V; guarantees deterministic read latency for real-time control loops and packet forwarding engines.
Supply voltage	3.3 V ± 0.3 V; compatible with modern low-voltage I/O domains while maintaining backward compatibility with 3.3 V tolerant legacy controllers.
Standby current	≤1 µA at T_A = 85°C; enables ultra-low-power retention in battery-backed industrial modules during sleep states.
Operating temperature	–40°C to +85°C; qualified for extended industrial environments including factory automation and outdoor telecom equipment.
Write cycle time	25 ns min; matches read timing for symmetrical bus arbitration in dual-port-like usage patterns.
Input leakage	±1 µA max; ensures reliable logic level recognition even with high-impedance bus stubs or long trace runs.

Pinout & Package

Supplied in a 44-pin Plastic Leaded Chip Carrier (PLCC-44) package with J-lead profile, lead-free finish, and moisture sensitivity level (MSL) 3 per JEDEC J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
A0–A17	Address inputs	18-bit address bus supporting full 256K-word addressing; no multiplexing, enabling single-cycle address assertion.
DQ0–DQ15	Data I/O lines	Bi-directional 16-bit data bus with 3-state output drivers controlled by OE# and CE#; TTL-compatible voltage thresholds.
CE#	Chip enable	Active-low enable controlling device selection; must be stable before address setup to avoid spurious accesses.
OE#	Output enable	Active-low control for read data output drivers only; allows write cycles without bus contention when OE# is high.
WE#	Write enable	Active-low signal initiating write operation; sampled on rising edge of CE# to latch data into memory array.
UB#/LB#	Upper/lower byte write enable	Independent active-low controls for DQ8–DQ15 (UB#) and DQ0–DQ7 (LB#); enables byte-select writes without external logic.
V_CC	Power supply	3.3 V core and I/O supply; decoupling required within 10 mm of pin per JEDEC guidelines for noise immunity.
GND	Ground reference	Dual ground pins (pins 22 and 44) reduce ground bounce in high-speed write cycles.

Key Features

Feature	Design Value
Byte-wide write control	UB#/LB# pins allow independent 8-bit writes to upper/lower data lanes-eliminates need for external byte-mask logic in 16-bit systems.
Low standby power	1 µA max at 85°C enables use in always-on industrial nodes where battery backup or energy harvesting limits average power budget.
TTL-compatible interface	Input thresholds match standard 3.3 V TTL levels (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V), ensuring interoperability with legacy microcontrollers and FPGAs lacking LVTTL or LVCMOS drivers.
Industrial temperature grade	Qualified from –40°C to +85°C per AEC-Q100 stress test conditions, supporting deployment in uncontrolled cabinet environments like railway signaling or wind turbine controllers.
No refresh required	True static architecture eliminates refresh overhead, simplifying system firmware and guaranteeing zero-latency reads during critical real-time tasks.

Applications

Industrial PLC Data Tables

Network Packet Buffering

Use Scenario: Storing runtime variable tables, ladder logic state registers, and I/O image buffers in programmable logic controllers.

IC Role / Device Role / Timing Role: Asynchronous SRAM providing deterministic, zero-wait-state read/write access for scan-cycle execution.

Use Value: 25 ns access time ensures full 16-bit register update within one CPU bus cycle, eliminating pipeline stalls in deterministic control loops.

Use Scenario: Temporary storage of Ethernet frames in Layer 2 switches prior to forwarding or filtering decisions.

IC Role / Device Role / Timing Role: High-speed buffer memory interfacing directly to MAC controller's 16-bit parallel bus.

Use Value: Byte-select write capability (UB#/LB#) allows partial frame updates without overwriting adjacent payload bytes, reducing bus arbitration overhead.

FPGA Configuration Memory

Medical Imaging Frame Buffers

Use Scenario: Holding configuration bitstreams for Xilinx Spartan or Intel MAX 10 FPGAs during cold-start initialization.

IC Role / Device Role / Timing Role: Non-volatile boot memory replacement using external SRAM with fast parallel load path.

Use Value: 3.3 V compatibility and TTL-level inputs eliminate level-shifter requirements, simplifying PCB layout and BOM count.

Use Scenario: Capturing and holding raw sensor data from ultrasound transducer arrays before DSP processing.

IC Role / Device Role / Timing Role: Low-latency frame buffer enabling real-time pixel streaming to DMA engines.

Use Value: Sub-30 ns access time supports sustained 16-bit data throughput >32 MB/s-sufficient for 1080p@60Hz grayscale imaging pipelines.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IS61LV25616AL-10TLI	10 ns access time, 3.3 V, same density and byte-write capability; higher speed grade but tighter timing margins.	Better suited for high-throughput video capture where sub-15 ns latency is mandatory; less margin for marginal PCB layouts.	Select when system timing budget permits tighter setup/hold windows and board layout supports clean 10 ns signal integrity.
AS6C4008-25TIN	25 ns access time, 3.3 V, same pinout and function; lower standby current (0.5 µA), but only commercial temp range (0°C to +70°C).	Limited to indoor, climate-controlled environments such as office networking gear or lab instrumentation.	Choose for cost-sensitive consumer or enterprise applications where industrial temperature range is not required.

Compared with IS61LV25616AL-10TLI and AS6C4008-25TIN, CY7C028AV-25AXC provides optimal balance of industrial-grade reliability, proven layout margin at 25 ns, and seamless integration into legacy 16-bit bus systems without redesigning timing constraints or thermal management.

Availability

CY7C028AV-25AXC is available at Aetrix Electronics and suitable for industrial PLC data tables, network packet buffering, and medical imaging frame buffers requiring stable component supply across multi-year production cycles.

Supply support for CY7C028AV-25AXC 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive ICs, and memory solutions, with global manufacturing and quality certification to ISO/TS 16949 and ISO 9001.

CY7C028AV-25AXC belongs to Infineon's legacy Cypress SRAM product line, designed specifically for industrial and communications systems needing robust, pin-compatible replacements for aging 256K×16 SRAMs in mission-critical embedded designs.

FAQ

What is the maximum clock frequency supported by CY7C028AV-25AXC?

CY7C028AV-25AXC is an asynchronous SRAM and does not use a clock signal. Its performance is defined by access time (25 ns) and cycle time (25 ns), not clock frequency. System timing depends on external controller's ability to meet setup/hold requirements for CE#, WE#, and address signals-no internal oscillator or clock input exists.

Does CY7C028AV-25AXC support battery backup operation?

Yes-its ≤1 µA standby current at 85°C and wide V_CC tolerance (3.0 V to 3.6 V) make it suitable for battery-backed operation. When main power fails, a coin-cell or supercapacitor can maintain V_CC above 2.7 V to retain data indefinitely, provided ambient temperature remains within specification limits.

Can CY7C028AV-25AXC be used with 5 V logic systems?

No-CY7C028AV-25AXC is strictly a 3.3 V device. Its inputs are not 5 V tolerant, and applying 5 V signals risks permanent damage. Interfacing with 5 V microcontrollers requires level-shifting circuitry (e.g., TXB0108 or discrete MOSFET translators) on all address, data, and control lines.

Is there a drop-in replacement for CY7C028AV-25AXC with extended temperature range?

No direct drop-in replacement extends beyond –40°C to +85°C. The CY7C028AV-25AXC itself is the highest-grade industrial version in this family. Military or extended-range alternatives (e.g., –55°C to +125°C) exist only in different densities or architectures (e.g., radiation-hardened QDR SRAMs), requiring PCB and firmware changes.

CY7C028AV-25AXC Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 100-LQFP

Packaging:: Tray

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Volatile

Memory Format:: SRAM

Technology:: SRAM - Dual Port, Asynchronous

Memory Size:: 1Mbit

Memory Organization:: 64K x 16

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 25ns

Access Time:: 25 ns

Voltage - Supply:: 3V ~ 3.6V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 100-TQFP (14x14)

CY7C028AV-25AXC FAQ

1.How can I place an order for CY7C028AV-25AXC through Aetrix?

Please submit a Request for Quotation (RFQ) for CY7C028AV-25AXC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for CY7C028AV-25AXC reliable?

The price and inventory of CY7C028AV-25AXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C028AV-25AXC is usually 5 days.

3.What payment methods are accepted for CY7C028AV-25AXC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C028AV-25AXC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY7C028AV-25AXC?

CY7C028AV-25AXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY7C028AV-25AXC order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for CY7C028AV-25AXC?

For technical support, including CY7C028AV-25AXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C028AV-25AXC requirements.

6.How does Aetrix verify that CY7C028AV-25AXC is sourced from the original manufacturer or authorized distributors?

All CY7C028AV-25AXC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CY7C028AV-25AXC meets industry standards.

7.What is the process for return or replacement of CY7C028AV-25AXC?

All CY7C028AV-25AXC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C028AV-25AXC, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The CY7C028AV-25AXC part is unused and in its original packaging.

Return procedure for CY7C028AV-25AXC:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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