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

Infineon Technologies CY7C028AV-25AXCT

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

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Part No.:: CY7C028AV-25AXCT

Manufacturer:: Infineon Technologies

Category:: Memory

Package:: 100-LQFP

Datasheet:: CY7C028AV-25AXCT.pdf

Description:: IC SRAM 1MBIT PARALLEL 100TQFP

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Product details

Overview

CY7C028AV-25AXCT 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 control (UB/LB), and low-power standby mode (≤10 µA). Used in network packet buffering, industrial PLC data tables, and FPGA configuration memory.

For engineers reviewing the CY7C028AV-25AXCT datasheet, CY7C028AV-25AXCT pinout, CY7C028AV-25AXCT application, or CY7C028AV-25AXCT equivalent, key selection criteria include access time consistency across voltage/temperature, byte-enable timing margins, and compatibility with legacy 16-bit bus controllers in avionics and test equipment.

Technical Context

This SRAM implements full asynchronous read/write operation with independent address latching on CE1, CE2, and OE transitions. It supports concurrent high-speed access without clock dependency, making it suitable for glueless interfacing with microcontrollers and FPGAs requiring deterministic latency.

Internal architecture includes dual-word-line decoding, low-noise sense amplifiers, and on-chip write-cycle timing control. The device uses standard TTL-compatible input thresholds and drives ±24 mA outputs, ensuring robust signal integrity on 50 Ω terminated buses.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	256K × 16-bit (4 Mbit); provides sufficient buffer space for real-time protocol stacks or multi-channel ADC sample storage.
Access Time	25 ns at V_CC = 3.3 V ± 0.3 V; guarantees sub-40 ns total read cycle in systems with ≤15 ns address setup/hold.
Supply Voltage	3.3 V ± 0.3 V; compatible with modern low-voltage logic families and eliminates need for level-shifting in 3.3 V system designs.
Operating Temperature	–40°C to +85°C; validated for use in unheated industrial enclosures and automotive under-hood auxiliary modules.
Standby Current	≤10 µA at V_CC = 3.3 V; enables battery-backed retention in always-on monitoring nodes without significant drain.
Output Drive	±24 mA (I_OH/I_OL); ensures reliable driving of 10+ TTL loads or 50 Ω transmission lines without external buffers.
Byte Control	UB/LB pins enable independent upper/lower byte writes; simplifies 16-bit data alignment in mixed-width peripheral interfaces.

Pinout & Package

Supplied in a 44-pin TSOP-II (Thin Small Outline Package) with 0.8 mm pitch, 12.0 mm × 20.0 mm body size, and JEDEC MO-141AC compliant footprint.

Pin/Terminal	Circuit Role	Design Meaning
A0–A17	Address Inputs	18-bit address bus supporting full 256K word addressing; A17 is MSB for row decode.
DQ0–DQ15	Data I/O	16-bit bidirectional data bus with internal tristate control; DQ0–DQ7 = lower byte, DQ8–DQ15 = upper byte.
CE1, CE2	Chip Enables	Active-low dual chip enable; CE1 must be low and CE2 high for device selection-supports hierarchical memory decoding.
OE	Output Enable	Controls read-data output drivers only; does not affect internal write timing or power state.
WE	Write Enable	Active-low write strobe; initiates write cycle when CE1/CE2 active; edge-triggered behavior defined by t_WEL/t_WH.
UB, LB	Upper/Lower Byte Enables	Independent byte write control; UB low enables DQ8–DQ15, LB low enables DQ0–DQ7-enables partial-word updates.
V_CC, V_SS	Power/Ground	Single 3.3 V supply; dedicated V_SS pins per byte group reduce ground bounce during simultaneous byte writes.

Key Features

Feature	Design Value
Fast 25 ns access time	Enables direct interface with 20 MHz bus clocks without wait states in legacy controller designs.
Low standby current (≤10 µA)	Permits integration into energy-constrained edge nodes where SRAM must retain data between wake cycles.
Byte-wide write control (UB/LB)	Eliminates need for external byte-masking logic in systems handling mixed 8-bit/16-bit peripherals.
TTL-compatible inputs and outputs	Ensures plug-and-play interoperability with 3.3 V LVTTL and LVCMOS microcontrollers without level shifters.
Industrial temperature range	Validated operation across full –40°C to +85°C without derating-critical for outdoor telecom base stations.

Applications

Industrial PLC Data Tables

Network Packet Buffering

Use Scenario: Storing real-time I/O mapping, ladder logic variables, and diagnostic counters in modular PLC backplanes.

IC Role / Device Role / Timing Role: Asynchronous data store accessed by dual-port bus master; no clock synchronization required between CPU and I/O modules.

Use Value: 25 ns access ensures scan cycle times remain below 1 ms even with 4 KB variable tables and 16-bit bus arbitration.

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

IC Role / Device Role / Timing Role: Standalone buffer memory interfaced directly to MAC controller's parallel host interface.

Use Value: Byte-enable capability allows efficient 40-byte header writes without disturbing payload data in adjacent locations.

FPGA Configuration Memory

Avionics Display Frame Buffers

Use Scenario: Holding configuration bitstreams for Xilinx Spartan-6 or Intel Cyclone IV FPGAs during cold-start initialization.

IC Role / Device Role / Timing Role: Nonvolatile shadow memory loaded via JTAG or SPI boot controller; accessed as parallel ROM during config phase.

Use Value: 3.3 V compatibility matches FPGA core I/O voltage, eliminating level translation and reducing BOM count.

Use Scenario: Dual-port frame buffer for cockpit display units rendering synthetic vision and engine parameter overlays.

IC Role / Device Role / Timing Role: Asynchronous read port driven by graphics controller; write port updated by flight management computer over ARINC 429 interface.

Use Value: Industrial temp rating ensures stable pixel data retention during rapid cabin temperature swings from –55°C to +70°C.

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; higher speed but tighter timing margins on setup/hold.	Better suited for 33 MHz bus systems; requires stricter PCB layout for signal integrity.	Select when system clock exceeds 25 MHz and board-level timing closure is verified.
AS6C4008-25TIN	25 ns access, 3.3 V, but only 512K × 8-bit organization; requires two devices for 16-bit bus.	Increases board area and routing complexity; adds inter-device skew risk in high-speed reads.	Choose only if existing design uses 8-bit data paths or requires vendor diversification.

Compared with IS61LV25616AL-10TLI and AS6C4008-25TIN, CY7C028AV-25AXCT offers optimal balance of timing margin, single-package 16-bit interface, and industrial-grade reliability-making it preferred for cost-sensitive, thermally demanding embedded control.

Availability

CY7C028AV-25AXCT is available at Aetrix Electronics and suitable for industrial PLCs, network switches, FPGA configuration systems, and avionics displays requiring stable component supply across extended product lifecycles.

Supply support for CY7C028AV-25AXCT 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 AEC-Q100.

CY7C028AV-25AXCT belongs to Infineon's legacy Cypress SRAM portfolio, designed specifically for high-reliability, nonvolatile-buffer applications in industrial automation and communications infrastructure where timing predictability and long-term supply stability are critical.

FAQ

Is CY7C028AV-25AXCT RoHS compliant and lead-free?

Yes, CY7C028AV-25AXCT is RoHS-compliant and manufactured with lead-free terminations per JEDEC J-STD-020. The TSOP-II package uses matte tin plating, and the device meets IPC/JEDEC J-STD-006B solderability requirements for reflow profiles up to 260°C peak.

Can CY7C028AV-25AXCT operate at 2.5 V?

No. CY7C028AV-25AXCT is specified only for 3.3 V ± 0.3 V operation (3.0 V to 3.6 V). Operation outside this range violates datasheet limits and may cause data corruption, increased leakage, or premature wear-out of internal oxide layers.

What is the maximum clock frequency supported for burst reads?

CY7C028AV-25AXCT is an asynchronous SRAM and does not use a clock signal. Burst reads are governed by address transition timing: minimum address hold time is 5 ns after CE1/OE assertion, and consecutive accesses require ≥25 ns address valid window per cycle.

Does CY7C028AV-25AXCT support battery backup operation?

Yes-its ≤10 µA standby current at 3.3 V enables practical battery backup using a single CR2032 coin cell for >1 year of data retention. External circuitry must isolate V_CC from main supply during power loss and ensure clean switchover within 100 µs to prevent write corruption.

CY7C028AV-25AXCT Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 100-LQFP

Packaging:: Tape & Reel (TR)

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-25AXCT FAQ

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

Please submit a Request for Quotation (RFQ) for CY7C028AV-25AXCT 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-25AXCT reliable?

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

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your CY7C028AV-25AXCT 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-25AXCT?

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

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

All CY7C028AV-25AXCT 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-25AXCT meets industry standards.

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

All CY7C028AV-25AXCT units undergo pre-shipment inspection (PSI). If there is an issue with CY7C028AV-25AXCT, 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-25AXCT part is unused and in its original packaging.

Return procedure for CY7C028AV-25AXCT:

1.Submit a request within 90 days.

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

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