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

Infineon Technologies CY7C028V-25AXCT

Name: CY7C028V-25AXCT
Brand: Infineon Technologies
SKU: CY7C028V-25AXCT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY7C028V-25AXCT

Manufacturer:: Infineon Technologies

Category:: Memory

Package:: 100-LQFP

Datasheet:: CY7C028V-25AXCT.pdf

Description:: IC SRAM 1MBIT PARALLEL 100TQFP

Quantity:: RFQ Add To RFQ list

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Inventory:4,691

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Product details

Overview

CY7C028V-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 write control (UB/LB), and TTL-compatible inputs for embedded memory interfacing in real-time controllers and data buffers.

For engineers reviewing the CY7C028V-25AXCT datasheet, CY7C028V-25AXCT pinout, CY7C028V-25AXCT application, or CY7C028V-25AXCT equivalent, key selection criteria include access timing consistency under varying bus loading, low active power (180 mW typical), and compatibility with legacy 16-bit microprocessor data buses such as those in Motorola 68K and Intel 80C186 systems.

Technical Context

This SRAM operates without clocks or refresh cycles, delivering deterministic read/write latency critical for deterministic real-time firmware execution and FIFO buffering. Its dual-byte write enable (UB/LB) supports independent upper/lower word writes, enabling efficient 8-bit peripheral interfacing on 16-bit buses.

The device uses standard address/data multiplexing-free parallel architecture with separate address latches internally controlled by CE1/CE2 and OE/WE timing. It complies with JEDEC Standard No. 22-A112 for ESD immunity (2000 V HBM) and supports full data retention down to 2.0 V V_CC.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	256 K × 16 bits = 512 KB total storage; sufficient for boot code, stack, and small real-time data buffers in space-constrained controllers.
Access time	25 ns max at V_CC = 3.3 V ± 0.3 V; ensures compatibility with 25 MHz bus timing without wait states in legacy MPU designs.
Supply voltage	3.3 V ± 0.3 V; requires single-supply rail, eliminating need for level shifters when interfacing with 3.3 V logic families.
Operating temperature	–40°C to +85°C; qualified for industrial environments including motor drives and PLC I/O modules.
Power dissipation	180 mW typical active, 1 µW max standby; enables low-heat operation in sealed enclosures without forced cooling.
Input/output interface	TTL-compatible inputs, 3-state CMOS outputs; directly interfaces with 3.3 V microcontrollers and FPGAs without translation logic.

Pinout & Package

Supplied in a 44-pin plastic leaded chip carrier (PLCC) package with J-lead configuration, lead finish SnPb, and body dimensions 16.59 mm × 16.59 mm × 4.57 mm.

Pin/Terminal	Circuit Role	Design Meaning
A0–A17	Address inputs	18-bit address bus supporting full 256K-word addressing; no internal multiplexing required.
DQ0–DQ15	Data I/O bidirectional lines	16-bit parallel data path; high-impedance state activated by CE1/CE2/OE to prevent bus contention.
CE1, CE2	Chip enable inputs	Two-level enable hierarchy: CE1 active-low + CE2 active-high required for device selection; supports bank decoding.
OE	Output enable	Controls output drivers only; read operations possible while WE is high and CE active.
WE	Write enable	Active-low signal initiating write cycle; latches data on rising edge of WE when CE and OE are asserted.
UB, LB	Upper/lower byte write enable	Independent control of DQ8–DQ15 (UB) and DQ0–DQ7 (LB); enables 8-bit peripheral writes on 16-bit bus.
V_CC, V_SS	Power and ground	Single 3.3 V supply; decoupling capacitor placement near pins critical for noise immunity at 25 ns timing.

Key Features

Feature	Design Value
Fast 25 ns access time	Enables zero-wait-state operation with 25 MHz microprocessors like MC68332 and TMS320C54x DSPs.
Byte-wide write control (UB/LB)	Eliminates need for external byte masking logic when interfacing 8-bit peripherals or legacy UARTs.
Low-power CMOS design	Reduces thermal load in multi-SRAM memory subsystems used in industrial HMIs and motion controllers.
Industrial temperature range	Validated operation across full –40°C to +85°C range without derating; suitable for uncooled DIN-rail mounted equipment.
TTL-compatible signaling	Direct connection to 3.3 V FPGA I/O banks and microcontroller GPIO without level-shifting components.

Applications

Industrial PLC Data Buffers

Automotive Engine Control Units

Use Scenario: Storing real-time sensor sampling history and PID calculation scratchpad in modular PLC backplanes.

IC Role / Device Role / Timing Role: Asynchronous SRAM providing deterministic 25 ns read/write latency for cyclic control tasks.

Use Value: Eliminates bus arbitration delays found in DRAM-based buffers, ensuring jitter-free 1 ms control loop execution.

Use Scenario: Holding transient calibration tables and fault log entries in Tier-1 engine management ECUs.

IC Role / Device Role / Timing Role: Non-refresh volatile memory retaining valid data during ignition cycling and cold cranking.

Use Value: Supports fast boot-up (<50 ms) by preserving last-run diagnostics without relying on EEPROM endurance limits.

Medical Imaging Front-End Controllers

Avionics Display Frame Buffers

Use Scenario: Buffering digitized ultrasound A-scan data between ADC and FPGA-based beamformer.

IC Role / Device Role / Timing Role: High-speed parallel SRAM acting as ping-pong buffer for continuous 20 MSPS data flow.

Use Value: 25 ns access enables full utilization of FPGA block RAM bandwidth without pipeline stalls.

Use Scenario: Storing rasterized display frames for HUD and multifunction cockpit displays.

IC Role / Device Role / Timing Role: Dual-port-capable SRAM (via external control logic) supporting simultaneous CPU update and video DAC read.

Use Value: Enables flicker-free overlay rendering using hardware-controlled byte-write (UB/LB) for alpha-blending layers.

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 pinout; higher speed but tighter timing margins.	Better suited for 33 MHz bus systems; requires stricter PCB layout for signal integrity.	Select when system clock exceeds 25 MHz and board layout supports <100 ps skew control.
AS6C4008-25TIN	25 ns access, 3.3 V, but only 256K × 8-bit organization; requires two devices for 16-bit bus.	Increases board area and routing complexity; adds inter-device timing skew risk.	Prefer only if existing design uses 8-bit data paths or requires vendor diversification.

Compared with IS61LV25616AL-10TLI and AS6C4008-25TIN, CY7C028V-25AXCT offers optimal balance of timing margin, single-device 16-bit integration, and industrial qualification-making it ideal for cost-sensitive, reliability-critical embedded systems where 25 ns latency is sufficient.

Availability

CY7C028V-25AXCT is available at Aetrix Electronics and suitable for industrial PLCs, automotive engine control units, medical imaging front-ends, and avionics display systems requiring stable component supply and long-term obsolescence management.

Supply support for CY7C028V-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.

CY7C028V-25AXCT belongs to Infineon's legacy Cypress SRAM product line, designed specifically for industrial and automotive applications demanding high reliability, wide temperature operation, and pin-compatible migration from older 5 V SRAMs.

FAQ

What is the maximum clock frequency supported by CY7C028V-25AXCT?

CY7C028V-25AXCT is an asynchronous SRAM and does not use a clock signal. Its timing is governed by access time (25 ns max) and cycle time (45 ns min), allowing reliable operation with microprocessors running up to 25 MHz without wait states. Bus setup/hold timing must comply with t_AVQV, t_OEHZ, and t_WEH specifications per the datasheet.

Does CY7C028V-25AXCT support battery backup operation?

No, CY7C028V-25AXCT lacks built-in battery-switching circuitry or data retention mode below 2.0 V. It maintains data only while V_CC remains within specification (3.3 V ± 0.3 V). For non-volatile backup, external supervision ICs and battery-backed SRAM controllers are required.

Can CY7C028V-25AXCT be used with 5 V microcontrollers?

Direct connection is not recommended: its inputs are 3.3 V tolerant only (max 4.6 V absolute), and outputs swing 0–3.3 V. Interfacing with 5 V logic requires level translators such as TXB0108 or discrete resistor-divider networks on address/control lines to avoid damage and ensure noise margin.

Is there a lead-free version of CY7C028V-25AXCT?

Yes-the suffix "-25AXCT" denotes RoHS-compliant packaging with lead-free (Pb-free) terminations and halogen-free molding compound. The PLCC package uses matte tin (Sn) plating over copper leads, certified to JEDEC J-STD-020 moisture sensitivity level 3.

CY7C028V-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)

CY7C028V-25AXCT FAQ

1.How can I place an order for CY7C028V-25AXCT through Aetrix?

Please submit a Request for Quotation (RFQ) for CY7C028V-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 CY7C028V-25AXCT reliable?

The price and inventory of CY7C028V-25AXCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C028V-25AXCT is usually 5 days.

3.What payment methods are accepted for CY7C028V-25AXCT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C028V-25AXCT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY7C028V-25AXCT?

CY7C028V-25AXCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY7C028V-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 CY7C028V-25AXCT?

For technical support, including CY7C028V-25AXCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C028V-25AXCT requirements.

6.How does Aetrix verify that CY7C028V-25AXCT is sourced from the original manufacturer or authorized distributors?

All CY7C028V-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 CY7C028V-25AXCT meets industry standards.

7.What is the process for return or replacement of CY7C028V-25AXCT?

All CY7C028V-25AXCT units undergo pre-shipment inspection (PSI). If there is an issue with CY7C028V-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 CY7C028V-25AXCT part is unused and in its original packaging.

Return procedure for CY7C028V-25AXCT:

1.Submit a request within 90 days.

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

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