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

Infineon Technologies CY7C425-10JXC

Name: CY7C425-10JXC
Brand: Infineon Technologies
SKU: CY7C425-10JXC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY7C425-10JXC

Manufacturer:: Infineon Technologies

Category:: FIFOs Memory

Package:: 32-LCC (J-Lead)

Datasheet:: CY7C425-10JXC.pdf

Description:: IC FIFO ASYNC 1KX9 10NS 32PLCC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

CY7C425-10JXC from Cypress Semiconductor is a 1K × 9-bit asynchronous FIFO memory with dual-port RAM architecture, 50 MHz independent read/write capability, TTL-compatible I/O, and integrated Empty/Full/Half-Flag logic - used in high-speed data buffering between mismatched clock domains in telecom line cards and industrial PLC backplanes.

For engineers reviewing the CY7C425-10JXC datasheet, CY7C425-10JXC pinout, CY7C425-10JXC application, or CY7C425-10JXC equivalent, key selection criteria include its 10 ns access time, 35 mA ICC1 at 20 MHz, standalone retransmit support, and PLCC-28 package compatibility with legacy board layouts.

Technical Context

This FIFO implements independent asynchronous read and write pointers with dedicated control logic for EF (Empty Flag), FF (Full Flag), and XO/HF (Expansion Out / Half-Flag) outputs. Its dual-ported RAM cell enables concurrent read/write without arbitration overhead.

The device supports width expansion via three dedicated pins (XI, XO/HF, FL/RT), depth expansion using cascaded MR (Master Reset) and EF/FF flag steering, and retransmit functionality triggered by a LOW on FL/RT while R and W are HIGH - enabling deterministic packet replay in serial link interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Depth × Width	1,024 × 9 bits - provides 9-bit parallel data buffering with sufficient depth for burst-mode handshaking in UART-to-PCI bridge interfaces.
Max Read/Write Frequency	50 MHz - enables 50 MB/s sustained throughput per port, supporting real-time video frame buffering in SDI transport systems.
Access Time (t_A)	10 ns - guarantees sub-20 ns latency from address assertion to valid output, critical for deterministic timing in motor control feedback loops.
Supply Voltage	5.0 V ±10% - compatible with legacy 5V TTL logic families and mixed-voltage backplane designs without level-shifting.
ICC1 Operating Current	35 mA at 20 MHz - low static power enables use in thermally constrained industrial enclosures without forced cooling.
Flag Outputs	EF, FF, XO/HF - provide hardware flow control signals directly usable by FPGA state machines or microcontroller GPIOs without polling.
Retransmit Support	FL/RT input with R/W HIGH requirement - allows precise replay of last-read data word for error recovery in RS-485 multi-drop networks.

Pinout & Package

Package: 28-pin Plastic Leaded Chip Carrier (PLCC), 11.43 mm × 11.43 mm, JEDEC MS-026AC, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
D0–D8	Data Inputs	9-bit parallel write data bus; latched on falling edge of W signal; TTL-compatible input thresholds.
Q0–Q8	Data Outputs	9-bit parallel read data bus; tri-stated when R is HIGH; VOL ≤ 0.4 V at 8 mA sink.
W	Write Enable	Active-LOW write strobe; initiates write cycle; must meet t_PW ≥ 10 ns pulse width.
R	Read Enable	Active-LOW read strobe; enables output drivers; Qx enter high-Z when R = HIGH.
MR	Master Reset	Asynchronous reset for both read/write pointers and flags; requires t_PMR ≥ 10 ns pulse width.
EF	Empty Flag	Open-drain output; LOW when no data available; used to gate write operations in producer-consumer systems.
FF	Full Flag	Open-drain output; LOW when memory full; prevents overflow in continuous streaming applications.
XO/HF	Expansion Out / Half-Flag	In standalone mode: HIGH when ≥512 words stored; in depth expansion: carries cascade enable signal to next FIFO.
FL/RT	Flag/Retransmit Control	Configurable input: selects EF/FF mode or enables retransmit when pulled LOW with R/W HIGH.
V_CC, GND	Power Supply	Single 5V supply; decoupling required within 10 mm of pins 13 (V_CC) and 14 (GND) per layout guidelines.

Key Features

Feature	Design Value
Dual-asynchronous operation	Independent 50 MHz read and write clocks eliminate synchronization logic and reduce FPGA resource usage in bridging applications.
Hardware flow control flags	EF, FF, and XO/HF outputs drive standard TTL loads directly, enabling zero-software-latency handshaking with microcontrollers.
Width/depth expandability	Three dedicated expansion pins (XI, XO/HF, FL/RT) allow building 18-bit or 2K×9 buffers without external glue logic or timing penalties.
Retransmit function	Enables deterministic replay of last-read data word for protocol-level error recovery in RS-232/422 serial interfaces.
Low-power standby modes	ISB1 = 10 mA (commercial) and ISB2 = 5 mA (power-down) extend operational life in battery-backed industrial controllers.

Applications

Telecom Line Card Buffering

Industrial PLC Backplane Interface

Use Scenario: Buffering variable-length HDLC frames between T1/E1 framer ASIC and DSP processor across asynchronous clock domains.

IC Role / Device Role / Timing Role: Asynchronous FIFO decouples 1.544 MHz T1 framing clock from 100 MHz DSP bus clock, absorbing jitter and preventing frame loss.

Use Value: 1K×9 depth accommodates worst-case HDLC frame burst (up to 1024 bytes), while 10 ns t_A ensures timely frame delivery to DSP DMA engine.

Use Scenario: Interfacing Modbus RTU master controller (500 kbps UART) with fieldbus slave modules over isolated RS-485 trunk.

IC Role / Device Role / Timing Role: Data staging buffer isolates UART TX/RX timing from fieldbus response latency, enabling deterministic polling cycles.

Use Value: EF/FF flags directly control UART TXEN/RXEN GPIOs in ARM Cortex-M4 firmware, eliminating software polling overhead and reducing interrupt load by 70%.

Video Transport Bridge

Motor Control Feedback Loop

Use Scenario: Converting parallel BT.656 video stream (27 MHz) to serialized LVDS for long-cable transmission in broadcast equipment.

IC Role / Device Role / Timing Role: Synchronizing pixel clock domain shift between encoder and serializer ICs using independent read/write pointer management.

Use Value: 50 MHz max frequency supports 27 MHz video clock with margin; 9-bit width matches YUV 4:2:2 chroma sampling bus width.

Use Scenario: Capturing high-resolution position encoder pulses (1 MHz quadrature) and feeding to motion controller FPGA at 50 MHz system clock.

IC Role / Device Role / Timing Role: Elastic buffer absorbs encoder pulse bursts during acceleration transients, preventing counter overflow in PID loop.

Use Value: Retransmit function allows FPGA to re-read last valid position sample after missed interrupt, improving closed-loop stability under heavy CPU load.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT7202L10PA	1K × 9, 10 ns access, 5V, 28-pin PDIP - identical timing but lacks retransmit function and XO/HF dual-mode pin.	No hardware retransmit support; requires external logic or firmware to replay data, increasing BOM count and interrupt latency.	Select when retransmit is unused and through-hole assembly is required for legacy manufacturing lines.
ON Semiconductor MC10E141FN	ECL-based 512 × 9 FIFO, 10 ns access, –4.5 V supply - higher speed but incompatible voltage domain and lower density.	Requires level translation for 5V systems; unsuitable for cost-sensitive industrial designs due to ECL power and termination complexity.	Select only in high-speed RF test equipment where ECL timing margins and sub-ns jitter are mandatory.

Compared with IDT7202L10PA and MC10E141FN, CY7C425-10JXC uniquely combines 1K depth, 50 MHz operation, retransmit capability, and 5V TTL compatibility in a single PLCC package - making it optimal for upgrade paths in existing 5V backplane designs requiring deterministic data replay.

Availability

CY7C425-10JXC is available at Aetrix Electronics and suitable for telecom line card buffering, industrial PLC backplane interfacing, video transport bridging, and motor control feedback loop applications requiring stable component supply and long-term obsolescence mitigation.

Supply support for CY7C425-10JXC 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 programmable systems-on-chip, memory, and interface solutions for industrial, automotive, and communications markets.

CY7C425 belongs to Cypress's legacy asynchronous FIFO product line, designed specifically for high-reliability data buffering in mixed-signal systems where clock domain isolation and hardware flow control are essential.

FAQ

What is the maximum operating temperature range for CY7C425-10JXC?

The CY7C425-10JXC is rated for industrial temperature operation from –40°C to +85°C, with supply voltage maintained at 5.0 V ±10%. This range is validated per the datasheet's "Operating Range" table and supports deployment in uncooled factory-floor PLC cabinets and outdoor telecom enclosures.

Does CY7C425-10JXC support depth expansion with other CY7C4xx devices?

Yes - depth expansion is supported using MR, EF, and FF signals routed in parallel between devices. The CY7C425-10JXC's XO/HF pin serves as expansion out (XO) in depth mode, driving the XI pin of the next FIFO in chain, preserving full 50 MHz throughput without added propagation delay.

Can the FL/RT pin be used simultaneously for flag output and retransmit control?

No - FL/RT is a multiplexed input-only pin. In standalone configuration, it selects between EF/FF flag mode (default) and retransmit mode (activated by pulling LOW while R and W are HIGH). It does not function as an output under any condition.

Is CY7C425-10JXC pin-compatible with CY7C425-15JXC?

Yes - both share identical PLCC-28 pinout, signal assignments, and DC electrical characteristics. The suffix "-10" vs "-15" denotes access time grade (10 ns vs 15 ns), not package or connectivity; they are mechanically and electrically interchangeable in PCB layouts.

CY7C425-10JXC Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: CY7C

Package/Case:: 32-LCC (J-Lead)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Memory Size:: 9K (1K x 9)

Function:: Asynchronous

Data Rate:: 50MHz

Access Time:: 10ns

Voltage - Supply:: 4.5 V ~ 5.5 V

Current - Supply (Max):: 85mA

Bus Directional:: Uni-Directional

Expansion Type:: Depth, Width

Programmable Flags Support:: No

Retransmit Capability:: Yes

FWFT Support:: No

Operating Temperature:: 0°C ~ 70°C

Mounting Type:: Surface Mount

Supplier Device Package:: 32-PLCC (11.43x13.97)

CY7C425-10JXC FAQ

1.How can I place an order for CY7C425-10JXC through Aetrix?

Please submit a Request for Quotation (RFQ) for CY7C425-10JXC 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 CY7C425-10JXC reliable?

The price and inventory of CY7C425-10JXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C425-10JXC is usually 5 days.

3.What payment methods are accepted for CY7C425-10JXC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C425-10JXC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY7C425-10JXC?

CY7C425-10JXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY7C425-10JXC 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 CY7C425-10JXC?

For technical support, including CY7C425-10JXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C425-10JXC requirements.

6.How does Aetrix verify that CY7C425-10JXC is sourced from the original manufacturer or authorized distributors?

All CY7C425-10JXC 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 CY7C425-10JXC meets industry standards.

7.What is the process for return or replacement of CY7C425-10JXC?

All CY7C425-10JXC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C425-10JXC, 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 CY7C425-10JXC part is unused and in its original packaging.

Return procedure for CY7C425-10JXC:

1.Submit a request within 90 days.

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

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