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Infineon Technologies CY7C4255-10AXC
- Part No.:
- CY7C4255-10AXC
- Manufacturer:
- Infineon Technologies
- Category:
- FIFOs Memory
- Package:
- 64-LQFP
- Datasheet:
-
CY7C4255-10AXC.pdf
- Description:
- IC FIFO SYNC 8KX18 8NS 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,110
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Product details
Overview
CY7C4255-10AXC from Cypress Semiconductor is an 8K × 18-bit, high-speed asynchronous FIFO memory with TTL-compatible I/O, 100 MHz operation (10 ns read/write cycle), 45 mA active supply current, and programmable Almost Empty/Almost Full flags. It serves as a data buffering interface between mismatched-speed subsystems in high-speed data acquisition and communications systems.
For engineers reviewing the CY7C4255-10AXC datasheet, CY7C4255-10AXC pinout, CY7C4255-10AXC application, or CY7C4255-10AXC equivalent, key selection criteria include synchronous/asynchronous flag timing control (via VCC/SMODE), depth/width expansion capability using WXO/RXO cascading pins, retransmit functionality, and 64-pin TQFP package compatibility with IDT72205-series FIFOs.
Technical Context
The CY7C4255-10AXC implements a dual-clock, fully asynchronous FIFO architecture with independent WCLK/REN and RCLK/WEN control paths, enabling simultaneous read/write at up to 100 MHz. Its 8K × 18-bit SRAM core supports programmable flag offsets via LD-controlled register writes.
Status logic delivers five synchronized flags - EF (RCLK-synchronized), FF (WCLK-synchronized), HF (shared WXO pin), PAE, and PAF - with configurable synchronization mode selected by VCC/SMODE pin voltage. Cascade I/O (WXI/WXO, RXI/RXO, FL/RT) enables depth expansion across multiple devices with deterministic first-load sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 8K × 18 bits - provides 144 Kbit buffer capacity for burst-mode data streams |
| Max Clock Frequency | 100 MHz - supports 10 ns minimum read/write cycle time for high-throughput interfaces |
| Active Supply Current | 45 mA (Commercial) - enables low-power system-level buffering without thermal derating |
| Flag Synchronization | VCC/SMODE-selectable - synchronous (to RCLK/WCLK) or asynchronous operation for timing-critical status monitoring |
| Expansion Interface | WXO/HF, RXO, WXI, RXI, FL/RT - enables daisy-chained depth expansion with deterministic initialization |
| Retransmit Function | Strobed via FL/RT pin - allows repeat output of last-read data without re-reading FIFO core |
| Package | 64-pin TQFP (10 mm × 10 mm, 0.5 mm pitch) - surface-mount compatible with industrial PCB assembly |
Pinout & Package
64-pin Thin Quad Flat Package (TQFP) with center power/ground pins for noise reduction and 0.5 mm lead pitch. Pin 1 marked by dot; top view shown in datasheet Figure 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D17 | Data Input Bus | 18-bit parallel input path clocked on WCLK rising edge when WEN = LOW |
| Q0–Q17 | Data Output Bus | 18-bit parallel output path clocked on RCLK rising edge when REN = LOW and OE = LOW |
| WCLK / RCLK | Independent Clock Inputs | Free-running clocks support asynchronous operation; may be tied for single-clock mode |
| WEN / REN | Enable Controls | Gate write/read operations independently - critical for handshaking with variable-rate peripherals |
| WXO/HF | Dual-Mode Terminal | In standalone mode: Half Full flag output; in cascade: Write Expansion Out signal to next device |
| FL/RT | First Load / Retransmit | In cascade: FL selects first device (tied to VSS); standalone: RT strobe triggers retransmit of last valid Q-word |
| VCC/SMODE | Flag Sync Mode Select | Tied to VCC → asynchronous PAE/PAF; tied to VSS → RCLK/WCLK-synchronized flags |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Almost Empty/Full Flags | Offset values set via LD-controlled register write - enables custom buffer threshold management for flow control |
| Retransmit Function | Single-cycle RT strobe repeats last-read word - eliminates need for external latch in protocol retry scenarios |
| Center Power/Ground Pins | Reduced switching noise and improved signal integrity - critical for stable flag timing in mixed-signal environments |
| Width/Depth Expansion Capability | WXO/RXO cascading with FL/RT sequencing - supports scalable buffer sizes without redesigning controller logic |
| TTL-Compatible I/O | VIH ≥ 2.0 V, VOL ≤ 0.4 V - interoperable with legacy 5 V logic families without level-shifting |
Applications
| High-Speed Data Acquisition | Multiprocessor Interfacing |
|---|---|
|
Use Scenario: Capturing real-time sensor data from ADCs running at 100 MSPS into a slower host processor. IC Role / Device Role / Timing Role: Asynchronous FIFO buffer decoupling high-speed sampling clock (WCLK) from host read clock (RCLK). Use Value: Prevents data loss during host interrupt latency; 8K depth accommodates worst-case burst capture before servicing. |
Use Scenario: Sharing memory-mapped data between two CPUs operating at different clock domains. IC Role / Device Role / Timing Role: Dual-port bridge with independent read/write enable controls and synchronized EF/FF flags for handshake signaling. Use Value: Eliminates arbitration logic; programmable PAE/PAF enables adaptive flow control based on CPU load. |
| Serial Communications Buffering | Video Frame Synchronization |
|
Use Scenario: Buffering UART or SPI packets between a microcontroller and modem IC with variable transmit/receive rates. IC Role / Device Role / Timing Role: Data rate translator using retransmit (RT) for packet resend on CRC failure. Use Value: Reduces firmware overhead; OE-controlled three-state outputs allow shared bus topology with other peripherals. |
Use Scenario: Aligning pixel data streams between camera sensor (MIPI CSI-2) and display controller (LVDS) with differing frame rates. IC Role / Device Role / Timing Role: Frame-level buffer with Half Full (HF) flag used to trigger DMA reload and minimize jitter. Use Value: WXO/HF pin provides deterministic mid-buffer indicator - enables precise timing of display refresh cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO buffering applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT72205L10JGI | 8K × 18, 100 MHz, 64-pin TQFP, but lacks retransmit function and FL/RT dual-mode pin | No native retransmit capability - requires external logic for packet retry handling | Select when retransmit is unnecessary and legacy IDT footprint compatibility is required |
| CY7C425-10JC | Same 8K × 18 density and 100 MHz speed, but 56-pin SOIC package - no cascade expansion pins (WXI/RXI/RXO/WXO) | Not suitable for depth-expanded configurations; limited to standalone or width-expansion only | Select for space-constrained PCBs where expansion is not needed and through-hole mounting is preferred |
Compared with IDT72205L10JGI and CY7C425-10JC, the CY7C4255-10AXC uniquely integrates retransmit, full cascade I/O, and VCC/SMODE flag synchronization - making it optimal for scalable, protocol-aware buffering in industrial and telecom infrastructure.
Availability
CY7C4255-10AXC is available at Aetrix Electronics and suitable for high-speed data acquisition, multiprocessor interfacing, serial communications buffering, and video frame synchronization requiring stable component supply and long-term industrial temperature support.
Supply support for CY7C4255-10AXC 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) designs high-performance memory and programmable logic solutions for industrial, automotive, and communications markets.
The CY7C42XX FIFO family targets high-speed, low-latency data buffering in mixed-clock-domain systems - emphasizing expandability, flag flexibility, and robust asynchronous operation.
FAQ
What is the function of the VCC/SMODE pin on CY7C4255-10AXC?
The VCC/SMODE pin selects synchronization mode for the Programmable Almost Empty (PAE) and Programmable Almost Full (PAF) flags. When tied to VCC, PAE/PAF operate asynchronously; when tied to VSS, PAE synchronizes to RCLK and PAF to WCLK - ensuring deterministic flag timing relative to respective clock domains.
How does the retransmit (RT) function work in standalone mode?
In standalone mode, the FL/RT pin operates as Retransmit (RT). A low-going pulse on RT causes the FIFO to output the last valid word read (Q0–Q17) again on the next RCLK rising edge, without advancing the read pointer - useful for protocol retries without reloading data from upstream sources.
Can CY7C4255-10AXC be used in depth-expanded configurations with CY7C4265A devices?
Yes - CY7C4255-10AXC is pin- and function-compatible with CY7C4265A for depth expansion. The WXO/RXO, WXI/RXI, and FL/RT pins support daisy-chaining; the first device's FL ties to VSS, others to VCC, enabling coordinated initialization and cascaded flag propagation.
What is the purpose of the center power and ground pins in the 64-pin TQFP package?
The center power (VCC) and ground (GND) pins reduce simultaneous switching noise and improve power integrity by shortening current return paths. This layout minimizes ground bounce and ensures stable flag timing - especially critical for high-frequency (100 MHz) asynchronous operation with tight setup/hold margins.
CY7C4255-10AXC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- CY7C
- Package/Case:
- 64-LQFP
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 144K (8K x 18)
- Function:
- Synchronous
- Data Rate:
- 100MHz
- Access Time:
- 8ns
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Current - Supply (Max):
- 45mA
- Bus Directional:
- Uni-Directional
- Expansion Type:
- Depth, Width
- Programmable Flags Support:
- Yes
- Retransmit Capability:
- Yes
- FWFT Support:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (14x14)
CY7C4255-10AXC FAQ
1.How can I place an order for CY7C4255-10AXC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C4255-10AXC 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 CY7C4255-10AXC reliable?
The price and inventory of CY7C4255-10AXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C4255-10AXC is usually 5 days.
3.What payment methods are accepted for CY7C4255-10AXC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C4255-10AXC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C4255-10AXC?
CY7C4255-10AXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C4255-10AXC 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 CY7C4255-10AXC?
For technical support, including CY7C4255-10AXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C4255-10AXC requirements.
6.How does Aetrix verify that CY7C4255-10AXC is sourced from the original manufacturer or authorized distributors?
All CY7C4255-10AXC 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 CY7C4255-10AXC meets industry standards.
7.What is the process for return or replacement of CY7C4255-10AXC?
All CY7C4255-10AXC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C4255-10AXC, 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 CY7C4255-10AXC part is unused and in its original packaging.
Return procedure for CY7C4255-10AXC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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