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Infineon Technologies CY7C025-55AXC
- Part No.:
- CY7C025-55AXC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
CY7C025-55AXC.pdf
- Description:
- IC SRAM 128KBIT PARALLEL 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,836
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Product details
Overview
CY7C025-55AXC from Cypress Semiconductor is an 8K × 16-bit true dual-port static RAM with on-chip arbitration, semaphores, and INT/BUSY flags. It enables simultaneous asynchronous read/write access to shared memory by two independent processors or data paths, supports master/slave expansion to 32-bit bus width, and delivers 55 ns access time at 5 V with 150 mA typical active current. It is used in interprocessor communication buffers and real-time video/graphics frame stores.
For engineers reviewing the CY7C025-55AXC datasheet, CY7C025-55AXC pinout, CY7C025-55AXC application, or CY7C025-55AXC equivalent, key selection criteria include dual-port arbitration behavior, semaphore latch count (8), BUSY flag timing (tBLA/tBLC), M/S pin configuration for master/slave cascading, and compatibility with 5 V TTL logic levels.
Technical Context
The CY7C025-55AXC implements fully asynchronous dual-port architecture with independent CE/R/W/OE control per port and hardware-based arbitration resolving simultaneous access via BUSY assertion. Its 8K × 16-bit memory array (65,536 bits) uses 0.65 µm CMOS technology optimized for speed-power trade-off.
It integrates eight dedicated semaphore latches accessible via SEM pin, supporting software-controlled resource locking across ports. The M/S pin configures BUSY as output (master) or input (slave), enabling seamless 32-bit memory expansion without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 16-bit (131,072 bits total); supports independent 16-bit data access per port |
| Access Time | 55 ns max; defines minimum cycle time for reliable read/write under worst-case 5 V/85°C conditions |
| Operating Voltage | 5 V ±10%; compatible with standard TTL/CMOS 5 V systems without level translation |
| Active Current (ICC) | 150 mA typical; determines power budget for sustained dual-port operation |
| Semaphore Count | 8 dedicated latches; enables concurrent management of up to eight shared resources between ports |
| Arbitration Flags | BUSY and INT per port; BUSY signals contention resolution outcome; INT enables mailbox-style inter-port messaging |
| Package Options | 100-pin TQFP and 84-pin PLCC; both Pb-free compliant; pin-compatible across speed grades |
Pinout & Package
Available in 100-pin Thin Quad Plastic Flatpack (TQFP) and 84-pin Plastic Leaded Chip Carrier (PLCC). Both packages support identical signal mapping and thermal performance for industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left/Right) | Independent port activation; enables automatic power-down when deasserted |
| R/WL / R/WR | Read/Write Control (Left/Right) | Determines direction of data transfer; synchronous with CE and OE for valid cycles |
| OEL / OER | Output Enable (Left/Right) | Gates data bus drivers; allows high-impedance state during contention or idle |
| A0L–A12L / A0R–A12R | Address Inputs (Left/Right) | 13-bit address bus per port; A12 present only on CY7C025/0251 (8K depth) |
| I/O0L–I/O15L / I/O0R–I/O15R | Data Bus (Left/Right) | 16-bit bidirectional data path; UB/LB pins enable byte-select writes |
| SEML / SEMR | Semaphore Enable (Left/Right) | Activates semaphore latch access mode; overrides CE for semaphore operations |
| INTL / INTR | Interrupt Flag (Left/Right) | Open-drain output signaling mailbox write event; requires external pull-up |
| BUSYL / BUSYR | Busy Flag (Left/Right) | Indicates port arbitration status; output in master mode, input in slave mode |
| M/S | Master/Slave Select | Configures BUSY pin function: HIGH = master (BUSY output), LOW = slave (BUSY input) |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous, independent read/write access to same memory location without external arbitration logic |
| On-Chip Semaphore Logic | Eight dedicated latches with atomic set/clear semantics for deterministic resource sharing between ports |
| Hardware Arbitration with BUSY | Guarantees deterministic resolution of port contention within tPS window; eliminates software polling overhead |
| Expandable Data Bus Width | M/S pin enables direct master/slave cascading for 32-bit or wider memory without discrete glue logic |
| Mailbox-Based Inter-Port Messaging | Two highest memory addresses (1FFEh/1FFFh) serve as interrupt-triggered message registers for low-latency IPC |
Applications
| Interprocessor Communication Buffer | Dual-Port Video Frame Store |
|---|---|
|
Use Scenario: Two microcontrollers exchange sensor data and control commands in real time using shared memory. IC Role / Device Role / Timing Role: Dual-port SRAM acts as a zero-latency, lock-free data exchange buffer with hardware semaphore coordination. Use Value: Eliminates need for external arbitration logic or software mutexes; reduces inter-processor latency to single memory-cycle duration. |
Use Scenario: Graphics controller reads rendered frame while display engine simultaneously writes next frame. IC Role / Device Role / Timing Role: Provides concurrent read/write access to frame buffer memory with BUSY-flag synchronization. Use Value: Enables flicker-free double-buffering at full pixel clock rates without CPU intervention or frame tearing. |
| Industrial PLC Memory Coherency | Communications Protocol Stack Buffer |
|
Use Scenario: PLC main processor and I/O scan engine share configuration and status tables with deterministic update guarantees. IC Role / Device Role / Timing Role: Acts as coherent shared memory with semaphore-controlled critical section protection. Use Value: Ensures atomic updates to shared variables across execution domains; prevents race conditions in safety-critical loops. |
Use Scenario: Modem baseband processor and host MCU exchange packetized protocol data over shared memory. IC Role / Device Role / Timing Role: Serves as interrupt-driven mailbox buffer with INT flag signaling packet arrival/completion. Use Value: Reduces host interrupt load and packet processing jitter; supports burst transfers without DMA channel contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT70V25L25PF | 8K × 16-bit, 25 ns access, 3.3 V supply; no M/S pin or integrated semaphores | Requires external arbitration logic and voltage translation for 5 V systems | Choose when lower power and faster access outweigh loss of on-chip semaphore and master/slave flexibility |
| IS61LV51216AL-10TLI | 32K × 16-bit, 10 ns access, 3.3 V; asynchronous dual-port but no BUSY/INT/SEM signals | Lacks hardware arbitration and inter-port signaling; relies on software protocols | Prefer for high-speed, large-capacity buffers where external control logic is already present |
Compared with IDT70V25L25PF and IS61LV51216AL-10TLI, the CY7C025-55AXC uniquely integrates arbitration, semaphores, and master/slave expansion in a 5 V, 55 ns package-enabling simpler, more deterministic dual-processor designs without external logic or voltage translation.
Availability
CY7C025-55AXC is available at Aetrix Electronics and suitable for interprocessor communication buffers, dual-port video frame stores, industrial PLC memory coherency, and communications protocol stack buffers requiring stable component supply across extended lifecycle programs.
Supply support for CY7C025-55AXC 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 memory, microcontrollers, and programmable solutions for embedded systems.
The CY7C025 belongs to Cypress's legacy dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time industrial and communications equipment.
FAQ
What is the function of the M/S pin on CY7C025-55AXC?
The M/S (Master/Slave) pin configures the device's BUSY pin behavior: when HIGH, BUSY functions as an output indicating local arbitration result (master mode); when LOW, BUSY becomes an input accepting arbitration signals from a master device (slave mode). This enables direct cascading of multiple CY7C025 devices into wider memory systems without external logic.
How do the semaphore latches operate in CY7C025-55AXC?
The CY7C025-55AXC provides eight dedicated semaphore latches accessed via the SEM pin. Writing '0' to a semaphore grants exclusive ownership to that port; writing '1' releases it. Ownership is atomic and enforced by internal logic-only the owning port can modify its semaphore value. Semaphores are separate from main memory and accessed using A0–A2 as address lines.
Can CY7C025-55AXC be used in a 3.3 V system?
No. The CY7C025-55AXC is specified for 5 V ±10% operation only (4.5 V to 5.5 V). Its input thresholds, output drive strength, and internal logic are designed for TTL-compatible 5 V signaling. Using it with 3.3 V supplies risks unreliable operation, excessive ICC, or permanent damage due to VIH/VIL mismatch and insufficient noise margin.
What memory addresses are used for interrupt mailbox functionality?
The CY7C025-55AXC reserves the two highest addresses in its 8K space for mailbox interrupts: 1FFFh (right port mailbox) and 1FFEh (left port mailbox). Writing to the opposite port's mailbox address asserts its INT flag; reading that address clears the flag. BUSY must be inactive for interrupt generation and clearing to occur reliably.
CY7C025-55AXC 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:
- 128Kbit
- Memory Organization:
- 8K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 55ns
- Access Time:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-TQFP (14x14)
CY7C025-55AXC FAQ
1.How can I place an order for CY7C025-55AXC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C025-55AXC 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 CY7C025-55AXC reliable?
The price and inventory of CY7C025-55AXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C025-55AXC is usually 5 days.
3.What payment methods are accepted for CY7C025-55AXC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C025-55AXC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C025-55AXC?
CY7C025-55AXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C025-55AXC 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 CY7C025-55AXC?
For technical support, including CY7C025-55AXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C025-55AXC requirements.
6.How does Aetrix verify that CY7C025-55AXC is sourced from the original manufacturer or authorized distributors?
All CY7C025-55AXC 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 CY7C025-55AXC meets industry standards.
7.What is the process for return or replacement of CY7C025-55AXC?
All CY7C025-55AXC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C025-55AXC, 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 CY7C025-55AXC part is unused and in its original packaging.
Return procedure for CY7C025-55AXC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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