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Infineon Technologies CY7C024-55JXC
- Part No.:
- CY7C024-55JXC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 84-LCC (J-Lead)
- Datasheet:
-
CY7C024-55JXC.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 84PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,065
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Product details
Overview
CY7C024-55JXC from Cypress Semiconductor is a 4K × 16-bit true dual-port static RAM with independent left/right ports, on-chip arbitration logic, semaphores, and INT/BUSY flags. It supports simultaneous asynchronous reads of the same memory location, delivers 55 ns access time, consumes 150 mA typical operating current at 5 V, and operates across commercial temperature range (0°C to +70°C). It is used in interprocessor communication buffers and dual-port video memory subsystems.
For engineers reviewing the CY7C024-55JXC datasheet, CY7C024-55JXC pinout, CY7C024-55JXC application, or CY7C024-55JXC equivalent, key selection considerations include its 84-pin PLCC package, master/slave expandability via M/S pin, semaphore-controlled resource sharing, and BUSY/INT flag behavior during port contention.
Technical Context
The CY7C024-55JXC implements fully asynchronous dual-port operation with separate CE/R/W/OE controls per port and dedicated address/data buses. Its on-chip arbitration resolves simultaneous access to identical memory locations using deterministic BUSY assertion timing (tBLA/tBLC) and priority resolution within tPS.
Semaphore logic comprises eight shared latches accessible via SEM pin activation, where A0–A2 select latch index and I/O0 determines token state (0 = acquired, 1 = released); interrupt signaling uses upper two memory addresses (FFE/FFF) as mailboxes with auto-reset-on-read behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 16-bit (64 Kbit total), enabling direct interface to 16-bit data buses without external width expansion |
| Access Time | 55 ns maximum - defines minimum clock-to-data delay for synchronous system integration |
| Operating Voltage | 5 V ±10% - requires stable 4.5–5.5 V supply; not compatible with 3.3 V logic domains |
| Operating Current | 150 mA typical - sets power budget for multi-device dual-port memory banks |
| Temperature Range | 0°C to +70°C (Commercial) - validated for non-industrial ambient environments |
| Arbitration Flags | BUSY and INT per port - BUSY indicates real-time contention status; INT enables mailbox-style inter-port messaging |
| Semaphore Count | 8 independent latches - provides hardware-enforced mutual exclusion for up to eight shared resources |
Pinout & Package
Package: 84-pin Plastic Leaded Chip Carrier (PLCC), lead-free compliant, surface-mountable with J-lead geometry and 0.05-inch pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left/Right) | Independent port activation; low enables memory access and disables automatic power-down |
| R/WL / R/WR | Read/Write Control (Left/Right) | Active-low write enable; high enables read operation when OE is asserted |
| OEL / OER | Output Enable (Left/Right) | Controls tri-state output drivers; required for valid data readout |
| SEML / SEMR | Semaphore Enable (Left/Right) | Activates semaphore latch access instead of memory array; CE must remain high |
| INTL / INTR | Interrupt Flag (Left/Right) | Open-drain output asserting on mailbox write; resets only upon owner's mailbox read |
| BUSYL / BUSYR | Busy Flag (Left/Right) | In master mode: output indicating port arbitration outcome; in slave mode: input accepting master's BUSY signal |
| M/S | Master/Slave Select | High = master (BUSY pins output); low = slave (BUSY pins input) - enables 32-bit+ bus expansion without external logic |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enables byte-level write masking: UB+LB = full 16-bit write; UB only = upper byte; LB only = lower byte |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Memory Cells | Enables concurrent read operations from both ports to identical addresses without data corruption or added latency |
| On-Chip Arbitration Logic | Resolves port contention deterministically within tPS window, eliminating need for external arbitration circuitry |
| Dedicated Semaphore Latches (8) | Provides hardware-managed mutual exclusion for shared peripherals or memory regions without software polling overhead |
| Configurable Master/Slave Mode | Allows seamless 32-bit data bus expansion using M/S pin - no glue logic or discrete buffers required |
| Mailbox-Based Interrupt System | Uses FFE/FFF addresses as port-specific mailboxes with auto-clear-on-read semantics for reliable inter-processor signaling |
Applications
| Interprocessor Communication Buffer | Dual-Port Video Frame Buffer |
|---|---|
Use Scenario: Two microcontrollers exchange control commands and status updates via shared memory without bus contention. IC Role / Device Role / Timing Role: Dual-port SRAM acts as synchronized message-passing buffer with semaphore-controlled access and INT-driven event notification. Use Value: Eliminates software handshake delays; BUSY/INT flags provide deterministic timing for real-time response under contention. | Use Scenario: Graphics controller writes frame data while display engine reads previous frame simultaneously. IC Role / Device Role / Timing Role: Provides independent read/write ports with byte-select capability to support partial-frame updates and overlay rendering. Use Value: Enables flicker-free display refresh by decoupling write and read timing paths; 55 ns access supports VGA/SVGA pixel rates. |
| Communications Protocol Stack Buffer | Industrial PLC Data Exchange Module |
Use Scenario: UART or Ethernet MAC layer stores incoming packets while application layer processes prior frames. IC Role / Device Role / Timing Role: Acts as zero-wait-state packet buffer with mailbox-interrupt signaling between protocol layers. Use Value: Prevents packet loss during burst traffic; semaphore latches coordinate buffer descriptor management across firmware threads. | Use Scenario: PLC CPU and I/O processor share sensor readings and actuator commands in real-time control loops. IC Role / Device Role / Timing Role: Serves as deterministic shared memory with hardware arbitration ensuring consistent I/O state visibility. Use Value: Guarantees atomic access to critical variables (e.g., PID setpoints) via semaphores, avoiding race conditions in safety-critical cycles. |
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 | 3.3 V supply, 25 ns access, 4K × 16 organization, 100-pin TQFP | Requires level-shifting for 5 V systems; faster but incompatible voltage domain | Select when migrating to low-voltage designs with tighter timing budgets |
| CY7C028-55JC | 8K × 16 organization, same 55 ns speed and 84-pin PLCC package | Double memory depth; pin-compatible but larger address space requires A12 routing | Select when application requires >4K words without board redesign |
Compared with IDT70V25L25PF and CY7C028-55JC, the CY7C024-55JXC uniquely balances 5 V compatibility, 84-pin PLCC footprint, and proven arbitration/semaphore implementation for legacy industrial and communications designs.
Availability
CY7C024-55JXC is available at Aetrix Electronics and suitable for interprocessor communication buffers, dual-port video frame buffers, and communications protocol stack buffers requiring stable component supply across extended production lifecycles.
Supply support for CY7C024-55JXC 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 fabless semiconductor company specializing in programmable system-on-chip, memory, and USB solutions for embedded and industrial markets.
The CY7C024 series belongs to Cypress's legacy dual-port SRAM product line, designed specifically for deterministic inter-processor data exchange in real-time control and graphics subsystems.
FAQ
What is the function of the M/S pin on CY7C024-55JXC?
The M/S pin configures the device as master (M/S = HIGH) or slave (M/S = LOW). In master mode, BUSY pins output arbitration results; in slave mode, they accept BUSY input from a master. This enables 32-bit+ data bus expansion without external logic or discrete components, using only daisy-chained BUSY signals.
How do the semaphore latches operate in CY7C024-55JXC?
The eight semaphore latches are accessed via SEM pin activation (with CE held HIGH). Writing 0 to a latch grants ownership to that port; writing 1 releases it. Ownership is exclusive: only the side reading 0 may modify the latch. Reading returns the current token state, latched to prevent corruption during cross-port writes.
Can CY7C024-55JXC perform simultaneous read and write to the same address?
No - simultaneous read and write to the same address causes contention. The BUSY flag asserts on the contending port, blocking access until arbitration completes. Valid data read during contention is non-deterministic unless delayed by tDDD after the write-side data appears, per datasheet timing requirements.
What are the valid interrupt mailbox addresses for CY7C024-55JXC?
The left port's mailbox is at address FFEh; the right port's is at FFh. Writing to the opposite port's mailbox asserts its INT flag. Reading the mailbox clears the flag. BUSY assertion prevents mailbox reads and thus blocks interrupt clearing until contention resolves.
CY7C024-55JXC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 84-LCC (J-Lead)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 64Kbit
- Memory Organization:
- 4K 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:
- 84-PLCC (29.31x29.31)
CY7C024-55JXC FAQ
1.How can I place an order for CY7C024-55JXC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C024-55JXC 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 CY7C024-55JXC reliable?
The price and inventory of CY7C024-55JXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C024-55JXC is usually 5 days.
3.What payment methods are accepted for CY7C024-55JXC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C024-55JXC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C024-55JXC?
CY7C024-55JXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C024-55JXC 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 CY7C024-55JXC?
For technical support, including CY7C024-55JXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C024-55JXC requirements.
6.How does Aetrix verify that CY7C024-55JXC is sourced from the original manufacturer or authorized distributors?
All CY7C024-55JXC 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 CY7C024-55JXC meets industry standards.
7.What is the process for return or replacement of CY7C024-55JXC?
All CY7C024-55JXC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C024-55JXC, 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 CY7C024-55JXC part is unused and in its original packaging.
Return procedure for CY7C024-55JXC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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