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Infineon Technologies CY7C131-55JXC
- Part No.:
- CY7C131-55JXC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
CY7C131-55JXC.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,562
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Product details
Overview
CY7C131-55JXC from Cypress Semiconductor is a 1 K × 8 true dual-port static RAM with independent left/right ports, 55 ns maximum access time, 5 V ±10% supply, and 52-pin PLCC package. It supports simultaneous reads of the same memory location and features BUSY arbitration and INT port-to-port interrupt flags. Used in multi-processor cache buffers and DSP shared-memory subsystems.
For engineers reviewing the CY7C131-55JXC datasheet, CY7C131-55JXC pinout, CY7C131-55JXC application, or CY7C131-55JXC equivalent, key selection criteria include dual-port arbitration timing (tBLA ≤20 ns), standby current (ISB1 = 35 mA), open-drain BUSY output requiring pull-up, and compatibility with CY7C141 for 16-bit expansion.
Technical Context
This device implements fully asynchronous dual-port SRAM architecture with independent CE/R/W/OE controls per port and hardware-based arbitration logic detecting address collisions. The BUSY flag asserts when both ports attempt concurrent access to the same address, while INT signals data placement at dedicated locations (3FFH left, 3FEH right).
It supports automatic power-down per port via CE assertion and operates across industrial temperature range (–40°C to +85°C). The 52-pin PLCC package accommodates full 10-bit addressing (A0L–A9L / A0R–A9R), 8-bit bidirectional I/O per port, and dedicated control/flag pins including open-drain BUSY outputs requiring external pull-up resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 1 K × 8 bits (1024 words × 8 data lines) per port |
| Access Time | 55 ns max - defines minimum read cycle time (tRC) for synchronous system integration |
| Supply Voltage | 5 V ±10% - requires stable 4.5–5.5 V rail; not compatible with 3.3 V systems |
| Operating Current | 110 mA max ICC - determines thermal budget and regulator sizing in active mode |
| Standby Current | 35 mA max ISB1 - sets low-power idle consumption when both ports disabled |
| I/O Voltage Levels | VIH ≥2.2 V, VIL ≤0.8 V - TTL-compatible input thresholds; VOH ≥2.4 V at –4 mA |
| Capacitance | CIN = 15 pF, COUT = 10 pF - constrains trace length and fanout in high-speed layout |
Pinout & Package
Package: 52-pin Plastic Leaded Chip Carrier (PLCC), JEDEC standard, lead-free compliant, body size 19.13 mm × 19.13 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left/Right) | Active-low per-port enable; controls power-down and output Z-state independently |
| R/WL / R/WR | Read/Write Control (Left/Right) | Active-low write strobe; high = read, low = write; drives internal write logic |
| OEL / OER | Output Enable (Left/Right) | Active-low tri-state control for I/O bus; decouples port from data lines |
| BUSYL / BUSYR | Busy Flag Output (Left/Right) | Open-drain output signaling address conflict; requires external 4.7 kΩ pull-up |
| INTL / INTR | Interrupt Flag (Left/Right) | Open-drain interrupt indicating data written to 3FFH (left) or 3FEH (right) |
| A0L–A9L / A0R–A9R | Address Inputs (Left/Right) | 10-bit address bus per port; selects one of 1024 memory locations |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (Left/Right) | Bidirectional 8-bit data path; direction controlled by R/W and OE states |
| VCC / GND | Power / Ground | Single 5 V supply; 48-pin DIP variant uses pin 48/VCC and pin 24/GND |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Independent address/data/control per port enables concurrent access without software arbitration overhead |
| Hardware Arbitration Logic | Dedicated on-chip logic detects same-address contention and asserts BUSY within 20 ns (tBLA) |
| Port-to-Port Interrupt | INT flag signals inter-port data handoff at fixed addresses (3FFH/3FEH), enabling lock-free synchronization |
| Per-Port Power Management | CE-driven automatic power-down reduces ICC to 35 mA standby with both ports disabled |
| Expandable Data Width | Master configuration supports cascading with CY7C141 to build 16-bit or wider dual-port memory systems |
Applications
| DSP Shared Memory Buffer | Multi-Processor Cache Coherence |
|---|---|
Use Scenario: Two DSP cores share real-time sensor data streams via common memory without CPU intervention. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency shared buffer; left port connects to ADC DMA, right port to DSP core. Use Value: Simultaneous read/write eliminates pipeline stalls; 55 ns access enables >18 MHz sustained throughput per port. | Use Scenario: Two microprocessors coordinate task execution using shared status flags and work queues. IC Role / Device Role / Timing Role: Acts as coherence-enabling memory between processors; BUSY flag prevents race conditions on flag updates. Use Value: Hardware arbitration ensures atomic flag writes; INT signal triggers immediate core wake-up without polling. |
| Bit-Slice Processor Interconnect | Legacy Bus Bridge Interface |
Use Scenario: 4-bit ALU slices require synchronized operand exchange across parallel data paths. IC Role / Device Role / Timing Role: Provides synchronized operand staging area; left port feeds slice N, right port feeds slice N+1. Use Value: 10-bit addressing supports 1K operand pairs; 55 ns latency matches 18 MHz slice clock domain. | Use Scenario: Bridging ISA bus (8-bit) to local controller with separate command/status registers. IC Role / Device Role / Timing Role: Dual-port RAM isolates bus master timing from controller timing; left port handles ISA cycles, right port handles local register access. Use Value: Asynchronous operation absorbs timing skew; CE-controlled power-down cuts idle current during bus gaps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C131-45JXC | 45 ns access time (vs. 55 ns); otherwise identical pinout, timing, and feature set | Suitable where tighter read cycle timing (<45 ns) is required for higher clock domains | Select when system timing margin demands faster access; verify tRC and tAA compliance in target clock tree |
| CY7C141-55JXC | Slave-only dual-port SRAM; no BUSY output (BUSY input only); lacks arbitration logic | Used only in master-slave configurations with CY7C131; cannot operate standalone | Choose only when expanding to 16-bit width; requires CY7C131 as master controller |
Compared with CY7C131-45JXC, this 55 ns variant trades speed for lower power and cost in less timing-critical designs; versus CY7C141-55JXC, it provides full master functionality including arbitration and interrupt generation, enabling standalone use.
Availability
CY7C131-55JXC is available at Aetrix Electronics and suitable for DSP shared-memory buffers, multi-processor cache coherence systems, and bit-slice processor interconnects requiring stable component supply and long-term industrial availability.
Supply support for CY7C131-55JXC 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) designs high-performance memory and programmable solutions for industrial, automotive, and communications systems.
The CY7C13x series targets legacy and long-lifecycle embedded systems requiring reliable, asynchronous dual-port SRAM with hardware arbitration-especially in DSP, multi-core, and bit-slice architectures where deterministic timing is critical.
FAQ
What is the function of the BUSY pin on CY7C131-55JXC?
BUSYL and BUSYR are open-drain outputs that assert low when their respective port attempts to access an address currently being accessed by the opposite port. This hardware arbitration signal prevents data corruption during simultaneous access. External pull-up resistors (typically 4.7 kΩ to VCC) are mandatory for proper logic-level definition.
Can CY7C131-55JXC operate with a 3.3 V supply?
No. CY7C131-55JXC is specified only for 5 V ±10% (4.5–5.5 V) operation. Its VIH/VIL thresholds, output drive strength, and internal logic are designed for TTL-compatible voltage levels. Using 3.3 V will result in undefined behavior, failed arbitration, and potential data retention loss.
How does the INT flag enable inter-port communication?
INTL asserts when data is written to address 3FFH (1023 decimal) on the left port; INTR asserts when data is written to 3FEH (1022 decimal) on the right port. These dedicated locations serve as hardware-synchronized mailboxes, allowing one port to signal completion or request service without polling or shared flag variables.
Is CY7C131-55JXC pin-compatible with CY7C130-55JXI?
No. CY7C131-55JXC uses a 52-pin PLCC package, while CY7C130-55JXI uses a 48-pin DIP. Although both are 1 K × 8 dual-port SRAMs with identical logic functions, their pin counts, layouts, and physical dimensions differ. Direct replacement requires PCB redesign and footprint change.
CY7C131-55JXC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 8Kbit
- Memory Organization:
- 1K x 8
- 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:
- 52-PLCC (19.13x19.13)
CY7C131-55JXC FAQ
1.How can I place an order for CY7C131-55JXC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C131-55JXC 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 CY7C131-55JXC reliable?
The price and inventory of CY7C131-55JXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C131-55JXC is usually 5 days.
3.What payment methods are accepted for CY7C131-55JXC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C131-55JXC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C131-55JXC?
CY7C131-55JXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C131-55JXC 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 CY7C131-55JXC?
For technical support, including CY7C131-55JXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C131-55JXC requirements.
6.How does Aetrix verify that CY7C131-55JXC is sourced from the original manufacturer or authorized distributors?
All CY7C131-55JXC 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 CY7C131-55JXC meets industry standards.
7.What is the process for return or replacement of CY7C131-55JXC?
All CY7C131-55JXC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C131-55JXC, 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 CY7C131-55JXC part is unused and in its original packaging.
Return procedure for CY7C131-55JXC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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