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Infineon Technologies CY7C131-55NXI
- Part No.:
- CY7C131-55NXI
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 52-BQFP
- Datasheet:
-
CY7C131-55NXI.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,586
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Product details
Overview
CY7C131-55NXI 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 industrial temperature range (–40°C to +85°C). It supports simultaneous reads of the same memory location and features BUSY arbitration and INT port-to-port interrupt flags. Used in multi-processor shared-memory systems requiring deterministic low-latency data exchange.
For engineers reviewing the CY7C131-55NXI datasheet, CY7C131-55NXI pinout, CY7C131-55NXI application, or CY7C131-55NXI 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 52-pin PLCC package compatibility with legacy board layouts.
Technical Context
The CY7C131-55NXI implements fully asynchronous dual-port SRAM architecture with separate address/data/control buses per port (A0L–A9L/I/O0L–I/O7L/CEL/R/WL/OEL and A0R–A9R/I/O0R–I/O7R/CER/R/WR/OER). Arbitration logic resolves contention via open-drain BUSYL/BUSYR signals, while dedicated INTL/INTR flags enable inter-port communication at fixed addresses (3FFH and 3FEH).
It supports automatic power-down per port via CE control, delivers 110 mA max operating current (ICC), and uses 0.65 µm CMOS process for optimized speed-power trade-off. The device operates only in 5 V ±10% supply with TTL-compatible inputs and outputs, and requires external pull-up resistors on BUSY and INT pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 1 K × 8 (1024 words × 8 bits); provides byte-wide dual-access storage without external data-width expansion |
| Access Time | 55 ns max; defines worst-case read latency from address valid to data stable under industrial conditions |
| Supply Voltage | 5 V ±10%; mandates regulated 4.5–5.5 V rail; no 3.3 V operation supported |
| Operating Temperature | –40°C to +85°C; qualified for industrial environments with full parameter guarantee |
| Standby Current | 35 mA max (ISB1, both ports disabled); determines quiescent power in idle multi-processor synchronization states |
| Output Drive | IOL = 4.0 mA / VOL ≤ 0.4 V; ensures TTL-level compatibility with legacy logic families |
| Input Thresholds | VIH ≥ 2.2 V, VIL ≤ 0.8 V; compatible with standard 5 V CMOS/TTL input drive requirements |
Pinout & Package
Package: 52-pin Plastic Leaded Chip Carrier (PLCC), lead-free (RoHS-compliant), body size 19.1 mm × 19.1 mm, J-lead profile.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| CEL, CER | Chip Enable (Left/Right) | Active-low per-port enable; controls power-down and memory access activation independently |
| R/WL, R/WR | Read/Write Control (Left/Right) | Active-low write strobe; high = read, low = write; determines data direction per port |
| OEL, OER | Output Enable (Left/Right) | Active-low tri-state control; disables I/O drivers to prevent bus contention |
| A0L–A9L, A0R–A9R | Address Inputs (Left/Right) | 10-bit address buses selecting one of 1024 locations per port; no internal address latching |
| I/O0L–I/O7L, I/O0R–I/O7R | Bidirectional Data Bus (Left/Right) | 8-bit parallel data path per port; high-impedance when OE or CE inactive |
| BUSYL, BUSYR | Busy Flag Output (Open Drain) | Indicates port contention; requires external 4.7 kΩ pull-up to VCC for logic HIGH assertion |
| INTL, INTR | Interrupt Flag (Open Drain) | Signals inter-port event at fixed addresses (3FFH/3FEH); also requires external pull-up |
| VCC, GND | Power Supply | Single 5 V supply; decoupling capacitor (0.1 µF) required per VCC pin per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables concurrent read/write operations on independent ports without internal arbitration delay penalties |
| Hardware Arbitration Logic | Detects address collisions in real time and asserts BUSY within 20 ns (tBLA), enabling deterministic conflict resolution |
| Port-to-Port Interrupt | Fixed-address interrupt generation (3FFH/3FEH) allows zero-software-overhead signaling between processors or DSP cores |
| Per-Port Power Management | Independent CE control enables selective port shutdown, reducing active current by up to 75% during asymmetric workload phases |
| 52-pin PLCC Compatibility | Matches footprint of CY7C131A-55NXI and CY7C141-55NXI, supporting drop-in replacement in existing industrial PCBs |
Applications
| DSP Shared Memory Buffer | Bit-Slice Processor Interconnect |
|---|---|
Use Scenario: Two TMS320C6000 DSPs share real-time sensor data via common memory space with minimal latency overhead. IC Role / Device Role / Timing Role: Dual-port SRAM acts as non-blocking data exchange buffer; BUSY flag prevents corrupted reads during concurrent writes. Use Value: Eliminates software semaphore overhead and guarantees sub-55 ns inter-processor data transfer latency. | Use Scenario: Four 4-bit ALUs operate in parallel with shared instruction/data cache using bit-slice architecture. IC Role / Device Role / Timing Role: Provides synchronized access to microcode ROM and register file; INT flags coordinate pipeline stage handshaking. Use Value: Enables deterministic 55 ns cycle-aligned execution across all slices without clock domain crossing logic. |
| Multi-Processor Synchronization Hub | Legacy Industrial Controller Upgrade |
Use Scenario: ARM Cortex-M7 and PowerPC MPC56xx coexist in safety-critical engine control unit, sharing calibration tables and fault logs. IC Role / Device Role / Timing Role: Acts as arbitration-managed shared memory; BUSY signals enforce atomic access to critical variables. Use Value: Ensures MISRA-compliant deterministic memory access with hardware-enforced mutual exclusion. | Use Scenario: Retrofitting aging PLC backplane with modern microcontrollers while retaining original 5 V TTL bus interface. IC Role / Device Role / Timing Role: Bridges legacy 5 V address/data bus to new controller; matches timing specs of obsolete CY7C130-55PC. Use Value: Extends product lifecycle without redesigning backplane layout or changing bus termination schemes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C131A-55NXI | Functionally identical; same timing, pinout, and electrical specs; marked as enhanced version per datasheet Rev. *H | No functional difference; used interchangeably in new designs where A-suffix preferred for traceability | Select when sourcing new production lots requiring latest revision status and extended manufacturer support |
| CY7C141-55NXI | Slave dual-port device; lacks BUSY output (BUSY input only); no internal arbitration logic; requires master (e.g., CY7C131) to drive it | Only usable in 16-bit+ bus expansion configurations with CY7C131 as master; not standalone | Choose only when expanding data width beyond 8 bits and implementing master-slave topology |
Compared with CY7C131A-55NXI, this part offers identical functionality but may reflect earlier wafer lot qualification; versus CY7C141-55NXI, it provides full autonomous dual-port operation rather than dependent slave behavior-critical for standalone shared-memory use cases.
Availability
CY7C131-55NXI is available at Aetrix Electronics and suitable for industrial motor drives, legacy avionics upgrades, and multi-core embedded controllers requiring stable component supply over extended production lifecycles.
Supply support for CY7C131-55NXI 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 system-on-chip solutions.
The CY7C131 series belongs to Cypress's legacy dual-port SRAM product line, designed specifically for deterministic real-time inter-processor communication in industrial, aerospace, and test equipment applications.
FAQ
Is CY7C131-55NXI pin-compatible with CY7C130-55PC?
No. CY7C131-55NXI uses a 52-pin PLCC package, while CY7C130-55PC uses a 48-pin DIP. Though functionally similar, the pin count, layout, and signal mapping differ-especially for address lines (A0L–A9L vs. A0L–A11L) and BUSY/INT pin assignments. Direct replacement requires PCB redesign.
Does CY7C131-55NXI support 3.3 V operation?
No. The device is specified exclusively for 5 V ±10% operation (4.5 V to 5.5 V). Its input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V), output drive strength, and internal CMOS threshold voltages are calibrated for 5 V logic families. Operation below 4.5 V violates absolute maximum ratings and causes undefined behavior.
What external components are required for BUSY and INT pins?
Both BUSYL/BUSYR and INTL/INTR are open-drain outputs and require external pull-up resistors to VCC. Cypress recommends 4.7 kΩ resistors per signal, placed as close as possible to the SRAM pins. No capacitors or active drivers are needed-these pins interface directly with TTL/CMOS inputs on host processors.
Can CY7C131-55NXI be used without arbitration logic in single-port mode?
Yes. Either port can operate independently by holding the opposing port's CE high (disabled) and ignoring BUSY/INT signals. In this configuration, it functions as a standard asynchronous 1K×8 SRAM with full 55 ns access time-no arbitration overhead applies, and timing parameters match those of single-port devices like CY62128EV30.
CY7C131-55NXI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 52-BQFP
- Packaging:
- Tray
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PQFP (10x10)
CY7C131-55NXI FAQ
1.How can I place an order for CY7C131-55NXI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C131-55NXI 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 CY7C131-55NXI reliable?
The price and inventory of CY7C131-55NXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C131-55NXI is usually 5 days.
3.What payment methods are accepted for CY7C131-55NXI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C131-55NXI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C131-55NXI?
CY7C131-55NXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C131-55NXI 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 CY7C131-55NXI?
For technical support, including CY7C131-55NXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C131-55NXI requirements.
6.How does Aetrix verify that CY7C131-55NXI is sourced from the original manufacturer or authorized distributors?
All CY7C131-55NXI 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 CY7C131-55NXI meets industry standards.
7.What is the process for return or replacement of CY7C131-55NXI?
All CY7C131-55NXI units undergo pre-shipment inspection (PSI). If there is an issue with CY7C131-55NXI, 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 CY7C131-55NXI part is unused and in its original packaging.
Return procedure for CY7C131-55NXI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY7C131-55NXI Tags
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