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Infineon Technologies CY7C135-25JXI
- Part No.:
- CY7C135-25JXI
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
CY7C135-25JXI.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,789
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Product details
Overview
CY7C135-25JXI from Cypress Semiconductor is a 4K × 8 true dual-port static RAM with fully asynchronous operation, 25 ns maximum access time, 5 V ±10% supply, and 52-pin PLCC package. It enables simultaneous independent read access to the same memory location on left and right ports, supporting interprocessor communication and video buffering in real-time embedded systems.
For engineers reviewing the CY7C135-25JXI datasheet, CY7C135-25JXI pinout, CY7C135-25JXI application, or CY7C135-25JXI equivalent, key selection criteria include dual-port arbitration requirements (semaphore-free vs. CY7C1342), standby current optimization (ISB1 = 40 mA), and industrial temperature support (–40°C to +85°C).
Technical Context
The CY7C135-25JXI implements two fully independent address/data/control interfaces - left port (A0L–A11L, R/WL, CEL, OEL) and right port (A0R–A11R, R/WR, CER, OER) - with no internal arbitration logic. Each port operates asynchronously, allowing concurrent reads or writes without wait states or collision detection.
It uses 0.65 µm CMOS process for balanced speed and power, supports automatic power-down per port via CE assertion, and delivers VOH ≥ 2.4 V / VOL ≤ 0.4 V under TTL-compatible loads. Unlike CY7C1342, it excludes semaphore latches and SEM pins, requiring external handshaking for shared-resource coordination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 8 (32,768 bits), enabling byte-wide data exchange between two independent bus domains |
| Access Time (tAA) | 25 ns max - defines minimum clock-to-data latency for synchronous interface integration |
| VCC Supply Range | 5 V ±10% - compatible with standard TTL/CMOS logic rails; requires stable 4.5–5.5 V regulation |
| Operating Current (ICC) | 180 mA max (industrial) - determines thermal budget and regulator sizing for continuous dual-port activity |
| Standby Current (ISB1) | 40 mA max (industrial, both ports disabled) - critical for low-power sleep-mode system design |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and communications equipment |
| Input Voltage Thresholds | VIH ≥ 2.2 V, VIL ≤ 0.8 V - ensures reliable interfacing with 5 V TTL and CMOS drivers |
Pinout & Package
Package: 52-pin Plastic Leaded Chip Carrier (PLCC), surface-mount, JEDEC MS-026AC compliant, lead-free option available.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A11L | Left-port address inputs | 12-bit address bus for left-side memory access; must be stable before CE/OE assertion |
| A0R–A11R | Right-port address inputs | 12-bit address bus for right-side memory access; fully independent of left-port timing |
| CEL, CER | Chip enable (active-low) | Per-port enable: asserting either disables output drivers and reduces ICC to ISB levels |
| OEL, OER | Output enable (active-low) | Controls three-state output drivers independently; allows bus sharing without contention |
| R/WL, R/WR | Read/write control (active-low write) | Determines direction: HIGH = read, LOW = write; must be HIGH during address transitions |
| I/O0L–I/O7L | Left-port bidirectional data I/O | 8-bit data path; high-impedance when OEL HIGH or CEL HIGH; driven only during valid read/write |
| I/O0R–I/O7R | Right-port bidirectional data I/O | 8-bit data path; electrically isolated from left port; no internal arbitration or conflict detection |
| VCC (Pin 48), GND (Pin 24) | Power supply terminals | Single 5 V supply; decoupling required within 1 cm of VCC/GND pair to maintain signal integrity |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port architecture | Enables simultaneous read access to identical addresses on both ports - essential for lock-free status mirroring |
| Fully asynchronous operation | No clock required; eliminates timing synchronization overhead between heterogeneous processors or buses |
| Per-port power-down control | Independent CE-driven sleep mode per port reduces dynamic power by >90% when idle - critical for burst-mode systems |
| 0.65 µm CMOS process | Delivers 25 ns access at 180 mA ICC (industrial), balancing performance and thermal dissipation in dense PCB layouts |
| TTL/CMOS-compatible I/O | VOH ≥ 2.4 V / VOL ≤ 0.4 V ensures interoperability with legacy 5 V microcontrollers and FPGAs without level shifters |
Applications
| Interprocessor Communication | Video Frame Buffering |
|---|---|
|
Use Scenario: Two microcontrollers exchange real-time sensor data and control commands via shared memory without interrupt latency. IC Role / Device Role / Timing Role: Dual-port SRAM acts as non-blocking data conduit; left port connects to MCU-A, right port to MCU-B. Use Value: Eliminates software polling or hardware semaphores - 25 ns access enables sub-microsecond inter-core message transfer. |
Use Scenario: A graphics controller writes pixel data while a display engine reads concurrently for live video output. IC Role / Device Role / Timing Role: Serves as ping-pong frame buffer; left port handles write-back from rendering pipeline, right port feeds display scan-out. Use Value: Enables flicker-free 60 Hz video at 8-bit color depth using single-cycle read/write overlap - no external arbitration logic needed. |
| Communications Protocol Stack | Industrial PLC Data Exchange |
|
Use Scenario: UART/FIFO buffers and protocol state variables are shared between host processor and modem subsystem in a cellular baseband unit. IC Role / Device Role / Timing Role: Provides deterministic, wait-state-free memory for layered protocol handling (e.g., TCP/IP offload + modem AT command parsing). Use Value: 4K × 8 capacity accommodates multiple concurrent socket buffers; 25 ns access prevents packet loss under burst traffic. |
Use Scenario: Programmable logic controller synchronizes I/O scan cycles between CPU and motion control co-processor using shared status registers. IC Role / Device Role / Timing Role: Acts as deterministic shared register bank; left port tied to main CPU, right port to servo ASIC. Use Value: Industrial temperature rating (–40°C to +85°C) and 40 mA ISB1 ensure reliability in factory-floor enclosures with minimal cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1342-25JXI | Includes eight hardware semaphores and SEM/SEML/SEMR pins; otherwise identical timing, pinout, and memory map | Required where software-controlled resource arbitration (e.g., shared FIFOs or configuration registers) is mandatory | Select when on-chip semaphore logic is needed to avoid external arbitration circuitry or firmware complexity |
| IDT7132SA25YG | Same 4K × 8 organization and 25 ns access, but uses 28-pin SOIC; lacks per-port OE and has different CE behavior | Suitable for space-constrained designs where PLCC footprint is unacceptable and simplified control is acceptable | Choose only if board layout prohibits 52-pin PLCC and system can tolerate reduced control flexibility (no independent OE) |
Compared with CY7C1342-25JXI, this part removes semaphore logic to reduce cost and simplify timing analysis; compared with IDT7132SA25YG, it offers full per-port control granularity and industrial temperature support in a standardized PLCC package.
Availability
CY7C135-25JXI is available at Aetrix Electronics and suitable for interprocessor communication, video frame buffering, communications protocol stacks, and industrial PLC data exchange requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY7C135-25JXI 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/USB-C solutions for industrial, automotive, and consumer markets.
CY7C135 belongs to Cypress's legacy dual-port SRAM product line, designed specifically for deterministic, low-latency memory sharing between heterogeneous processors and real-time subsystems without arbitration overhead.
FAQ
Is CY7C135-25JXI pin-compatible with CY7C1342-25JXI?
Yes - both devices share identical 52-pin PLCC pinouts and electrical timing specifications. The only physical difference is that CY7C1342 exposes SEM, SEML, and SEMR pins (Pins 3, 4, and 5), which are No Connect (NC) on CY7C135-25JXI. All other signals - address, data, CE, OE, R/W - map identically.
Does CY7C135-25JXI support simultaneous read-write operations on different addresses?
Yes - the device permits fully independent read and write operations on distinct memory locations across left and right ports. However, simultaneous access to the *same* address is allowed only for reads; concurrent write-write or read-write to one location is undefined and must be avoided via external coordination.
What is the significance of ISB1 = 40 mA (industrial) in system design?
This value represents maximum current draw when both ports are disabled (CEL and CER ≥ VIH) under industrial conditions (–40°C to +85°C). It directly impacts standby power budgeting - for example, in battery-backed systems, it determines minimum battery life during idle periods without requiring full power cycling.
Can CY7C135-25JXI operate reliably at 4.5 V supply?
Yes - its VCC specification is 5 V ±10%, meaning 4.5 V to 5.5 V is fully supported. At 4.5 V, access time remains within 25 ns (per datasheet Table on Page 5), and VOH/VOL remain compliant (VOH ≥ 2.4 V, VOL ≤ 0.4 V) under specified load conditions, ensuring robust TTL-level interoperability.
CY7C135-25JXI 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:
- 32Kbit
- Memory Organization:
- 4K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 25ns
- Access Time:
- 25 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
CY7C135-25JXI FAQ
1.How can I place an order for CY7C135-25JXI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C135-25JXI 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 CY7C135-25JXI reliable?
The price and inventory of CY7C135-25JXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C135-25JXI is usually 5 days.
3.What payment methods are accepted for CY7C135-25JXI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C135-25JXI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C135-25JXI?
CY7C135-25JXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C135-25JXI 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 CY7C135-25JXI?
For technical support, including CY7C135-25JXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C135-25JXI requirements.
6.How does Aetrix verify that CY7C135-25JXI is sourced from the original manufacturer or authorized distributors?
All CY7C135-25JXI 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 CY7C135-25JXI meets industry standards.
7.What is the process for return or replacement of CY7C135-25JXI?
All CY7C135-25JXI units undergo pre-shipment inspection (PSI). If there is an issue with CY7C135-25JXI, 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 CY7C135-25JXI part is unused and in its original packaging.
Return procedure for CY7C135-25JXI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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