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Infineon Technologies CY7C138-15JXC
- Part No.:
- CY7C138-15JXC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
CY7C138-15JXC.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,712
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Product details
Overview
CY7C138-15JXC from Cypress Semiconductor is a 4K × 8 true dual-port static RAM with independent left/right ports, 15 ns access time, TTL-compatible I/O, and on-chip semaphore/interrupt/busy arbitration logic. It enables simultaneous asynchronous read/write access to shared memory in multiprocessor interconnects and video buffer applications.
For engineers reviewing the CY7C138-15JXC datasheet, CY7C138-15JXC pinout, CY7C138-15JXC application, or CY7C138-15JXC equivalent, key selection criteria include dual-port arbitration behavior, 68-pin PLCC package compatibility, 5 V ±10% supply operation, and port-to-port timing delays (tWDD = 30 ns, tDDD = 25 ns) critical for real-time handshaking.
Technical Context
The CY7C138-15JXC implements fully asynchronous dual-port architecture with separate address, data, and control buses per port (A0L–A11L/I/O0L–I/O7L/CEL/OEL/R/WL and A0R–A11R/I/O0R–I/O7R/CER/OER/R/WR). Arbitration is handled via hardware BUSY flags, INT signaling (push-pull, no pull-up required), and eight shared semaphores accessed via SEML/SEMR and A0–A2.
It supports master/slave expansion (M/S pin) for 16-bit+ memory width without external logic, and automatic power-down per port via CE or SEM assertion. The device operates at 0°C to +70°C (Commercial grade) with VCC = 5 V ±10%, and uses 0.65-µm CMOS process for optimized speed/power trade-off (ICC = 160 mA max, ISB1 = 30 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 8 bits (32,768 total bits), enabling byte-wide dual-access storage |
| Access Time | 15 ns maximum - defines minimum cycle time for deterministic real-time interprocessor reads/writes |
| Supply Voltage | 5 V ±10% - compatible with legacy TTL and 5 V microcontroller bus interfaces |
| Operating Current | 160 mA max (ICC) - sets thermal and PSU sizing requirements for sustained dual-port activity |
| Standby Current | 30 mA (ISB1, both ports disabled) - enables low-power idle states in battery-backed or energy-sensitive systems |
| Input/Output Voltage Levels | VIH = 2.2 V, VIL = 0.8 V, VOH = 2.4 V, VOL = 0.4 V - ensures noise margin >0.4 V under TTL loading |
| Port-to-Port Delay | tWDD = 30 ns, tDDD = 25 ns - constrains maximum achievable handshake rate between processors sharing memory |
Pinout & Package
Package: 68-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 (0x000–0xFFF) |
| A0R–A11R | Right port address inputs | 12-bit address bus for right-side memory access (0x000–0xFFF) |
| I/O0L–I/O7L | Left port bidirectional data bus | 8-bit parallel data path; high-impedance when OEL HIGH or CEL HIGH |
| I/O0R–I/O7R | Right port bidirectional data bus | 8-bit parallel data path; high-impedance when OER HIGH or CER HIGH |
| CEL / CER | Chip enable (active LOW) | Enables memory array access per port; controls automatic power-down entry/exit |
| OEL / OER | Output enable (active LOW) | Controls output drivers only; does not affect internal memory state or power mode |
| R/WL / R/WR | Read/write control (active LOW = write) | Determines data direction on I/O bus; must be HIGH during address transitions |
| SEML / SEMR | Semaphore enable (active LOW) | Switches port to semaphore register access mode; A0–A2 select one of eight latches |
| INTL / INTR | Interrupt flag (push-pull output) | Indicates cross-port mailbox event (e.g., INTR set by left-port write to 0xFFF) |
| BUSYL / BUSYR | Busy flag (output in master, input in slave) | Signals contention on concurrent same-address access; blocks write until cleared |
| M/S | Master/slave select | Configures device as master (LOW) or slave (HIGH) for 16-bit+ memory expansion |
| VCC / GND | Power supply pins | Single 5 V supply; decoupling required per PLCC layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port memory cells | Enables simultaneous independent read/write to identical addresses without corruption or arbitration delay |
| On-chip semaphore logic (8 latches) | Eliminates need for external locking logic; software-controlled resource sharing via A0–A2 addressing |
| Hardware BUSY flag with 15 ns response | Provides immediate contention detection for deterministic real-time system recovery |
| Push-pull INT outputs (no pull-up required) | Reduces BOM count and PCB routing complexity for inter-processor interrupt signaling |
| Master/slave expansion (M/S pin) | Supports seamless 16-bit+ data width using multiple CY7C138 devices without discrete glue logic |
Applications
| Interprocessor Communication Buffer | Dual-Port Video Frame Buffer |
|---|---|
|
Use Scenario: Two microcontrollers exchange status, commands, and telemetry via shared memory in an industrial PLC backplane. IC Role / Device Role / Timing Role: Dual-port SRAM acts as non-blocking message queue with semaphore-controlled access and BUSY-driven retry logic. Use Value: Eliminates software polling overhead and guarantees atomic resource access with hardware-enforced mutual exclusion. |
Use Scenario: Graphics controller writes frame data while display controller reads previous frame, synchronized via INT flags. IC Role / Device Role / Timing Role: Memory serves as ping-pong buffer; INTR signals frame completion, tDDD = 25 ns ensures minimal display latency. Use Value: Enables flicker-free 60 Hz video output without CPU intervention or external FIFO logic. |
| Communications Protocol Stack Buffer | Real-Time Data Acquisition Buffer |
|
Use Scenario: UART/DMA subsystem stores incoming packet payloads while host processor parses headers and dispatches packets. IC Role / Device Role / Timing Role: Left port handles DMA writes; right port enables CPU reads; BUSY prevents overwrites during parsing. Use Value: Sustains 115.2 kbps serial throughput with zero packet loss under full CPU load. |
Use Scenario: High-speed ADC streams samples into memory while DSP processes prior block; semaphore coordinates buffer ownership. IC Role / Device Role / Timing Role: Dual-port SRAM decouples sampling (left port) from processing (right port); tAA = 15 ns supports ≥66 MHz sample rates. Use Value: Achieves continuous 12-bit, 1 MSPS acquisition without DMA bottlenecks or FIFO overflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT7134SA15YG | 4K × 8, 15 ns, 5 V, 68-pin PLCC - identical timing and pinout but lacks M/S pin and integrated semaphores | Requires external arbitration logic for semaphore functionality; suitable only where software-only handshaking suffices | Select when cost sensitivity outweighs need for hardware semaphore integration |
| ISSI IS61LV25616AL-15TQLI | 256K × 16, 15 ns, 3.3 V, 100-pin TQFP - higher density, lower voltage, different package and bus width | Not pin-compatible; requires level-shifting and PCB redesign; supports wider data paths but no native dual-port arbitration | Select only for new designs targeting 3.3 V systems and requiring >4K depth; not a drop-in replacement |
Compared with IDT7134SA15YG and IS61LV25616AL-15TQLI, the CY7C138-15JXC uniquely integrates semaphores, BUSY/INT flags, and M/S expansion in a 5 V, 68-pin PLCC package - making it the sole choice for legacy interprocessor designs requiring hardware-managed resource sharing without added logic.
Availability
CY7C138-15JXC is available at Aetrix Electronics and suitable for interprocessor communication buffers, dual-port video frame buffers, communications protocol stack buffers, and real-time data acquisition buffers requiring stable component supply across extended production lifecycles.
Supply support for CY7C138-15JXC 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 memory, microcontrollers, and programmable solutions for embedded systems.
The CY7C138 belongs to Cypress's legacy dual-port SRAM product line, designed specifically for deterministic, low-latency interprocessor communication in industrial control, telecom infrastructure, and graphics subsystems.
FAQ
What is the function of the M/S pin on CY7C138-15JXC?
The M/S (Master/Slave) pin configures the device for 16-bit or wider memory expansion: when LOW, it operates as a master device enabling direct connection to slave devices without external logic; when HIGH, it functions as a slave. This eliminates the need for discrete address decoding or bus transceivers in multi-chip memory systems.
How do the BUSY flags behave during simultaneous access to the same address?
When both ports attempt to access the same memory location, BUSYL and BUSYR assert LOW within 15 ns (tBLA) to signal contention. The writing port is blocked until BUSY deasserts; reads proceed but return indeterminate data if a write is pending. BUSY remains active until the conflicting access completes and the port releases the address.
Can the semaphore latches be used independently by each port?
Yes - the eight semaphores are shared resources accessible by either port via SEML/SEMR and A0–A2. Only one port may write to a given semaphore at a time; the other port sees the latch value but cannot modify it until ownership is released. This enforces strict mutual exclusion for shared peripherals or memory regions.
Is CY7C138-15JXC compatible with 3.3 V logic interfaces?
No - CY7C138-15JXC is strictly a 5 V ±10% device with TTL-compatible input thresholds (VIH = 2.2 V, VIL = 0.8 V) and output drive levels (VOH = 2.4 V min). Direct connection to 3.3 V systems requires level-shifting circuitry; it is not 3.3 V tolerant and may suffer reliability degradation if VCC deviates from 5 V specification.
CY7C138-15JXC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 68-LCC (J-Lead)
- Packaging:
- Tray
- 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:
- 15ns
- Access Time:
- 15 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 68-PLCC (24.23x24.23)
CY7C138-15JXC FAQ
1.How can I place an order for CY7C138-15JXC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C138-15JXC 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 CY7C138-15JXC reliable?
The price and inventory of CY7C138-15JXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C138-15JXC is usually 5 days.
3.What payment methods are accepted for CY7C138-15JXC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C138-15JXC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C138-15JXC?
CY7C138-15JXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C138-15JXC 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 CY7C138-15JXC?
For technical support, including CY7C138-15JXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C138-15JXC requirements.
6.How does Aetrix verify that CY7C138-15JXC is sourced from the original manufacturer or authorized distributors?
All CY7C138-15JXC 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 CY7C138-15JXC meets industry standards.
7.What is the process for return or replacement of CY7C138-15JXC?
All CY7C138-15JXC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C138-15JXC, 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 CY7C138-15JXC part is unused and in its original packaging.
Return procedure for CY7C138-15JXC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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