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Infineon Technologies CY7C028-15AC
- Part No.:
- CY7C028-15AC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
CY7C028-15AC.pdf
- Description:
- IC SRAM 1MBIT PARALLEL 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,631
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Product details
Overview
CY7C028-15AC from Cypress Semiconductor is a 64K × 16-bit true dual-port static RAM with independent left/right ports, 15 ns access time, 5 V supply, and on-chip arbitration logic for interprocessor communication in real-time embedded systems.
For engineers reviewing the CY7C028-15AC datasheet, CY7C028-15AC pinout, CY7C028-15AC application, or CY7C028-15AC equivalent, key selection criteria include simultaneous port access timing, BUSY/INT flag behavior, semaphore latch control, and TQFP-100 package compatibility with master/slave expansion.
Technical Context
This device implements fully asynchronous dual-port architecture with separate address, data, and control buses per port (A0L–A15L/I/O0L–I/O15L/R/WL/CE0L/CE1L/OEL vs A0R–A15R/I/O0R–I/O15R/R/WR/CE0R/CE1R/OER), enabling concurrent read/write to any memory location without external arbitration logic.
On-chip features include eight shared semaphores for resource locking, dedicated BUSY and INT flags per port, Master/Slave mode selection via M/S pin, and automatic power-down controlled independently per port via CE pins - all implemented in 0.35-µm CMOS technology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 64K × 16-bit (1,048,576 bits total; A0–A15 addressing) |
| Access Time | 15 ns maximum - defines minimum read cycle time (tRC) and data valid window for synchronous system integration |
| Supply Voltage | 5.0 V ± 10% - compatible with standard TTL/CMOS logic families and industrial 5 V rails |
| Active Current | 190 mA typical - determines thermal design and power supply sizing under full bus activity |
| Standby Current | 0.05 mA typical (ISB3, both ports CMOS-level CE) - enables low-power hold mode during processor idle |
| Operating Temperature | 0°C to +70°C (Commercial) - validated for office, lab, and non-harsh environment applications |
| Package | 100-pin TQFP (Thin Quad Plastic Flatpack) - surface-mount compatible with automated PCB assembly |
Pinout & Package
Package: 100-pin Thin Quad Plastic Flatpack (TQFP), 14 mm × 14 mm body, 0.5 mm pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A15L / A0R–A15R | Left/Right Address Inputs | 16-bit address bus per port; A0–A15 required for 64K depth; fully independent addressing |
| I/O0L–I/O15L / I/O0R–I/O15R | Left/Right Data Bus | 16-bit bidirectional data path per port; byte-enable controlled by UBL/UBR and LBL/LBR |
| R/WL / R/WR | Left/Right Read/Write Control | Active-HIGH write enable; determines direction of data transfer on respective port |
| CE0L/CE1L / CE0R/CE1R | Left/Right Chip Enable Pair | Dual CE logic (CE0 ≤ VIL AND CE1 ≥ VIH) enables port; supports hierarchical enable schemes |
| OEL / OER | Left/Right Output Enable | Controls three-state output drivers; independent from R/W, enabling read-only bus sharing |
| BUSYL / BUSYR | Left/Right Busy Flag | Open-drain output indicating contention on same address; used for hardware wait-state generation |
| INTL / INTR | Left/Right Interrupt Flag | Asynchronous pulse signaling inter-port event (e.g., mailbox update); edge-triggered handshake |
| SEML / SEMR | Left/Right Semaphore Enable | Activates one of eight shared latches; controls token-based resource arbitration between ports |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enables 8-bit sub-word access (I/O8–I/O15 or I/O0–I/O7); supports mixed-width data transfers |
| M/S | Master/Slave Mode Select | Configures device as master (drives BUSY output) or slave (accepts BUSY input) for 32-bit expansion |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Independent, asynchronous access to same memory location by both ports - eliminates need for external arbitration logic |
| On-Chip Semaphore Logic | Eight shared latches with atomic set/clear - enables software-controlled mutual exclusion for shared resources |
| Hardware BUSY/INT Signaling | Dedicated open-drain flags per port - provides deterministic latency (<15 ns) for contention detection and inter-processor messaging |
| Master/Slave Expansion Mode | M/S pin configures device for 32-bit data bus scaling without discrete glue logic or separate master/slave part numbers |
| Automatic Per-Port Power-Down | CE-driven sleep entry/exit per port - reduces active current to 0.05 mA when port disabled, preserving data integrity |
Applications
| Interprocessor Communication Buffer | Real-Time Video Frame Buffer |
|---|---|
|
Use Scenario: Two microcontrollers exchange status, commands, and sensor data via shared memory without shared clock or bus master. IC Role / Device Role / Timing Role: Dual-port RAM acts as synchronized mailbox with BUSY/INT flags enabling lock-free message passing and semaphore-controlled resource access. Use Value: Eliminates software polling overhead and guarantees sub-15 ns contention detection, enabling deterministic <10 µs inter-core handshaking. |
Use Scenario: Graphics controller writes rendered frame while display controller reads previous frame - requiring zero-latency overlap. IC Role / Device Role / Timing Role: Memory serves as ping-pong frame buffer with independent read/write ports eliminating video tearing and FIFO buffering. Use Value: 15 ns access ensures pixel-clock-aligned transfers at up to 66 MHz pixel rate; byte-select enables partial-frame updates. |
| Industrial PLC I/O Mapping Memory | DSP-Based Signal Processing Buffer |
|
Use Scenario: Programmable logic controller uses one port for scan-cycle I/O image updates and second port for HMI or supervisory host access. IC Role / Device Role / Timing Role: Dual-port RAM functions as real-time I/O mirror with semaphore-protected register access and interrupt-driven change notification. Use Value: ISB3 standby current (0.05 mA) allows retention during PLC sleep modes; TQFP-100 supports dense industrial PCB layouts. |
Use Scenario: Digital signal processor streams ADC samples into RAM while simultaneously fetching FIR filter coefficients and writing processed output. IC Role / Device Role / Timing Role: Memory operates as zero-wait-state data/program buffer with independent address buses enabling concurrent coefficient fetch and sample store. Use Value: 64K × 16-bit capacity supports >1-second audio buffers at 48 kHz; 0.35-µm CMOS ensures stable operation at 5 V across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT7028S15PF | Pin-compatible 64K × 16-bit dual-port SRAM; identical 15 ns access, but uses different arbitration flag naming (BUSY vs. BSY) and lacks M/S pin for master/slave expansion. | Requires external logic for 32-bit bus expansion; suitable where only single-device use is needed. | Select IDT7028S15PF if existing board layout matches IDT footprint and expansion is not required. |
| CY7C028-20AC | Same die, slower 20 ns access time; lower ICC active current (180 mA typ.) and identical ISB3 (0.05 mA). | Acceptable in systems with relaxed timing margins; reduces power consumption by ~5% at cost of 33% longer cycle time. | Choose CY7C028-20AC for thermally constrained or battery-backed applications where 20 ns timing suffices. |
Compared with IDT7028S15PF, CY7C028-15AC offers integrated master/slave expansion and consistent Cypress flag semantics; versus CY7C028-20AC, it delivers 33% faster throughput at marginally higher active power - critical for real-time interprocessor latency budgets.
Availability
CY7C028-15AC is available at Aetrix Electronics and suitable for interprocessor communication buffers, real-time video frame storage, and industrial PLC I/O mapping requiring stable component supply and long-term industrial availability.
Supply support for CY7C028-15AC 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 high-performance memory, PSoC programmable systems-on-chip, and USB/USB-C solutions.
CY7C028 belongs to Cypress's legacy dual-port SRAM product line, designed specifically for deterministic, low-latency interprocessor and video subsystem memory interfacing in embedded control and communications equipment.
FAQ
What is the function of the M/S pin on CY7C028-15AC?
The M/S (Master/Slave) pin configures the device for 32-bit data bus expansion: when HIGH, it operates as master (driving BUSY output); when LOW, as slave (accepting BUSY input). This eliminates need for external master/slave logic or discrete devices in wide-memory systems.
How does the semaphore logic work in CY7C028-15AC?
The device contains eight shared semaphore latches, each accessible by either port via SEML/SEMR and UBL/LBL. Only one port can assert control over a given latch at a time, enabling software to implement mutual exclusion for shared memory regions or peripherals using atomic set/clear operations.
Can CY7C028-15AC retain data during power loss?
Yes - in data retention mode, holding CE ≥ VCC – 0.2V (with VCC ≥ 2.0 V) maintains stored data with ISB3 current ≤ 0.5 mA. The device guarantees retention down to 2 V supply and supports battery backup designs per its specified VCCDR and ICCDR1 parameters.
What is the difference between BUSY and INT flags?
BUSY is a dynamic contention indicator: it goes LOW when both ports attempt simultaneous access to the same address. INT is an asynchronous event flag: it pulses HIGH to signal inter-port communication (e.g., mailbox full), and is cleared by reading the associated port's status register or toggling OE.
CY7C028-15AC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 1Mbit
- Memory Organization:
- 64K x 16
- 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:
- 100-TQFP (14x14)
CY7C028-15AC FAQ
1.How can I place an order for CY7C028-15AC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C028-15AC 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 CY7C028-15AC reliable?
The price and inventory of CY7C028-15AC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C028-15AC is usually 5 days.
3.What payment methods are accepted for CY7C028-15AC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C028-15AC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C028-15AC?
CY7C028-15AC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C028-15AC 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 CY7C028-15AC?
For technical support, including CY7C028-15AC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C028-15AC requirements.
6.How does Aetrix verify that CY7C028-15AC is sourced from the original manufacturer or authorized distributors?
All CY7C028-15AC 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 CY7C028-15AC meets industry standards.
7.What is the process for return or replacement of CY7C028-15AC?
All CY7C028-15AC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C028-15AC, 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 CY7C028-15AC part is unused and in its original packaging.
Return procedure for CY7C028-15AC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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