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Infineon Technologies CY7C0251AV-25AC
- Part No.:
- CY7C0251AV-25AC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
CY7C0251AV-25AC.pdf
- Description:
- IC SRAM 144K PARALLEL 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,507
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Product details
Overview
CY7C0251AV-25AC from Cypress Semiconductor is an 8K × 18-bit true dual-port static RAM with independent left/right ports, 25 ns access time, 3.3V operation, and on-chip arbitration logic-used in interprocessor communication buffers and video frame memory where simultaneous read/write to shared memory locations is required.
For engineers reviewing the CY7C0251AV-25AC datasheet, CY7C0251AV-25AC pinout, CY7C0251AV-25AC application, or CY7C0251AV-25AC equivalent, key selection criteria include bus width (18-bit), dual-port contention resolution via BUSY/SEM/INT signals, TQFP-100 packaging, and compatibility with IDT70V25-based designs.
Technical Context
This device implements fully asynchronous dual-port architecture with separate address, data, and control buses per port (A0L–A12L/A0R–A12R, I/O0L–I/O17L/I/O0R–I/O17R), enabling concurrent access without external synchronization. Arbitration is handled internally via BUSY flag assertion within tBLA (≤12 ns) upon address match, and semaphore latches provide eight software-managed resource locks.
It supports master/slave expansion via M/S pin for 36-bit-wide memory systems; in master mode, BUSYR is output and BUSYL is input, allowing daisy-chained arbitration. Power management includes ISB3 = 10 µA (CMOS standby) and automatic per-port power-down controlled by CEL/CER.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 18-bit (144 Kbit), with A0–A12 addressing on both ports |
| Access Time | 25 ns maximum - guarantees deterministic read data valid at tACE after CE assert |
| Supply Voltage | 3.3 V ± 0.3 V - compatible with modern low-voltage digital systems and eliminates level-shifting |
| Active Current | ICC = 115 mA typical - defines thermal budget and PCB trace sizing for continuous operation |
| Standby Current | ISB3 = 10 µA typical (CMOS-level CE) - enables ultra-low-power sleep modes in battery-backed systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor control and telecom infrastructure |
| Package | 100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch) - surface-mount compatible with standard reflow profiles |
Pinout & Package
Package: 100-pin Thin Quad Flatpack (TQFP), RoHS-compliant, body size 14 mm × 14 mm, lead pitch 0.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Per-port active-low enable controlling power-down and memory access initiation |
| R/WL / R/WR | Read/Write Control (Left / Right) | Active-low signal determining direction of data transfer on respective I/O bus |
| OEL / OER | Output Enable (Left / Right) | Enables tristate output drivers independently-required for valid read data |
| A0L–A12L / A0R–A12R | Address Inputs (Left / Right) | 13-bit address bus selecting one of 8K locations per port |
| I/O0L–I/O17L / I/O0R–I/O17R | Data Bus (Left / Right) | 18-bit bidirectional data path; I/O0–I/O8 = lower byte, I/O9–I/O17 = upper byte |
| SEML / SEMR | Semaphore Enable (Left / Right) | Chip-select for eight dedicated semaphore latches used for software handshaking |
| INTL / INTR | Interrupt Flag (Left / Right) | Open-drain output signaling mailbox write from opposite port; requires external pull-up |
| BUSYL / BUSYR | Busy Flag (Left / Right) | Indicates port contention; output in master mode, input in slave mode per M/S pin state |
| M/S | Master/Slave Select | High = master (BUSY outputs); Low = slave (BUSY inputs)-enables 36-bit expansion without glue logic |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enable 9-bit byte writes: UBL/UBR controls I/O9–I/O17; LBL/LBR controls I/O0–I/O8 |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port memory cells | Enables simultaneous, independent read/write to same location-no external arbitration logic needed |
| On-chip semaphore logic (8 latches) | Provides hardware-enforced mutual exclusion for shared resources without CPU polling overhead |
| Port-to-port interrupt mailbox | Uses highest two memory addresses (1FFEh/1FFFh) for deterministic inter-processor messaging |
| Automatic per-port power-down | Reduces system power by disabling unused port circuitry while preserving data retention |
| Master/slave expansion support | Allows stacking multiple devices into 36-bit-wide memory using only M/S and BUSY interconnects |
Applications
| Communications Buffering | Video Frame Memory |
|---|---|
|
Use Scenario: Dual-processor telecom baseband subsystem exchanging packet headers and status flags across shared memory. IC Role / Device Role / Timing Role: Dual-port SRAM acts as non-blocking message buffer between DSP and ARM cores, with INT/SEM managing ownership. Use Value: Eliminates software mutex delays; 25 ns access ensures real-time header exchange meets 3GPP timing budgets. |
Use Scenario: Embedded graphics controller rendering to display while video decoder writes incoming frames. IC Role / Device Role / Timing Role: Acts as ping-pong frame buffer-left port reads current display line, right port writes next decoded line. Use Value: Prevents visual tearing by guaranteeing atomic frame swaps via BUSY-controlled arbitration. |
| Industrial Motion Control | Test Equipment Data Capture |
|
Use Scenario: PLC CPU and FPGA motion sequencer sharing trajectory parameters and encoder feedback in real time. IC Role / Device Role / Timing Role: Serves as synchronized parameter exchange hub with semaphore-protected access to axis configuration registers. Use Value: Ensures deterministic update latency (<100 ns BUSY response) for sub-millisecond servo loop closure. |
Use Scenario: High-speed logic analyzer capturing parallel bus transactions and transferring bursts to host processor. IC Role / Device Role / Timing Role: Functions as FIFO-less capture buffer-FPGA writes raw samples, ARM reads compressed blocks. Use Value: 18-bit width matches wide data buses; 10 µA ISB3 enables long idle periods between trigger events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT70V25S25PF8 | Same 8K × 18 organization, 25 ns, but uses 3.3V core + 2.5V I/O; no M/S pin; requires external arbitration for multi-device width expansion | Lacks integrated master/slave expansion and on-chip semaphores-requires additional logic for 36-bit systems | Select when legacy IDT footprint compatibility is mandatory and system design already includes external arbitration. |
| ISSI IS61WV102418BLL-25TLI | 8K × 18, 25 ns, 3.3V-only, but no BUSY/SEM/INT signals; synchronous interface only; no true dual-port arbitration | Not suitable for real-time contention scenarios-requires external controller for port coordination | Choose only for cost-sensitive, non-contention applications where software-managed access suffices. |
Compared with IDT70V25S25PF8 and IS61WV102418BLL-25TLI, CY7C0251AV-25AC delivers integrated hardware arbitration, semaphore logic, and master/slave expansion-reducing BOM count and improving determinism in tightly coupled multiprocessor systems.
Availability
CY7C0251AV-25AC is available at Aetrix Electronics and suitable for industrial motion control, telecom baseband buffering, and embedded video frame memory requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY7C0251AV-25AC 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, microcontrollers, and programmable logic solutions for industrial and communications markets.
CY7C0251AV belongs to Cypress's legacy dual-port SRAM product line, designed specifically for deterministic interprocessor communication and real-time shared-memory architectures in embedded systems.
FAQ
What is the function of the M/S pin on CY7C0251AV-25AC?
The M/S (Master/Slave) pin configures the device for word-width expansion: when HIGH, it operates as a master with BUSYR output and BUSYL input; when LOW, it functions as a slave with BUSYR input and BUSYL output. This enables direct cascading of multiple devices into 36-bit memory systems without external logic, using only BUSY signal interconnection.
How does the semaphore mechanism prevent race conditions between ports?
The CY7C0251AV-25AC provides eight dedicated semaphore latches accessible via SEML/SEMR. Each latch can be written by one port (writing '0' claims it) and read by both. The hardware ensures atomic claim/release-only the port reading '0' may modify the latch, preventing simultaneous modification and eliminating software polling loops in resource allocation.
Can CY7C0251AV-25AC operate with mixed voltage interfaces?
No. CY7C0251AV-25AC is a single-supply 3.3V device (VCC = 3.3V ± 0.3V). All I/O pins-including address, data, and control signals-are TTL-compatible at 3.3V levels. It does not support mixed 3.3V/2.5V or 3.3V/1.8V interfaces, and no internal voltage translation is provided.
What happens during simultaneous access to the same memory location?
When both ports attempt access within tPS (≤5 ns), on-chip arbitration asserts BUSY on the losing port within tBLA (≤12 ns). The winning port proceeds normally; the losing port's data remains undetermined until BUSY deasserts. No data corruption occurs-the memory cell retains its prior value until the winning port completes its cycle.
CY7C0251AV-25AC 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:
- 144Kbit
- Memory Organization:
- 8K x 18
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 25ns
- Access Time:
- 25 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-TQFP (14x14)
CY7C0251AV-25AC FAQ
1.How can I place an order for CY7C0251AV-25AC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C0251AV-25AC 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 CY7C0251AV-25AC reliable?
The price and inventory of CY7C0251AV-25AC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C0251AV-25AC is usually 5 days.
3.What payment methods are accepted for CY7C0251AV-25AC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C0251AV-25AC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C0251AV-25AC?
CY7C0251AV-25AC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C0251AV-25AC 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 CY7C0251AV-25AC?
For technical support, including CY7C0251AV-25AC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C0251AV-25AC requirements.
6.How does Aetrix verify that CY7C0251AV-25AC is sourced from the original manufacturer or authorized distributors?
All CY7C0251AV-25AC 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 CY7C0251AV-25AC meets industry standards.
7.What is the process for return or replacement of CY7C0251AV-25AC?
All CY7C0251AV-25AC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C0251AV-25AC, 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 CY7C0251AV-25AC part is unused and in its original packaging.
Return procedure for CY7C0251AV-25AC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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