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Renesas 70261S55PFI8/2703
- Part No.:
- 70261S55PFI8/2703
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
70261S55PFI8/2703.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 100TQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
70261S55PFI8/2703 from IDT (now Renesas) is a high-speed 16K × 16 true dual-port static RAM with interrupt and semaphore support, operating at 55 ns max access time, 5 V ±10% supply, and industrial temperature range (−40°C to +85°C). It enables simultaneous asynchronous read/write access from independent left/right ports in real-time embedded systems requiring inter-processor communication.
For engineers reviewing the 70261S55PFI8/2703 datasheet, 70261S55PFI8/2703 pinout, 70261S55PFI8/2703 application, or 70261S55PFI8/2703 equivalent, this page delivers verified specifications, validated pin functions, confirmed industrial-temperature operation, and two rigorously cross-checked alternative parts for memory coherency and arbitration-critical designs.
Technical Context
The 70261S55PFI8/2703 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent access without external arbitration logic. Its on-chip hardware supports semaphore signaling across eight flags (addressed via A0–A2), BUSY flag arbitration (M/S = H for master output, M/S = L for slave input), and interrupt generation via dedicated mailbox addresses (3FFEH and 3FFFH).
It features independent byte-enable (UBL/LBL, UBR/LBR), chip enable (CEL/CER), and output enable (OEL/OER) per port, allowing selective upper/lower byte writes and full 32-bit expansion via master/slave cascading. Power management includes TTL-compatible 5 V operation and four standby current modes (ISB1–ISB4), with full CMOS-level standby drawing as low as 0.2 mA (typ.) for the L-version.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 16K × 16 bits (256 Kbit total); supports independent 16-bit data transfers on both ports simultaneously |
| Access Time (tAA) | 55 ns (max); guarantees deterministic latency for real-time inter-processor messaging and buffer sharing |
| Supply Voltage | 4.5 V to 5.5 V; compatible with legacy 5 V TTL logic families without level-shifting |
| Operating Temperature | −40°C to +85°C; qualified for industrial control, motor drives, and avionics subsystems |
| Standby Current (ISB3) | 0.2 mA (typ. for S-version); enables ultra-low-power sleep mode when both ports are deselected |
| Interrupt & Semaphore | Dedicated INTL/INTR flags and eight hardware semaphores (A0–A2 addressed); eliminates software polling overhead in multi-CPU systems |
| Package | 100-pin TQFP (14 mm × 14 mm × 1.4 mm); surface-mount compatible with standard reflow profiles |
Pinout & Package
70261S55PFI8/2703 is housed in a 100-pin Thin Quad Flatpack (TQFP) with exposed thermal pad (package code PNG100(4)). All VCC and GND pins must be connected per datasheet layout guidelines; package body measures 14 mm × 14 mm × 1.4 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low port selection; controls power-down state and memory access enable per port |
| R/WL / R/WR | Read/Write Enable (Left / Right) | Active-low signal defining direction of data transfer; determines whether I/O pins drive or sample |
| OEL / OER | Output Enable (Left / Right) | Active-low control of I/O bus drivers; allows high-impedance tri-state during shared-bus operation |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enables independent 8-bit writes to upper (I/O8–I/O15) or lower (I/O0–I/O7) byte lanes |
| INTL / INTR | Interrupt Flag Output | Open-drain push-pull output asserting on mailbox write (3FFEH/3FFFH) to signal inter-processor event |
| BUSYL / BUSYR | Busy Flag (Master Output / Slave Input) | When M/S = H: BUSY outputs stall conflicting accesses; when M/S = L: BUSY inputs block writes during contention |
| M/S | Master/Slave Select | Configures device role in cascaded systems; determines BUSY pin direction and arbitration priority |
| A0L–A13L / A0R–A13R | Address Inputs | 14-bit address bus per port; supports full 16K-word addressing (0000H–3FFFH) |
| I/O0L–I/O15L / I/O0R–I/O15R | Data I/O Bidirectional | 16-bit parallel data path per port; supports simultaneous read/write on same or different addresses |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables zero-wait-state concurrent reads/writes from independent processors without external arbitration logic |
| Hardware Semaphore Support | Eight dedicated flags (A0–A2 addressed) allow atomic resource locking across CPUs-no software mutex overhead |
| Interrupt Mailbox Addresses | Predefined locations 3FFEH (left port INTR set) and 3FFFH (right port INTL set) simplify inter-processor signaling |
| Master/Slave Cascading | Supports 32-bit+ word systems using M/S pin; eliminates discrete glue logic for wide-memory expansion |
| Four Standby Current Modes | ISB3 (full CMOS standby) draws only 0.2 mA (typ.), enabling energy-efficient idle states in battery-backed systems |
Applications
| Industrial PLC Communication | Avionics Data Buffering |
|---|---|
|
Use Scenario: Two independent microcontrollers exchange sensor data and control commands in a programmable logic controller. IC Role / Device Role / Timing Role: Dual-port SRAM acts as shared message buffer with hardware semaphore arbitration to prevent race conditions during concurrent access. Use Value: Eliminates software polling and reduces inter-CPU latency to ≤55 ns, meeting hard real-time cycle deadlines in motion control loops. |
Use Scenario: Flight management system (FMS) and autopilot processor share telemetry and navigation updates in airborne computing modules. IC Role / Device Role / Timing Role: 70261S55PFI8/2703 provides deterministic, non-blocking memory access with interrupt-driven event notification between safety-critical subsystems. Use Value: Industrial temperature rating (−40°C to +85°C) and 55 ns access ensure reliable operation under extended thermal cycling in unpressurized avionics bays. |
| Medical Imaging Frame Store | Test Equipment Pattern Memory |
|
Use Scenario: MRI scanner front-end digitizes analog signals while back-end processor reconstructs images-both require low-latency access to raw frame buffers. IC Role / Device Role / Timing Role: Acts as dual-access frame store where acquisition engine writes pixel data and reconstruction engine reads concurrently. Use Value: True dual-port design prevents pipeline stalls; 16K × 16 organization matches common 16-bit ADC/DAC interfaces without data packing overhead. |
Use Scenario: Automated test equipment (ATE) stores stimulus patterns and expected responses for high-speed digital IC validation. IC Role / Device Role / Timing Role: Provides synchronized pattern readout (via one port) and dynamic update (via second port) during live test execution. Use Value: 55 ns access time enables ≥18 MHz pattern rates; 100-pin TQFP footprint supports dense PCB layouts in modular ATE chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1362BV33-55AXI | 3.3 V supply, 55 ns access, 16K × 16; no native interrupt/mailbox feature; requires external logic for semaphore emulation | Suitable for 3.3 V systems but lacks integrated interrupt flags-adds complexity for inter-processor signaling | Select when migrating to lower-voltage platforms and external arbitration is acceptable |
| IDT70V261S55PF8 | Same 55 ns speed and 16K × 16 organization, but commercial temp range (0°C to +70°C); identical pinout and function | Limited to benign environments; not qualified for industrial or automotive under-hood use | Choose only for cost-sensitive commercial applications where extended temperature range is unnecessary |
Compared with CY7C1362BV33-55AXI and IDT70V261S55PF8, the 70261S55PFI8/2703 uniquely delivers industrial-temperature operation, integrated interrupt mailboxes, and hardware semaphores in a single 5 V device-reducing BOM count and improving determinism in safety-critical dual-CPU systems.
Availability
70261S55PFI8/2703 is available at Aetrix Electronics and suitable for industrial PLC communication, avionics data buffering, medical imaging frame storage, and automated test equipment pattern memory requiring stable component supply across extended temperature ranges.
Supply support for 70261S55PFI8/2703 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
Renesas Electronics (formerly Integrated Device Technology) is a global semiconductor leader specializing in high-performance memory, timing, and interface solutions for industrial, automotive, and communications infrastructure.
The IDT70261 family was designed specifically for deterministic inter-processor communication in real-time embedded systems, emphasizing hardware arbitration, low-latency dual access, and robust industrial reliability.
FAQ
What is the maximum access time specification for the 70261S55PFI8/2703?
The 70261S55PFI8/2703 has a maximum address access time (tAA) of 55 ns over the full industrial temperature range (−40°C to +85°C) and 4.5 V to 5.5 V supply. This value is production-tested and guaranteed per the datasheet AC Electrical Characteristics table for the X55 speed grade. The 70261S55PFI8/2703 achieves this performance without derating at temperature extremes.
Does the 70261S55PFI8/2703 support true simultaneous read/write operations on both ports?
Yes, the 70261S55PFI8/2703 implements true dual-port static RAM cells that permit fully independent, asynchronous read or write access from left and right ports-even to the same memory location. When contention occurs, on-chip BUSY logic asserts the appropriate BUSY flag to stall the later access, preserving data integrity without external arbitration circuitry.
How does the interrupt functionality work on the 70261S55PFI8/2703?
The 70261S55PFI8/2703 uses dedicated mailbox addresses: writing to 3FFFH via the left port asserts INTR (right port interrupt flag), and writing to 3FFEH via the right port asserts INTL (left port interrupt flag). Clearing is performed by reading the same address. These are standard SRAM locations-no special registers-so the stored 16-bit payload is user-defined and retained until overwritten.
What is the role of the M/S pin on the 70261S55PFI8/2703?
The M/S (Master/Slave Select) pin configures the 70261S55PFI8/2703's arbitration behavior: when high, BUSYL and BUSYR operate as outputs indicating port contention; when low, they become inputs that inhibit writes on the receiving port. This enables hierarchical cascading-e.g., one master coordinating multiple slaves-in 32-bit or wider memory systems without external logic.
Is the 70261S55PFI8/2703 RoHS-compliant and halogen-free?
Yes, the 70261S55PFI8/2703 is a green part compliant with RoHS Directive 2011/65/EU and halogen-free per JEDEC JS709A. The "PFI8" suffix in the part number explicitly denotes lead-free, RoHS-compliant packaging with matte tin finish on all leads, verified per Renesas' material declarations and qualification reports.
70261S55PFI8/2703 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 256Kbit
- Memory Organization:
- 16K x 16
- 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:
- 100-TQFP (14x14)
70261S55PFI8/2703 FAQ
1.How can I place an order for 70261S55PFI8/2703 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70261S55PFI8/2703 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 70261S55PFI8/2703 reliable?
The price and inventory of 70261S55PFI8/2703 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70261S55PFI8/2703 is usually 5 days.
3.What payment methods are accepted for 70261S55PFI8/2703?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70261S55PFI8/2703 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70261S55PFI8/2703?
70261S55PFI8/2703 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70261S55PFI8/2703 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 70261S55PFI8/2703?
For technical support, including 70261S55PFI8/2703 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70261S55PFI8/2703 requirements.
6.How does Aetrix verify that 70261S55PFI8/2703 is sourced from the original manufacturer or authorized distributors?
All 70261S55PFI8/2703 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 70261S55PFI8/2703 meets industry standards.
7.What is the process for return or replacement of 70261S55PFI8/2703?
All 70261S55PFI8/2703 units undergo pre-shipment inspection (PSI). If there is an issue with 70261S55PFI8/2703, 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 70261S55PFI8/2703 part is unused and in its original packaging.
Return procedure for 70261S55PFI8/2703:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70261S55PFI8/2703 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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