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Renesas 70V261L55PF8
- Part No.:
- 70V261L55PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
70V261L55PF8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,152
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Product details
Overview
70V261L55PF8 from IDT (now Renesas) is a high-speed, low-power 16K × 16 true dual-port static RAM with independent left/right ports, 55 ns max access time, 3.3 V single supply, and integrated semaphore/interrupt/BUSY arbitration logic - used in real-time inter-processor communication systems such as telecom line cards and industrial motion controllers.
For engineers reviewing the 70V261L55PF8 datasheet, 70V261L55PF8 pinout, 70V261L55PF8 application, or 70V261L55PF8 equivalent, key selection criteria include dual-port contention resolution timing (tBDD ≤ 50 ns), ultra-low standby current (660 µW), master/slave BUSY arbitration, and 100-pin TQFP packaging for high-density PCB layouts.
Technical Context
The 70V261L55PF8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves simultaneous accesses to the same memory location using chip-enable and address-match detection - not R/W state - and asserts BUSY to stall the later-accessing port.
It integrates three coexisting coordination mechanisms: hardware semaphore flags (8 locations, addressed by A0–A2), interrupt mailbox registers (3FFEh/3FFFh), and push-pull BUSY outputs that function as write-inhibit inputs when configured as slave (M/S = VIL). All operate under TTL-compatible 3.3 V ±0.3 V supply with industrial temperature support (−40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 16K × 16 bits (256 Kbit), true dual-port SRAM with independent left/right address/data/control paths |
| Access Time (tAA) | 55 ns max - defines minimum clock-to-data delay for synchronous interface designs or worst-case latency in async bus systems |
| Supply Voltage | 3.3 V ±0.3 V - requires single-rail power delivery; no level-shifting needed for 3.3 V logic families |
| Standby Current (ISB3) | 0.2 mA typ. - enables ultra-low-power hold mode when both ports are disabled with CMOS-level inputs |
| Operating Temperature | −40°C to +85°C - qualified for industrial embedded applications without derating |
| Package | 100-pin TQFP (14 mm × 14 mm × 1.4 mm) - surface-mount compatible with standard reflow profiles |
| BUSY Arbitration Delay (tBDD) | 50 ns max - guarantees valid read data appears within 50 ns after BUSY deassertion, critical for deterministic response in real-time systems |
Pinout & Package
70V261L55PF8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. Pin 1 is marked via corner notch; all VCC and GND pins must be connected per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low enable per port; controls port power-down and memory access permission independently |
| R/WL / R/WR | Read/Write Control (Left / Right) | Active-low signal determining direction of data transfer on respective port's I/O bus |
| OEL / OER | Output Enable (Left / Right) | Active-low tri-state control for I/O drivers; allows shared bus usage without external bus transceivers |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enables byte-wise writes (I/O0–I/O7 or I/O8–I/O15) - essential for multiplexed 8-bit data bus compatibility |
| SEML / SEMR | Semaphore Enable | Active-low control to access 8 semaphore flag registers (A0–A2); decouples semaphore operations from main memory space |
| INTL / INTR | Interrupt Flag Output | Open-drain-compatible push-pull outputs indicating mailbox writes (3FFEh/3FFFh); require no pull-up for basic use |
| BUSYL / BUSYR | Busy Flag (Master Output / Slave Input) | When M/S = VIH: push-pull output signaling contention; when M/S = VIL: write-inhibit input - enables scalable multi-device arrays |
| M/S | Master/Slave Select | Configures device role: VIH → BUSY outputs active; VIL → BUSY inputs active - required for width expansion with arbitration |
| A0L–A13L / A0R–A13R | Address Inputs (Left / Right) | 14-bit address buses supporting full 16K-word addressing per port; no internal address latching |
| I/O0L–I/O15L / I/O0R–I/O15R | Data I/O (Left / Right) | 16-bit bidirectional data buses with separate upper/lower byte control - supports 32-bit+ word systems via cascading |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Simultaneous independent read/write to same memory location permitted - eliminates software polling or lock-step synchronization |
| Hardware Semaphore Logic | Eight dedicated binary flags (A0–A2) with atomic read/write - prevents race conditions during resource allocation between processors |
| Master/Slave BUSY Arbitration | Single-master multi-slave configuration enables scalable memory width expansion without external arbitration logic |
| Integrated Interrupt Mailboxes | Two dedicated addresses (3FFEh/3FFFh) serve as hardware-triggered inter-processor notification registers - reduces ISR latency vs. polling |
| Ultra-Low Standby Power | 660 µW typical ISB3 - enables always-on monitoring functions in battery-backed or energy-constrained industrial nodes |
Applications
| Telecom Line Card Control | Industrial Motion Controller |
|---|---|
|
Use Scenario: Two DSPs coordinate packet buffering and protocol processing on a TDM backplane, sharing status tables and command queues. IC Role / Device Role / Timing Role: 70V261L55PF8 serves as shared memory with hardware arbitration - enabling zero-latency inter-DSP handshaking via semaphores and interrupts. Use Value: Eliminates need for external arbitration logic and reduces inter-processor message latency to <50 ns (tBDD), improving real-time determinism. |
Use Scenario: PLC CPU and motion ASIC exchange trajectory parameters and encoder feedback in closed-loop servo systems. IC Role / Device Role / Timing Role: 70V261L55PF8 acts as deterministic shared buffer - BUSY signals prevent concurrent writes to position registers during axis synchronization. Use Value: Guarantees atomic updates to motion control variables without software locks, reducing jitter in 1 kHz servo cycles. |
| Medical Imaging Subsystem | Avionics Data Concentrator |
|
Use Scenario: FPGA-based image preprocessor and ARM host processor share raw sensor frames and metadata buffers in ultrasound equipment. IC Role / Device Role / Timing Role: 70V261L55PF8 provides non-blocking memory access - INTL/INTR flags notify host of frame readiness without polling overhead. Use Value: Reduces host CPU utilization by >30% versus polled DMA, freeing cycles for real-time beamforming calculations. |
Use Scenario: Multiple ARINC 429 receivers and a safety-critical flight management unit share sensor fusion data in airborne computing modules. IC Role / Device Role / Timing Role: 70V261L55PF8 operates as fault-tolerant shared memory - M/S-configured slaves ensure write-inhibit during BUSY assertion for DO-254 compliance. Use Value: Enables deterministic contention resolution meeting RTCA/DO-178C Level A timing requirements (<100 ns worst-case arbitration). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C028V-55AXC | 55 ns access, 16K × 16, but lacks integrated semaphore logic and uses open-drain BUSY - requires external pull-ups and discrete arbitration logic | Requires additional components for semaphore/interrupt functionality; less suitable for tightly coupled dual-CPU systems | Choose when legacy Cypress footprint compatibility is required and system software handles arbitration |
| AS7C31026B-55PCN | 55 ns access, 16K × 16, but only supports asynchronous single-port operation - no dual-port arbitration or BUSY logic | Cannot replace 70V261L55PF8 in true dual-access scenarios; limited to buffered memory or ping-pong architectures | Consider only for cost-sensitive applications where dual-port concurrency is unnecessary |
Compared with CY7C028V-55AXC and AS7C31026B-55PCN, the 70V261L55PF8 uniquely integrates hardware semaphore, interrupt mailbox, and master/slave BUSY arbitration - eliminating up to 12 discrete logic ICs and reducing PCB area by 28% in inter-processor communication designs.
Availability
70V261L55PF8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, medical imaging subsystems, and avionics data concentrators requiring stable component supply across extended product lifecycles.
Supply support for 70V261L55PF8 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 microcontrollers, analog, power management, and high-performance memory solutions for industrial, automotive, and communications markets.
The 70V261L55PF8 belongs to IDT's legacy high-speed dual-port SRAM family, engineered specifically for deterministic inter-processor communication in real-time embedded systems where hardware-coordinated memory access is mandatory.
FAQ
What is the maximum operating temperature range for the 70V261L55PF8?
The 70V261L55PF8 is rated for industrial temperature operation from −40°C to +85°C. This specification is validated across all electrical parameters including access time (tAA ≤ 55 ns), BUSY arbitration timing (tBDD ≤ 50 ns), and standby current (ISB3 ≤ 0.2 mA typ.), making it suitable for harsh-environment deployments without thermal derating.
How does the M/S pin affect BUSY pin functionality in the 70V261L55PF8?
When M/S = VIH, BUSYL and BUSYR function as push-pull outputs indicating port contention; when M/S = VIL, they become write-inhibit inputs - enabling master/slave configurations for memory width expansion. This dual-mode behavior is intrinsic to the 70V261L55PF8 architecture and requires no external logic to implement scalable multi-device arrays.
Can the 70V261L55PF8 support byte-selective writes without external logic?
Yes, the 70V261L55PF8 supports independent upper- and lower-byte writes via UBL/LBL and UBR/LBR pins. When UBL = LBL = VIH, both bytes are deselected (power-down); when only UBL = VIL, only I/O8–I/O15 are written - enabling native 8-bit bus compatibility without glue logic or bus transceivers.
What are the exact memory addresses used for interrupt mailbox functionality in the 70V261L55PF8?
The 70V261L55PF8 uses fixed addresses 3FFEh (hex) to assert INTL and 3FFFh (hex) to assert INTR. Writing to 3FFEh with CER = R/WR = VIL triggers INTL; reading 3FFFh with CEL = OEL = VIL clears INTR. These locations reside within the main 16K × 16 memory map and retain user-defined data - no separate register space is required.
Does the 70V261L55PF8 require external pull-up resistors on BUSY or interrupt pins?
No, the 70V261L55PF8 features push-pull BUSY and interrupt outputs (INTL/INTR) that drive actively high or low - eliminating need for external pull-up resistors. This simplifies board design and ensures reliable signal integrity in noisy industrial environments without additional BOM cost or layout complexity.
70V261L55PF8 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:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-TQFP (14x14)
70V261L55PF8 FAQ
1.How can I place an order for 70V261L55PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V261L55PF8 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 70V261L55PF8 reliable?
The price and inventory of 70V261L55PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V261L55PF8 is usually 5 days.
3.What payment methods are accepted for 70V261L55PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V261L55PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V261L55PF8?
70V261L55PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V261L55PF8 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 70V261L55PF8?
For technical support, including 70V261L55PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V261L55PF8 requirements.
6.How does Aetrix verify that 70V261L55PF8 is sourced from the original manufacturer or authorized distributors?
All 70V261L55PF8 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 70V261L55PF8 meets industry standards.
7.What is the process for return or replacement of 70V261L55PF8?
All 70V261L55PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V261L55PF8, 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 70V261L55PF8 part is unused and in its original packaging.
Return procedure for 70V261L55PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V261L55PF8 Tags
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