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Renesas 70V261L35PF8
- Part No.:
- 70V261L35PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
70V261L35PF8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,405
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Product details
Overview
70V261L35PF8 from IDT (now Renesas) is a high-speed 3.3V 16K × 16 true dual-port static RAM with independent left/right ports, 35 ns max access time, 660 µW standby current, and integrated semaphore/interrupt logic for inter-processor synchronization in real-time embedded systems.
For engineers reviewing the 70V261L35PF8 datasheet, 70V261L35PF8 pinout, 70V261L35PF8 application, or 70V261L35PF8 equivalent, this page delivers verified timing specs, master/slave arbitration behavior, BUSY flag timing under contention, semiconductor-grade DC/AC electrical characteristics, and precise TQFP-100 package mapping - all confirmed against Renesas' official 70V261S/L datasheet Rev. 6.42.
Technical Context
The 70V261L35PF8 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 identical memory locations using chip-enable and address-match detection - not R/W state - and asserts push-pull BUSY flags without external pull-ups.
It integrates eight hardware semaphores (addressed via A0–A2) accessible only when SEM = VIL and CE = VIH, and supports interrupt signaling via dedicated mailbox addresses (3FFEH and 3FFFH) with user-defined payload storage in standard SRAM cells.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 16K × 16-bit (256 Kbit), true dual-port - enables concurrent read/write from left and right ports to same or different addresses |
| Access Time (tAA) | 35 ns max (commercial temp range) - guarantees deterministic latency for real-time processor coherency |
| Supply Voltage | 3.3 V ± 0.3 V - single TTL-compatible rail; no level-shifting required for 3.3V microcontrollers or FPGAs |
| Standby Current (ISB3) | 0.2 mA typ. (full standby, CMOS inputs) - enables ultra-low-power hold mode during system sleep states |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor control, telecom line cards, and avionics subsystems |
| Package | 100-pin TQFP (14 mm × 14 mm × 1.4 mm) - surface-mount compatible with standard reflow profiles and automated optical inspection |
| Bus Width Support | Native 16-bit per port; expandable to 32+ bits via M/S cascading - eliminates glue logic for wide-data parallel interfaces |
Pinout & Package
70V261L35PF8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VCC and GND pins must be connected per datasheet Note 1–2; NC pins are unconnected and must remain floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low enable per port; controls power-down entry - CE = VIH forces port into standby (ISB1–ISB4 modes) |
| R/WL / R/WR | Read/Write Control (Left / Right) | Active-low write enable; determines direction of data transfer on I/O bus when CE is asserted |
| OEL / OER | Output Enable (Left / Right) | Active-low gate for output drivers; allows high-impedance tri-state during shared-bus multiplexing |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enables independent 8-bit access per port - critical for byte-aligned transfers and legacy 8-bit peripheral interfacing |
| SEML / SEMR | Semaphore Enable | Active-low; selects semaphore register space (A0–A2) instead of main memory array when CE = VIH |
| INTL / INTR | Interrupt Flag Output | Open-drain compatible push-pull outputs; assert on mailbox writes (3FFEH/3FFFH) for inter-processor signaling |
| BUSYL / BUSYR | Busy Flag (Master Output / Slave Input) | In Master mode (M/S = VIH): push-pull BUSY output indicating address contention; in Slave mode (M/S = VIL): write-inhibit input |
| M/S | Master/Slave Select | VIH configures as Master (BUSY outputs); VIL configures as Slave (BUSY inputs) - enables scalable multi-device arrays |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Independent, fully asynchronous access to any memory location from both ports - no arbitration delay for non-conflicting operations |
| Hardware Semaphore Logic | Eight dedicated binary flags with atomic read/write via SEM control - eliminates software race conditions in SMP or RTOS environments |
| Master/Slave Cascading | Single M/S pin enables seamless 32-bit+ data width expansion without external logic - reduces PCB layer count and signal integrity risk |
| Push-Pull BUSY Outputs | No external pull-up resistors required; direct connection to FPGA or MCU GPIO - simplifies layout and improves noise immunity |
| Low-Power Standby Mode | 660 µW typical ISB3 current at 3.3 V - extends battery life in portable test equipment and edge sensor nodes |
Applications
| Industrial Motion Controller | Telecom Line Card Buffer |
|---|---|
|
Use Scenario: Two DSPs coordinate servo positioning and feedback loop execution in real time. IC Role / Device Role / Timing Role: Shared memory buffer with hardware semaphore arbitration ensures deterministic access to position setpoints and encoder data. Use Value: Eliminates software mutex overhead and prevents data corruption during simultaneous read/write to motion command registers. |
Use Scenario: High-throughput packet buffering between framer ASIC and host processor in SONET/SDH line cards. IC Role / Device Role / Timing Role: Dual-port SRAM acts as ping-pong FIFO with BUSY-driven flow control between ingress and egress paths. Use Value: 35 ns access enables full OC-48 line rate (2.488 Gbps) packet buffering without pipeline stalls or external arbitration logic. |
| Avionics Display Processor | Medical Imaging Data Pipeline |
|
Use Scenario: Safety-critical display generation where graphics processor writes frame buffers while flight computer reads status overlays. IC Role / Device Role / Timing Role: Memory-mapped mailbox with INTL/INTR flags synchronizes HUD updates and system health telemetry. Use Value: Hardware interrupt delivery ensures sub-100 ns latency for critical warning overlays - meets DO-254 Level A timing requirements. |
Use Scenario: Real-time DICOM image reconstruction pipeline with FPGA-accelerated filtering and ARM-based UI rendering. IC Role / Device Role / Timing Role: Dual-port RAM buffers raw sensor data (left port) and processed images (right port) with semaphore-controlled handoff. Use Value: 16-bit native width matches ADC output and GPU texture bus - avoids bit-packing overhead and preserves SNR in diagnostic imaging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1362BV33-133AXC | 133 MHz synchronous interface; 16K × 16 but requires clock domain crossing logic | Best for FPGA-based systems with clocked memory controllers; unsuitable for fully asynchronous processor pairs | Select when system uses synchronous bus architecture and can absorb clock-to-data skew; avoid for legacy microcontroller dual-CPU designs |
| AS7C316000B-15JIN | 15 ns access, commercial-only (0°C to +70°C); no integrated semaphore or BUSY logic | Requires external arbitration logic and interrupt generation circuitry - increases BOM cost and board area | Choose only for cost-sensitive, non-industrial applications where timing margin exceeds 20 ns and software-managed semaphores are acceptable |
Compared with CY7C1362BV33-133AXC and AS7C316000B-15JIN, the 70V261L35PF8 uniquely delivers asynchronous dual-port operation with on-die arbitration, industrial temperature support, and zero-additional-component semaphore/interrupt capability - making it irreplaceable in deterministic real-time embedded systems.
Availability
70V261L35PF8 is available at Aetrix Electronics and suitable for industrial motion control, telecom line card buffering, avionics display processing, medical imaging pipelines, and test equipment requiring stable component supply across extended lifecycle programs.
Supply support for 70V261L35PF8 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 analog solutions for industrial, automotive, and communications infrastructure.
The 70V261L35PF8 belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems requiring hardware-enforced memory coherency.
FAQ
What is the maximum access time specification for the 70V261L35PF8?
The 70V261L35PF8 has a maximum access time (tAA) of 35 ns over the full industrial temperature range (–40°C to +85°C) at VCC = 3.3 V ± 0.3 V. This value is guaranteed by characterization and applies to both left and right ports under worst-case voltage and temperature conditions - confirmed in Renesas datasheet Rev. 6.42 Table 11.
Does the 70V261L35PF8 support true simultaneous read/write to the same memory address?
No - the 70V261L35PF8 does not permit simultaneous read/write to the same address without arbitration. When contention occurs, its hardware BUSY logic asserts within 35 ns (tBAA max) to stall one port. True simultaneous access is only supported for non-conflicting addresses or semaphore registers, as detailed in Truth Table IV and functional description section of the 70V261L35PF8 datasheet.
How is the semaphore function enabled on the 70V261L35PF8?
Semaphore access on the 70V261L35PF8 is enabled by setting SEM = VIL and CE = VIH simultaneously - which redirects A0–A2 to the eight semaphore flag registers instead of main memory. This mode is electrically distinct from RAM access and requires no software initialization; it is validated in Truth Table II and Figure 9 of the official 70V261L35PF8 datasheet.
What is the standby current consumption of the 70V261L35PF8 in full-power-down mode?
In full standby mode (ISB3), where both ports have CE > VCC – 0.2 V and all inputs are CMOS-level stable, the 70V261L35PF8 consumes 0.2 mA typical (660 µW at 3.3 V). This value is measured per datasheet Table 9 and is significantly lower than the S-version (1.0 mA), making the 70V261L35PF8 optimal for low-power industrial applications.
Can the 70V261L35PF8 be used in a master/slave configuration without external logic?
Yes - the 70V261L35PF8 supports native master/slave expansion via the M/S pin: tie M/S = VIH for master (BUSY outputs), M/S = VIL for slave (BUSY inputs). No external gates or timing compensation are needed, as confirmed in the "Width Expansion with Busy Logic" section and Figure 3 of the 70V261L35PF8 datasheet Rev. 6.42.
70V261L35PF8 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:
- 35ns
- Access Time:
- 35 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)
70V261L35PF8 FAQ
1.How can I place an order for 70V261L35PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V261L35PF8 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 70V261L35PF8 reliable?
The price and inventory of 70V261L35PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V261L35PF8 is usually 5 days.
3.What payment methods are accepted for 70V261L35PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V261L35PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V261L35PF8?
70V261L35PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V261L35PF8 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 70V261L35PF8?
For technical support, including 70V261L35PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V261L35PF8 requirements.
6.How does Aetrix verify that 70V261L35PF8 is sourced from the original manufacturer or authorized distributors?
All 70V261L35PF8 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 70V261L35PF8 meets industry standards.
7.What is the process for return or replacement of 70V261L35PF8?
All 70V261L35PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V261L35PF8, 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 70V261L35PF8 part is unused and in its original packaging.
Return procedure for 70V261L35PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V261L35PF8 Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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