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Renesas 70V631S15PRFI8

Name: 70V631S15PRFI8
Brand: Renesas
SKU: 70V631S15PRFI8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70V631S15PRFI8

Manufacturer:: Renesas

Category:: Memory

Package:: 128-LQFP

Datasheet:: 70V631S15PRFI8.pdf

Description:: IC SRAM 4.5MBIT PARALLEL 128TQFP

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Product details

Overview

70V631S15PRFI8 from IDT (now Renesas) is a high-speed 256K × 18 asynchronous dual-port static RAM with fully independent left/right ports, 15 ns max access time (commercial grade), 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port via OPT pins. It enables simultaneous read/write to the same memory location in real-time systems such as telecom line cards and industrial motion controllers.

For engineers reviewing the 70V631S15PRFI8 datasheet, 70V631S15PRFI8 pinout, 70V631S15PRFI8 application, or 70V631S15PRFI8 equivalent, key selection considerations include true dual-port arbitration logic, on-chip semaphore support for inter-processor synchronization, BUSY flag timing (tBAA ≤ 15 ns), and compatibility with 128-pin TQFP, 208-ball BGA, and 256-ball BGA packages.

Technical Context

This device implements fully asynchronous operation on both ports with separate byte controls (UBL/LBR, UBL/LBL), independent chip enables (CE0L/CE1L, CE0R/CE1R), and dedicated R/W, OE, and address buses. Port arbitration is handled entirely in hardware using BUSY and semaphore logic-no external glue logic required for master/slave cascading.

The 70V631S15PRFI8 supports JTAG IEEE 1149.1 boundary-scan testing, though JTAG is omitted in the 128-pin TQFP variant. Its dual-voltage I/O architecture allows mixed 2.5 V/3.3 V system interfacing: VDDQX is set per port by OPTL/OPTR, while VDD remains fixed at 3.3 V ±150 mV.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	256K × 18 bits (4,608 Kbit total); enables 36-bit+ word expansion via Master/Slave mode
Access Time (max)	15 ns - guarantees worst-case read latency for commercial-grade timing-critical control loops
Core Supply	3.3 V ±150 mV - powers internal logic; requires all VDD pins tied to 3.3 V
I/O Supply Options	Selectable 3.3 V ±150 mV or 2.5 V ±100 mV per port via OPTL/OPTR - enables mixed-voltage bus interfacing
Operating Temperature	–40°C to +85°C (industrial grade) - validated for embedded industrial and telecom environments
Port Arbitration	Hardware-based BUSY flag and semaphore logic - eliminates software overhead for inter-processor memory coordination
Package Options	128-pin TQFP (PK-128), 208-ball BGA (BF208), 256-ball BGA (BC256) - footprint flexibility for density vs. manufacturability trade-offs

Pinout & Package

70V631S15PRFI8 is available in three package variants: 128-pin TQFP (PK-128), 208-ball fine-pitch BGA (BF208), and 256-ball BGA (BC256). The PRFI8 suffix denotes the 128-pin TQFP industrial-grade variant with lead-free (Pb-free) and RoHS-compliant construction.

Pin/Terminal	Circuit Role	Design Meaning
A0L–A17L / A0R–A17R	Address Inputs (Left/Right)	18-bit address per port; supports full 256K × 18 addressing without external decoding
I/O0L–I/O17L / I/O0R–I/O17R	Bidirectional Data Bus (Left/Right)	18-bit parallel data path per port; supports byte-level access via UBL/LBL and UBR/LBR
CE0L, CE1L / CE0R, CE1R	Chip Enable Pairs	Dual CE per port enables depth expansion without external logic; CE0X = VIL & CE1X = VIH activates port X
R/WL / R/WR	Read/Write Control	Active-low write enable; determines direction of data flow on respective I/O bus
OEL / OER	Output Enable	Controls tri-state output drivers; required for read operations and bus sharing
BUSYL / BUSYR	Busy Flag (Master Output / Slave Input)	M/S = VIH → BUSYX is output; M/S = VIL → BUSYX is input; resolves port contention in real time
SEML / SEMR	Semaphore Enable	Enables hardware semaphore register access (A0–A2) for inter-processor signaling
INTL / INTR	Interrupt Flag	Open-drain totem-pole output; asserts on write to specific addresses (e.g., 3FFFE/3FFFF) for event notification
OPTL / OPTR	I/O Voltage Select	VIL = 2.5 V I/O mode; VIH = 3.3 V I/O mode; sets VDDQX supply requirement independently per port
M/S	Master/Slave Select	VIH configures as Master (BUSY output); VIL configures as Slave (BUSY input); enables cascaded 36-bit+ systems

Key Features

Feature	Design Value
True Dual-Port Memory Cells	Enables simultaneous, independent read/write access to identical memory locations - essential for real-time co-processing
On-Chip Port Arbitration Logic	Hardware-resolved BUSY assertion eliminates need for external arbitration circuitry or software polling
Full Semaphore Support	Eight dedicated flags accessible via A0–A2; enables atomic lock/unlock between processors without shared memory corruption
Dual-Voltage I/O Per Port	OPTL/OPTR pins configure each port for 2.5 V or 3.3 V signaling - simplifies integration into heterogeneous voltage domains
Depth Expansion Capability	Dual CE pairs and M/S pin allow seamless cascading of multiple devices for >18-bit data widths without external logic

Applications

Telecom Line Card Buffering	Industrial Motion Controller Shared Memory
Use Scenario: High-throughput packet buffering between DSP and FPGA in a 10Gbps line card, requiring deterministic latency and concurrent access. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-wait-state shared memory buffer; left port interfaces DSP, right port interfaces FPGA. Use Value: 15 ns access time ensures sub-20 ns round-trip latency; hardware BUSY arbitration prevents data collision during simultaneous read/write bursts.	Use Scenario: Coordinating position feedback and trajectory commands between servo drive microcontroller and motion FPGA in CNC equipment. IC Role / Device Role / Timing Role: Acts as synchronized shared workspace; left port writes command data, right port reads status updates. Use Value: On-chip semaphore registers eliminate software mutex overhead; industrial temperature rating ensures reliability in factory-floor thermal environments.
Automotive ADAS Sensor Fusion Hub	Medical Imaging Real-Time Frame Buffer
Use Scenario: Aggregating radar, camera, and LiDAR data streams in an autonomous driving ECU before fusion processing. IC Role / Device Role / Timing Role: Dual-port RAM buffers raw sensor frames; one port receives DMA writes, the other serves CPU reads. Use Value: Independent 2.5 V/3.3 V I/O per port matches mixed-voltage sensor interface standards; 12 ns industrial-grade timing meets ASIL-B timing constraints.	Use Scenario: Storing uncompressed ultrasound or MRI frame data during acquisition, where lossless real-time transfer is mandatory. IC Role / Device Role / Timing Role: Serves as ping-pong frame buffer; left port captures incoming scan lines, right port feeds display engine. Use Value: 256K × 18 capacity holds full HD frame (1920×1080×16-bit) with margin; asynchronous operation avoids clock domain crossing issues.

Telecom Line Card Buffering

Industrial Motion Controller Shared Memory

Use Scenario: High-throughput packet buffering between DSP and FPGA in a 10Gbps line card, requiring deterministic latency and concurrent access.

IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-wait-state shared memory buffer; left port interfaces DSP, right port interfaces FPGA.

Use Value: 15 ns access time ensures sub-20 ns round-trip latency; hardware BUSY arbitration prevents data collision during simultaneous read/write bursts.

Use Scenario: Coordinating position feedback and trajectory commands between servo drive microcontroller and motion FPGA in CNC equipment.

IC Role / Device Role / Timing Role: Acts as synchronized shared workspace; left port writes command data, right port reads status updates.

Use Value: On-chip semaphore registers eliminate software mutex overhead; industrial temperature rating ensures reliability in factory-floor thermal environments.

Automotive ADAS Sensor Fusion Hub

Medical Imaging Real-Time Frame Buffer

Use Scenario: Aggregating radar, camera, and LiDAR data streams in an autonomous driving ECU before fusion processing.

IC Role / Device Role / Timing Role: Dual-port RAM buffers raw sensor frames; one port receives DMA writes, the other serves CPU reads.

Use Value: Independent 2.5 V/3.3 V I/O per port matches mixed-voltage sensor interface standards; 12 ns industrial-grade timing meets ASIL-B timing constraints.

Use Scenario: Storing uncompressed ultrasound or MRI frame data during acquisition, where lossless real-time transfer is mandatory.

IC Role / Device Role / Timing Role: Serves as ping-pong frame buffer; left port captures incoming scan lines, right port feeds display engine.

Use Value: 256K × 18 capacity holds full HD frame (1920×1080×16-bit) with margin; asynchronous operation avoids clock domain crossing issues.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY7C1362BV18-167BZC	167 MHz synchronous interface; requires clock and control sequencing; no native BUSY arbitration	Best suited for clocked systems with predictable burst patterns; not drop-in for asynchronous legacy designs	Choose when migrating to synchronous architecture with FPGA or ASIC controller capable of managing clocked timing
AS7C3256B-15JCIN	Single-port CMOS SRAM; 256K × 16 organization; no dual-port, semaphore, or BUSY logic	Lacks hardware inter-processor coordination features; requires external arbitration logic for multi-CPU use	Select only for cost-sensitive single-processor applications where dual-port functionality is unnecessary

Compared with CY7C1362BV18-167BZC and AS7C3256B-15JCIN, the 70V631S15PRFI8 uniquely delivers asynchronous dual-port operation with integrated hardware arbitration and semaphore support - eliminating external logic and enabling deterministic real-time co-processing in legacy and new designs alike.

Availability

70V631S15PRFI8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and automotive ADAS applications requiring stable component supply, long-term lifecycle support, and industrial-grade temperature performance.

Supply support for 70V631S15PRFI8 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

IDT (Integrated Device Technology), now part of Renesas Electronics, is a semiconductor leader specializing in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V631S15PRFI8 belongs to IDT's high-speed asynchronous dual-port SRAM product line, engineered specifically for real-time embedded systems demanding deterministic latency, hardware-coordinated multi-processor access, and robust industrial operating conditions.

FAQ

What is the maximum access time specification for the 70V631S15PRFI8?

The 70V631S15PRFI8 has a maximum access time of 15 ns under commercial-grade conditions (0°C to +70°C) and is also qualified for industrial temperature range (–40°C to +85°C) with the same 15 ns timing spec. This value is guaranteed across voltage (VDD = 3.3 V ±150 mV) and temperature extremes, ensuring deterministic latency in real-time control applications.

How does the BUSY arbitration mechanism work in the 70V631S15PRFI8?

In the 70V631S15PRFI8, BUSY arbitration is hardware-implemented: when M/S = VIH (Master), BUSYX outputs a signal indicating port contention; when M/S = VIL (Slave), BUSYX becomes an input that blocks writes until deasserted. Timing parameters like tBAA (≤15 ns) and tBDD (≤15 ns) define response and resolution windows - no firmware intervention is needed.

Can the left and right ports of the 70V631S15PRFI8 operate at different I/O voltages?

Yes - the 70V631S15PRFI8 supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL = VIL configures the left port for 2.5 V I/O operation (requiring VDDQL = 2.5 V), while OPTR = VIH configures the right port for 3.3 V I/O (requiring VDDQR = 3.3 V). This enables direct interfacing with mixed-voltage subsystems without level shifters.

What package type does the 'PRFI8' suffix indicate for the 70V631S15PRFI8?

The 'PRFI8' suffix identifies the 70V631S15PRFI8 as the 128-pin Thin Quad Flatpack (TQFP) package variant, industrial temperature grade (–40°C to +85°C), lead-free (Pb-free), and RoHS-compliant. It corresponds to the PK-128 mechanical outline and is distinct from the BF208 (208-ball BGA) and BC256 (256-ball BGA) variants.

Does the 70V631S15PRFI8 support JTAG boundary-scan testing?

The 70V631S15PRFI8 supports IEEE 1149.1 JTAG boundary-scan functionality in its BGA packages (BF208 and BC256), but JTAG is explicitly omitted in the 128-pin TQFP (PRFI8) variant due to pin count limitations. Pins TDI, TDO, TCK, TMS, and TRST are present only in BGA versions - not on the PRFI8 package.

70V631S15PRFI8 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 128-LQFP

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Volatile

Memory Format:: SRAM

Technology:: SRAM - Dual Port, Asynchronous

Memory Size:: 4.5Mbit

Memory Organization:: 256K x 18

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 15ns

Access Time:: 15 ns

Voltage - Supply:: 3.15V ~ 3.45V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 128-TQFP (14x20)

70V631S15PRFI8 FAQ

1.How can I place an order for 70V631S15PRFI8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V631S15PRFI8 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 70V631S15PRFI8 reliable?

The price and inventory of 70V631S15PRFI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V631S15PRFI8 is usually 5 days.

3.What payment methods are accepted for 70V631S15PRFI8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V631S15PRFI8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70V631S15PRFI8?

70V631S15PRFI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V631S15PRFI8 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 70V631S15PRFI8?

For technical support, including 70V631S15PRFI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V631S15PRFI8 requirements.

6.How does Aetrix verify that 70V631S15PRFI8 is sourced from the original manufacturer or authorized distributors?

All 70V631S15PRFI8 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 70V631S15PRFI8 meets industry standards.

7.What is the process for return or replacement of 70V631S15PRFI8?

All 70V631S15PRFI8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V631S15PRFI8, 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 70V631S15PRFI8 part is unused and in its original packaging.

Return procedure for 70V631S15PRFI8:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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