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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Renesas 70V631S15BF

Name: 70V631S15BF
Brand: Renesas
SKU: 70V631S15BF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70V631S15BF

Manufacturer:: Renesas

Category:: Memory

Package:: 208-LFBGA

Datasheet:: 70V631S15BF.pdf

Description:: IC SRAM 4.5MBIT PAR 208CABGA

Quantity:: RFQ Add To RFQ list

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Product details

Overview

70V631S15BF from IDT (Integrated Device Technology) is a high-speed, fully asynchronous 256K × 18-bit dual-port static RAM with independent left/right ports, 15 ns max access time, 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port-designed for real-time inter-processor communication in telecom line cards and industrial motion controllers.

For engineers reviewing the 70V631S15BF datasheet, 70V631S15BF pinout, 70V631S15BF application, or 70V631S15BF equivalent, this page delivers verified timing specs, Master/Slave arbitration behavior, BUSY flag timing under address contention, and confirmed 208-ball BGA (BF208) package mapping-enabling accurate memory subsystem co-design without layout rework.

Technical Context

The 70V631S15BF implements true dual-port SRAM cells with on-chip arbitration logic that resolves simultaneous access to identical addresses via hardware-controlled BUSY assertion. Its port-to-port delay (tWDD ≤ 30 ns, tDDD ≤ 25 ns) ensures deterministic data visibility across ports without external synchronization.

It supports independent I/O voltage selection per port (3.3 V or 2.5 V) via OPTL/OPTR pins, enabling mixed-voltage system interfacing. JTAG is omitted in the BF208 package due to pin count constraints, but full semaphore and interrupt flag support remains active for inter-core signaling.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	256K × 18 bits (4,608 Kbit total); enables 36-bit+ word systems via Master/Slave cascading
Max Access Time	15 ns (commercial grade); guarantees worst-case read latency for real-time control loops
Core Supply	3.3 V ±150 mV (VDD); fixed core voltage decouples performance from I/O rail variations
I/O Supply Options	Selectable 3.3 V or 2.5 V per port (via OPTL/OPTR); allows direct interface to 2.5 V FPGAs or 3.3 V microcontrollers
Operating Temperature	0°C to +70°C (commercial); validated for stable operation in uncooled telecom chassis environments
Package	208-ball fine-pitch BGA (BF208); 15 mm × 15 mm body, 0.8 mm ball pitch, RoHS-compliant
Arbitration Logic	Hardware-based BUSY flag with tBAA ≤ 15 ns; eliminates need for software polling or external semaphores

Pinout & Package

70V631S15BF is packaged in a 208-ball fine-pitch BGA (package code BF208), with 15 mm × 15 mm footprint and 0.8 mm ball pitch. All VDD pins require 3.3 V; VDDQL/VDDQR must match OPTL/OPTR logic level (3.3 V if VIH, 2.5 V if VIL).

Pin/Terminal	Circuit Role	Design Meaning
A0L–A17L / A0R–A17R	Address Inputs (Left/Right)	18-bit independent address buses; enable concurrent access to any memory location from either port
I/O0L–I/O17L / I/O0R–I/O17R	Data I/O (Left/Right)	18-bit bidirectional data paths; byte-selectable (UBL/LBL, UBR/LBR) for partial-word transfers
CE0L/CE1L, CE0R/CE1R	Chip Enables	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 port's I/O bus
BUSYL / BUSYR	Busy Flag (Input/Output)	When M/S = VIH (Master), BUSYR outputs contention signal; when M/S = VIL (Slave), BUSYL inputs BUSY to stall writes
OPTL / OPTR	I/O Voltage Select	Set to VIH (3.3 V) or VIL (0 V) to configure corresponding port's VDDQX and interface voltage level
M/S	Master/Slave Select	Configures device role in cascaded systems: VIH enables BUSY output (Master); VIL enables BUSY input (Slave)

Key Features

Feature	Design Value
True Dual-Port Architecture	Simultaneous independent read/write to same memory location with hardware arbitration-no external logic required
Configurable I/O Voltage Per Port	OPTL/OPTR pins select 3.3 V or 2.5 V I/O levels independently-enables seamless integration with mixed-voltage SoCs and FPGAs
On-Chip Semaphore Support	Eight dedicated flags accessible via A0–A2; enables atomic resource locking between processors without software overhead
Full Hardware Interrupt Flags	INTL/INTR set/reset via specific address writes (e.g., 3FFFEH/3FFFFH); provides event-driven inter-processor notification
Depth Expansion Capability	Dual chip enables and M/S pin allow stacking multiple 70V631S15BFs to build 36-bit+ wide memory without glue logic

Applications

Telecom Line Card Buffering	Industrial Motion Controller Shared Memory
Use Scenario: High-throughput packet buffering between line interface ASIC and traffic management processor in OC-192 SONET cards. IC Role / Device Role / Timing Role: Asynchronous dual-port SRAM providing zero-wait-state data exchange with deterministic 15 ns access and hardware BUSY arbitration. Use Value: Eliminates FIFO bottlenecks and reduces jitter by enabling concurrent read/write at full line rate without CPU intervention.	Use Scenario: Real-time coordination of servo axis positions and trajectory updates between motion controller FPGA and safety PLC. IC Role / Device Role / Timing Role: Shared memory with semaphore and interrupt flags enabling lock-free, low-latency state synchronization. Use Value: Reduces inter-processor handshake latency to <15 ns, meeting IEC 61800-5-2 functional safety timing constraints.
Automated Test Equipment (ATE) Pattern Memory	Avionics Data Acquisition Buffer
Use Scenario: Storing high-speed digital stimulus patterns for parallel channel testing of mixed-signal ICs. IC Role / Device Role / Timing Role: Dual-port RAM serving as pattern generator memory (left port) and result capture buffer (right port) with independent timing. Use Value: Enables simultaneous pattern streaming and result logging at 66 MHz effective clock rate without cycle stealing.	Use Scenario: Capturing synchronized sensor data from inertial measurement units (IMUs) and GPS receivers in flight control computers. IC Role / Device Role / Timing Role: Asynchronous buffer accepting time-stamped samples from two independent ADC interfaces via separate ports. Use Value: Guarantees atomic sample capture with tWDD ≤ 30 ns port-to-port propagation-critical for Kalman filter convergence.

Telecom Line Card Buffering

Industrial Motion Controller Shared Memory

Use Scenario: High-throughput packet buffering between line interface ASIC and traffic management processor in OC-192 SONET cards.

IC Role / Device Role / Timing Role: Asynchronous dual-port SRAM providing zero-wait-state data exchange with deterministic 15 ns access and hardware BUSY arbitration.

Use Value: Eliminates FIFO bottlenecks and reduces jitter by enabling concurrent read/write at full line rate without CPU intervention.

Use Scenario: Real-time coordination of servo axis positions and trajectory updates between motion controller FPGA and safety PLC.

IC Role / Device Role / Timing Role: Shared memory with semaphore and interrupt flags enabling lock-free, low-latency state synchronization.

Use Value: Reduces inter-processor handshake latency to <15 ns, meeting IEC 61800-5-2 functional safety timing constraints.

Automated Test Equipment (ATE) Pattern Memory

Avionics Data Acquisition Buffer

Use Scenario: Storing high-speed digital stimulus patterns for parallel channel testing of mixed-signal ICs.

IC Role / Device Role / Timing Role: Dual-port RAM serving as pattern generator memory (left port) and result capture buffer (right port) with independent timing.

Use Value: Enables simultaneous pattern streaming and result logging at 66 MHz effective clock rate without cycle stealing.

Use Scenario: Capturing synchronized sensor data from inertial measurement units (IMUs) and GPS receivers in flight control computers.

IC Role / Device Role / Timing Role: Asynchronous buffer accepting time-stamped samples from two independent ADC interfaces via separate ports.

Use Value: Guarantees atomic sample capture with tWDD ≤ 30 ns port-to-port propagation-critical for Kalman filter convergence.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY7C1362BV33-15BGXI	256K × 18, 15 ns, 3.3 V core/I/O; no OPT pin-fixed 3.3 V I/O only; includes JTAG in 208-BGA	Requires matching 3.3 V I/O on both sides; lacks per-port voltage flexibility of 70V631S15BF	Choose when JTAG debug capability is mandatory and system uses uniform 3.3 V logic levels.
AS7C3256B-15TIN	256K × 16, 15 ns, 3.3 V core/I/O; synchronous interface (clocked), not asynchronous; 44-pin TSOPII package	Requires clock domain synchronization; narrower 16-bit bus; incompatible pinout and timing model	Choose only for cost-sensitive, space-constrained designs where synchronous timing and reduced width are acceptable.

Compared with CY7C1362BV33-15BGXI and AS7C3256B-15TIN, the 70V631S15BF uniquely supports per-port I/O voltage selection and true asynchronous operation-making it optimal for heterogeneous processor interconnects where voltage translation and timing independence are critical.

Availability

70V631S15BF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, automated test equipment, and avionics data acquisition requiring stable component supply across extended production lifecycles.

Supply support for 70V631S15BF 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

Integrated Device Technology (IDT), now part of Renesas Electronics, specializes in high-performance timing, memory interface, and RF power solutions for communications and computing markets.

The 70V631S15BF belongs to IDT's high-speed asynchronous dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor communication in real-time embedded systems.

FAQ

What is the maximum operating temperature range for the 70V631S15BF?

The 70V631S15BF is specified for commercial-grade operation from 0°C to +70°C. It is not rated for industrial temperature (–40°C to +85°C); that range applies only to the 70V631S12 variant. Thermal derating beyond +70°C is not supported, and junction temperature must remain within absolute maximum limits per datasheet Table 5.

Does the 70V631S15BF support JTAG boundary scan?

No, the 70V631S15BF does not support JTAG boundary scan. Although IEEE 1149.1 features are implemented in the 70V631 family, JTAG is explicitly disabled in the BF208 (208-ball BGA) package due to insufficient pin count-as confirmed in the datasheet footnote on page 1. Pins TDI, TDO, TCK, TMS, and TRST are present but non-functional in this variant.

How does the BUSY arbitration work when both ports access the same address simultaneously on the 70V631S15BF?

When both ports attempt simultaneous access to the same address, the 70V631S15BF asserts BUSY on the later-arriving port within ≤15 ns (tBAA). If configured as Master (M/S = VIH), it drives BUSY output; if Slave (M/S = VIL), it samples BUSY input to stall its write. This hardware arbitration eliminates race conditions without software intervention or external logic.

Can the left and right ports of the 70V631S15BF operate at different I/O voltages?

Yes-the 70V631S15BF supports independent I/O voltage selection per port. OPTL sets left-port I/O voltage (3.3 V if VIH, 2.5 V if VIL); OPTR sets right-port I/O voltage identically. Corresponding VDDQL and VDDQR supplies must match these selections. This enables direct interfacing with mixed-voltage FPGAs and microcontrollers without level shifters.

What is the minimum pulse width required for reliable write operations on the 70V631S15BF?

The minimum write pulse width (tWP) for the 70V631S15BF is 12 ns, as specified in Table 13 for the 15 ns speed grade. This must be met regardless of whether the write is controlled by R/W or CE. If OE is active during the write, the pulse must also satisfy tWZ + tDW ≥ tWP to ensure proper I/O driver disable timing before data validity.

70V631S15BF Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 208-LFBGA

Packaging:: Tray

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:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 208-CABGA (15x15)

70V631S15BF FAQ

1.How can I place an order for 70V631S15BF through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V631S15BF 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 70V631S15BF reliable?

The price and inventory of 70V631S15BF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V631S15BF is usually 5 days.

3.What payment methods are accepted for 70V631S15BF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V631S15BF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70V631S15BF?

70V631S15BF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V631S15BF 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 70V631S15BF?

For technical support, including 70V631S15BF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V631S15BF requirements.

6.How does Aetrix verify that 70V631S15BF is sourced from the original manufacturer or authorized distributors?

All 70V631S15BF 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 70V631S15BF meets industry standards.

7.What is the process for return or replacement of 70V631S15BF?

All 70V631S15BF units undergo pre-shipment inspection (PSI). If there is an issue with 70V631S15BF, 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 70V631S15BF part is unused and in its original packaging.

Return procedure for 70V631S15BF:

1.Submit a request within 90 days.

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

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