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

Renesas 70V631S12BF

Name: 70V631S12BF
Brand: Renesas
SKU: 70V631S12BF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70V631S12BF

Manufacturer:: Renesas

Category:: Memory

Package:: 208-LFBGA

Datasheet:: 70V631S12BF.pdf

Description:: IC SRAM 4.5MBIT PAR 208CABGA

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Product details

Overview

70V631S12BF from Integrated Device Technology is a high-speed 256K × 18 asynchronous dual-port static RAM with fully independent left/right ports, 12 ns max access time (industrial grade), 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port-used in real-time inter-processor communication, FPGA co-processing buffers, and telecom line-card memory arbitration.

For engineers reviewing the 70V631S12BF datasheet, 70V631S12BF pinout, 70V631S12BF application, or 70V631S12BF equivalent, key selection criteria include BUSY-flag arbitration timing (tBDD ≤ 12 ns), dual-chip-enable depth expansion support, MASTER/SLAVE cascading for ≥36-bit word systems, and JTAG omission in TQFP packages.

Technical Context

The 70V631S12BF implements true dual-port SRAM cells enabling simultaneous read/write to the same address with hardware-enforced port arbitration via BUSY flag signaling. Its on-chip semaphore logic supports eight shared flags addressed by A0–A2, with dedicated SEM/INT pins per port.

It features separate byte controls (UBL/LBR, LBL/UBR) for independent 9-bit upper/lower byte access, and dual chip enables (CE0/CE1 per port) allowing seamless depth expansion without external logic. The M/S pin configures master (BUSY output) or slave (BUSY input) mode for cascaded operation.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	256K × 18 bits (4,608 Kbit total); supports 36-bit+ word systems via MASTER/SLAVE cascading
Access Time (max)	12 ns - guarantees deterministic latency for industrial real-time control loops
Core Supply	3.3 V ± 150 mV - fixed VDD; no voltage scaling for logic core
I/O Supply	Selectable 3.3 V or 2.5 V per port via OPTL/OPTR - enables mixed-voltage system interfacing
Operating Temperature	−40°C to +85°C - qualified for industrial embedded environments
Standby Current (ISB3)	≤15 mA (both ports in full CMOS standby) - low-power retention during idle cycles
Port Arbitration	Hardware BUSY flag with tBDD ≤ 12 ns - prevents data corruption during concurrent access

Pinout & Package

70V631S12BF is packaged in a 128-pin Thin Quad Flatpack (TQFP), body size ≈14 mm × 20 mm × 1.4 mm, with 0.5 mm lead pitch. JTAG is not supported in this package due to pin count limitation.

Pin/Terminal	Circuit Role	Design Meaning
A0L–A17L / A0R–A17R	Address Inputs (Left/Right)	18-bit independent addressing per port; enables simultaneous access to any location
I/O0L–I/O17L / I/O0R–I/O17R	Data I/O (Left/Right)	18-bit bidirectional data bus per port; supports byte-select via UBL/LBL and UBR/LBR
CE0L, CE1L / CE0R, CE1R	Chip Enables	Dual CE per port allows depth expansion without external decode logic
R/WL / R/WR	Read/Write Control	Active-low write enable; determines direction of data flow on respective port
OEL / OER	Output Enable	Controls tri-state of I/O drivers; required for read operations
BUSYL / BUSYR	Busy Flag	Master: output indicating port contention; Slave: input disabling writes during conflict
M/S	Master/Slave Select	VIH = Master (BUSYR output); VIL = Slave (BUSYR input); enables daisy-chained arbitration
SEML / SEMR	Semaphore Enable	Enables access to 8-bit semaphore register (A0–A2) for inter-port synchronization
INTL / INTR	Interrupt Flag	Open-drain interrupt output per port; set/cleared via dedicated address writes (3FFFE/3FFFF)
OPTL / OPTR	I/O Voltage Select	VIL = 2.5 V I/O; VIH = 3.3 V I/O - configures VDDQL/VDDQR supply domain independently

Key Features

Feature	Design Value
True Dual-Port Architecture	Simultaneous independent read/write to identical memory locations without external arbitration logic
Configurable I/O Voltage	Per-port 2.5 V or 3.3 V operation via OPT pins - eliminates level-shifters in mixed-voltage designs
Hardware Semaphore Support	On-chip 8-bit semaphore register with dedicated SEM pins - reduces software overhead in multi-core sync
Depth Expansion Ready	Dual CE enables (CE0/CE1) per port - allows stacking multiple devices without glue logic
Industrial Temp Range	−40°C to +85°C operation with 12 ns guaranteed access - suitable for base station and motor control

Applications

Telecom Line Card Buffering	FPGA-CPU Co-Processing Interface
Use Scenario: High-throughput packet buffering between line interface ASIC and control processor in 4G/LTE base stations. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-wait-state shared memory; left port connects to ASIC, right port to ARM-based controller. Use Value: 12 ns access ensures sub-microsecond inter-processor handshaking, eliminating FIFO bottlenecks in real-time traffic shaping.	Use Scenario: Real-time data exchange between Xilinx Zynq FPGA programmable logic and ARM Cortex-A9 processing system. IC Role / Device Role / Timing Role: Acts as low-latency scratchpad memory with hardware BUSY arbitration preventing race conditions during DMA transfers. Use Value: On-chip semaphore and interrupt flags reduce software polling overhead, enabling deterministic <1 µs context switching between PL and PS domains.
Industrial Motion Controller Shared Memory	Avionics Data Acquisition Buffer
Use Scenario: Synchronized sensor fusion and actuator command distribution in servo drive systems with dual MCU architecture. IC Role / Device Role / Timing Role: Provides atomic read-modify-write capability via semaphore flags; left port serves motion planner, right port serves safety monitor. Use Value: Hardware-enforced tBDD ≤ 12 ns arbitration ensures fail-safe coordination - critical for SIL-3 functional safety compliance.	Use Scenario: Buffered acquisition of analog-to-digital samples from multiple sensors in flight control computers. IC Role / Device Role / Timing Role: Dual-port RAM stores interleaved ADC streams; one port handles sampling, the other feeds DSP engine. Use Value: 256K × 18 capacity with 12 ns access supports sustained 20 MSPS throughput without DMA stalls or buffer underruns.

Telecom Line Card Buffering

FPGA-CPU Co-Processing Interface

Use Scenario: High-throughput packet buffering between line interface ASIC and control processor in 4G/LTE base stations.

IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-wait-state shared memory; left port connects to ASIC, right port to ARM-based controller.

Use Value: 12 ns access ensures sub-microsecond inter-processor handshaking, eliminating FIFO bottlenecks in real-time traffic shaping.

Use Scenario: Real-time data exchange between Xilinx Zynq FPGA programmable logic and ARM Cortex-A9 processing system.

IC Role / Device Role / Timing Role: Acts as low-latency scratchpad memory with hardware BUSY arbitration preventing race conditions during DMA transfers.

Use Value: On-chip semaphore and interrupt flags reduce software polling overhead, enabling deterministic <1 µs context switching between PL and PS domains.

Industrial Motion Controller Shared Memory

Avionics Data Acquisition Buffer

Use Scenario: Synchronized sensor fusion and actuator command distribution in servo drive systems with dual MCU architecture.

IC Role / Device Role / Timing Role: Provides atomic read-modify-write capability via semaphore flags; left port serves motion planner, right port serves safety monitor.

Use Value: Hardware-enforced tBDD ≤ 12 ns arbitration ensures fail-safe coordination - critical for SIL-3 functional safety compliance.

Use Scenario: Buffered acquisition of analog-to-digital samples from multiple sensors in flight control computers.

IC Role / Device Role / Timing Role: Dual-port RAM stores interleaved ADC streams; one port handles sampling, the other feeds DSP engine.

Use Value: 256K × 18 capacity with 12 ns access supports sustained 20 MSPS throughput without DMA stalls or buffer underruns.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY7C1362BV33-12BGXI	128K × 32 organization; 3.3 V only (no 2.5 V I/O option); 12 ns access; 208-ball BGA	Higher density per pin but narrower 32-bit bus; no per-port I/O voltage select	Choose when 32-bit native word width is required and board layout accommodates BGA
AS7C3256B-12JIN	256K × 16 organization; 3.3 V core/I/O; no BUSY arbitration or semaphore logic; 44-pin SOJ	Lacks hardware arbitration - requires external logic or software protocols for conflict resolution	Choose for cost-sensitive, non-concurrent-access applications where arbitration is handled at system level

Compared with CY7C1362BV33-12BGXI and AS7C3256B-12JIN, the 70V631S12BF uniquely delivers per-port 2.5 V/3.3 V I/O flexibility, integrated BUSY-flag arbitration, and MASTER/SLAVE cascading-making it optimal for heterogeneous, real-time inter-processor memory sharing where deterministic latency and voltage compatibility are mandatory.

Availability

70V631S12BF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and avionics applications requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature performance.

Supply support for 70V631S12BF 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, is a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs for communications and computing markets.

The 70V631S12BF belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems where hardware arbitration and voltage-flexible I/O are essential.

FAQ

What is the maximum guaranteed access time for the 70V631S12BF across its operating temperature range?

The 70V631S12BF guarantees a maximum access time of 12 ns over the full industrial temperature range (−40°C to +85°C), as specified in the 70V631S12 speed grade. This value applies to both read cycle time (tRC) and address access time (tAA), ensuring deterministic timing for hard real-time applications without derating.

Does the 70V631S12BF support JTAG boundary-scan testing?

No, the 70V631S12BF does not support JTAG boundary-scan testing. As explicitly stated in the datasheet, JTAG functionality compliant to IEEE 1149.1 is omitted in the 128-pin TQFP package due to insufficient pin count - the TQFP variant lacks dedicated TMS, TCK, TDI, TDO, and TRST pins required for JTAG implementation.

How does the M/S pin affect BUSY signal behavior in the 70V631S12BF?

When M/S = VIH, the 70V631S12BF operates as a Master: BUSYR functions as an output that asserts high during port contention to block writes on the opposing port. When M/S = VIL, it operates as a Slave: BUSYR becomes an input, and the device halts writes upon detecting a high BUSY signal from the Master - enabling hardware-synchronized cascading without external logic.

Can both ports of the 70V631S12BF operate at different I/O voltages simultaneously?

Yes, the 70V631S12BF supports independent I/O voltage selection per port: OPTL sets left-port I/O voltage (2.5 V or 3.3 V), and OPTR sets right-port I/O voltage. This allows the left port to interface with a 2.5 V FPGA while the right port connects to a 3.3 V microcontroller - eliminating external level shifters and simplifying mixed-voltage system design.

What is the function of the semaphore feature in the 70V631S12BF, and how is it accessed?

The 70V631S12BF includes an on-chip 8-bit semaphore register used for inter-port synchronization. It is accessed by asserting SEM = VIL and CE = VIH while applying addresses A2–A0 = 000 to 111 on either port. Reads return the semaphore value on all 18 I/O lines; writes use I/O0 only. This hardware mechanism replaces software-based locking, reducing latency and improving determinism in multi-core coordination.

70V631S12BF 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:: 12ns

Access Time:: 12 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)

70V631S12BF FAQ

1.How can I place an order for 70V631S12BF through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V631S12BF 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 70V631S12BF reliable?

The price and inventory of 70V631S12BF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V631S12BF is usually 5 days.

3.What payment methods are accepted for 70V631S12BF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V631S12BF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70V631S12BF?

70V631S12BF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V631S12BF 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 70V631S12BF?

For technical support, including 70V631S12BF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V631S12BF requirements.

6.How does Aetrix verify that 70V631S12BF is sourced from the original manufacturer or authorized distributors?

All 70V631S12BF 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 70V631S12BF meets industry standards.

7.What is the process for return or replacement of 70V631S12BF?

All 70V631S12BF units undergo pre-shipment inspection (PSI). If there is an issue with 70V631S12BF, 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 70V631S12BF part is unused and in its original packaging.

Return procedure for 70V631S12BF:

1.Submit a request within 90 days.

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

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