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

Renesas 70T651S15BC

Name: 70T651S15BC
Brand: Renesas
SKU: 70T651S15BC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70T651S15BC

Manufacturer:: Renesas

Category:: Memory

Package:: 256-LBGA

Datasheet:: 70T651S15BC.pdf

Description:: IC SRAM 9MBIT PARALLEL 256CABGA

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Product details

Overview

70T651S15BC from Integrated Device Technology is a high-speed 256K x 36 asynchronous dual-port static RAM with independent left/right ports, 15 ns max read cycle time, 2.5 V core supply, and selectable 2.5 V/3.3 V I/O interface per port - used in real-time inter-processor communication, FPGA co-processor buffering, and telecom line card memory arbitration.

For engineers reviewing the 70T651S15BC datasheet, 70T651S15BC pinout, 70T651S15BC application, or 70T651S15BC equivalent, key selection criteria include dual-port arbitration logic, RapidWrite mode timing, M/S master/slave cascading capability, and industrial-grade (-40°C to +85°C) BC-256 BGA packaging.

Technical Context

The 70T651S15BC implements true dual-port SRAM cells enabling simultaneous read/write access to the same memory location without contention. Its on-chip arbitration logic resolves port conflicts via semaphore signaling and BUSY flag handshaking between master and slave configurations.

It supports fully asynchronous operation per port, with separate CE0/CE1, R/W, OE, and BE0–BE3 controls for each side, plus JTAG IEEE 1149.1 compliance for boundary scan. Sleep mode (ZZL/ZZR) reduces standby current to ≤10 mA while preserving JTAG accessibility.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	256K x 36 bits (9,216 Kbit total); supports 72-bit+ expansion via Master/Slave cascading
Access Time (tAA)	15 ns max (commercial grade); defines minimum address-to-data valid delay under full load
Read Cycle Time (tRC)	15 ns max; sets minimum interval between successive read operations on same port
Core Supply Voltage	2.5 V ±100 mV; powers internal logic; requires all VDD pins tied to 2.5 V
I/O Interface Voltage	Selectable 2.5 V or 3.3 V per port via OPTL/OPTR; VDDQL/VDDQR must match selected level
Operating Temperature	0°C to +70°C (commercial); validated for stable operation across full ambient range
Package	BC-256: 256-ball fine-pitch BGA, 17 mm × 17 mm × 1.4 mm, 1.0 mm ball pitch

Pinout & Package

70T651S15BC is housed in a 256-ball fine-pitch BGA (BC-256) package with 1.0 mm ball pitch, 17 mm × 17 mm body size, and thermal pad-compatible layout. Power and ground balls are distributed across the array for low-impedance delivery.

Pin/Terminal	Circuit Role	Design Meaning
A0L–A17L / A0R–A17R	Address Inputs (Left/Right)	18-bit address bus per port; A17L/A17R are NC for 128K variants but functional for 256K configuration
I/O0L–I/O35L / I/O0R–I/O35R	Bidirectional Data Bus (36-bit)	Independent 36-bit data paths; byte enables (BE0–BE3) allow 9-bit granularity writes per port
CE0L/CE1L, CE0R/CE1R	Chip Enable Pairs	Dual CE per port enables depth expansion without external logic; CE0=VIL & CE1=VIH activates port
R/WL/R/WR, OEL/OER	Control Inputs	Asynchronous read/write control; OE disables outputs to high-Z; R/W direction determines I/O state
SEML/SEMR, BUSYL/BUSYR	Arbitration Signals	Semaphore enable and busy flags coordinate inter-port access; BUSY is output (Master) or input (Slave) per M/S setting
OPTL/OPTR, VDDQL/VDDQR	I/O Voltage Select	OPT = VSS → 2.5 V I/O; OPT = VDD → 3.3 V I/O; VDDQX must match selected voltage
ZZL/ZZR	Sleep Mode Inputs	Asserting ZZx = VIH disables dynamic inputs (except JTAG), reducing ISB to ≤10 mA
TCK/TMS/TDI/TDO/TRST	JTAG Boundary Scan	Fully compliant with IEEE 1149.1; operates independently during sleep mode

Key Features

Feature	Design Value
True Dual-Port Architecture	Enables concurrent, collision-free access to identical memory locations from two independent buses
RapidWrite Mode	Eliminates need to toggle R/W between back-to-back writes; address transition defines write end, easing high-speed timing closure
On-Chip Semaphore Logic	Hardware-managed flag exchange via I/O0–I/O35 using A0–A2 addressing; no external arbitration logic required
Configurable I/O Voltage	Independent 2.5 V/3.3 V interface per port via OPT pins - supports mixed-voltage system integration
Master/Slave Cascading	M/S pin configures BUSY as output (Master) or input (Slave); enables seamless 72-bit+ word-width expansion

Applications

Telecom Line Card Buffering	FPGA-CPU Co-Processor Memory
Use Scenario: High-throughput packet buffering between DSP and network processor in 10G line cards. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency shared memory with deterministic read/write arbitration. Use Value: 15 ns tAA ensures sub-16 ns data availability for 62.5 MHz packet processing clocks.	Use Scenario: Real-time data exchange between Xilinx FPGA fabric and ARM-based host controller in industrial vision systems. IC Role / Device Role / Timing Role: Left port interfaces FPGA AXI-lite, right port connects to CPU parallel bus; M/S enables priority handshaking. Use Value: RapidWrite mode sustains >66 MHz sustained write throughput without R/W retriggering overhead.
Real-Time Inter-Processor Communication	Avionics Data Acquisition Buffer
Use Scenario: Synchronized sensor fusion between dual-core safety-critical processors in flight control units. IC Role / Device Role / Timing Role: Acts as lock-free shared memory with hardware semaphore support for atomic flag updates. Use Value: SEM/INT signals provide sub-5 ns flag update (tSOP) and contention window (tSPS), meeting DO-254 timing budgets.	Use Scenario: Buffered acquisition of multi-channel analog sensor data sampled at 1 MSPS in airborne telemetry modules. IC Role / Device Role / Timing Role: Right port captures ADC stream via burst writes; left port services query reads from flight management computer. Use Value: 256K depth provides 7.2 MB buffer space for 200 ms pre-trigger capture at 36-bit resolution.

Telecom Line Card Buffering

FPGA-CPU Co-Processor Memory

Use Scenario: High-throughput packet buffering between DSP and network processor in 10G line cards.

IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency shared memory with deterministic read/write arbitration.

Use Value: 15 ns tAA ensures sub-16 ns data availability for 62.5 MHz packet processing clocks.

Use Scenario: Real-time data exchange between Xilinx FPGA fabric and ARM-based host controller in industrial vision systems.

IC Role / Device Role / Timing Role: Left port interfaces FPGA AXI-lite, right port connects to CPU parallel bus; M/S enables priority handshaking.

Use Value: RapidWrite mode sustains >66 MHz sustained write throughput without R/W retriggering overhead.

Real-Time Inter-Processor Communication

Avionics Data Acquisition Buffer

Use Scenario: Synchronized sensor fusion between dual-core safety-critical processors in flight control units.

IC Role / Device Role / Timing Role: Acts as lock-free shared memory with hardware semaphore support for atomic flag updates.

Use Value: SEM/INT signals provide sub-5 ns flag update (tSOP) and contention window (tSPS), meeting DO-254 timing budgets.

Use Scenario: Buffered acquisition of multi-channel analog sensor data sampled at 1 MSPS in airborne telemetry modules.

IC Role / Device Role / Timing Role: Right port captures ADC stream via burst writes; left port services query reads from flight management computer.

Use Value: 256K depth provides 7.2 MB buffer space for 200 ms pre-trigger capture at 36-bit resolution.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY7C1362BV33-15ZXI	3.3 V core; 15 ns access; 128K x 36; TQFP-100 package; no RapidWrite mode	Lacks on-chip semaphore logic and M/S cascading; requires external arbitration for multi-master use	Preferred where board space permits TQFP and system-level arbitration is already implemented
AS7C3256A-15JCIN	Single-port CMOS SRAM; 256K x 32; SOJ-44; 15 ns; 3.3 V only	No dual-port capability; no arbitration or BUSY/SEM signals; not suitable for concurrent access scenarios	Only viable if application can be rearchitected for time-multiplexed access and external handshake logic

Compared with CY7C1362BV33-15ZXI and AS7C3256A-15JCIN, the 70T651S15BC uniquely delivers hardware-accelerated inter-port coordination, voltage-flexible I/O per port, and RapidWrite timing - making it irreplaceable for tightly coupled dual-processor systems requiring deterministic latency and zero-software arbitration overhead.

Availability

70T651S15BC is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and avionics applications requiring stable component supply, long-lifecycle support, and guaranteed commercial-grade performance.

Supply support for 70T651S15BC 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT70T651 family targets deterministic, low-latency inter-processor memory sharing - specifically engineered for systems demanding simultaneous, conflict-free access to shared data without software intervention.

FAQ

What is the maximum operating temperature range supported by the 70T651S15BC?

The 70T651S15BC is rated for commercial temperature operation from 0°C to +70°C. It is not qualified for industrial temperature range (–40°C to +85°C); that grade is designated as 70T651S12BC or 70T651S10BC per speed bin and package.

Does the 70T651S15BC support both 2.5 V and 3.3 V I/O interfaces simultaneously?

Yes - the 70T651S15BC supports independent I/O voltage selection per port: OPTL configures the left port's VDDQL (2.5 V or 3.3 V), and OPTR configures the right port's VDDQR. Both ports may operate at the same or different voltages, provided VDDQX matches the OPT setting.

How does RapidWrite mode function in the 70T651S15BC, and what timing parameters change?

In RapidWrite mode, the 70T651S15BC uses address transitions-not R/W deassertion-to define write cycle boundaries. This eliminates R/W toggling between writes. tAS and tWR become irrelevant during consecutive writes; tDW and tDH are referenced to the ending address transition instead of R/W edge.

Can the 70T651S15BC be used in a Master/Slave configuration, and how is BUSY behavior controlled?

Yes - the M/S pin configures BUSY behavior: when M/S = VIH, BUSYL/BUSYR act as output flags indicating local port contention; when M/S = VIL, they serve as input signals from the remote port. This enables hardware-coordinated arbitration without external logic in cascaded systems.

What package type and ball count does the 70T651S15BC use, and are thermal pads supported?

The 70T651S15BC uses the BC-256 package: a 256-ball fine-pitch BGA with 1.0 mm pitch, 17 mm × 17 mm footprint, and 1.4 mm height. The package includes dedicated VSS and VDD balls distributed for low-inductance power delivery, and supports standard PCB thermal pad design for enhanced heat dissipation.

70T651S15BC Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 256-LBGA

Packaging:: Tray

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Volatile

Memory Format:: SRAM

Technology:: SRAM - Dual Port, Asynchronous

Memory Size:: 9Mbit

Memory Organization:: 256K x 36

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 15ns

Access Time:: 15 ns

Voltage - Supply:: 2.4V ~ 2.6V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 256-CABGA (17x17)

70T651S15BC FAQ

1.How can I place an order for 70T651S15BC through Aetrix?

Please submit a Request for Quotation (RFQ) for 70T651S15BC 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 70T651S15BC reliable?

The price and inventory of 70T651S15BC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70T651S15BC is usually 5 days.

3.What payment methods are accepted for 70T651S15BC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70T651S15BC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70T651S15BC?

70T651S15BC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70T651S15BC 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 70T651S15BC?

For technical support, including 70T651S15BC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70T651S15BC requirements.

6.How does Aetrix verify that 70T651S15BC is sourced from the original manufacturer or authorized distributors?

All 70T651S15BC 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 70T651S15BC meets industry standards.

7.What is the process for return or replacement of 70T651S15BC?

All 70T651S15BC units undergo pre-shipment inspection (PSI). If there is an issue with 70T651S15BC, 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 70T651S15BC part is unused and in its original packaging.

Return procedure for 70T651S15BC:

1.Submit a request within 90 days.

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

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