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

Renesas 70T651S12DRI

Name: 70T651S12DRI
Brand: Renesas
SKU: 70T651S12DRI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70T651S12DRI

Manufacturer:: Renesas

Category:: Memory

Package:: 208-BFQFP

Datasheet:: 70T651S12DRI.pdf

Description:: IC SRAM 9MBIT PARALLEL 208PQFP

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Product details

Overview

70T651S12DRI from IDT (now Renesas) is a high-speed 256K × 36-bit asynchronous dual-port static RAM with independent left/right ports, 12 ns max access time, 2.5 V core supply, and selectable 2.5 V/3.3 V I/O interface per port. It supports simultaneous read/write to the same memory location and is used in real-time inter-processor communication, FPGA co-processing buffers, and telecom packet buffering.

For engineers reviewing the 70T651S12DRI datasheet, 70T651S12DRI pinout, 70T651S12DRI application, or 70T651S12DRI equivalent, this device delivers deterministic low-latency dual-access memory for systems requiring concurrent data exchange between two independent buses - especially where semaphore-controlled resource arbitration and RapidWrite back-to-back write cycles are critical.

Technical Context

The 70T651S12DRI implements true dual-port SRAM cells with on-chip arbitration logic that resolves simultaneous access contention via BUSY flag signaling and hardware semaphore registers. Each port has fully independent control (CE0/CE1, R/W, OE, BE0–BE3), address (A0–A17), and 36-bit bidirectional I/O lines.

It supports Master/Slave cascading for 72+ bit data width expansion, JTAG IEEE 1149.1 boundary scan, and RapidWrite Mode - eliminating R/W pulse requirements between consecutive writes. Sleep mode (via ZZL/ZZR) reduces current to ≤10 mA while preserving JTAG accessibility.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	256K × 36 bits (9,216 Kbit total); enables 72-bit+ bus expansion via M/S cascading
Access Time (tAA)	12 ns max (industrial temp range −40°C to +85°C); guarantees deterministic latency for real-time systems
Core Supply	2.5 V ±100 mV (VDD); fixed low-voltage core enables power-efficient high-speed operation
I/O Interface	Selectable 2.5 V or 3.3 V per port (via OPTL/OPTR & VDDQL/VDDQR); supports mixed-voltage system integration
Power Consumption	ISB3 = 2–20 mA full standby (CMOS inputs); IZZ ≤10 mA sleep mode; reduces thermal load in dense PCB layouts
Arbitration Support	Hardware semaphore (8 flags, A0–A2 addressed), BUSY/INT flags, and automatic port arbitration logic
Package	208-pin PQFP (DR-208); 28 mm × 28 mm body; compatible with standard surface-mount reflow profiles

Pinout & Package

70T651S12DRI is housed in a 208-pin Plastic Quad Flat Pack (PQFP), DR-208 package (28 mm × 28 mm × 3.5 mm). All VDD pins require 2.5 V; VDDQL/VDDQR must match OPTL/OPTR configuration (2.5 V if OPT = VSS, 3.3 V if OPT = VDD).

Pin/Terminal	Circuit Role	Design Meaning
CE0L / CE1L CE0R / CE1R	Chip Enable (dual per port)	Asynchronous port activation; CE0=VIL & CE1=VIH enables port; allows depth expansion without external logic
R/WL / R/WR	Read/Write Control	Active-low write enable; supports RapidWrite Mode when held low across address transitions
OEL / OER	Output Enable	Controls tri-state output drivers; required for bus sharing; tAOE ≤6 ns ensures fast data release
BE0L–BE3L / BE0R–BE3R	Byte Enables (9-bit)	Independent 9-bit write masking per port; enables partial writes without read-modify-write overhead
BUSYL / BUSYR	Busy Flag	Push-pull output (non-tri-state); indicates port contention; M/S=VIH → output (Master), M/S=VIL → input (Slave)
SEML / SEMR	Semaphore Enable	Activates hardware semaphore register access (I/O0–I/O35); enables inter-processor synchronization without software polling
INTL / INTR	Interrupt Flag	Push-pull output; asserts on semaphore flag change or arbitration event; eliminates polling latency
ZZL / ZZR	Sleep Mode Input	Asserted high disables dynamic inputs (except JTAG); reduces ICC to ≤10 mA; preserves state during idle periods

Key Features

Feature	Design Value
True Dual-Port Architecture	Simultaneous independent read/write to identical addresses on left/right ports - no internal arbitration delay
RapidWrite Mode	Eliminates R/W pulsing between consecutive writes; simplifies timing-critical control logic and improves sustained write throughput
Configurable I/O Voltage	Per-port 2.5 V/3.3 V selection via OPT pins and dedicated VDDQ supplies - enables seamless interfacing with mixed-voltage SoCs/FPGAs
Hardware Semaphore Logic	On-chip 8-flag semaphore register accessible via A0–A2; reduces inter-processor sync overhead and eliminates external lock controllers
Master/Slave Cascading	Supports >72-bit word width using M/S select; maintains full-speed operation without external glue logic or timing penalties
JTAG Boundary Scan	Fully compliant IEEE 1149.1 (TCK, TMS, TDI, TDO, TRST); enables in-system testability and debug visibility without board-level probes

Applications

Telecom Packet Buffering	FPGA Co-Processing Memory
Use Scenario: Storing and forwarding variable-length Ethernet/SONET packets between line-card processors and switching fabric. IC Role / Device Role / Timing Role: Dual-port SRAM acting as zero-latency shared buffer - left port handles ingress traffic, right port serves egress scheduler. Use Value: 12 ns access time and BUSY flag coordination prevent packet loss during concurrent read/write bursts at OC-192 line rates.	Use Scenario: Providing low-latency, deterministic memory for FPGA-based digital signal processing pipelines (e.g., radar beamforming, video encoding). IC Role / Device Role / Timing Role: Off-chip memory extension synchronized to FPGA clock domains - one port driven by logic fabric, other by hard IP DMA engine. Use Value: RapidWrite Mode enables back-to-back coefficient updates without pipeline stalls; 36-bit width matches common DSP word sizes.
Real-Time Inter-Processor Communication	Industrial PLC Data Exchange
Use Scenario: Shared memory region between dual-core ARM processors executing safety-critical control and diagnostics tasks. IC Role / Device Role / Timing Role: Hardware-synchronized mailbox - semaphore flags coordinate task handoff; BUSY signals prevent race conditions. Use Value: On-chip semaphore logic eliminates software mutex overhead; industrial temperature rating (−40°C to +85°C) ensures reliability in harsh environments.	Use Scenario: Exchanging I/O status, motion control parameters, and alarm logs between PLC CPU and motion controller ASIC. IC Role / Device Role / Timing Role: Deterministic dual-access memory bridging disparate real-time networks (e.g., EtherCAT master ↔ servo drive interface). Use Value: Independent byte enables (BE0–BE3) allow atomic updates of individual axis parameters without corrupting adjacent control words.

Telecom Packet Buffering

FPGA Co-Processing Memory

Use Scenario: Storing and forwarding variable-length Ethernet/SONET packets between line-card processors and switching fabric.

IC Role / Device Role / Timing Role: Dual-port SRAM acting as zero-latency shared buffer - left port handles ingress traffic, right port serves egress scheduler.

Use Value: 12 ns access time and BUSY flag coordination prevent packet loss during concurrent read/write bursts at OC-192 line rates.

Use Scenario: Providing low-latency, deterministic memory for FPGA-based digital signal processing pipelines (e.g., radar beamforming, video encoding).

IC Role / Device Role / Timing Role: Off-chip memory extension synchronized to FPGA clock domains - one port driven by logic fabric, other by hard IP DMA engine.

Use Value: RapidWrite Mode enables back-to-back coefficient updates without pipeline stalls; 36-bit width matches common DSP word sizes.

Real-Time Inter-Processor Communication

Industrial PLC Data Exchange

Use Scenario: Shared memory region between dual-core ARM processors executing safety-critical control and diagnostics tasks.

IC Role / Device Role / Timing Role: Hardware-synchronized mailbox - semaphore flags coordinate task handoff; BUSY signals prevent race conditions.

Use Value: On-chip semaphore logic eliminates software mutex overhead; industrial temperature rating (−40°C to +85°C) ensures reliability in harsh environments.

Use Scenario: Exchanging I/O status, motion control parameters, and alarm logs between PLC CPU and motion controller ASIC.

IC Role / Device Role / Timing Role: Deterministic dual-access memory bridging disparate real-time networks (e.g., EtherCAT master ↔ servo drive interface).

Use Value: Independent byte enables (BE0–BE3) allow atomic updates of individual axis parameters without corrupting adjacent control words.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Cypress CY7C1362BV33	256K × 36, 10 ns commercial speed, 3.3 V core + I/O, no sleep mode, no JTAG	Lacks hardware semaphore, BUSY arbitration, and RapidWrite; requires external logic for M/S expansion	Choose when only basic dual-port functionality is needed and 3.3 V-only system integration simplifies BOM.
Renesas 70V25S25PF8	128K × 36, 25 ns access, 3.3 V core/I/O, integrated PLL, no OPT-selectable I/O voltage	Slower access, fixed 3.3 V interface, no per-port voltage flexibility; includes clock synthesis but no semaphore logic	Prefer when system clock domain alignment is critical and lower density suffices - not suitable for 256K×36 or mixed-voltage designs.

Compared with CY7C1362BV33 and 70V25S25PF8, the 70T651S12DRI uniquely combines industrial-grade 12 ns timing, per-port I/O voltage selection, hardware semaphore, and RapidWrite - making it the only option supporting deterministic real-time inter-processor communication in mixed-voltage embedded systems.

Availability

70T651S12DRI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and FPGA-accelerated edge computing systems requiring stable component supply, long lifecycle support, and guaranteed industrial temperature performance.

Supply support for 70T651S12DRI 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 IDT) is a global semiconductor leader specializing in embedded processing, analog, power, and connectivity solutions for automotive, industrial, and communications markets.

The 70T651S12DRI belongs to IDT's high-performance asynchronous dual-port SRAM product line, engineered specifically for deterministic real-time data exchange between heterogeneous processors, FPGAs, and ASICs in mission-critical infrastructure.

FAQ

What is the maximum operating temperature range for the 70T651S12DRI?

The 70T651S12DRI is rated for industrial temperature operation from −40°C to +85°C. This specification is validated across all electrical parameters including 12 ns access time (tAA), standby current (ISB1–ISB4), and I/O voltage tolerances - ensuring reliable performance in base stations, motor drives, and outdoor networking equipment.

Does the 70T651S12DRI support both 2.5 V and 3.3 V I/O interfaces simultaneously?

Yes - the 70T651S12DRI supports independent I/O voltage selection per port: OPTL sets left-port I/O levels (2.5 V or 3.3 V), and OPTR sets right-port levels. Corresponding VDDQL and VDDQR supplies must be configured accordingly. This enables direct interfacing with 2.5 V FPGAs and 3.3 V microcontrollers on the same device.

How does RapidWrite Mode function in the 70T651S12DRI?

RapidWrite Mode in the 70T651S12DRI allows consecutive write operations without toggling R/W, CE, or BE signals between cycles. The write cycle end is defined by the *next* address transition, not R/W deassertion. This eliminates narrow pulse generation challenges and sustains full 12 ns write throughput - confirmed in AC Table 13 (tWC = 12 ns).

What is the role of the BUSY flag in the 70T651S12DRI, and how is it configured?

The BUSY flag (BUSYL/BUSYR) is a push-pull output indicating port contention during simultaneous access. Its direction is controlled by the M/S pin: when M/S = VIH, the port acts as Master and BUSY is an output; when M/S = VIL, it acts as Slave and BUSY is an input. This enables hardware-managed arbitration without software intervention.

Can the 70T651S12DRI be used in JTAG-boundary-scan testing?

Yes - the 70T651S12DRI fully complies with IEEE 1149.1 and includes dedicated TCK, TMS, TDI, TDO, and TRST pins. JTAG remains functional even during ZZL/ZZR sleep mode activation, enabling in-system testability and debug access without powering up the full memory array.

70T651S12DRI Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 208-BFQFP

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:: 12ns

Access Time:: 12 ns

Voltage - Supply:: 2.4V ~ 2.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 208-PQFP (28x28)

70T651S12DRI FAQ

1.How can I place an order for 70T651S12DRI through Aetrix?

Please submit a Request for Quotation (RFQ) for 70T651S12DRI 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 70T651S12DRI reliable?

The price and inventory of 70T651S12DRI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70T651S12DRI is usually 5 days.

3.What payment methods are accepted for 70T651S12DRI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70T651S12DRI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70T651S12DRI?

70T651S12DRI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70T651S12DRI 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 70T651S12DRI?

For technical support, including 70T651S12DRI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70T651S12DRI requirements.

6.How does Aetrix verify that 70T651S12DRI is sourced from the original manufacturer or authorized distributors?

All 70T651S12DRI 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 70T651S12DRI meets industry standards.

7.What is the process for return or replacement of 70T651S12DRI?

All 70T651S12DRI units undergo pre-shipment inspection (PSI). If there is an issue with 70T651S12DRI, 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 70T651S12DRI part is unused and in its original packaging.

Return procedure for 70T651S12DRI:

1.Submit a request within 90 days.

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

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