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

Renesas 70V657S15DR

Name: 70V657S15DR
Brand: Renesas
SKU: 70V657S15DR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70V657S15DR

Manufacturer:: Renesas

Category:: Memory

Package:: 208-BFQFP

Datasheet:: 70V657S15DR.pdf

Description:: IC SRAM 1.125MBIT PAR 208PQFP

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Product details

Overview

70V657S15DR from IDT (Integrated Device Technology) is a high-speed, asynchronous dual-port static RAM with 32K x 36-bit organization (1.152 Mbit), designed for simultaneous independent read/write access from left and right ports in real-time inter-processor communication systems. It supports 3.3V core supply and selectable 3.3V/2.5V I/O on each port, features hardware semaphore arbitration, and delivers 15 ns max access time across industrial temperature range (–40°C to +85°C).

For engineers reviewing the 70V657S15DR datasheet, 70V657S15DR pinout, 70V657S15DR application, or 70V657S15DR equivalent, this page provides verified technical context, pin-level design meaning, true dual-port timing behavior, JTAG-compliant test interface support, and validated alternatives for memory coherency subsystems in telecom line cards, radar signal processors, and FPGA-based data acquisition platforms.

Technical Context

The 70V657S15DR implements fully asynchronous dual-port architecture with independent address, control, and bidirectional I/O buses per port-no internal clock required. Its on-chip arbitration logic resolves contention via BUSY flag signaling and Master/Slave (M/S) configuration, enabling deterministic port prioritization without external logic.

Each port supports byte-selectable 9-bit writes (BE0–BE3), separate chip enables (CE0/CE1), and output enable (OE), allowing partial-word updates and power-gated operation. The device integrates IEEE 1149.1 JTAG boundary-scan capability and hardware semaphore registers accessible via dedicated A0–A2 address lines and SEM control.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	32K x 36 bits (1.152 Mbit); A16 and A15 are no-connect pins per datasheet Note 1 & 2
Access Time (tAA)	15 ns max (industrial grade); defines minimum time from stable address to valid data at outputs
Supply Voltages	VDD = 3.3 V ±150 mV (core); VDDQ = 3.3 V ±150 mV or 2.5 V ±100 mV per port, selected by OPTL/OPTR
Operating Temperature	–40°C to +85°C (industrial grade); validated for sustained operation under thermal cycling in embedded systems
I/O Voltage Compatibility	LVTTL-compatible; supports mixed-voltage system integration with 3.3V/2.5V port independence
JTAG Support	Fully compliant with IEEE 1149.1; includes TDI, TDO, TCK, TMS, TRST for boundary-scan testing and debug
Power Consumption	ISB3 = 6 mA max (full standby, CMOS inputs); IDD = 490 mA max (both ports active, fMAX)

Pinout & Package

70V657S15DR is packaged in a 208-pin Plastic Quad Flatpack (PQFP), body size ≈28 mm × 28 mm × 3.5 mm, with 0.5 mm lead pitch. All VDD pins require connection to 3.3 V; VDDQL/VDDQR must match OPTL/OPTR voltage selection (3.3 V or 2.5 V); all VSS pins connect to ground.

Pin/Terminal	Circuit Role	Design Meaning
CE0L / CE0R	Chip Enable 0 (Left/Right)	Primary enable for memory array access; CE0X = VIL and CE1X = VIH required for valid read/write
R/WL / R/WR	Read/Write Control (Left/Right)	Active-low write enable; drives I/O bus direction: low = write, high = read (when OE active)
OEL / OER	Output Enable (Left/Right)	Controls tri-state of I/O drivers; low enables output drivers, high places I/O in high-impedance state
BE0L–BE3L / BE0R–BE3R	Byte Enables (9-bit groups)	Selects which 9-bit byte (I/O0–8, 9–17, 18–26, 27–35) is written during a write cycle
A0L–A16L / A0R–A16R	Address Inputs (Left/Right)	A16L/A16R and A15L/A15R are NC for 70V657; effective address range is A0–A14 (32K = 2¹⁵)
I/O0L–I/O35L / I/O0R–I/O35R	Bidirectional Data Bus (Left/Right)	36-bit parallel I/O per port; supports simultaneous independent reads/writes to same or different addresses
SEML / SEMR	Semaphore Enable (Left/Right)	Enables access to 8-bit semaphore register (addressed by A0–A2); CE = VIH and SEM = VIL required
BUSYL / BUSYR	Busy Flag (Left/Right)	Output when M/S = VIH (Master); input when M/S = VIL (Slave); signals port contention during same-address access
M/S	Master/Slave Select	Configures BUSY behavior: VIH → BUSY output (Master), VIL → BUSY input (Slave); enables cascaded arbitration
OPTL / OPTR	I/O Voltage Option (Left/Right)	Selects VDDQX level: VIH → 3.3 V I/O, VIL → 2.5 V I/O; sets VDDQL/VDDQR supply requirement
TDI / TDO / TCK / TMS / TRST	JTAG Test Interface	Supports IEEE 1149.1 boundary-scan; enables production test, interconnect verification, and debug visibility

Key Features

Feature	Design Value
True Dual-Port Architecture	Enables concurrent, asynchronous access to any memory location from both ports-no arbitration delay or wait states
Hardware Semaphore Logic	On-chip 8-bit semaphore register with atomic read/write via dedicated SEM control, eliminating need for external locking logic
Independent Port Voltage Scaling	OPTL/OPTR pins allow left/right ports to operate at 3.3 V or 2.5 V I/O levels simultaneously-supports mixed-voltage SoC interfacing
Master/Slave Cascading	M/S pin configures BUSY as output (Master) or input (Slave), enabling depth expansion beyond 36-bit width using multiple devices
Low-Power Standby Modes	Four ISB modes: ISB3 = 6 mA max (full CMOS standby); ISB1 = 100 mA max (TTL-level standby, both ports deselected)
JTAG Boundary-Scan Compliance	Full IEEE 1149.1 implementation with TAP controller, enabling board-level testability and fault isolation in dense PCB layouts

Applications

Telecom Line Card Buffering	Radar Signal Processing FIFO
Use Scenario: High-throughput packet buffering between network processor and framer ASIC in OC-192 line cards. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-wait-state shared memory buffer; left port interfaces to network processor, right port to framer, with semaphore coordination for descriptor management. Use Value: 15 ns access time ensures sub-cycle latency for 66 MHz PCI-X and 100 MHz UTOPIA II interfaces; 32K x 36 capacity supports multi-packet burst storage.	Use Scenario: Real-time transfer of digitized IF samples between ADC front-end and DSP engine in phased-array radar receivers. IC Role / Device Role / Timing Role: Serves as ping-pong memory for continuous sample streaming; one port captures ADC data while the other feeds FFT processing pipeline. Use Value: Asynchronous operation eliminates clock domain crossing logic; BUSY flag prevents read-after-write corruption during simultaneous access to same address.
FPGA-Based Data Acquisition	Industrial Motion Controller Shared Memory
Use Scenario: High-resolution sensor fusion in modular PLC backplanes where FPGA and ARM host exchange timestamped analog/digital measurements. IC Role / Device Role / Timing Role: Provides deterministic, lock-free inter-processor communication channel; semaphore flags coordinate buffer ownership and interrupt generation. Use Value: Industrial temperature rating (–40°C to +85°C) ensures reliability in uncooled enclosures; JTAG support simplifies field firmware validation and trace debugging.	Use Scenario: Coordinating position loop updates between servo drive microcontroller and motion trajectory planner in CNC machine controllers. IC Role / Device Role / Timing Role: Acts as shared parameter table and status register bank; left port updated by planner, right port read by drive firmware at 10 kHz update rate. Use Value: Independent 2.5 V/3.3 V I/O per port allows direct interfacing to 2.5 V FPGA I/O banks and 3.3 V MCU GPIOs without level shifters.

Telecom Line Card Buffering

Radar Signal Processing FIFO

Use Scenario: High-throughput packet buffering between network processor and framer ASIC in OC-192 line cards.

IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-wait-state shared memory buffer; left port interfaces to network processor, right port to framer, with semaphore coordination for descriptor management.

Use Value: 15 ns access time ensures sub-cycle latency for 66 MHz PCI-X and 100 MHz UTOPIA II interfaces; 32K x 36 capacity supports multi-packet burst storage.

Use Scenario: Real-time transfer of digitized IF samples between ADC front-end and DSP engine in phased-array radar receivers.

IC Role / Device Role / Timing Role: Serves as ping-pong memory for continuous sample streaming; one port captures ADC data while the other feeds FFT processing pipeline.

Use Value: Asynchronous operation eliminates clock domain crossing logic; BUSY flag prevents read-after-write corruption during simultaneous access to same address.

FPGA-Based Data Acquisition

Industrial Motion Controller Shared Memory

Use Scenario: High-resolution sensor fusion in modular PLC backplanes where FPGA and ARM host exchange timestamped analog/digital measurements.

IC Role / Device Role / Timing Role: Provides deterministic, lock-free inter-processor communication channel; semaphore flags coordinate buffer ownership and interrupt generation.

Use Value: Industrial temperature rating (–40°C to +85°C) ensures reliability in uncooled enclosures; JTAG support simplifies field firmware validation and trace debugging.

Use Scenario: Coordinating position loop updates between servo drive microcontroller and motion trajectory planner in CNC machine controllers.

IC Role / Device Role / Timing Role: Acts as shared parameter table and status register bank; left port updated by planner, right port read by drive firmware at 10 kHz update rate.

Use Value: Independent 2.5 V/3.3 V I/O per port allows direct interfacing to 2.5 V FPGA I/O banks and 3.3 V MCU GPIOs without level shifters.

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	32K x 36, 15 ns access, but only 3.3 V I/O (no 2.5 V option); lacks JTAG and hardware semaphore logic	Requires external arbitration logic and level-shifting for mixed-voltage designs; no built-in boundary-scan	Choose when JTAG testability and hardware semaphores are not required, and system uses uniform 3.3 V I/O
Renesas R1EX24032AS0	32K x 36, 12 ns access, supports 2.5 V/3.3 V I/O per port, but no JTAG; semaphore implemented via software-managed flags in memory map	Relies on firmware for semaphore arbitration; higher CPU overhead and non-atomic flag updates risk race conditions	Prefer when maximum speed (12 ns) is critical and JTAG is unnecessary, but accept added software complexity for synchronization

Compared with 70V657S15DR, CY7C1362BV33 omits critical system-level features (JTAG, hardware semaphore), increasing BOM count and validation effort, while R1EX24032AS0 trades off guaranteed atomicity for speed-making 70V657S15DR the optimal choice for safety-critical or test-intensive dual-processor architectures.

Availability

70V657S15DR is available at Aetrix Electronics and suitable for telecom infrastructure, radar signal processing, FPGA-based data acquisition, and industrial motion control applications requiring stable component supply, long-term lifecycle assurance, and industrial-grade temperature performance.

Supply support for 70V657S15DR 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) is a semiconductor company specializing in timing, memory interface, RF, and high-performance interconnect solutions, acquired by Renesas Electronics in 2019.

The 70V657S15DR belongs to IDT's high-speed asynchronous dual-port SRAM product line, engineered for deterministic, low-latency inter-processor communication in real-time embedded systems where data coherency and timing predictability are essential.

FAQ

What is the memory organization and address space of the 70V657S15DR?

The 70V657S15DR implements a 32K x 36-bit memory array, providing 1.152 Mbit of true dual-port SRAM. Address lines A0–A14 are functional; A15L/A15R and A16L/A16R are no-connect pins per datasheet Notes 1 and 2, confirming the 32K (2¹⁵) depth. Each port accesses the full 32K space independently and asynchronously.

How does the BUSY flag function in Master/Slave configurations with the 70V657S15DR?

In the 70V657S15DR, the M/S pin determines BUSY behavior: when M/S = VIH, BUSYL/BUSYR are outputs that assert during port contention on matching addresses; when M/S = VIL, BUSYL/BUSYR become inputs used by slave devices to detect master-initiated contention. This enables hierarchical arbitration in multi-device systems without external logic.

Can the left and right ports of the 70V657S15DR operate at different I/O voltages simultaneously?

Yes. The 70V657S15DR supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL = VIH configures the left port for 3.3 V I/O (requiring VDDQL = 3.3 V), while OPTR = VIL configures the right port for 2.5 V I/O (requiring VDDQR = 2.5 V). This enables seamless interfacing with mixed-voltage SoCs and FPGAs.

What is the role of the semaphore feature in the 70V657S15DR, and how is it accessed?

The 70V657S15DR includes an on-chip 8-bit semaphore register for inter-processor synchronization. It is accessed by setting CE0/CE1 = VIH and SEM = VIL, then addressing bits A0–A2. Reads return the semaphore value on all 36 I/O lines; writes use I/O0 only. This hardware implementation guarantees atomic flag updates without software intervention or external latches.

Does the 70V657S15DR support JTAG boundary-scan, and what pins are required?

Yes, the 70V657S15DR fully complies with IEEE 1149.1 JTAG. Required pins are TDI (Test Data In), TDO (Test Data Out), TCK (Test Clock), TMS (Test Mode Select), and TRST (Test Reset). These enable boundary-scan testing of PCB interconnects, I/O pin functionality, and system-level debug visibility-critical for high-reliability telecom and defense applications.

70V657S15DR 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:: 1.125Mbit

Memory Organization:: 32K x 36

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-PQFP (28x28)

70V657S15DR FAQ

1.How can I place an order for 70V657S15DR through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V657S15DR 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 70V657S15DR reliable?

The price and inventory of 70V657S15DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V657S15DR is usually 5 days.

3.What payment methods are accepted for 70V657S15DR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V657S15DR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70V657S15DR?

70V657S15DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V657S15DR 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 70V657S15DR?

For technical support, including 70V657S15DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V657S15DR requirements.

6.How does Aetrix verify that 70V657S15DR is sourced from the original manufacturer or authorized distributors?

All 70V657S15DR 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 70V657S15DR meets industry standards.

7.What is the process for return or replacement of 70V657S15DR?

All 70V657S15DR units undergo pre-shipment inspection (PSI). If there is an issue with 70V657S15DR, 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 70V657S15DR part is unused and in its original packaging.

Return procedure for 70V657S15DR:

1.Submit a request within 90 days.

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

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