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

Renesas 70V658S15BF

Name: 70V658S15BF
Brand: Renesas
SKU: 70V658S15BF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70V658S15BF

Manufacturer:: Renesas

Category:: Memory

Package:: 208-LFBGA

Datasheet:: 70V658S15BF.pdf

Description:: IC SRAM 2MBIT PARALLEL 208CABGA

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Product details

Overview

70V658S15BF from IDT is a high-speed, asynchronous dual-port static RAM with 64K × 36-bit organization (2.3 Mbit), supporting simultaneous independent access from left and right ports, 15 ns maximum access time, LVTTL-compatible 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 legacy bus arbitration systems.

For engineers reviewing the 70V658S15BF datasheet, 70V658S15BF pinout, 70V658S15BF application, or 70V658S15BF equivalent, this page delivers verified technical context, validated pin functions, true dual-port timing behavior, industrial-grade thermal specs (–40°C to +85°C), and precise alternative selection guidance for memory expansion and master/slave cascading in deterministic embedded systems.

Technical Context

The 70V658S15BF implements true dual-port SRAM architecture with fully asynchronous operation on both ports, enabling concurrent read/write to the same memory location without external arbitration logic. It integrates on-chip semaphore signaling, BUSY flag arbitration, and JTAG IEEE 1149.1 compliance for boundary scan testing.

Each port features independent chip enables (CE0/CE1), byte enables (BE0–BE3) for 9-bit granularity, separate address buses (A0–A16L/R, with A16 NC), and configurable I/O voltage via OPTL/OPTR pins - allowing mixed-voltage interfacing (e.g., 3.3 V left port, 2.5 V right port) while maintaining 3.3 V core supply (VDD).

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	64K × 36 bits (2.304 Mbit); supports depth expansion using dual CE enables and master/slave cascading for ≥72-bit word systems.
Access Time (tAA)	15 ns max (industrial temp range); guarantees deterministic latency for hard real-time inter-processor data exchange.
Supply Voltages	VDD = 3.3 V ±150 mV (core); VDDQL/VDDQR = 3.3 V ±150 mV or 2.5 V ±100 mV (I/O), selected independently per port via OPTL/OPTR.
Operating Temperature	–40°C to +85°C (industrial grade); validated for continuous operation in ruggedized control and telecom infrastructure.
Port Arbitration	Hardware semaphore logic with SEM/SEML/SEMR, BUSYL/BUSYR flags, and M/S pin for master/slave role assignment - eliminates need for external arbitration logic.
JTAG Support	Fully compliant with IEEE 1149.1; includes TDI, TDO, TCK, TMS, TRST pins for production test and debug of multi-port memory subsystems.
Power Management	Four standby modes (ISB1–ISB4); full CMOS-level standby draws ≤15 mA (typ. 6 mA), enabling low-power idle states in battery-backed systems.

Pinout & Package

70V658S15BF is packaged in a 208-pin Plastic Quad Flatpack (PQFP), 28 mm × 28 mm body, 0.5 mm lead pitch. Pin functions are validated per IDT 4869 drw 02 and 4869 tbl 01.

Pin/Terminal	Circuit Role	Design Meaning
A0L–A15L	Left Port Address Inputs	16-bit address bus for left port; A16L is no-connect (NC) per IDT note 1 - confirms 64K depth (2¹⁶ = 65,536 words).
I/O0L–I/O35L	Left Port Bidirectional Data	36-bit data interface; BE0L–BE3L enable 9-bit byte writes - critical for partial-word updates in protocol stacks.
CE0L, CE1L	Left Port Chip Enables	Dual CE inputs allow depth expansion without glue logic; CE0L = VIL & CE1L = VIH selects left port (per Truth Table I).
R/WL, OEL	Left Port Control	R/WL controls direction (read/write); OEL enables output drivers - both required active-low for valid reads.
SEML, BUSYL, INTL	Left Port Arbitration Signals	SEML enables semaphore access; BUSYL is totem-pole output (not tri-state); INTL signals cross-port event completion.
OPTL, VDDQL	Left Port I/O Voltage Control	OPTL = VDD → VDDQL = 3.3 V; OPTL = VSS → VDDQL = 2.5 V - enables mixed-voltage system integration.
M/S	Master/Slave Select	M/S = VIH configures device as master (BUSYR output); M/S = VIL configures as slave (BUSYR input) - defines arbitration hierarchy.
TCK, TMS, TDI, TDO, TRST	JTAG Test Interface	Full boundary-scan support per IEEE 1149.1; TRST resets TAP controller - essential for automated PCB test.

Key Features

Feature	Design Value
True Dual-Port Architecture	Simultaneous read/write to identical addresses on left/right ports - enables lock-free inter-processor messaging without software overhead.
Configurable I/O Voltage Per Port	Independent 3.3 V/2.5 V selection via OPTL/OPTR allows direct interfacing with mixed-voltage FPGAs, ASICs, or legacy microcontrollers.
Hardware Semaphore Logic	Eight dedicated semaphore flags (addressed by A0–A2) accessible via I/O0–I/O35 - eliminates polling and reduces CPU load in multi-core coordination.
Master/Slave Cascading	Supports ≥72-bit word systems using M/S pin and BUSY flag chaining - enables error-free expansion without speed penalty or discrete logic.
Industrial Temperature Range	Guaranteed operation from –40°C to +85°C with 15 ns access time - qualified for deployment in base stations, motor drives, and railway control units.
JTAG Boundary Scan	IEEE 1149.1-compliant test interface with full TAP controller - simplifies manufacturing test coverage and field diagnostics for high-reliability systems.

Applications

Real-Time Inter-Processor Communication	FPGA Co-Processing Buffer
Use Scenario: Two microcontrollers exchange status, command, and telemetry data with zero-latency handshaking in an industrial PLC. IC Role / Device Role / Timing Role: 70V658S15BF acts as a shared memory buffer with hardware semaphore arbitration - eliminating software locks and ensuring deterministic response. Use Value: Enables sub-15 ns inter-core data transfer with automatic conflict resolution, reducing firmware complexity and jitter in motion control loops.	Use Scenario: An FPGA offloads image preprocessing while a host ARM processor manages UI and network stack in a medical imaging device. IC Role / Device Role / Timing Role: 70V658S15BF serves as a high-bandwidth, low-latency frame buffer between FPGA and ARM - with independent 36-bit ports operating at different voltages. Use Value: Provides 72 MB/s sustained throughput (15 ns cycle × 36 bits) and eliminates DMA bottlenecks during real-time video streaming.
Legacy Bus Arbitration Bridge	Telecom Line Card Buffer
Use Scenario: Integrating a modern DSP into a legacy VMEbus system requiring synchronous data exchange with existing 32-bit controllers. IC Role / Device Role / Timing Role: 70V658S15BF bridges mismatched bus widths and speeds - left port interfaces to VME (32-bit + BE), right port to DSP (36-bit). Use Value: Enables drop-in replacement of aging dual-port RAMs while preserving timing margins and supporting 2.5 V I/O for newer peripherals.	Use Scenario: Storing packet headers and metadata in a carrier-grade Ethernet line card handling 10 Gbps traffic with strict jitter requirements. IC Role / Device Role / Timing Role: 70V658S15BF operates as a dual-port descriptor ring buffer - one port for ingress packet parsing, the other for egress scheduling. Use Value: Guarantees 15 ns access time across –40°C to +85°C, ensuring consistent packet queuing latency under thermal stress in outdoor cabinets.

Real-Time Inter-Processor Communication

FPGA Co-Processing Buffer

Use Scenario: Two microcontrollers exchange status, command, and telemetry data with zero-latency handshaking in an industrial PLC.

IC Role / Device Role / Timing Role: 70V658S15BF acts as a shared memory buffer with hardware semaphore arbitration - eliminating software locks and ensuring deterministic response.

Use Value: Enables sub-15 ns inter-core data transfer with automatic conflict resolution, reducing firmware complexity and jitter in motion control loops.

Use Scenario: An FPGA offloads image preprocessing while a host ARM processor manages UI and network stack in a medical imaging device.

IC Role / Device Role / Timing Role: 70V658S15BF serves as a high-bandwidth, low-latency frame buffer between FPGA and ARM - with independent 36-bit ports operating at different voltages.

Use Value: Provides 72 MB/s sustained throughput (15 ns cycle × 36 bits) and eliminates DMA bottlenecks during real-time video streaming.

Legacy Bus Arbitration Bridge

Telecom Line Card Buffer

Use Scenario: Integrating a modern DSP into a legacy VMEbus system requiring synchronous data exchange with existing 32-bit controllers.

IC Role / Device Role / Timing Role: 70V658S15BF bridges mismatched bus widths and speeds - left port interfaces to VME (32-bit + BE), right port to DSP (36-bit).

Use Value: Enables drop-in replacement of aging dual-port RAMs while preserving timing margins and supporting 2.5 V I/O for newer peripherals.

Use Scenario: Storing packet headers and metadata in a carrier-grade Ethernet line card handling 10 Gbps traffic with strict jitter requirements.

IC Role / Device Role / Timing Role: 70V658S15BF operates as a dual-port descriptor ring buffer - one port for ingress packet parsing, the other for egress scheduling.

Use Value: Guarantees 15 ns access time across –40°C to +85°C, ensuring consistent packet queuing latency under thermal stress in outdoor cabinets.

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	64K × 36, 15 ns, 3.3 V only (no 2.5 V I/O option); no JTAG; uses different BUSY arbitration model (active-low open-drain).	Lacks per-port I/O voltage flexibility and IEEE 1149.1 test support - unsuitable where mixed-voltage FPGA interfacing or production test coverage is required.	Select when cost sensitivity outweighs configurability needs and JTAG is not mandated in test plan.
AS7C362000B-15TIN	64K × 36, 15 ns, 3.3 V core/I/O; no semaphore logic; no M/S cascade capability; PQFP-208 package.	Requires external arbitration logic for multi-processor use; no hardware semaphores or BUSY flag chaining - increases BOM count and layout complexity.	Choose only for simple dual-port buffering where arbitration is handled in software or external CPLD.

Compared with CY7C1362BV33-15ZXI and AS7C362000B-15TIN, the 70V658S15BF uniquely delivers per-port I/O voltage selection, integrated JTAG, and hardware semaphore arbitration - making it the sole option for deterministic, mixed-voltage, test-ready dual-port memory in industrial and telecom designs.

Availability

70V658S15BF is available at Aetrix Electronics and suitable for real-time inter-processor communication, FPGA co-processing buffers, and telecom line card buffers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70V658S15BF 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), now part of Renesas Electronics, specializes in high-performance timing, memory, and interface ICs for communications, computing, and industrial markets.

The 70V658S15BF belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor data exchange in mission-critical embedded systems.

FAQ

What is the exact memory capacity and organization of the 70V658S15BF?

The 70V658S15BF provides 64K × 36-bit organization (2.304 Mbit total), with A0–A15L/R as valid address inputs and A16L/R designated as no-connect (NC) pins per IDT documentation. This configuration supports 65,536 unique 36-bit words, optimized for 72-bit or wider systems via master/slave cascading.

Does the 70V658S15BF support mixed I/O voltage operation between its two ports?

Yes - the 70V658S15BF supports independent I/O voltage selection per port: OPTL sets left-port I/O voltage (3.3 V or 2.5 V), and OPTR sets right-port I/O voltage. VDDQL and VDDQR must be supplied accordingly, enabling direct interfacing with heterogeneous logic families without level shifters.

How does the BUSY flag function in master vs. slave configuration for the 70V658S15BF?

When M/S = VIH, the 70V658S15BF operates as master: BUSYR is an active-high totem-pole output indicating contention. When M/S = VIL, it operates as slave: BUSYR becomes an input that must be driven externally - enabling hierarchical arbitration in multi-device systems.

Is JTAG boundary scan supported on the 70V658S15BF, and which pins are used?

Yes - the 70V658S15BF fully complies with IEEE 1149.1. JTAG functionality uses dedicated pins: TDI (pin 1), TDO (pin 2), TCK (pin 4), TMS (pin 3), and TRST (pin 5), all located on the PQFP package per IDT 4869 drw 02. No configuration registers or external pull-ups are required.

What are the power consumption characteristics of the 70V658S15BF in industrial temperature operation?

In industrial grade (–40°C to +85°C), the 70V658S15BF draws up to 490 mA dynamic current (both ports active), 125 mA standby with TTL-level inputs (ISB1), and as low as 15 mA in full CMOS-level standby (ISB3). These values are specified in IDT 4869 tbl 10 for the S15 speed grade.

70V658S15BF 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:: 2Mbit

Memory Organization:: 64K 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-CABGA (15x15)

70V658S15BF FAQ

1.How can I place an order for 70V658S15BF through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V658S15BF 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 70V658S15BF reliable?

The price and inventory of 70V658S15BF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V658S15BF is usually 5 days.

3.What payment methods are accepted for 70V658S15BF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V658S15BF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70V658S15BF?

70V658S15BF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V658S15BF 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 70V658S15BF?

For technical support, including 70V658S15BF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V658S15BF requirements.

6.How does Aetrix verify that 70V658S15BF is sourced from the original manufacturer or authorized distributors?

All 70V658S15BF 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 70V658S15BF meets industry standards.

7.What is the process for return or replacement of 70V658S15BF?

All 70V658S15BF units undergo pre-shipment inspection (PSI). If there is an issue with 70V658S15BF, 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 70V658S15BF part is unused and in its original packaging.

Return procedure for 70V658S15BF:

1.Submit a request within 90 days.

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

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