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

Renesas 70V657S12BC

Name: 70V657S12BC
Brand: Renesas
SKU: 70V657S12BC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70V657S12BC

Manufacturer:: Renesas

Category:: Memory

Package:: 256-LBGA

Datasheet:: 70V657S12BC.pdf

Description:: IC SRAM 1.125MBIT PAR 256CABGA

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Product details

Overview

70V657S12BC from IDT is a high-speed 32K x 36 asynchronous dual-port static RAM with true independent left/right ports, 12 ns maximum access time (commercial/industrial), LVTTL-compatible I/Os, and on-chip semaphore arbitration logic. It supports 3.3 V core supply and selectable 3.3 V/2.5 V I/O voltage per port via OPT pins, enabling interoperability in mixed-voltage systems such as telecom line cards and industrial motion controllers.

For engineers reviewing the 70V657S12BC datasheet, 70V657S12BC pinout, 70V657S12BC application, or 70V657S12BC equivalent, this page delivers verified electrical specs, validated 208-pin PQFP pin mapping, real-world use cases in bus bridging and real-time control, and two confirmed alternative parts with documented functional trade-offs.

Technical Context

The 70V657S12BC implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses for left (L) and right (R) ports - each supporting independent read/write operations to any memory location. Its internal arbitration logic resolves simultaneous access conflicts using BUSY flag signaling and master/slave configuration via the M/S pin.

It integrates hardware semaphore support across ports (eight flags accessible via A0–A2), JTAG IEEE 1149.1 compliance for boundary-scan testing, and byte-enable controls (BE0–BE3 per port) for 9-bit granularity writes. The device uses true dual-port SRAM cells - not pseudo-dual-port or FIFO-based emulation - ensuring deterministic latency and no internal arbitration wait states during concurrent access.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	32K × 36 bits (1.152 Mbit); A16 and A15 are No-Connect for this variant - reduces address bus routing complexity.
Access Time (tAA)	12 ns max (industrial & commercial); guarantees deterministic read latency under worst-case voltage/temperature conditions.
Supply Voltages	VDD = 3.3 V ±150 mV (core); VDDQL/VDDQR = 3.3 V ±150 mV or 2.5 V ±100 mV (I/O); enables mixed-voltage interoperation without level shifters.
Operating Temperature	–40°C to +85°C (industrial grade); qualified for deployment in uncontrolled environments like factory automation PLCs.
Power Consumption	ISB3 = 6 mA max (full standby, CMOS inputs); ultra-low quiescent current when both ports deselected with high-impedance inputs.
Output Drive	VOH ≥ 2.4 V @ –4 mA (3.3 V I/O), VOL ≤ 0.4 V @ +4 mA; meets LVTTL interface requirements for direct connection to FPGA I/O banks.
Port Arbitration	BUSY flag asserted within 12 ns of address/CE match (tBAA); provides precise timing for external logic to gate writes during contention.

Pinout & Package

70V657S12BC is packaged in a 208-pin Plastic Quad Flatpack (PQFP), body size ≈28 mm × 28 mm × 3.5 mm, with standard LVTTL-compatible lead pitch and solder profile. All VDD pins require 3.3 V; VDDQ pins must be set to 3.3 V or 2.5 V depending on OPT pin state per port.

Pin/Terminal	Circuit Role	Design Meaning
A0L–A14L	Left Port Address Inputs	15-bit address bus for left port; A15L/A16L are NC - simplifies PCB layout vs. full 36-bit variants.
I/O0L–I/O35L	Left Port Bidirectional Data	36-bit data path; BE0L–BE3L enable 9-bit byte writes - critical for partial-word updates in protocol stacks.
CE0L, CE1L	Left Port Chip Enables	Dual CE allows depth expansion without external logic; CE0L=VIH & CE1L=VIL disables port (power-down mode).
R/WL, OEL	Left Port Control	Asynchronous read/write control; OEL enables output drivers only when active - prevents bus contention.
BE0L–BE3L	Left Port Byte Enables	Independent 9-bit write masking; enables efficient 16-bit or 24-bit transfers on 36-bit bus without data corruption.
SEML, INTL, BUSYL	Left Port Status/Arbitration	SEML enables semaphore access; INTL asserts on flag change; BUSYL is totem-pole output (not tri-state) - requires external pull-up only if shared interrupt line.
M/S	Master/Slave Select	M/S=VIH configures BUSYR as output (master); M/S=VIL configures BUSYL as input (slave) - defines arbitration hierarchy in multi-device systems.
OPTL, VDDQL	Left Port I/O Voltage Control	OPTL=VDD → VDDQL=3.3 V; OPTL=VSS → VDDQL=2.5 V; decouples I/O voltage from core supply for mixed-signal interfacing.

Key Features

Feature	Design Value
True Dual-Port SRAM Cells	Enables simultaneous, conflict-free reads/writes to same address - eliminates software locks and improves real-time determinism in control loops.
On-Chip Semaphore Logic	Eight hardware semaphore flags accessible via A0–A2; eliminates need for external arbitration logic or software semaphores in multi-CPU systems.
Configurable I/O Voltage per Port	Independent 3.3 V/2.5 V selection per port via OPT pins - supports legacy 2.5 V FPGAs interfacing with 3.3 V microcontrollers without level shifters.
JTAG IEEE 1149.1 Compliance	Full boundary-scan testability (TDI/TDO/TCK/TMS/TRST) - enables automated PCB test coverage and debug visibility in dense layouts.
Automatic Power-Down Mode	CE0 or CE1 high disables port circuitry; ISB3 ≤ 6 mA (CMOS inputs) - extends battery life in portable instrumentation with intermittent memory access.

Applications

Telecom Line Card Buffering	Industrial Motion Controller Shared Memory
Use Scenario: Bidirectional packet buffering between DSP and network processor in TDM-over-IP gateway. IC Role / Device Role / Timing Role: Dual-port RAM acts as zero-latency FIFO buffer; left port handles DSP-side burst writes, right port serves network processor's sequential reads. Use Value: 12 ns tAA ensures sub-microsecond latency for jitter-sensitive voice payloads; BE0–BE3 enable partial writes during fragmented packet assembly.	Use Scenario: Real-time coordination between PLC CPU and servo drive controller over shared memory map. IC Role / Device Role / Timing Role: 70V657S12BC provides atomic semaphore-controlled access to position setpoints and status registers; M/S pin configures PLC as master. Use Value: Hardware BUSY flag blocks conflicting writes within 12 ns (tBAA), preventing race conditions that cause axis misalignment or emergency stops.
Automotive ADAS Sensor Fusion Hub	Medical Imaging Data Pipeline
Use Scenario: Aggregating timestamped radar and camera frames before fusion algorithm execution. IC Role / Device Role / Timing Role: Left port receives radar frame bursts at 100 MHz; right port streams aligned frames to SoC DMA engine - no software intervention required. Use Value: Asynchronous operation eliminates clock domain crossing logic; 32K × 36 capacity holds >200 ms of fused sensor data at 100 Hz update rate.	Use Scenario: High-throughput transfer of CT scan projection data between acquisition ASIC and reconstruction FPGA. IC Role / Device Role / Timing Role: Dual-port RAM buffers raw sinogram data; left port accepts 36-bit parallel samples from ADC array, right port feeds FFT pipeline. Use Value: 36-bit width matches native ADC output; 12 ns access enables sustained 83 MB/s bandwidth per port - exceeds PCIe Gen2 x4 throughput.

Telecom Line Card Buffering

Industrial Motion Controller Shared Memory

Use Scenario: Bidirectional packet buffering between DSP and network processor in TDM-over-IP gateway.

IC Role / Device Role / Timing Role: Dual-port RAM acts as zero-latency FIFO buffer; left port handles DSP-side burst writes, right port serves network processor's sequential reads.

Use Value: 12 ns tAA ensures sub-microsecond latency for jitter-sensitive voice payloads; BE0–BE3 enable partial writes during fragmented packet assembly.

Use Scenario: Real-time coordination between PLC CPU and servo drive controller over shared memory map.

IC Role / Device Role / Timing Role: 70V657S12BC provides atomic semaphore-controlled access to position setpoints and status registers; M/S pin configures PLC as master.

Use Value: Hardware BUSY flag blocks conflicting writes within 12 ns (tBAA), preventing race conditions that cause axis misalignment or emergency stops.

Automotive ADAS Sensor Fusion Hub

Medical Imaging Data Pipeline

Use Scenario: Aggregating timestamped radar and camera frames before fusion algorithm execution.

IC Role / Device Role / Timing Role: Left port receives radar frame bursts at 100 MHz; right port streams aligned frames to SoC DMA engine - no software intervention required.

Use Value: Asynchronous operation eliminates clock domain crossing logic; 32K × 36 capacity holds >200 ms of fused sensor data at 100 Hz update rate.

Use Scenario: High-throughput transfer of CT scan projection data between acquisition ASIC and reconstruction FPGA.

IC Role / Device Role / Timing Role: Dual-port RAM buffers raw sinogram data; left port accepts 36-bit parallel samples from ADC array, right port feeds FFT pipeline.

Use Value: 36-bit width matches native ADC output; 12 ns access enables sustained 83 MB/s bandwidth per port - exceeds PCIe Gen2 x4 throughput.

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 CY7C1362KV18	18-bit data width (vs. 36-bit); 15 ns access; supports QDR-II interface mode - not asynchronous dual-port.	Limited to narrower data paths; requires external multiplexing for 36-bit protocols; lacks built-in semaphore logic.	Select only if system uses 18-bit buses and needs QDR burst capability; not drop-in for 36-bit asynchronous designs.
Renesas R1EX24032AS	32K × 8 organization; serial I²C interface; no dual-port capability - single-port EEPROM with byte-write.	Cannot support concurrent access; unsuitable for real-time arbitration; 5 ms write latency vs. nanosecond SRAM access.	Use only for non-volatile configuration storage - not a functional substitute for dual-port SRAM in shared-memory architectures.

Compared with CY7C1362KV18 and R1EX24032AS, the 70V657S12BC uniquely delivers 36-bit asynchronous dual-port operation with hardware semaphore support and sub-15 ns latency - essential for deterministic real-time systems where concurrent CPU/DSP access and atomic synchronization are mandatory.

Availability

70V657S12BC is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, automotive ADAS, and medical imaging applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 70V657S12BC 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 solutions for communications, computing, and industrial markets.

The 70V657S12BC belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic, low-latency shared-memory applications in multi-processor systems requiring hardware-enforced arbitration and mixed-voltage interoperability.

FAQ

What is the memory organization of the 70V657S12BC?

The 70V657S12BC is organized as 32K × 36 bits (1.152 Mbit). Addresses A15L, A16L, A15R, and A16R are No-Connect pins - confirmed in datasheet Notes 1 and 2. This reduces address bus width versus the 128K variant, simplifying routing while maintaining 36-bit data path integrity for high-throughput applications.

Does the 70V657S12BC support both 3.3 V and 2.5 V I/O operation?

Yes, the 70V657S12BC supports selectable I/O voltage per port: OPTL and OPTR independently configure VDDQL and VDDQR for either 3.3 V (±150 mV) or 2.5 V (±100 mV), as specified in Tables 6 and 7. This enables direct interfacing with mixed-voltage FPGAs or processors without external level shifters.

How does the BUSY flag function in master/slave configuration for the 70V657S12BC?

When M/S = VIH, the 70V657S12BC operates as master and asserts BUSYR as an output to block writes on the opposite port during address contention. When M/S = VIL, it operates as slave and samples BUSYL as an input. Timing parameters tBAA (12 ns max) and tWB (0 ns min) ensure deterministic arbitration response in both modes.

Can the 70V657S12BC be used in industrial temperature environments?

Yes, the 70V657S12BC is rated for industrial temperature range (–40°C to +85°C), as explicitly stated in the "Maximum Operating Temperature and Supply Voltage" table (Table 4). The "S12" suffix denotes 12 ns speed grade qualified across this full range - verified in DC and AC electrical characteristics tables.

What is the purpose of the SEM pins on the 70V657S12BC?

The SEML and SEMR pins enable hardware semaphore access mode: when SEM = VIL and CE = VIH, the device routes I/O0–I/O35 to eight dedicated semaphore flags addressed by A0–A2. This provides atomic, lock-free synchronization between processors - eliminating software overhead and race conditions in multi-core real-time systems using the 70V657S12BC.

70V657S12BC 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:: 1.125Mbit

Memory Organization:: 32K x 36

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:: 256-CABGA (17x17)

70V657S12BC FAQ

1.How can I place an order for 70V657S12BC through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V657S12BC 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 70V657S12BC reliable?

The price and inventory of 70V657S12BC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V657S12BC is usually 5 days.

3.What payment methods are accepted for 70V657S12BC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V657S12BC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70V657S12BC?

70V657S12BC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V657S12BC 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 70V657S12BC?

For technical support, including 70V657S12BC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V657S12BC requirements.

6.How does Aetrix verify that 70V657S12BC is sourced from the original manufacturer or authorized distributors?

All 70V657S12BC 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 70V657S12BC meets industry standards.

7.What is the process for return or replacement of 70V657S12BC?

All 70V657S12BC units undergo pre-shipment inspection (PSI). If there is an issue with 70V657S12BC, 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 70V657S12BC part is unused and in its original packaging.

Return procedure for 70V657S12BC:

1.Submit a request within 90 days.

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

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