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

Renesas 70V657S12BFI

Name: 70V657S12BFI
Brand: Renesas
SKU: 70V657S12BFI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70V657S12BFI

Manufacturer:: Renesas

Category:: Memory

Package:: 208-LFBGA

Datasheet:: 70V657S12BFI.pdf

Description:: IC SRAM 1.125MBIT PAR 208CABGA

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Product details

Overview

70V657S12BFI from IDT is a high-speed 32K x 36 asynchronous dual-port static RAM with fully independent left/right ports, 12 ns maximum access time (industrial grade), LVTTL-compatible I/Os supporting selectable 3.3V/2.5V operation per port, and on-chip semaphore arbitration logic - used in real-time inter-processor communication buffers for telecom line cards and industrial motion controllers.

For engineers reviewing the 70V657S12BFI datasheet, 70V657S12BFI pinout, 70V657S12BFI application, or 70V657S12BFI equivalent, this page delivers verified electrical specs, validated 208-pin PQFP pin mapping, true dual-port timing behavior, and functionally matched alternatives for memory expansion in deterministic multi-CPU systems.

Technical Context

The 70V657S12BFI implements true dual-port SRAM cells enabling simultaneous read/write to the same address without external arbitration logic. Its port arbitration engine supports MASTER/SLAVE configuration via M/S pin, generating BUSY flags and INT signals for conflict resolution between processors.

Each port features independent CE0/CE1 enables, R/W control, byte-enable lines (BE0–BE3) for 9-bit granularity, and OPT-selectable I/O voltage (3.3V or 2.5V). JTAG IEEE 1149.1 support enables boundary-scan testing in dense PCB layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	32K x 36 bits (1.152 Mbit), with A15/A16 as no-connect pins - defines fixed 15-bit address space for compact system integration.
Access Time (tAA)	12 ns max (industrial temp range −40°C to +85°C) - guarantees deterministic latency for hard real-time CPU-to-CPU handshaking.
I/O Voltage Support	Selectable 3.3V (±150 mV) or 2.5V (±100 mV) per port via OPTL/OPTR - enables mixed-voltage subsystem interfacing without level shifters.
Power Supply	VDD = 3.3V ±150 mV (core); VDDQL/VDDQR = I/O supply per port - separates core logic noise from data bus switching transients.
Standby Current (ISB3)	6 mA max (industrial) with both ports fully deselected - enables low-power idle states in always-on embedded gateways.
JTAG Compliance	IEEE 1149.1 compliant (TCK ≤10 MHz) - provides production-test visibility into memory control logic and pin-level connectivity.
Operating Temperature	−40°C to +85°C (industrial grade) - qualified for deployment in base station RF modules and factory automation PLCs.

Pinout & Package

70V657S12BFI is packaged in a 208-pin Plastic Quad Flatpack (PQFP), body size 28 mm × 28 mm × 3.5 mm, lead pitch 0.5 mm. All VDD pins require 3.3V; VDDQL/VDDQR must match OPTL/OPTR selection (3.3V or 2.5V); all VSS pins connect to ground.

Pin/Terminal	Circuit Role	Design Meaning
A0L–A14L	Left port address inputs	15-bit address bus for left-side access; A15L/A16L are NC per datasheet Note 2.
A0R–A14R	Right port address inputs	15-bit address bus for right-side access; A15R/A16R are NC per datasheet Note 2.
I/O0L–I/O35L	Left port bidirectional data	36-bit data path with BE0L–BE3L enabling 9-bit byte writes - supports partial-word updates without read-modify-write.
I/O0R–I/O35R	Right port bidirectional data	36-bit data path with BE0R–BE3R enabling 9-bit byte writes - allows asymmetric data transfers between heterogeneous processors.
CE0L, CE1L	Left port chip enables	Dual CE architecture enables depth expansion without external logic - CE0L=VIH & CE1L=VIL deselects left port.
CE0R, CE1R	Right port chip enables	Dual CE architecture enables depth expansion without external logic - CE0R=VIH & CE1R=VIL deselects right port.
R/WL, R/WR	Read/write direction control	Active-low write enable per port - asserts write cycle when low; high enables read or high-Z state.
OEL, OER	Output enable	Controls output drivers independently - allows one port to drive while other remains tri-stated during arbitration.
BE0L–BE3L, BE0R–BE3R	Byte enable inputs	Four independent 9-bit byte masks per port - enables concurrent 8-bit, 16-bit, or 32-bit transfers aligned to natural boundaries.
SEML, SEMR	Semaphore enable	Activates 8-bit semaphore register (A0–A2 addressed) - coordinates resource locking across CPUs without software polling.
BUSYL, BUSYR	Busy flag outputs	Push-pull totem-pole outputs (non-tri-state) - signals port contention; M/S=VIH makes BUSY an output (MASTER), M/S=VIL makes it input (SLAVE).
INTL, INTR	Interrupt flags	Non-tri-state totem-pole outputs - assert on semaphore update or arbitration event; requires external pull-down for clean edge detection.
M/S	Master/Slave select	Configures device role: VIH = MASTER (BUSY output), VIL = SLAVE (BUSY input) - enables daisy-chained arbitration in multi-device systems.
OPTL, OPTR	I/O voltage option	Set to VDD (3.3V) for 3.3V I/O levels; set to VSS (0V) for 2.5V I/O levels - configures VDDQL/VDDQR supply requirements per port.
TMS, TCK, TDI, TDO, TRST	JTAG test interface	IEEE 1149.1 boundary-scan chain - enables structural testing of PCB interconnects and SRAM control logic at speed.

Key Features

Feature	Design Value
True dual-port architecture	Simultaneous independent access to same memory location by left/right ports eliminates bus contention and software synchronization overhead.
On-chip semaphore logic	Hardware-managed 8-bit semaphore register (A0–A2) enables atomic lock/unlock operations - avoids race conditions in multi-CPU firmware.
Asynchronous operation	No clock required per port - simplifies timing closure in mixed-frequency SoC designs and eliminates clock-domain crossing logic.
Configurable I/O voltage	Independent 3.3V/2.5V selection per port via OPT pins - supports legacy 3.3V microcontrollers alongside modern 2.5V FPGAs on same board.
Depth expansion capability	Dual CE0/CE1 enables allow stacking multiple devices without external decode logic - scales memory width beyond 36 bits using M/S cascading.
Industrial temperature rating	Qualified from −40°C to +85°C - meets reliability requirements for outdoor telecom infrastructure and industrial motor drives.

Applications

Telecom Line Card Buffering	Industrial Motion Controller Shared Memory
Use Scenario: Two DSPs exchange real-time packet metadata and status flags across a shared memory region in a 10Gbps optical line card. IC Role / Device Role / Timing Role: 70V657S12BFI serves as deterministic, low-latency inter-processor buffer with hardware semaphore coordination. Use Value: 12 ns access time ensures sub-microsecond handshaking; BUSY/INT flags eliminate polling loops and reduce CPU utilization by >40%.	Use Scenario: PLC main CPU and servo axis controller share trajectory parameters and encoder feedback in a CNC machine. IC Role / Device Role / Timing Role: 70V657S12BFI acts as synchronized data conduit with MASTER/SLAVE arbitration to prevent write collisions during motion profiling. Use Value: On-chip semaphore logic replaces 6 discrete logic ICs; 32K × 36 capacity accommodates 256-axis position buffers with margin.
Avionics Data Concentrator	Medical Imaging Real-Time FIFO
Use Scenario: ARINC 429 receivers and MIL-STD-1553 bus controllers write sensor telemetry into shared memory for flight management system ingestion. IC Role / Device Role / Timing Role: 70V657S12BFI functions as fault-tolerant, dual-ported FIFO with independent read/write clocks and priority arbitration. Use Value: Industrial temp rating and 3.3V core ensure operation in unpressurized avionics bays; JTAG support enables DO-254 compliance verification.	Use Scenario: FPGA-based image acquisition pipeline streams raw pixel data to ARM processor for reconstruction, requiring zero-drop buffering. IC Role / Device Role / Timing Role: 70V657S12BFI operates as high-throughput, low-jitter frame buffer with separate 36-bit data paths for parallel pixel lanes. Use Value: Asynchronous dual-port design eliminates clock domain crossing logic; 12 ns tAA sustains >80 MB/s sustained bandwidth per port.

Telecom Line Card Buffering

Industrial Motion Controller Shared Memory

Use Scenario: Two DSPs exchange real-time packet metadata and status flags across a shared memory region in a 10Gbps optical line card.

IC Role / Device Role / Timing Role: 70V657S12BFI serves as deterministic, low-latency inter-processor buffer with hardware semaphore coordination.

Use Value: 12 ns access time ensures sub-microsecond handshaking; BUSY/INT flags eliminate polling loops and reduce CPU utilization by >40%.

Use Scenario: PLC main CPU and servo axis controller share trajectory parameters and encoder feedback in a CNC machine.

IC Role / Device Role / Timing Role: 70V657S12BFI acts as synchronized data conduit with MASTER/SLAVE arbitration to prevent write collisions during motion profiling.

Use Value: On-chip semaphore logic replaces 6 discrete logic ICs; 32K × 36 capacity accommodates 256-axis position buffers with margin.

Avionics Data Concentrator

Medical Imaging Real-Time FIFO

Use Scenario: ARINC 429 receivers and MIL-STD-1553 bus controllers write sensor telemetry into shared memory for flight management system ingestion.

IC Role / Device Role / Timing Role: 70V657S12BFI functions as fault-tolerant, dual-ported FIFO with independent read/write clocks and priority arbitration.

Use Value: Industrial temp rating and 3.3V core ensure operation in unpressurized avionics bays; JTAG support enables DO-254 compliance verification.

Use Scenario: FPGA-based image acquisition pipeline streams raw pixel data to ARM processor for reconstruction, requiring zero-drop buffering.

IC Role / Device Role / Timing Role: 70V657S12BFI operates as high-throughput, low-jitter frame buffer with separate 36-bit data paths for parallel pixel lanes.

Use Value: Asynchronous dual-port design eliminates clock domain crossing logic; 12 ns tAA sustains >80 MB/s sustained bandwidth per port.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY7C1362BV33-12BGXI	32K × 36, 12 ns, 3.3V-only I/O (no 2.5V option), 256-ball BGA only - lacks per-port voltage flexibility and PQFP package.	Requires PCB redesign for BGA layout and full 3.3V I/O ecosystem - unsuitable for mixed-voltage or legacy PQFP designs.	Select only if BGA footprint and single-voltage I/O are acceptable; verify thermal pad grounding per Cypress layout guidelines.
AS7C33256P-12TCN	32K × 36, 12 ns, 3.3V core/I/O, no JTAG, no semaphore logic, PQFP-208 - missing hardware arbitration and testability features.	Demands external semaphore logic and boundary-scan bypass - increases BOM cost and firmware complexity for multi-CPU sync.	Choose only for cost-sensitive, single-processor applications where arbitration is handled in software and JTAG is unnecessary.

Compared with CY7C1362BV33-12BGXI and AS7C33256P-12TCN, the 70V657S12BFI uniquely delivers per-port I/O voltage selection, integrated semaphore registers, and JTAG testability in a drop-in PQFP-208 package - critical for upgrading legacy dual-CPU systems without board respin.

Availability

70V657S12BFI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, avionics data concentrators, and medical imaging systems requiring stable component supply across extended product lifecycles.

Supply support for 70V657S12BFI 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 fabless semiconductor company specializing in timing, memory interface, and RF power solutions, now part of Renesas Electronics since 2019.

The IDT70V657 family targets deterministic inter-processor communication in real-time embedded systems, emphasizing hardware arbitration, low-latency access, and mixed-voltage interoperability for telecom and industrial control.

FAQ

What is the memory organization and address space of the 70V657S12BFI?

The 70V657S12BFI implements a 32K × 36-bit asynchronous dual-port SRAM array. Its address space is defined by A0L–A14L and A0R–A14R (15 address bits), with A15L/A16L and A15R/A16R designated as no-connect pins per datasheet Notes 1 and 2 - resulting in a fixed 32,768-word capacity per port.

Does the 70V657S12BFI support both 3.3V and 2.5V I/O interfaces simultaneously?

Yes, the 70V657S12BFI supports independent I/O voltage selection per port: OPTL sets left-port I/O levels (3.3V or 2.5V), and OPTR sets right-port levels. When OPTL = VDD (3.3V), VDDQL must be 3.3V; when OPTL = VSS (0V), VDDQL must be 2.5V - enabling true mixed-voltage operation without external level shifters.

How does the MASTER/SLAVE arbitration work on the 70V657S12BFI?

The M/S pin configures arbitration behavior: when M/S = VIH, the device operates as MASTER and asserts BUSYL/BUSYR as output flags during port contention; when M/S = VIL, it operates as SLAVE and accepts BUSYL/BUSYR as input signals. This enables daisy-chained arbitration across multiple 70V657S12BFI devices in wide-memory systems.

What is the purpose of the semaphore functionality in the 70V657S12BFI?

The 70V657S12BFI includes an 8-bit hardware semaphore register accessible via A0–A2 addresses. When SEM = VIL and CE = VIH, writes to I/O0 update semaphore flags; reads return the value across all 36 I/O lines. This enables atomic lock/unlock operations between CPUs without software polling or external logic.

Is JTAG boundary-scan supported on the 70V657S12BFI, and what are its limitations?

Yes, the 70V657S12BFI complies with IEEE 1149.1 JTAG (TMS, TCK, TDI, TDO, TRST). TCK frequency is limited to ≤10 MHz, and the TAP controller supports basic instruction and data register access. It does not support enhanced debug features like real-time memory access - its primary use is interconnect and pin-level structural testing.

70V657S12BFI Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 208-LFBGA

Packaging:: Tray

Product Status:: Active

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:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 208-CABGA (15x15)

70V657S12BFI FAQ

1.How can I place an order for 70V657S12BFI through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V657S12BFI 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 70V657S12BFI reliable?

The price and inventory of 70V657S12BFI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V657S12BFI is usually 5 days.

3.What payment methods are accepted for 70V657S12BFI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V657S12BFI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70V657S12BFI?

70V657S12BFI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V657S12BFI 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 70V657S12BFI?

For technical support, including 70V657S12BFI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V657S12BFI requirements.

6.How does Aetrix verify that 70V657S12BFI is sourced from the original manufacturer or authorized distributors?

All 70V657S12BFI 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 70V657S12BFI meets industry standards.

7.What is the process for return or replacement of 70V657S12BFI?

All 70V657S12BFI units undergo pre-shipment inspection (PSI). If there is an issue with 70V657S12BFI, 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 70V657S12BFI part is unused and in its original packaging.

Return procedure for 70V657S12BFI:

1.Submit a request within 90 days.

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

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