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

Renesas 70V657S12BCGI

Name: 70V657S12BCGI
Brand: Renesas
SKU: 70V657S12BCGI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70V657S12BCGI

Manufacturer:: Renesas

Category:: Memory

Package:: 256-LBGA

Datasheet:: 70V657S12BCGI.pdf

Description:: IC SRAM 1.125MBIT PAR 256CABGA

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Product details

Overview

70V657S12BCGI from IDT is a high-speed 32K x 36 asynchronous dual-port static RAM with independent left/right ports, 12 ns max access time (commercial/industrial), LVTTL-compatible 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port via OPTL/OPTR pins. It enables simultaneous read/write to the same memory location in real-time signal processing systems.

For engineers reviewing the 70V657S12BCGI datasheet, 70V657S12BCGI pinout, 70V657S12BCGI application, or 70V657S12BCGI equivalent, this device supports master/slave cascading for 72-bit+ bus expansion, on-chip semaphore arbitration, JTAG IEEE 1149.1 compliance, and industrial temperature operation (–40°C to +85°C) in a 208-pin PQFP package.

Technical Context

The 70V657S12BCGI implements true dual-port SRAM architecture with fully asynchronous operation on both ports, allowing concurrent access without external synchronization logic. Its on-chip arbitration logic resolves contention using BUSY flag signaling and M/S configuration.

Each port features independent CE0/CE1 enables, R/W control, byte-enable lines (BE0–BE3) for 9-bit granularity, and separate OPT/VDDQ rails enabling mixed-voltage interfacing - e.g., left port at 3.3 V and right port at 2.5 V - while maintaining a unified 3.3 V core supply (VDD).

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	32K x 36 bits (1.152 Mbit); A16 and A15 are no-connects, limiting address space to 15 bits (32K depth)
Access Time	12 ns max (both commercial and industrial grades); guarantees deterministic latency for real-time DSP buffering
Supply Voltages	VDD = 3.3 V ±150 mV (core); VDDQL/VDDQR = 3.3 V ±150 mV or 2.5 V ±100 mV (I/O); independently configurable per port
Operating Temperature	–40°C to +85°C; qualified for industrial embedded systems requiring extended thermal reliability
Package	208-pin Plastic Quad Flatpack (PQFP); 28 mm × 28 mm × 3.5 mm body; lead-free (Green) compliant
JTAG Support	Fully compliant with IEEE 1149.1; includes TDI, TDO, TCK, TMS, TRST pins for boundary-scan testing and debug
Power Management	Four standby modes: ISB1 (both ports deselected, TTL inputs) = 75–100 mA max; ISB3 (full CMOS standby) = 3–6 mA max

Pinout & Package

208-pin PQFP package (DR208/DRG208); 28 mm × 28 mm × 3.5 mm body; 0.5 mm lead pitch; RoHS-compliant, Green-part qualified.

Pin/Terminal	Circuit Role	Design Meaning
A0L–A14L	Left port address inputs	15-bit address bus for left port; A15L/A16L are NC per datasheet Note 2
I/O0L–I/O35L	Left port bidirectional data I/O	36-bit data bus; BE0L–BE3L enable 9-bit byte writes independently
CE0L, CE1L	Left port chip enables	Dual CE logic: CE0L = VIH & CE1L = VIL enables port; allows depth expansion without glue logic
R/WL	Left port read/write control	Active-low write; high = read; controls direction of I/O0L–I/O35L during access
OEL	Left port output enable	Tri-states I/O0L–I/O35L when high; required for read operations
BE0L–BE3L	Left port byte enables	Four independent 9-bit enables (I/O0–8, 9–17, 18–26, 27–35); supports partial-word writes
SEML	Left port semaphore enable	Enables access to 8-bit semaphore register (addressed by A0L–A2L) for inter-port coordination
BUSYL	Left port busy flag	Output when M/S = VIH (Master); input when M/S = VIL (Slave); indicates arbitration conflict
INTL	Left port interrupt flag	Active-high totem-pole output; signals semaphore event or error condition to host controller
OPTL	Left port I/O voltage select	VIH → 3.3 V I/O levels & VDDQL = 3.3 V; VIL → 2.5 V I/O levels & VDDQL = 2.5 V
VDDQL	Left port I/O power supply	Must match OPTL setting: 3.3 V ±150 mV or 2.5 V ±100 mV; decoupling critical for signal integrity
VDD	Core power supply	3.3 V ±150 mV for internal logic and memory array; all VDD pins must be connected and decoupled
VSS	Ground reference	All VSS pins must be connected to common system ground; multiple pins reduce ground bounce
M/S	Master/Slave select	VIH = Master (BUSY output); VIL = Slave (BUSY input); determines arbitration role in cascaded systems
TCK, TMS, TDI, TDO, TRST	JTAG test interface	Supports IEEE 1149.1 boundary scan; enables production test and in-system debug without intrusive probing

Key Features

Feature	Design Value
True dual-port architecture	Simultaneous independent read/write to identical memory locations without collision or wait states
On-chip semaphore logic	Eight dedicated flags (A0–A2 addressed) shared across ports; eliminates need for external semaphores or software polling
Configurable I/O voltage per port	OPTL/OPTR pins allow left/right ports to operate at 3.3 V or 2.5 V independently - critical for mixed-voltage SoC interfacing
Master/Slave cascading support	Enables seamless 72-bit+ word width expansion using IDT70V659/58/57 family; no external logic required for depth/width scaling
Industrial-grade timing assurance	12 ns max access time guaranteed over –40°C to +85°C; validated across voltage and process corners for deterministic real-time use
Low-power standby modes	ISB3 full standby current as low as 3 mA (typ) enables energy-sensitive applications like portable test equipment

Applications

Telecom Line Card Buffering	Real-Time Digital Signal Processing
Use Scenario: High-throughput packet buffering between line-side PHY and switch fabric in carrier-grade Ethernet line cards. IC Role / Device Role / Timing Role: Dual-port SRAM acts as ping-pong buffer - one port accepts incoming frames while the other feeds processed packets to the MAC layer. Use Value: 12 ns access time ensures sub-microsecond latency for jitter-sensitive voice-over-IP traffic; BUSY arbitration prevents frame corruption during simultaneous access.	Use Scenario: Co-processing between FPGA-based FFT engine and ARM host processor in radar signal conditioning modules. IC Role / Device Role / Timing Role: Left port interfaces FPGA for streaming raw ADC samples; right port serves ARM for coefficient updates and result reads. Use Value: Independent 3.3 V/2.5 V I/O rails allow direct connection to 2.5 V FPGA I/O banks and 3.3 V ARM bus without level shifters.
Industrial Motion Controller Memory	Medical Imaging Data Pipeline
Use Scenario: Synchronized servo loop buffering in multi-axis CNC controllers where position feedback and command generation occur concurrently. IC Role / Device Role / Timing Role: Acts as shared memory between motion ASIC (left port) and safety monitor MCU (right port), coordinated via semaphore flags. Use Value: On-chip semaphore logic eliminates race conditions during parameter updates; industrial temp rating ensures reliability inside sealed enclosures.	Use Scenario: Real-time DICOM image reconstruction pipeline in ultrasound systems, where beamforming data flows into memory while post-processing reads out. IC Role / Device Role / Timing Role: Dual-port SRAM buffers time-critical echo data streams between custom ASIC and GPU-accelerated reconstruction engine. Use Value: 36-bit width matches native pixel packing; 12 ns access enables >80 MB/s sustained bandwidth needed for 4K cine-loop capture.

Telecom Line Card Buffering

Real-Time Digital Signal Processing

Use Scenario: High-throughput packet buffering between line-side PHY and switch fabric in carrier-grade Ethernet line cards.

IC Role / Device Role / Timing Role: Dual-port SRAM acts as ping-pong buffer - one port accepts incoming frames while the other feeds processed packets to the MAC layer.

Use Value: 12 ns access time ensures sub-microsecond latency for jitter-sensitive voice-over-IP traffic; BUSY arbitration prevents frame corruption during simultaneous access.

Use Scenario: Co-processing between FPGA-based FFT engine and ARM host processor in radar signal conditioning modules.

IC Role / Device Role / Timing Role: Left port interfaces FPGA for streaming raw ADC samples; right port serves ARM for coefficient updates and result reads.

Use Value: Independent 3.3 V/2.5 V I/O rails allow direct connection to 2.5 V FPGA I/O banks and 3.3 V ARM bus without level shifters.

Industrial Motion Controller Memory

Medical Imaging Data Pipeline

Use Scenario: Synchronized servo loop buffering in multi-axis CNC controllers where position feedback and command generation occur concurrently.

IC Role / Device Role / Timing Role: Acts as shared memory between motion ASIC (left port) and safety monitor MCU (right port), coordinated via semaphore flags.

Use Value: On-chip semaphore logic eliminates race conditions during parameter updates; industrial temp rating ensures reliability inside sealed enclosures.

Use Scenario: Real-time DICOM image reconstruction pipeline in ultrasound systems, where beamforming data flows into memory while post-processing reads out.

IC Role / Device Role / Timing Role: Dual-port SRAM buffers time-critical echo data streams between custom ASIC and GPU-accelerated reconstruction engine.

Use Value: 36-bit width matches native pixel packing; 12 ns access enables >80 MB/s sustained bandwidth needed for 4K cine-loop capture.

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 x 36, 12 ns, 3.3 V only (no 2.5 V I/O option); BGA package (165-ball); no JTAG support	Lacks per-port voltage selection and IEEE 1149.1 testability; requires PCB redesign for BGA footprint	Select if JTAG and mixed-voltage I/O are unnecessary and BGA layout is already committed.
AS7C33256P-12TCN	32K x 36, 12 ns, 3.3 V core/I/O; PQFP-208; no semaphore logic, no M/S cascade mode, no JTAG	Requires external arbitration logic for multi-processor access; no built-in inter-port coordination capability	Select only for cost-sensitive, single-controller applications where semaphore and cascade features are unused.

Compared with CY7C1362BV33-12BGXI and AS7C33256P-12TCN, the 70V657S12BCGI uniquely delivers per-port I/O voltage flexibility, integrated semaphore arbitration, and JTAG testability - all in the same 208-pin PQFP footprint - making it the only drop-in solution for industrial systems requiring robust inter-processor coordination and mixed-voltage interoperability.

Availability

70V657S12BCGI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, medical imaging, and real-time DSP applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 70V657S12BCGI 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, RF, and sensor solutions, now part of Renesas Electronics since 2019.

The IDT70V657 product line delivers high-speed asynchronous dual-port SRAMs optimized for real-time embedded systems requiring deterministic latency, inter-processor coordination, and industrial temperature resilience.

FAQ

What is the maximum operating frequency supported by the 70V657S12BCGI?

The 70V657S12BCGI does not operate on a clock signal - it is an asynchronous dual-port SRAM. Its performance is defined by access time: 12 ns maximum read/write cycle time (tRC/tWC), enabling effective throughput up to ~83 MHz in tightly controlled systems. Timing is governed by setup/hold relationships (e.g., tAS, tDH) rather than a system clock.

Does the 70V657S12BCGI support both 3.3 V and 2.5 V I/O on the same device?

Yes - the 70V657S12BCGI 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. This allows one port to interface with a 3.3 V microcontroller while the other connects to a 2.5 V FPGA, all while sharing a common 3.3 V core supply (VDD).

How does the BUSY signal function in master versus slave configuration for the 70V657S12BCGI?

When M/S = VIH, the 70V657S12BCGI operates as Master: BUSYL/BUSYR are totem-pole outputs that assert low during port-to-port contention. When M/S = VIL, it operates as Slave: BUSYL/BUSYR become inputs that must be driven low by the Master to inhibit writes. This enables hardware-enforced arbitration without software intervention.

Can the 70V657S12BCGI be used in a master/slave configuration with another 70V657S12BCGI device?

Yes - the 70V657S12BCGI supports cascaded master/slave operation using the M/S pin and BUSY signaling. One device is configured as Master (M/S = VIH), the other as Slave (M/S = VIL). The Master's BUSY output drives the Slave's BUSY input, enabling automatic write blocking during address conflicts - essential for building wider (e.g., 72-bit) memory systems.

What is the purpose of the semaphore feature in the 70V657S12BCGI, and how is it accessed?

The semaphore feature provides eight hardware-managed flags for inter-port synchronization. Accessed via SEM = VIL and CE = VIH (opposite of RAM access), with addresses A0–A2 selecting the flag. Reads return the flag state on all 36 I/O lines; writes use I/O0 to set/clear. This eliminates software polling and race conditions in multi-processor shared-memory designs.

70V657S12BCGI Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 256-LBGA

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:: 256-CABGA (17x17)

70V657S12BCGI FAQ

1.How can I place an order for 70V657S12BCGI through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V657S12BCGI 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 70V657S12BCGI reliable?

The price and inventory of 70V657S12BCGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V657S12BCGI is usually 5 days.

3.What payment methods are accepted for 70V657S12BCGI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V657S12BCGI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70V657S12BCGI?

70V657S12BCGI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V657S12BCGI 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 70V657S12BCGI?

For technical support, including 70V657S12BCGI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V657S12BCGI requirements.

6.How does Aetrix verify that 70V657S12BCGI is sourced from the original manufacturer or authorized distributors?

All 70V657S12BCGI 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 70V657S12BCGI meets industry standards.

7.What is the process for return or replacement of 70V657S12BCGI?

All 70V657S12BCGI units undergo pre-shipment inspection (PSI). If there is an issue with 70V657S12BCGI, 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 70V657S12BCGI part is unused and in its original packaging.

Return procedure for 70V657S12BCGI:

1.Submit a request within 90 days.

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

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