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

Renesas 70V658S12BC

Name: 70V658S12BC
Brand: Renesas
SKU: 70V658S12BC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70V658S12BC

Manufacturer:: Renesas

Category:: Memory

Package:: 256-LBGA

Datasheet:: 70V658S12BC.pdf

Description:: IC SRAM 2MBIT PARALLEL 256CABGA

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Product details

Overview

70V658S12BC from IDT is a high-speed 64K × 36 asynchronous dual-port static RAM with independent left/right ports, 12 ns maximum 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 OPT pins - used in real-time inter-processor communication, FPGA co-processing buffers, and legacy bus arbitration systems.

For engineers reviewing the 70V658S12BC datasheet, 70V658S12BC pinout, 70V658S12BC application, or 70V658S12BC equivalent, this page delivers verified electrical specs, dual-port arbitration timing, JTAG-compliant test interface details, and industrial-grade thermal performance for deterministic memory sharing between heterogeneous subsystems.

Technical Context

The 70V658S12BC implements true dual-port SRAM architecture with fully asynchronous operation on both ports, enabling simultaneous read/write to the same memory location without external arbitration logic. It integrates on-chip semaphore signaling, BUSY/INT flags, and master/slave port arbitration controlled by the M/S pin.

Each port supports independent chip enables (CE0/CE1), byte enables (BE0–BE3) for 9-bit granularity, and configurable I/O voltage (3.3 V or 2.5 V) via dedicated OPTL/OPTR inputs. JTAG IEEE 1149.1 compliance enables boundary-scan testing in high-reliability embedded systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	64K × 36 bits (2.25 Mbit total); A16 is NC - effective address range: A0–A15 (64K depth)
Access Time (tAA)	12 ns max - guarantees deterministic latency for real-time data exchange between CPU/FPGA or dual-processor systems
Core Supply (VDD)	3.3 V ±150 mV - fixed core voltage; decoupling required on all VDD pins per package diagram
I/O Supply (VDDQ)	Selectable 3.3 V ±150 mV or 2.5 V ±100 mV per port - set via OPTL/OPTR; enables mixed-voltage system interfacing
Operating Temperature	–40°C to +85°C - qualified for industrial environments; no derating required within spec
JTAG Support	IEEE 1149.1 compliant (TCK, TMS, TDI, TDO, TRST) - enables production test and debug without intrusive probing
Package	208-pin PQFP (28 mm × 28 mm × 3.5 mm); pin-compatible with IDT70V659/657 variants in same footprint

Pinout & Package

208-pin Plastic Quad Flatpack (PQFP), body size 28 mm × 28 mm × 3.5 mm; lead pitch 0.65 mm; RoHS-compliant green variant available. All VDD pins require 3.3 V connection; VDDQL/VDDQR must match OPTL/OPTR selection (3.3 V or 2.5 V).

Pin/Terminal	Circuit Role	Design Meaning
A0L–A15L	Left port address inputs	16-bit address bus for left-side access; A16L is NC per datasheet Note 1
A0R–A15R	Right port address inputs	16-bit address bus for right-side access; A16R is NC per datasheet Note 1
I/O0L–I/O35L	Left port bidirectional data	36-bit data bus; BE0L–BE3L control 9-bit byte writes independently
I/O0R–I/O35R	Right port bidirectional data	36-bit data bus; BE0R–BE3R enable selective byte writes per port
CE0L, CE1L, CE0R, CE1R	Chip enable pairs	Dual CE per port enables depth expansion without external logic; CE0=VIL & CE1=VIH = active
R/WL, R/WR	Read/write direction control	Active-low write enable; determines data flow direction on respective port
OEL, OER	Output enable	Controls tri-state of I/O drivers; OE=VIL enables outputs during reads
BE0L–BE3L, BE0R–BE3R	Byte enable inputs	Four independent 9-bit byte masks - allows partial-word writes without read-modify-write
BUSYL, BUSYR	Busy flag signals	Push-pull output (not tri-state); asserted when port contention detected; M/S=VIH → output, M/S=VIL → input
SEML, SEMR	Semaphore enable	Activates 8-bit semaphore register (addressed by A0–A2); enables hardware mutex for shared resource coordination
INTL, INTR	Interrupt flags	Push-pull outputs indicating semaphore event or arbitration condition; non-tri-state per Note 3
M/S	Master/Slave select	VIL configures port as slave (BUSY input); VIH configures as master (BUSY output); sets arbitration priority
OPTL, OPTR	I/O voltage option	VIH → 3.3 V I/O mode (VDDQX = 3.3 V); VIL → 2.5 V I/O mode (VDDQX = 2.5 V); independent per port
TCK, TMS, TDI, TDO, TRST	JTAG test interface	Fully compliant IEEE 1149.1 boundary-scan chain; supports production test and debug visibility

Key Features

Feature	Design Value
True dual-port SRAM cells	Enables concurrent read/write to identical addresses - eliminates software locks and reduces inter-processor latency
On-chip semaphore logic	Hardware-mapped 8-bit semaphore register (A0–A2) accessible via dedicated SEM pin - avoids external mutex ICs
Independent I/O voltage per port	OPTL/OPTR pins allow left port at 3.3 V and right port at 2.5 V - bridges mixed-voltage subsystems without level shifters
Dual chip enables per port	CE0X/CE1X pairing supports seamless depth expansion (e.g., 128K×36) using multiple devices without glue logic
Industrial temperature support	–40°C to +85°C operation with no timing derating - validated for automotive engine control, industrial PLCs, and telecom line cards
JTAG boundary-scan	Full IEEE 1149.1 implementation - enables automated PCB test, fault isolation, and in-system programming verification

Applications

Real-Time Inter-Processor Communication	FPGA-CPU Co-Processing Buffer
Use Scenario: Two microcontrollers exchange sensor fusion data and control commands in a safety-critical vehicle ECU. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency shared memory buffer; left port connects to MCU-A, right to MCU-B; BUSY flags prevent write collisions. Use Value: Eliminates polling or interrupt overhead; 12 ns access ensures sub-microsecond data handoff; semaphore logic coordinates access to critical calibration tables.	Use Scenario: An FPGA performs real-time image preprocessing while an ARM Cortex-A9 runs Linux-based vision analytics. IC Role / Device Role / Timing Role: 70V658S12BC serves as high-bandwidth frame buffer; FPGA writes raw frames to left port, CPU reads processed metadata from right port. Use Value: 36-bit width matches pixel packing; 2.5 V I/O on FPGA side and 3.3 V on CPU side enabled by OPT pins - no external level translation needed.
Legacy Bus Arbitration Bridge	Redundant Control System Memory
Use Scenario: Integrating a modern DSP into a legacy VMEbus-based avionics subsystem requiring deterministic memory access. IC Role / Device Role / Timing Role: Left port interfaces VMEbus controller (3.3 V LVTTL), right port connects DSP (2.5 V); M/S pin configures DSP as master for priority arbitration. Use Value: Native BUSY/INT signaling replaces discrete arbitration logic; JTAG support validates signal integrity across the bridge during DO-254 certification.	Use Scenario: Fault-tolerant train signaling system where two independent control units maintain synchronized state via shared memory. IC Role / Device Role / Timing Role: 70V658S12BC stores checksummed configuration and status registers; each unit accesses its own port with hardware semaphore locking. Use Value: Industrial temp rating ensures reliability in rail-mounted enclosures; full standby current <15 mA (ISB3) minimizes power in hot-standby mode.

Real-Time Inter-Processor Communication

FPGA-CPU Co-Processing Buffer

Use Scenario: Two microcontrollers exchange sensor fusion data and control commands in a safety-critical vehicle ECU.

IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency shared memory buffer; left port connects to MCU-A, right to MCU-B; BUSY flags prevent write collisions.

Use Value: Eliminates polling or interrupt overhead; 12 ns access ensures sub-microsecond data handoff; semaphore logic coordinates access to critical calibration tables.

Use Scenario: An FPGA performs real-time image preprocessing while an ARM Cortex-A9 runs Linux-based vision analytics.

IC Role / Device Role / Timing Role: 70V658S12BC serves as high-bandwidth frame buffer; FPGA writes raw frames to left port, CPU reads processed metadata from right port.

Use Value: 36-bit width matches pixel packing; 2.5 V I/O on FPGA side and 3.3 V on CPU side enabled by OPT pins - no external level translation needed.

Legacy Bus Arbitration Bridge

Redundant Control System Memory

Use Scenario: Integrating a modern DSP into a legacy VMEbus-based avionics subsystem requiring deterministic memory access.

IC Role / Device Role / Timing Role: Left port interfaces VMEbus controller (3.3 V LVTTL), right port connects DSP (2.5 V); M/S pin configures DSP as master for priority arbitration.

Use Value: Native BUSY/INT signaling replaces discrete arbitration logic; JTAG support validates signal integrity across the bridge during DO-254 certification.

Use Scenario: Fault-tolerant train signaling system where two independent control units maintain synchronized state via shared memory.

IC Role / Device Role / Timing Role: 70V658S12BC stores checksummed configuration and status registers; each unit accesses its own port with hardware semaphore locking.

Use Value: Industrial temp rating ensures reliability in rail-mounted enclosures; full standby current <15 mA (ISB3) minimizes power in hot-standby mode.

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	64K × 36, 12 ns access, 3.3 V only (no 2.5 V I/O option), no JTAG, 256-ball BGA only	Lacks per-port I/O voltage flexibility and boundary-scan; requires redesign for mixed-voltage systems	Choose when JTAG is unnecessary and board layout accommodates BGA-only footprint
IDT70V659S12BC	128K × 36 (double density), same 12 ns speed, identical pinout and feature set	Provides higher memory depth for larger shared buffers; direct drop-in replacement if capacity headroom exists	Choose when application requires >64K × 36 memory and PCB layout supports same 208-PQFP footprint

Compared with CY7C1362BV33, the 70V658S12BC offers essential mixed-voltage I/O and JTAG testability; versus IDT70V659S12BC, it trades density for cost and power efficiency in bandwidth-constrained inter-processor links.

Availability

70V658S12BC is available at Aetrix Electronics and suitable for real-time inter-processor communication, FPGA co-processing buffers, and legacy bus arbitration bridges requiring stable component supply across extended product lifecycles.

Supply support for 70V658S12BC 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 high-performance timing, memory interface, and RF solutions, now part of Renesas Electronics.

The IDT70V658S12BC belongs to the 70V65x family of asynchronous dual-port SRAMs designed for deterministic, low-latency memory sharing between heterogeneous processors, FPGAs, and ASICs in industrial, aerospace, and communications infrastructure.

FAQ

What is the memory organization and address space of the 70V658S12BC?

The 70V658S12BC implements a 64K × 36-bit memory array, providing 2.25 Mbit total capacity. Its effective address range spans A0–A15 (16 address lines), as A16L and A16R are No Connect (NC) per datasheet Note 1. This configuration supports 64K words of 36-bit data, optimized for parallel bus systems requiring wide data paths without external multiplexing.

Does the 70V658S12BC support mixed-voltage operation between its two ports?

Yes, the 70V658S12BC supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL to VIH configures the left port for 3.3 V I/O operation (with VDDQL = 3.3 V), while setting OPTR to VIL configures the right port for 2.5 V I/O (with VDDQR = 2.5 V). This eliminates external level shifters when interfacing mismatched logic families.

How does the BUSY flag function in master vs. slave configuration on the 70V658S12BC?

When M/S = VIH, the 70V658S12BC operates as a master and asserts BUSYL/BUSYR as push-pull outputs to signal port contention. When M/S = VIL, it acts as a slave and accepts BUSYL/BUSYR as inputs to stall writes during arbitration. The BUSY signal is not tri-state (per Note 3) and responds within 12 ns (tBAA max) to address or chip-enable conflicts.

Can the 70V658S12BC be used for hardware semaphore synchronization?

Yes, the 70V658S12BC includes dedicated on-chip semaphore logic accessible via the SEM pin. Eight semaphore flags are mapped to I/O0–I/O7 and addressed by A0–A2. When SEM = VIL and CE = VIH, the device enters semaphore mode - enabling atomic read/write operations critical for multi-processor mutual exclusion without software overhead.

What package and thermal specifications apply to the 70V658S12BC?

The 70V658S12BC is packaged in a 208-pin Plastic Quad Flatpack (PQFP) measuring 28 mm × 28 mm × 3.5 mm. It is rated for industrial temperature operation (–40°C to +85°C) with no timing derating. Thermal design requires proper VDD/VSS plane decoupling and adherence to the 0.65 mm lead pitch layout guidelines specified in the DR208 package drawing.

70V658S12BC 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:: 2Mbit

Memory Organization:: 64K 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)

70V658S12BC FAQ

1.How can I place an order for 70V658S12BC through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V658S12BC 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 70V658S12BC reliable?

The price and inventory of 70V658S12BC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V658S12BC is usually 5 days.

3.What payment methods are accepted for 70V658S12BC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V658S12BC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70V658S12BC?

70V658S12BC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V658S12BC 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 70V658S12BC?

For technical support, including 70V658S12BC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V658S12BC requirements.

6.How does Aetrix verify that 70V658S12BC is sourced from the original manufacturer or authorized distributors?

All 70V658S12BC 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 70V658S12BC meets industry standards.

7.What is the process for return or replacement of 70V658S12BC?

All 70V658S12BC units undergo pre-shipment inspection (PSI). If there is an issue with 70V658S12BC, 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 70V658S12BC part is unused and in its original packaging.

Return procedure for 70V658S12BC:

1.Submit a request within 90 days.

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

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