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

Renesas 70V658S12BCI8

Name: 70V658S12BCI8
Brand: Renesas
SKU: 70V658S12BCI8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70V658S12BCI8

Manufacturer:: Renesas

Category:: Memory

Package:: 256-LBGA

Datasheet:: 70V658S12BCI8.pdf

Description:: IC SRAM 2MBIT PARALLEL 256CABGA

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Product details

Overview

70V658S12BCI8 from IDT is a high-speed 64K × 36 asynchronous dual-port static RAM with true independent left/right ports, 12 ns maximum access time (industrial grade), LVTTL-compatible I/Os, and on-chip semaphore arbitration logic. It supports simultaneous read/write to the same memory location and is used in real-time interprocessor communication systems requiring deterministic latency and collision-free data exchange.

For engineers reviewing the 70V658S12BCI8 datasheet, 70V658S12BCI8 pinout, 70V658S12BCI8 application, or 70V658S12BCI8 equivalent, this device is selected for dual-ported memory subsystems where port arbitration, JTAG debug support, and flexible 2.5V/3.3V I/O voltage selection per port are critical design requirements.

Technical Context

The 70V658S12BCI8 implements fully asynchronous operation on both ports with separate address, control, and bidirectional I/O buses. Its internal arbitration logic resolves contention via BUSY flag signaling and hardware semaphore registers accessible through A0–A2 addressing.

Each port features independent chip enables (CE0/CE1), byte enables (BE0–BE3), read/write control (R/W), output enable (OE), and master/slave configuration (M/S). The OPTL/OPTR pins configure I/O voltage (2.5V or 3.3V) independently per port, while VDD remains fixed at 3.3V for core logic.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	64K × 36 bits (2.25 Mbit total, 36-bit wide dual-port interface)
Access Time (tAA)	12 ns max - guarantees deterministic read latency under industrial temperature (−40°C to +85°C)
Supply Voltages	VDD = 3.3 V ±150 mV (core); VDDQL/VDDQR = 3.3 V ±150 mV or 2.5 V ±100 mV (I/O, selectable per port)
Operating Temperature	−40°C to +85°C - qualified for industrial-grade embedded and communications equipment
Port Arbitration	Hardware semaphore logic with SEM/INT/BUSY flags - eliminates need for external arbitration logic in multi-processor designs
JTAG Support	IEEE 1149.1 compliant (TCK, TMS, TDI, TDO, TRST) - enables boundary-scan testing and in-system debug
Power Management	Four standby modes (ISB1–ISB4) down to 3 mA - reduces power in idle or partial-active configurations

Pinout & Package

70V658S12BCI8 is packaged in a 208-pin Plastic Quad Flatpack (PQFP), body size ≈28 mm × 28 mm × 3.5 mm, with 0.5 mm lead pitch. All VDD pins require connection to 3.3 V; VDDQL/VDDQR must match OPTL/OPTR settings (3.3 V if OPT = VDD, 2.5 V if OPT = VSS).

Pin/Terminal	Circuit Role	Design Meaning
A0L–A16L, A0R–A16R	Address Inputs (Left/Right)	A16 is NC for 70V658; valid address range is A0–A15 (64K depth)
I/O0L–I/O35L, I/O0R–I/O35R	Bidirectional Data Bus (Left/Right)	36-bit parallel interface per port; byte-enabled (BE0–BE3) for 9-bit granularity
CE0L/CE1L, CE0R/CE1R	Chip Enable Inputs	Dual CE per port enables depth expansion without external logic
R/WL/R/WR, OEL/OER	Read/Write & Output Enable	Asynchronous control: R/W determines direction; OE gates output drivers
BE0L–BE3L, BE0R–BE3R	Byte Enable Inputs	Selects active 9-bit bytes (I/O0–8, 9–17, 18–26, 27–35) during read/write
SEML/SEMR, INTL/INTR, BUSYL/BUSYR	Semaphore/Interrupt/Busy Flags	Active-high totem-pole outputs; BUSY is output when M/S = VIH (Master), input when M/S = VIL (Slave)
M/S	Master/Slave Select	Configures BUSY behavior: VIH → BUSY output (Master), VIL → BUSY input (Slave)
OPTL/OPTR	I/O Voltage Select	VIH → 3.3 V I/O levels; VIL → 2.5 V I/O levels; sets required VDDQX supply voltage

Key Features

Feature	Design Value
True Dual-Port Architecture	Enables simultaneous, independent read/write access to identical memory locations - essential for lock-free interprocessor messaging
On-Chip Semaphore Logic	Eight hardware semaphore flags (addressed by A0–A2) shared across both ports - eliminates software polling or external semaphores
Independent I/O Voltage Control	OPTL/OPTR pins allow left/right ports to operate at 2.5 V or 3.3 V concurrently - simplifies interfacing with mixed-voltage SoCs or FPGAs
Low-Power Standby Modes	ISB3 mode draws only 3–6 mA (typ.) with both ports fully deselected - ideal for power-constrained industrial gateways
JTAG Boundary-Scan Support	Fully compliant IEEE 1149.1 test interface with dedicated TAP controller - enables production test and field diagnostics without additional hardware

Applications

Real-Time Interprocessor Communication	Digital Signal Processing Subsystem
Use Scenario: Two DSPs exchange filter coefficients and status flags in a radar signal chain with sub-microsecond latency requirements. IC Role / Device Role / Timing Role: Shared memory buffer with hardware arbitration ensures deterministic write-read handshaking without CPU intervention. Use Value: Eliminates bus contention delays; 12 ns tAA and 5 ns tSOP semaphore update guarantee cycle-accurate synchronization between processing stages.	Use Scenario: An FPGA-based digital downconverter shares IQ sample buffers with an ARM host processor for real-time spectrum analysis. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-wait-state frame buffer; left port connects to FPGA fabric, right port to ARM AXI bus via bridge. Use Value: Independent 2.5 V/3.3 V I/O per port allows direct interface to 2.5 V FPGA I/O banks and 3.3 V ARM peripheral bus - no level shifters required.
Industrial Motion Controller	Avionics Data Acquisition Unit
Use Scenario: PLC CPU and servo motion engine coordinate trajectory updates and encoder feedback using shared memory with priority arbitration. IC Role / Device Role / Timing Role: Master/Slave configuration with BUSY flag enforces strict write ordering; semaphore flags manage resource locking. Use Value: Hardware arbitration prevents race conditions during simultaneous access; −40°C to +85°C rating ensures reliability in motor control enclosures.	Use Scenario: Flight data recorder captures sensor streams from multiple ADCs and forwards validated packets to a safety-critical microcontroller. IC Role / Device Role / Timing Role: Left port receives burst ADC data; right port feeds verified frames to MCU - isolated timing domains prevent interference. Use Value: JTAG support enables in-flight boundary-scan verification of memory integrity; ISB4 standby mode reduces power during non-recording intervals.

Real-Time Interprocessor Communication

Digital Signal Processing Subsystem

Use Scenario: Two DSPs exchange filter coefficients and status flags in a radar signal chain with sub-microsecond latency requirements.

IC Role / Device Role / Timing Role: Shared memory buffer with hardware arbitration ensures deterministic write-read handshaking without CPU intervention.

Use Value: Eliminates bus contention delays; 12 ns tAA and 5 ns tSOP semaphore update guarantee cycle-accurate synchronization between processing stages.

Use Scenario: An FPGA-based digital downconverter shares IQ sample buffers with an ARM host processor for real-time spectrum analysis.

IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-wait-state frame buffer; left port connects to FPGA fabric, right port to ARM AXI bus via bridge.

Use Value: Independent 2.5 V/3.3 V I/O per port allows direct interface to 2.5 V FPGA I/O banks and 3.3 V ARM peripheral bus - no level shifters required.

Industrial Motion Controller

Avionics Data Acquisition Unit

Use Scenario: PLC CPU and servo motion engine coordinate trajectory updates and encoder feedback using shared memory with priority arbitration.

IC Role / Device Role / Timing Role: Master/Slave configuration with BUSY flag enforces strict write ordering; semaphore flags manage resource locking.

Use Value: Hardware arbitration prevents race conditions during simultaneous access; −40°C to +85°C rating ensures reliability in motor control enclosures.

Use Scenario: Flight data recorder captures sensor streams from multiple ADCs and forwards validated packets to a safety-critical microcontroller.

IC Role / Device Role / Timing Role: Left port receives burst ADC data; right port feeds verified frames to MCU - isolated timing domains prevent interference.

Use Value: JTAG support enables in-flight boundary-scan verification of memory integrity; ISB4 standby mode reduces power during non-recording intervals.

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 CY7C1365KV18	72-bit bus width (vs. 36-bit), 15 ns access, 256-ball BGA only - no PQFP option	Targets wider data paths (e.g., DDR controller interfaces); lacks independent I/O voltage per port	Select when system requires >36-bit data width and board space permits BGA; verify BUSY arbitration compatibility
Renesas R1EX24064AS	64K × 16 organization, 15 ns access, 100-pin TQFP - narrower bus, no JTAG, no semaphore logic	Suitable for simpler dual-CPU systems without hardware locking; lower pin count reduces layout complexity	Choose for cost-sensitive industrial controllers where software-managed semaphores suffice and 16-bit data path is acceptable

Compared with CY7C1365KV18 and R1EX24064AS, the 70V658S12BCI8 uniquely delivers 36-bit dual-port width with per-port I/O voltage flexibility, integrated semaphore registers, and JTAG - making it optimal for complex, mixed-voltage, real-time interprocessor architectures where deterministic arbitration is mandatory.

Availability

70V658S12BCI8 is available at Aetrix Electronics and suitable for real-time interprocessor communication, digital signal processing subsystems, industrial motion control, avionics data acquisition, and FPGA co-processing applications requiring stable component supply and long-term industrial temperature support.

Supply support for 70V658S12BCI8 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 semiconductor company specializing in timing, memory interface, RF, and high-performance interconnect solutions, now part of Renesas Electronics.

The 70V658S12BCI8 belongs to IDT's high-speed asynchronous dual-port SRAM family, designed specifically for deterministic, low-latency interprocessor communication in industrial, aerospace, and telecom infrastructure equipment.

FAQ

What is the memory capacity and organization of the 70V658S12BCI8?

The 70V658S12BCI8 provides 64K × 36 bits (2.25 Mbit) of true dual-port static RAM. It supports independent 36-bit-wide access on left and right ports, with address lines A0–A15 active (A16 is no-connect). This configuration enables high-bandwidth data exchange between two asynchronous masters without bus contention.

Does the 70V658S12BCI8 support both 2.5 V and 3.3 V I/O interfaces simultaneously?

Yes - the 70V658S12BCI8 supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL = VDD configures the left port for 3.3 V I/O levels (requiring VDDQL = 3.3 V), while OPTR = VSS configures the right port for 2.5 V levels (requiring VDDQR = 2.5 V). This enables seamless interfacing with mixed-voltage SoCs or FPGAs.

How does hardware semaphore arbitration work on the 70V658S12BCI8?

The 70V658S12BCI8 integrates eight hardware semaphore flags accessible via A0–A2 addressing on either port. When SEM = VIL and CE = VIH, writes to I/O0 set the flag; reads return the flag state across all I/O lines. This eliminates software polling and ensures atomic resource locking between processors - a key capability confirmed in the functional block diagram and Truth Table II.

What is the significance of the "S12" suffix in 70V658S12BCI8?

The "S12" denotes the industrial-grade speed grade: 12 ns maximum access time (tAA) over the full −40°C to +85°C temperature range. This distinguishes it from commercial-grade variants (e.g., S10) and confirms guaranteed timing performance in harsh environments - a specification explicitly listed in Table 12 of the datasheet.

Can the 70V658S12BCI8 be used in Master/Slave configurations for wider memory expansion?

Yes - the M/S pin configures BUSY behavior: as Master (M/S = VIH), BUSY is an output flag indicating port contention; as Slave (M/S = VIL), BUSY is an input that halts writes until cleared. This enables cascaded configurations where one device arbitrates access for multiple 70V658S12BCI8 units - a capability documented in the "IDT70V659/58/57 easily expands data bus width" feature statement.

70V658S12BCI8 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 256-LBGA

Packaging:: Tape & Reel (TR)

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:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 256-CABGA (17x17)

70V658S12BCI8 FAQ

1.How can I place an order for 70V658S12BCI8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V658S12BCI8 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 70V658S12BCI8 reliable?

The price and inventory of 70V658S12BCI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V658S12BCI8 is usually 5 days.

3.What payment methods are accepted for 70V658S12BCI8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V658S12BCI8 transactions.

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4.How is shipping managed for 70V658S12BCI8?

70V658S12BCI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V658S12BCI8 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 70V658S12BCI8?

For technical support, including 70V658S12BCI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V658S12BCI8 requirements.

6.How does Aetrix verify that 70V658S12BCI8 is sourced from the original manufacturer or authorized distributors?

All 70V658S12BCI8 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 70V658S12BCI8 meets industry standards.

7.What is the process for return or replacement of 70V658S12BCI8?

All 70V658S12BCI8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V658S12BCI8, 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 70V658S12BCI8 part is unused and in its original packaging.

Return procedure for 70V658S12BCI8:

1.Submit a request within 90 days.

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

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