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

Renesas 70V639S10BF8

Name: 70V639S10BF8
Brand: Renesas
SKU: 70V639S10BF8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70V639S10BF8

Manufacturer:: Renesas

Category:: Memory

Package:: 208-LFBGA

Datasheet:: 70V639S10BF8.pdf

Description:: IC SRAM 2.25MBIT PAR 208CABGA

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Product details

Overview

70V639S10BF8 from Integrated Device Technology is a high-speed 128K × 18 asynchronous dual-port static RAM with fully independent left/right ports, 10 ns max read cycle time (commercial grade), 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 access to the same memory location in systems requiring real-time inter-processor communication, such as telecom line cards and industrial PLCs.

For engineers reviewing the 70V639S10BF8 datasheet, 70V639S10BF8 pinout, 70V639S10BF8 application, or 70V639S10BF8 equivalent, this device supports true dual-port arbitration, on-chip semaphore logic, BUSY/INT flag signaling, and Master/Slave cascading for 36-bit+ memory expansion - critical for deterministic shared-memory designs without external glue logic.

Technical Context

The 70V639S10BF8 implements true dual-port SRAM cells with separate address, control, and bidirectional I/O buses for left (L) and right (R) ports, enabling concurrent read/write operations without contention-induced latency. Its arbitration logic resolves port conflicts via hardware BUSY flag assertion (M/S = VIH) or BUSY input (M/S = VIL), with tBDD ≤ 10 ns propagation delay from write completion to valid read data on the opposing port.

Each port supports independent I/O voltage selection (3.3 V or 2.5 V) through dedicated OPTL/OPTR pins and corresponding VDDQL/VDDQR supplies, while core logic operates at fixed 3.3 V (±150 mV). JTAG boundary-scan (IEEE 1149.1) is implemented but excluded on the 128-pin TQFP package - confirmed for this BF8 variant per datasheet note on PK128.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	128K × 18 bits (2,304 Kbit total); supports 36-bit+ expansion via Master/Slave cascading with M/S pin.
Access Time (tAA)	10 ns max (commercial grade); guarantees sub-100 MHz asynchronous interface timing without wait states.
Supply Voltages	VDD = 3.3 V ±150 mV (core); VDDQL/VDDQR = 3.3 V ±150 mV or 2.5 V ±100 mV (I/O per port, selected by OPTL/OPTR).
Operating Temperature	0°C to +70°C (commercial grade); validated for stable operation in telecom and industrial control enclosures.
Port Arbitration	Hardware-based BUSY flag with tBAA ≤ 10 ns; supports both address-match and CE-controlled arbitration modes.
On-Chip Semaphores	Full hardware semaphore logic with eight flags (A0–A2 addressed), tSAA ≤ 10 ns access, tSPS = 5 ns contention window.
Interrupt Logic	Dedicated INTL/INTR flags set/cleared via specific addresses (1FFFFh/1FFFEh); tINS/tINR ≤ 10 ns propagation.

Pinout & Package

70V639S10BF8 is packaged in a 128-pin Thin Quad Flatpack (TQFP), body size ≈ 14 mm × 20 mm × 1.4 mm, with 0.5 mm lead pitch. JTAG is not supported in this package per datasheet note.

Pin/Terminal	Circuit Role	Design Meaning
A0L–A16L / A0R–A16R	Address Inputs (Left/Right)	17-bit address bus per port; enables full 128K-word addressing independently on each side.
I/O0L–I/O17L / I/O0R–I/O17R	Bidirectional Data I/O (Left/Right)	18-bit parallel data path per port; supports byte-level access via UBL/LBL and UBR/LBR.
CE0L, CE1L / CE0R, CE1R	Chip Enable Pairs (Left/Right)	Dual CE per port allows depth expansion without external logic; CE0X = VIL & CE1X = VIH enables port X.
R/WL / R/WR	Read/Write Control (Left/Right)	Active-low signal controlling direction of I/O bus; low = write, high = read (when OE active).
OEL / OER	Output Enable (Left/Right)	Controls tri-state of I/O drivers; low enables outputs, high places I/O in high-impedance state.
UBL, LBL / UBR, LBR	Upper/Lower Byte Select (Left/Right)	Enables 9-bit byte access: UBL/LBL select I/O9–I/O17 and I/O0–I/O8 respectively on left port.
BUSYL / BUSYR	Busy Flag (Left/Right)	When M/S = VIH: BUSY is output indicating port contention; when M/S = VIL: BUSY is input for slave arbitration.
SEML / SEMR	Semaphore Enable (Left/Right)	Activates semaphore register access mode; required with CE = VIH to read/write semaphore flags.
INTL / INTR	Interrupt Flag (Left/Right)	Open-drain (non-tri-state totem-pole) output; asserted low to signal interrupt event to host processor.
M/S	Master/Slave Select	VIH configures device as Master (BUSY output); VIL configures as Slave (BUSY input); enables multi-device synchronization.
OPTL / OPTR	I/O Voltage Option (Left/Right)	VIH selects 3.3 V I/O levels (VDDQX = 3.3 V); VIL selects 2.5 V I/O levels (VDDQX = 2.5 V); independent per port.
VDD, VDDQL, VDDQR	Power Supplies	VDD = 3.3 V core supply; VDDQL/VDDQR = I/O supply matching OPTL/OPTR setting; all must be decoupled locally.
VSS	Ground	All VSS pins must be connected to common system ground plane; multiple pins reduce ground bounce in high-speed operation.

Key Features

Feature	Design Value
True Dual-Port Architecture	Simultaneous independent read/write access to identical memory locations without arbitration delay or external logic.
Per-Port I/O Voltage Flexibility	Independent 3.3 V or 2.5 V I/O operation per port via OPTL/OPTR, enabling mixed-voltage system interfacing.
Hardware Semaphore Support	Eight on-chip semaphore flags with dedicated address space (A0–A2) and 5 ns contention window (tSPS) for lock-free IPC.
Master/Slave Cascading	M/S pin enables seamless 36-bit+ word-width expansion using multiple 70V639S devices without external decode logic.
Dual Chip Enable Per Port	CE0X/CE1X pair allows depth expansion (e.g., 256K×18) using standard address decoding, eliminating gate-count overhead.
Low-Power Standby Modes	ISB3 = 3 mA typical full standby (CMOS inputs); ISB1 = 340 mA typical dynamic operation (both ports active, fMAX).

Applications

Telecom Line Card Buffering	Industrial PLC Shared Memory
Use Scenario: Real-time packet buffering between DSP and network processor in OC-48 line cards. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency shared memory buffer; left port interfaces DSP (2.5 V), right port interfaces FPGA (3.3 V). Use Value: Eliminates FIFO handshaking overhead; 10 ns access ensures deterministic <100 ns inter-processor message latency.	Use Scenario: Coordinating motion control tasks between two microcontrollers in a CNC machine controller. IC Role / Device Role / Timing Role: Shared memory hub with hardware semaphores for resource locking; M/S configured for master-slave arbitration. Use Value: Prevents race conditions during joint axis updates; tSPS = 5 ns ensures sub-cycle lock acquisition in 20 MHz control loops.
Automotive ADAS Sensor Fusion	Medical Imaging Data Pipeline
Use Scenario: Synchronizing radar and camera preprocessing units in a Level 3 autonomous driving ECU. IC Role / Device Role / Timing Role: Asynchronous memory bridge with BUSY-flag arbitration; left port handles radar data (3.3 V), right port feeds camera pipeline (2.5 V). Use Value: Guarantees atomic sensor data exchange under variable load; tBDD ≤ 10 ns prevents frame misalignment during burst transfers.	Use Scenario: High-throughput DICOM image reconstruction pipeline in MRI systems requiring parallel CPU/GPU access. IC Role / Device Role / Timing Role: Dual-port frame buffer with INTL/INTR signaling; left port serves CPU (3.3 V), right port serves GPU DMA engine (3.3 V). Use Value: Enables lock-free pixel block transfer; interrupt-driven completion avoids polling, reducing CPU utilization by >40%.

Telecom Line Card Buffering

Industrial PLC Shared Memory

Use Scenario: Real-time packet buffering between DSP and network processor in OC-48 line cards.

IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency shared memory buffer; left port interfaces DSP (2.5 V), right port interfaces FPGA (3.3 V).

Use Value: Eliminates FIFO handshaking overhead; 10 ns access ensures deterministic <100 ns inter-processor message latency.

Use Scenario: Coordinating motion control tasks between two microcontrollers in a CNC machine controller.

IC Role / Device Role / Timing Role: Shared memory hub with hardware semaphores for resource locking; M/S configured for master-slave arbitration.

Use Value: Prevents race conditions during joint axis updates; tSPS = 5 ns ensures sub-cycle lock acquisition in 20 MHz control loops.

Automotive ADAS Sensor Fusion

Medical Imaging Data Pipeline

Use Scenario: Synchronizing radar and camera preprocessing units in a Level 3 autonomous driving ECU.

IC Role / Device Role / Timing Role: Asynchronous memory bridge with BUSY-flag arbitration; left port handles radar data (3.3 V), right port feeds camera pipeline (2.5 V).

Use Value: Guarantees atomic sensor data exchange under variable load; tBDD ≤ 10 ns prevents frame misalignment during burst transfers.

Use Scenario: High-throughput DICOM image reconstruction pipeline in MRI systems requiring parallel CPU/GPU access.

IC Role / Device Role / Timing Role: Dual-port frame buffer with INTL/INTR signaling; left port serves CPU (3.3 V), right port serves GPU DMA engine (3.3 V).

Use Value: Enables lock-free pixel block transfer; interrupt-driven completion avoids polling, reducing CPU utilization by >40%.

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 CY7C1375D-100AXC	128K × 18, 100 MHz (10 ns), 3.3 V only I/O, no per-port voltage selection; lacks M/S cascading support.	Requires external logic for 36-bit expansion; limited to single-voltage systems; no hardware semaphore registers.	Select when system uses uniform 3.3 V I/O and does not require inter-device synchronization or semaphores.
Renesas R1EX24016AS0C	128K × 16, 15 ns access, 3.3 V core/I/O, integrated JTAG; smaller 100-pin TQFP; no BUSY arbitration or semaphore logic.	Lower pin count but reduced data width; no hardware arbitration - relies on software protocols for conflict resolution.	Select for cost-sensitive, lower-bandwidth applications where software-managed shared memory suffices.

Compared with CY7C1375D-100AXC and R1EX24016AS0C, the 70V639S10BF8 uniquely delivers per-port I/O voltage flexibility, hardware semaphore registers, and Master/Slave cascading - enabling deterministic, low-latency shared memory in heterogeneous voltage and multi-device architectures without firmware overhead.

Availability

70V639S10BF8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and automotive ADAS applications requiring stable component supply, long-term lifecycle support, and guaranteed commercial-grade performance.

Supply support for 70V639S10BF8 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a semiconductor company specializing in timing, memory interface, and RF power solutions for high-performance computing and communications systems.

The IDT70V639S product line was designed specifically for deterministic inter-processor communication in real-time embedded systems, emphasizing hardware arbitration, low-latency dual-port access, and flexible I/O voltage compatibility.

FAQ

What is the maximum operating frequency supported by the 70V639S10BF8?

The 70V639S10BF8 supports a 10 ns read cycle time (tRC), enabling reliable operation up to 100 MHz in commercial-grade applications. This is verified across temperature (0°C to +70°C) and supply (VDD = 3.3 V ±150 mV), with tAA ≤ 10 ns ensuring setup timing compliance without external wait-state insertion. The 70V639S10BF8 does not specify a clock input; it is fully asynchronous.

How does the M/S pin affect BUSY signal behavior in the 70V639S10BF8?

In the 70V639S10BF8, the M/S pin configures BUSY functionality: when M/S = VIH, BUSY is an output flag asserting during port contention; when M/S = VIL, BUSY becomes an input used by the device as a slave to accept arbitration signals from a master 70V639S10BF8. This dual-mode design enables flexible multi-device synchronization without external logic.

Can the left and right ports of the 70V639S10BF8 operate at different I/O voltages simultaneously?

Yes - the 70V639S10BF8 supports independent I/O voltage selection per port. OPTL sets left-port I/O voltage (3.3 V if VIH, 2.5 V if VIL), and OPTR sets right-port I/O voltage identically. VDDQL and VDDQR must be supplied at the corresponding levels. This allows the 70V639S10BF8 to bridge 2.5 V and 3.3 V subsystems within a single device.

What is the purpose of the semaphore function in the 70V639S10BF8, and how is it accessed?

The 70V639S10BF8 includes eight hardware semaphore flags for inter-processor synchronization. They are accessed by setting CE = VIH and SEM = VIL, then addressing A0–A2 (0–7) while reading/writing I/O0. tSAA ≤ 10 ns and tSPS = 5 ns ensure fast, deterministic lock acquisition - critical for real-time systems where software semaphores introduce unpredictable latency.

Is JTAG boundary-scan supported on the 70V639S10BF8 in its 128-pin TQFP package?

No - JTAG (IEEE 1149.1) is explicitly excluded from the 128-pin TQFP package (PK128) of the 70V639S10BF8, as stated in the datasheet note on page 3: "Due to the restricted number of pins, JTAG is not supported in the PK128 package." JTAG remains available only on the 208-ball and 256-ball BGA variants.

70V639S10BF8 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 208-LFBGA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Volatile

Memory Format:: SRAM

Technology:: SRAM - Dual Port, Asynchronous

Memory Size:: 2.25Mbit

Memory Organization:: 128K x 18

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 10ns

Access Time:: 10 ns

Voltage - Supply:: 3.15V ~ 3.45V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

70V639S10BF8 FAQ

1.How can I place an order for 70V639S10BF8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V639S10BF8 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 70V639S10BF8 reliable?

The price and inventory of 70V639S10BF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V639S10BF8 is usually 5 days.

3.What payment methods are accepted for 70V639S10BF8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V639S10BF8 transactions.

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4.How is shipping managed for 70V639S10BF8?

70V639S10BF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V639S10BF8 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 70V639S10BF8?

For technical support, including 70V639S10BF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V639S10BF8 requirements.

6.How does Aetrix verify that 70V639S10BF8 is sourced from the original manufacturer or authorized distributors?

All 70V639S10BF8 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 70V639S10BF8 meets industry standards.

7.What is the process for return or replacement of 70V639S10BF8?

All 70V639S10BF8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V639S10BF8, 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 70V639S10BF8 part is unused and in its original packaging.

Return procedure for 70V639S10BF8:

1.Submit a request within 90 days.

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

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