Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Renesas 70V639S12PRFI

Name: 70V639S12PRFI
Brand: Renesas
SKU: 70V639S12PRFI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 70V639S12PRFI

Manufacturer:: Renesas

Category:: Memory

Package:: 128-LQFP

Datasheet:: 70V639S12PRFI.pdf

Description:: IC SRAM 2.25MBIT PAR 128TQFP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,348

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

IDT70V639S12PRFI from Integrated Device Technology (IDT) is a high-speed, 128K × 18-bit asynchronous dual-port static RAM with independent left/right ports, 12 ns maximum access time, 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port-designed for real-time inter-processor communication in industrial control systems requiring deterministic latency and concurrent read/write access to shared memory.

For engineers reviewing the IDT70V639S12PRFI datasheet, IDT70V639S12PRFI pinout, IDT70V639S12PRFI application, or IDT70V639S12PRFI equivalent, key selection considerations include port arbitration timing (tAPS = 5 ns), BUSY flag behavior under Master/Slave configuration, dual-chip-enable depth expansion capability, and JTAG support exclusion in the 128-pin TQFP package.

Technical Context

The IDT70V639S12PRFI implements true dual-port SRAM architecture with fully independent address, data, and control paths per port-enabling simultaneous, asynchronous access to any memory location without internal contention. Its on-chip arbitration logic resolves port conflicts via hardware semaphore signaling and BUSY flag assertion based on address match or chip enable timing.

Each port supports independent I/O voltage selection (3.3 V or 2.5 V) via dedicated OPTL/OPTR pins, with separate VDDQL/VDDQR supplies. The device operates across –40°C to +85°C (industrial grade), features automatic power-down via CE0/CE1, and provides interrupt flag generation at fixed addresses (1FFFEh/1FFFFh) with programmable set/reset timing (tINS/tINR ≤ 12 ns).

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	128K × 18 bits (2,304 Kbit total); enables 36-bit+ word systems via MASTER/SLAVE cascading with M/S pin.
Access Time (max)	12 ns - guarantees deterministic read latency for real-time embedded control loops and FPGA co-processing.
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	–40°C to +85°C - qualified for industrial automation, motor drives, and ruggedized communications equipment.
Arbitration Timing	tAPS = 5 ns setup for priority resolution; tBDD ≤ 12 ns ensures valid data after BUSY deassertion in Master mode.
Power Consumption	ISB3 = 6 mA max (full standby, CMOS inputs); IDD = 490 mA max (both ports active, 12 ns version, industrial temp).
Package	128-pin TQFP (PK128), 14 mm × 20 mm body, 0.5 mm pitch - compatible with standard SMT reflow profiles.

Pinout & Package

Package: 128-pin Thin Quad Flatpack (PK128), RoHS-compliant, lead-free finish. Body dimensions: 14 mm × 20 mm × 1.4 mm.

Pin	Circuit Role	Design Meaning
A0L–A16L / A0R–A16R	Address Inputs (Left/Right)	17-bit address bus per port; supports full 128K addressing (2¹⁷ = 131,072 locations).
I/O0L–I/O17L / I/O0R–I/O17R	Bidirectional Data Bus (Left/Right)	18-bit parallel I/O per port; byte-selectable via UBL/LBL and UBR/LBR for 9-bit granularity.
CE0L, CE1L / CE0R, CE1R	Chip Enable Inputs (Left/Right)	Dual CE per port enables depth expansion without external logic; CE0L=VIH & CE1L=VIL disables left port.
R/WL / R/WR	Read/Write Control (Left/Right)	Active-low write enable; controls direction of data flow on respective I/O bus during access cycles.
OEL / OER	Output Enable (Left/Right)	Tri-states I/O outputs when high; required to avoid bus contention during writes or deselected states.
UBR, LBR / UBL, LBL	Upper/Lower Byte Select (Right/Left)	Enables 9-bit sub-word access: UBR+LBL = both bytes; UBR only = upper byte (I/O9R–I/O17R), etc.
BUSYL / BUSYR	Busy Flag (Left/Right)	Output when M/S = VIH (Master); input when M/S = VIL (Slave); asserts during port contention or write-to-read conflict.
M/S	Master/Slave Select	Configures BUSY as output (VIH) or input (VIL); determines arbitration role in multi-device MASTER/SLAVE configurations.
SEML / SEMR	Semaphore Enable (Left/Right)	Enables access to 8-bit semaphore register (addressed by A0–A2); used for inter-port synchronization.
INTL / INTR	Interrupt Flag (Left/Right)	Open-drain, non-tri-state output; set/cleared by writes to fixed addresses 1FFFEh (INTL) or 1FFFFh (INTR).
OPTL / OPTR	I/O Voltage Option (Left/Right)	Selects I/O voltage: VIH → 3.3 V operation (VDDQL/VDDQR = 3.3 V); VIL → 2.5 V operation (VDDQL/VDDQR = 2.5 V).
VDD, VDDQL, VDDQR, VSS	Power/Ground Terminals	VDD = 3.3 V core supply; VDDQL/VDDQR = per-port I/O supply; all VSS pins must be connected to system ground.

Key Features

Feature	Design Value
True Dual-Port Architecture	Enables simultaneous, independent read/write access to same memory location-eliminates software locks and reduces inter-processor latency.
Hardware Semaphore Logic	On-chip 8-bit semaphore register (A0–A2) with atomic read/write; prevents race conditions in multi-threaded or multi-core environments.
Configurable I/O Voltage Per Port	Independent 3.3 V/2.5 V I/O selection via OPTL/OPTR allows interfacing with mixed-voltage FPGAs, ASICs, or microcontrollers without level shifters.
Master/Slave Cascading Support	M/S pin configures device as Master (BUSY output) or Slave (BUSY input); enables seamless 36-bit+ memory expansion using multiple IDT70V639S devices.
Industrial Temperature Range	–40°C to +85°C operation with guaranteed 12 ns access time-validated for use in motor drives, PLCs, and outdoor telecom infrastructure.
Low-Power Standby Modes	Four standby modes: ISB3 = 6 mA max (full CMOS standby); ISB1 = 100 mA max (TTL-level disabled ports)-reduces system power in idle states.

Applications

Industrial Motion Control	FPGA Co-Processing Interface
Use Scenario: Real-time coordination between motion controller MCU and servo drive FPGA, sharing position/velocity commands and status feedback. IC Role / Device Role / Timing Role: Dual-port SRAM acts as low-latency, lock-free shared memory buffer; left port connects to MCU, right port to FPGA fabric. Use Value: 12 ns access time and hardware arbitration eliminate polling delays; BUSY flag ensures deterministic response to concurrent access attempts.	Use Scenario: High-bandwidth data exchange between Xilinx Zynq PS and PL domains, where ARM cores write sensor data and FPGA accelerates processing. IC Role / Device Role / Timing Role: Acts as synchronous bridge memory-PS writes via AXI interface (left port), PL reads via custom HDL logic (right port). Use Value: Independent 3.3 V/2.5 V I/O per port matches Zynq PS I/O banks (3.3 V) and PL bank voltages (2.5 V), avoiding external level translation.
Redundant Communication Controller	Real-Time Digital Signal Processing
Use Scenario: Dual-CPU failover system in railway signaling, where primary and backup CPUs maintain mirrored state in shared memory. IC Role / Device Role / Timing Role: Provides atomic, contention-free memory access for state mirroring; semaphores coordinate CPU handover sequences. Use Value: Hardware semaphore flags and interrupt generation (INTL/INTR) enable sub-microsecond CPU switchover detection and execution.	Use Scenario: Audio DSP subsystem in broadcast equipment, where one processor handles FFT analysis while another manages I/O buffering and compression. IC Role / Device Role / Timing Role: Serves as ping-pong buffer memory-left port streams incoming audio samples, right port feeds processed frames to DAC interface. Use Value: Asynchronous operation allows continuous streaming without pipeline stalls; 18-bit width supports 24-bit audio with header space.

Industrial Motion Control

FPGA Co-Processing Interface

Use Scenario: Real-time coordination between motion controller MCU and servo drive FPGA, sharing position/velocity commands and status feedback.

IC Role / Device Role / Timing Role: Dual-port SRAM acts as low-latency, lock-free shared memory buffer; left port connects to MCU, right port to FPGA fabric.

Use Value: 12 ns access time and hardware arbitration eliminate polling delays; BUSY flag ensures deterministic response to concurrent access attempts.

Use Scenario: High-bandwidth data exchange between Xilinx Zynq PS and PL domains, where ARM cores write sensor data and FPGA accelerates processing.

IC Role / Device Role / Timing Role: Acts as synchronous bridge memory-PS writes via AXI interface (left port), PL reads via custom HDL logic (right port).

Use Value: Independent 3.3 V/2.5 V I/O per port matches Zynq PS I/O banks (3.3 V) and PL bank voltages (2.5 V), avoiding external level translation.

Redundant Communication Controller

Real-Time Digital Signal Processing

Use Scenario: Dual-CPU failover system in railway signaling, where primary and backup CPUs maintain mirrored state in shared memory.

IC Role / Device Role / Timing Role: Provides atomic, contention-free memory access for state mirroring; semaphores coordinate CPU handover sequences.

Use Value: Hardware semaphore flags and interrupt generation (INTL/INTR) enable sub-microsecond CPU switchover detection and execution.

Use Scenario: Audio DSP subsystem in broadcast equipment, where one processor handles FFT analysis while another manages I/O buffering and compression.

IC Role / Device Role / Timing Role: Serves as ping-pong buffer memory-left port streams incoming audio samples, right port feeds processed frames to DAC interface.

Use Value: Asynchronous operation allows continuous streaming without pipeline stalls; 18-bit width supports 24-bit audio with header space.

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 CY7C028V-12ZXC	128K × 16 organization; 12 ns access; 3.3 V only (no 2.5 V I/O option); no M/S pin or built-in MASTER/SLAVE cascading logic.	Lacks per-port voltage select and hardware-based depth expansion-requires external logic for 36-bit+ systems.	Choose when 16-bit data width suffices and system uses uniform 3.3 V I/O; verify external arbitration if replacing IDT70V639S12PRFI in existing designs.
Renesas R1EX24016AS0C-12	128K × 18; 12 ns access; 3.3 V core/I/O; no semaphore/interrupt logic; no BUSY arbitration-relies on external controller for conflict resolution.	No on-chip semaphore or interrupt flags; requires FPGA or MCU firmware to manage inter-port synchronization.	Prefer for cost-sensitive applications where arbitration and semaphores are handled in software or external logic; not drop-in for IDT70V639S12PRFI's hardware-managed concurrency.

Compared with CY7C028V-12ZXC and R1EX24016AS0C-12, the IDT70V639S12PRFI delivers unique value through integrated per-port I/O voltage selection, MASTER/SLAVE cascading capability, and hardware semaphore/interrupt logic-reducing BOM count and firmware complexity in tightly coupled multi-processor systems.

Availability

IDT70V639S12PRFI is available at Aetrix Electronics and suitable for industrial motion control, FPGA co-processing interfaces, and redundant communication controllers requiring stable component supply across extended product lifecycles.

Supply support for IDT70V639S12PRFI 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 fabless semiconductor company specializing in timing, memory interface, RF, and sensor signal conditioning ICs for communications, computing, and industrial markets.

The IDT70V639S product line was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems-emphasizing hardware arbitration, flexible voltage interfacing, and industrial-grade reliability.

FAQ

What is the maximum operating temperature range for the IDT70V639S12PRFI?

The IDT70V639S12PRFI is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all electrical parameters including 12 ns access time, standby current (ISB3 ≤ 6 mA), and BUSY arbitration timing (tAPS = 5 ns). The device undergoes full characterization and screening per industrial-grade requirements.

Does the IDT70V639S12PRFI support JTAG boundary scan?

No, the IDT70V639S12PRFI does not support JTAG boundary scan. Although the device includes JTAG pins (TMS, TCK, TRST, TDI, TDO) in its 208-ball and 256-ball BGA variants, JTAG functionality is explicitly excluded from the 128-pin TQFP package (PK128) due to pin count limitations-as confirmed in the official datasheet footnote on page 1.

How does the M/S pin affect BUSY signal behavior on the IDT70V639S12PRFI?

When M/S = VIH, the IDT70V639S12PRFI operates as a Master: BUSYL and BUSYR become output signals that assert during port contention or write-to-read conflicts. When M/S = VIL, it operates as a Slave: BUSYL and BUSYR become inputs, allowing external arbitration from a Master device. This dual-role capability enables flexible system-level arbitration topologies.

Can the left and right ports of the IDT70V639S12PRFI operate at different I/O voltages?

Yes, the IDT70V639S12PRFI 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. Corresponding VDDQL and VDDQR supplies must match the selected levels. This allows direct interfacing with heterogeneous logic families-for example, 3.3 V MCU and 2.5 V FPGA-without external level shifters.

What is the purpose of the semaphore register in the IDT70V639S12PRFI?

The IDT70V639S12PRFI includes an 8-bit hardware semaphore register addressed by A0–A2. It enables atomic read-modify-write operations for inter-port synchronization-critical for preventing race conditions in multi-processor systems. Access is controlled via SEM and CE pins, and the register supports both read (data appears on all I/O lines) and write (data written to I/O0) operations.

70V639S12PRFI Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 128-LQFP

Packaging:: Tray

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:: 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:: 128-TQFP (14x20)

70V639S12PRFI FAQ

1.How can I place an order for 70V639S12PRFI through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V639S12PRFI 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 70V639S12PRFI reliable?

The price and inventory of 70V639S12PRFI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V639S12PRFI is usually 5 days.

3.What payment methods are accepted for 70V639S12PRFI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V639S12PRFI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70V639S12PRFI?

70V639S12PRFI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V639S12PRFI 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 70V639S12PRFI?

For technical support, including 70V639S12PRFI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V639S12PRFI requirements.

6.How does Aetrix verify that 70V639S12PRFI is sourced from the original manufacturer or authorized distributors?

All 70V639S12PRFI 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 70V639S12PRFI meets industry standards.

7.What is the process for return or replacement of 70V639S12PRFI?

All 70V639S12PRFI units undergo pre-shipment inspection (PSI). If there is an issue with 70V639S12PRFI, 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 70V639S12PRFI part is unused and in its original packaging.

Return procedure for 70V639S12PRFI:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…