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 70V639S12PRFI8

Name: 70V639S12PRFI8
Brand: Renesas
SKU: 70V639S12PRFI8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 70V639S12PRFI8

Manufacturer:: Renesas

Category:: Memory

Package:: 128-LQFP

Datasheet:: 70V639S12PRFI8.pdf

Description:: IC SRAM 2.25MBIT PAR 128TQFP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,923

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

Product details

Overview

IDT70V639S12PRFI8 from Integrated Device Technology is a high-speed 128K × 18 asynchronous dual-port static RAM with true independent left/right port access, 12 ns maximum access time (industrial grade), 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port-used in real-time inter-processor communication, FPGA co-processor buffering, and legacy bus arbitration systems.

For engineers reviewing the IDT70V639S12PRFI8 datasheet, IDT70V639S12PRFI8 pinout, IDT70V639S12PRFI8 application, or IDT70V639S12PRFI8 equivalent, key selection criteria include simultaneous read/write capability across ports, on-chip semaphore and interrupt logic, BUSY flag arbitration timing (tBAA ≤ 12 ns), and support for mixed-voltage I/O via OPTL/OPTR pins without external level shifters.

Technical Context

The IDT70V639S12PRFI8 implements fully asynchronous dual-port architecture with separate address, control, and bidirectional data buses per port (I/O0L–I/O17L and I/O0R–I/O17R), enabling concurrent access to any memory location without internal contention. Its on-chip arbitration logic resolves port conflicts using BUSY signaling (M/S pin configures master/slave behavior) and supports both CE-controlled and address-match-triggered BUSY assertion.

It integrates full hardware semaphore functionality (8 flags addressed by A0–A2), interrupt generation (INTL/INTR set/clear via dedicated addresses 0x1FFFE/0x1FFFF), and JTAG test interface (IEEE 1149.1 compliant, though disabled in TQFP packages). Power management includes four standby modes (ISB1–ISB4) with full CMOS-level deep-sleep current as low as 3 mA (commercial) or 6 mA (industrial).

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	128K × 18 bits (2,304 Kbit total); enables 36-bit+ word expansion via Master/Slave cascading
Access Time (max)	12 ns (industrial temperature range −40°C to +85°C); guarantees deterministic latency for real-time inter-processor handshaking
Core Supply Voltage	VDD = 3.3 V ± 150 mV; fixed core rail ensures stable SRAM cell operation independent of I/O voltage choice
I/O Supply Voltage	Selectable per port: 3.3 V ± 150 mV or 2.5 V ± 100 mV via OPTL/OPTR pins; eliminates need for external level translators in mixed-voltage systems
Operating Temperature	−40°C to +85°C (industrial grade); validated for use in industrial control, avionics, and telecom infrastructure
Package	128-pin TQFP (PK128); 14 mm × 20 mm body, 0.5 mm pitch; RoHS-compliant green variant available
Standby Current (ISB3)	Max 15 mA (both ports in full CMOS standby); enables ultra-low-power hold mode during system sleep states

Pinout & Package

Package: 128-pin Thin Quad Flatpack (PK128), 14 mm × 20 mm × 1.4 mm body, 0.5 mm lead pitch, lead-free (green) finish.

Pin/Terminal	Circuit Role	Design Meaning
A0L–A16L	Left port address inputs	17-bit address bus for left-side memory access; supports full 128K addressing (2¹⁷ = 131,072 locations)
A0R–A16R	Right port address inputs	Independent 17-bit address bus; enables true asynchronous dual access without address multiplexing
I/O0L–I/O17L	Left port bidirectional data	18-bit data path; LBL/UBL enable byte-select writes (I/O0–I/O8 or I/O9–I/O17) for partial-word updates
I/O0R–I/O17R	Right port bidirectional data	18-bit data path; fully isolated from left port-no shared bus loading or timing coupling
CE0L, CE1L	Left port chip enables	Dual CE logic (CE0L = VIL & CE1L = VIH required for enable); allows depth expansion without external gating logic
CE0R, CE1R	Right port chip enables	Identical dual-CE structure; enables seamless cascading of multiple devices for wider memory systems
R/WL, R/WR	Read/write direction control	Active-low signals; assert low for write, high for read-compatible with standard microprocessor bus timing
OEL, OER	Output enable	Tri-state control for respective port data outputs; used with UB/LB to manage output drive during partial-word reads
BUSYL, BUSYR	Busy status flag	Master: totem-pole output (M/S = VIH); Slave: input (M/S = VIL); resolves port-to-port contention in real time
SEML, SEMR	Semaphore enable	Activates hardware semaphore register access (A0–A2 address 8 flags); enables inter-process synchronization without software polling
INTL, INTR	Interrupt flag	Open-drain outputs (per datasheet note 2); asserted when specific addresses (0x1FFFE/0x1FFFF) are written to trigger event-driven response
M/S	Master/Slave select	Configures BUSY behavior: VIH = BUSY output (master arbitration), VIL = BUSY input (slave wait state)
OPTL, OPTR	I/O voltage option	Set to VIH (3.3 V) or VIL (0 V) to configure corresponding port's VDDQ supply and logic thresholds independently

Key Features

Feature	Design Value
True dual-port memory cells	Enables simultaneous, conflict-free read/write to identical memory locations-critical for lock-free IPC and real-time data exchange
On-chip semaphore logic	Hardware-managed 8-flag semaphore bank (addressed by A0–A2) eliminates software overhead and race conditions in multi-core coordination
Configurable per-port I/O voltage	OPTL/OPTR pins allow independent 3.3 V or 2.5 V I/O operation-supports interfacing with legacy 3.3 V and modern 2.5 V FPGAs or ASICs
Four-tier standby power modes	ISB3 (full CMOS standby) draws only 3–6 mA; enables energy-efficient system suspend/resume without data loss
Master/Slave cascading support	M/S pin and BUSY signaling allow >36-bit word expansion with no external arbitration logic-reduces BOM count and PCB area

Applications

Industrial PLC Backplane Buffer	FPGA-CPU Co-Processor Interface
Use Scenario: Real-time I/O data exchange between CPU and distributed I/O modules over parallel backplane bus. IC Role / Device Role / Timing Role: Dual-port SRAM acts as non-blocking FIFO buffer; left port connects to CPU bus, right port to I/O controller-enabling concurrent read/write without arbitration delay. Use Value: 12 ns access time ensures sub-microsecond response to fieldbus interrupts; BUSY flag prevents data corruption during simultaneous access attempts.	Use Scenario: High-throughput data staging between FPGA-accelerated compute engine and host ARM processor. IC Role / Device Role / Timing Role: IDT70V639S12PRFI8 serves as zero-wait-state shared memory; FPGA writes results to one port while CPU reads from the other-eliminating DMA overhead. Use Value: Per-port 2.5 V/3.3 V I/O support allows direct connection to 2.5 V FPGA banks and 3.3 V CPU bus; no level-shifter ICs required.
Avionics Display System Frame Buffer	Telecom Line Card Packet Buffer
Use Scenario: Storing rendered graphics frames for redundant display controllers in flight deck instrumentation. IC Role / Device Role / Timing Role: Left port receives frame data from primary graphics processor; right port feeds dual independent display drivers-ensuring fault-isolated rendering paths. Use Value: Industrial temperature rating (−40°C to +85°C) and 12 ns timing guarantee meet DO-254 airborne hardware requirements; M/S pin enables master-slave failover configuration.	Use Scenario: Temporary storage of packet headers and payloads in multi-protocol line cards handling Ethernet, SONET, and TDM traffic. IC Role / Device Role / Timing Role: Dual-port RAM buffers ingress/egress streams; semaphore flags coordinate header parsing (port A) and payload assembly (port B) across separate processing engines. Use Value: Hardware semaphore reduces software synchronization latency by >90% vs. polling; tSPS = 5 ns contention window ensures deterministic packet forwarding under load.

Industrial PLC Backplane Buffer

FPGA-CPU Co-Processor Interface

Use Scenario: Real-time I/O data exchange between CPU and distributed I/O modules over parallel backplane bus.

IC Role / Device Role / Timing Role: Dual-port SRAM acts as non-blocking FIFO buffer; left port connects to CPU bus, right port to I/O controller-enabling concurrent read/write without arbitration delay.

Use Value: 12 ns access time ensures sub-microsecond response to fieldbus interrupts; BUSY flag prevents data corruption during simultaneous access attempts.

Use Scenario: High-throughput data staging between FPGA-accelerated compute engine and host ARM processor.

IC Role / Device Role / Timing Role: IDT70V639S12PRFI8 serves as zero-wait-state shared memory; FPGA writes results to one port while CPU reads from the other-eliminating DMA overhead.

Use Value: Per-port 2.5 V/3.3 V I/O support allows direct connection to 2.5 V FPGA banks and 3.3 V CPU bus; no level-shifter ICs required.

Avionics Display System Frame Buffer

Telecom Line Card Packet Buffer

Use Scenario: Storing rendered graphics frames for redundant display controllers in flight deck instrumentation.

IC Role / Device Role / Timing Role: Left port receives frame data from primary graphics processor; right port feeds dual independent display drivers-ensuring fault-isolated rendering paths.

Use Value: Industrial temperature rating (−40°C to +85°C) and 12 ns timing guarantee meet DO-254 airborne hardware requirements; M/S pin enables master-slave failover configuration.

Use Scenario: Temporary storage of packet headers and payloads in multi-protocol line cards handling Ethernet, SONET, and TDM traffic.

IC Role / Device Role / Timing Role: Dual-port RAM buffers ingress/egress streams; semaphore flags coordinate header parsing (port A) and payload assembly (port B) across separate processing engines.

Use Value: Hardware semaphore reduces software synchronization latency by >90% vs. polling; tSPS = 5 ns contention window ensures deterministic packet forwarding under load.

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	128K × 18, 12 ns, 3.3 V core/I/O; no per-port voltage select; no integrated semaphore logic	Lacks hardware semaphore and interrupt flags-requires external logic or firmware for process coordination	Choose when only basic dual-port buffering is needed and system software handles synchronization.
AS7C3128A-12JIN	128K × 18, 12 ns, 3.3 V core/I/O; TQFP-128 package; no JTAG, no BUSY arbitration, no M/S configuration	No hardware arbitration or semaphore-suitable only for controlled, single-master environments with guaranteed non-overlapping access.	Prefer for cost-sensitive designs where inter-port contention is architecturally prevented.

Compared with CY7C1362BV33-12BGXI and AS7C3128A-12JIN, the IDT70V639S12PRFI8 delivers unique value through integrated BUSY arbitration, per-port I/O voltage flexibility, and hardware semaphore-reducing system-level complexity and improving determinism in multi-processor real-time systems.

Availability

IDT70V639S12PRFI8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA co-processor interfaces, and avionics display systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for IDT70V639S12PRFI8 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 delivers high-speed asynchronous dual-port SRAMs optimized for real-time inter-processor communication, legacy bus bridging, and deterministic data exchange-designed to replace discrete logic-based arbitration solutions with integrated hardware functionality.

FAQ

What is the maximum operating temperature range supported by the IDT70V639S12PRFI8?

The IDT70V639S12PRFI8 is rated for industrial temperature operation from −40°C to +85°C. This specification is verified across all electrical parameters including access time (tAA ≤ 12 ns), BUSY timing (tBAA ≤ 12 ns), and standby current (ISB3 ≤ 6 mA), making it suitable for deployment in harsh-environment applications such as factory automation and outdoor telecom equipment.

How does the M/S pin affect BUSY signal behavior in the IDT70V639S12PRFI8?

In the IDT70V639S12PRFI8, the M/S pin configures BUSY as either an output (M/S = VIH) or input (M/S = VIL). When configured as master (VIH), BUSYR/BUSYL actively asserts to block conflicting writes on the opposite port. As slave (VIL), BUSYR/BUSYL is sampled to enter wait states-enabling hierarchical arbitration in multi-device systems without external logic.

Can the left and right ports of the IDT70V639S12PRFI8 operate at different I/O voltages simultaneously?

Yes-the IDT70V639S12PRFI8 supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL = VIH configures the left port for 3.3 V I/O operation (VDDQL = 3.3 V), while OPTR = VIL configures the right port for 2.5 V operation (VDDQR = 2.5 V). This allows direct interfacing with mixed-voltage SoCs or FPGAs without external level shifters.

What is the function of the semaphore feature in the IDT70V639S12PRFI8, and how is it accessed?

The IDT70V639S12PRFI8 includes eight hardware semaphore flags accessed via A0–A2 address lines when SEM = VIL and CE = VIH. Writing to I/O0 places a value into the selected semaphore; reading returns the same value across all I/O pins (I/O0–I/O17). This provides atomic, lock-free inter-process synchronization-eliminating software polling delays and race conditions in multi-core systems.

Does the IDT70V639S12PRFI8 support JTAG boundary scan, and if so, under what conditions?

The IDT70V639S12PRFI8 implements IEEE 1149.1 JTAG boundary scan, but this feature is explicitly disabled in the 128-pin TQFP (PK128) package due to pin count limitations. JTAG remains available only in the 208-ball and 256-ball BGA variants (e.g., IDT70V639S12BF and IDT70V639S12BC). The IDT70V639S12PRFI8 pinout omits TDI, TDO, TCK, TMS, and TRST signals.

70V639S12PRFI8 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 128-LQFP

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:: 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)

70V639S12PRFI8 FAQ

1.How can I place an order for 70V639S12PRFI8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V639S12PRFI8 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 70V639S12PRFI8 reliable?

The price and inventory of 70V639S12PRFI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V639S12PRFI8 is usually 5 days.

3.What payment methods are accepted for 70V639S12PRFI8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V639S12PRFI8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70V639S12PRFI8?

70V639S12PRFI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V639S12PRFI8 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 70V639S12PRFI8?

For technical support, including 70V639S12PRFI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V639S12PRFI8 requirements.

6.How does Aetrix verify that 70V639S12PRFI8 is sourced from the original manufacturer or authorized distributors?

All 70V639S12PRFI8 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 70V639S12PRFI8 meets industry standards.

7.What is the process for return or replacement of 70V639S12PRFI8?

All 70V639S12PRFI8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V639S12PRFI8, 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 70V639S12PRFI8 part is unused and in its original packaging.

Return procedure for 70V639S12PRFI8:

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…