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

Renesas 70V25L35J

Name: 70V25L35J
Brand: Renesas
SKU: 70V25L35J
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70V25L35J

Manufacturer:: Renesas

Category:: Memory

Package:: 84-LCC (J-Lead)

Datasheet:: 70V25L35J.pdf

Description:: IC SRAM 128KBIT PARALLEL 84PLCC

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Product details

Overview

IDT70V25L35J from Integrated Device Technology is a high-speed 3.3V 4K x 16 true dual-port static RAM with independent left/right ports, 35ns read cycle time, 35ns write cycle time, and 660μW typical standby power. It enables simultaneous asynchronous access to shared memory in real-time inter-processor communication systems, such as industrial PLCs with redundant CPU modules.

For engineers reviewing the IDT70V25L35J datasheet, IDT70V25L35J pinout, IDT70V25L35J application, or IDT70V25L35J equivalent, key selection criteria include its 100-pin TQFP package, LVTTL-compatible 3.3V operation, on-chip semaphore logic for resource arbitration, BUSY/INT flag signaling, and byte-selectable I/O control for multiplexed bus compatibility.

Technical Context

The IDT70V25L35J implements fully asynchronous dual-port architecture with separate address, control, and data buses per port, allowing concurrent read/write operations-even to the same memory location-without external arbitration logic. Its on-chip port arbitration and semaphore logic support eight hardware-managed semaphores addressed via A0–A2.

It operates from a single 3.3V ±0.3V supply, uses CMOS high-performance fabrication, and features automatic power-down via CE-controlled standby modes. The device supports MASTER/SLAVE cascading for 32-bit+ data bus expansion using M/S pin configuration and BUSY flag handshaking.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	4K × 16 (64 Kbit), true dual-port SRAM
Read Cycle Time	35 ns max - defines minimum clock period for synchronous interface or maximum sustained throughput in asynchronous mode
Write Cycle Time	35 ns max - determines shortest write pulse duration required for reliable data capture
Standby Power	660 μW typ - enables ultra-low-power hold mode during processor idle states without data loss
Supply Voltage	3.3 V ±0.3 V - compatible with modern low-voltage digital systems; no level-shifting needed
Operating Temperature	−40°C to +85°C - qualified for industrial environments including factory automation and motor drives
I/O Interface	LVTTL-compatible - directly interfaces with 3.3V FPGAs, microcontrollers, and ASICs

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), 14 mm × 14 mm × 1.4 mm body, lead-free (green) compliant.

Pin/Terminal	Circuit Role	Design Meaning
CEL / CER	Chip Enable (Left/Right)	Independent port activation; each port enters low-power standby when its CE is HIGH
R/WL / R/WR	Read/Write Control (Left/Right)	Active-LOW signal determining data direction per port; enables true bidirectional I/O
OEL / OER	Output Enable (Left/Right)	Tri-states I/O pins independently per port, enabling shared bus contention management
UBL / UBR, LBL / LBR	Upper/Lower Byte Select	Enables 8-bit granularity writes/reads - critical for mixed-width peripheral interfacing
SEML / SEMR	Semaphore Enable	Activates hardware semaphore register access (A0–A2 address space) for inter-processor synchronization
BUSYL / BUSYR	Busy Flag (Master/Slave)	Open-drain push-pull output indicating port contention; used for handshake-based arbitration
INTL / INTR	Interrupt Flag	Signals completion of semaphore operations or user-defined event triggers to host processors
A0L–A11L, A0R–A11R	Address Inputs	12-bit addressing per port supports full 4K depth; A12 is NC for IDT70V25 variants
I/O0L–I/O7L, I/O0R–I/O7R	Data I/O (Lower Byte)	8-bit bidirectional data path per port; lower-byte control simplifies 16-bit bus partitioning
I/O8L–I/O15L, I/O8R–I/O15R	Data I/O (Upper Byte)	8-bit bidirectional data path per port; paired with LBL/UBR for full 16-bit transfers

Key Features

Feature	Design Value
True Dual-Port Architecture	Enables simultaneous reads/writes from both ports to identical addresses - eliminates software polling delays in lock-step systems
Hardware Semaphore Logic	Eight dedicated flags accessible via A0–A2; resolves resource contention without CPU intervention or external logic
Separate Upper/Lower Byte Control	Supports partial-word writes and mixed-data-width peripherals - reduces bus turnaround overhead in legacy system upgrades
MASTER/SLAVE Cascading Support	M/S pin configures BUSY as output (Master) or input (Slave), enabling scalable 32-bit+ memory expansion without glue logic
Ultra-Low Standby Power	660 μW typical at 3.3V - extends battery life in always-on industrial gateways and remote I/O modules

Applications

Industrial PLC Inter-Processor Communication	Redundant Controller Memory Sharing
Use Scenario: Two independent CPUs in a safety-critical PLC exchange status, setpoints, and diagnostics via shared memory. IC Role / Device Role / Timing Role: IDT70V25L35J serves as the synchronized dual-port buffer between primary and backup controllers, handling concurrent read/write requests with hardware semaphore arbitration. Use Value: Eliminates need for external arbitration logic and reduces inter-CPU latency to ≤35 ns, meeting IEC 61508 SIL-3 timing constraints.	Use Scenario: Redundant motion controllers maintain identical state images; one assumes control upon failure detection. IC Role / Device Role / Timing Role: IDT70V25L35J provides non-blocking, atomic memory updates between active and standby controllers using BUSY flag handshaking. Use Value: Enables sub-millisecond failover by guaranteeing consistent memory state without software locks or bus cycles.
Real-Time Data Acquisition Buffer	FPGA-Based Protocol Translation Bridge
Use Scenario: High-speed analog-to-digital subsystem streams sensor data to a DSP while firmware processes prior frames. IC Role / Device Role / Timing Role: IDT70V25L35J acts as a ping-pong buffer - one port accepts ADC data at 10 MSPS, the other feeds processed results to host. Use Value: Sustains 28 MB/s aggregate bandwidth (35 ns cycle × 16-bit width × 2 ports), preventing FIFO overflow in vibration monitoring systems.	Use Scenario: FPGA bridges Modbus RTU and EtherCAT protocols; requires fast register mapping and command queuing. IC Role / Device Role / Timing Role: IDT70V25L35J stores protocol-specific registers and message buffers, accessed concurrently by FPGA logic and microcontroller firmware. Use Value: Enables zero-wait-state register access for both masters, reducing protocol translation latency below 100 ns per transaction.

Industrial PLC Inter-Processor Communication

Redundant Controller Memory Sharing

Use Scenario: Two independent CPUs in a safety-critical PLC exchange status, setpoints, and diagnostics via shared memory.

IC Role / Device Role / Timing Role: IDT70V25L35J serves as the synchronized dual-port buffer between primary and backup controllers, handling concurrent read/write requests with hardware semaphore arbitration.

Use Value: Eliminates need for external arbitration logic and reduces inter-CPU latency to ≤35 ns, meeting IEC 61508 SIL-3 timing constraints.

Use Scenario: Redundant motion controllers maintain identical state images; one assumes control upon failure detection.

IC Role / Device Role / Timing Role: IDT70V25L35J provides non-blocking, atomic memory updates between active and standby controllers using BUSY flag handshaking.

Use Value: Enables sub-millisecond failover by guaranteeing consistent memory state without software locks or bus cycles.

Real-Time Data Acquisition Buffer

FPGA-Based Protocol Translation Bridge

Use Scenario: High-speed analog-to-digital subsystem streams sensor data to a DSP while firmware processes prior frames.

IC Role / Device Role / Timing Role: IDT70V25L35J acts as a ping-pong buffer - one port accepts ADC data at 10 MSPS, the other feeds processed results to host.

Use Value: Sustains 28 MB/s aggregate bandwidth (35 ns cycle × 16-bit width × 2 ports), preventing FIFO overflow in vibration monitoring systems.

Use Scenario: FPGA bridges Modbus RTU and EtherCAT protocols; requires fast register mapping and command queuing.

IC Role / Device Role / Timing Role: IDT70V25L35J stores protocol-specific registers and message buffers, accessed concurrently by FPGA logic and microcontroller firmware.

Use Value: Enables zero-wait-state register access for both masters, reducing protocol translation latency below 100 ns per transaction.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY7C024AV-35JC	4K × 16, 35 ns, 3.3V, 100-pin TQFP - identical speed and organization but Cypress implementation with different BUSY assertion timing (tBDD = 10 ns vs. IDT's unspecified)	Requires validation of BUSY flag timing in master/slave handshake loops; not drop-in for systems relying on IDT's arbitration waveform	Select when migrating from legacy Cypress designs or when second-source assurance is required for long-term supply
AS7C34096A-35JC	4K × 16, 35 ns, 3.3V, 100-pin TQFP - lacks hardware semaphore logic and BUSY/INT flags; only basic dual-port functionality	Cannot replace IDT70V25L35J in systems requiring inter-processor synchronization without adding external logic or firmware overhead	Choose only for cost-sensitive applications where semaphore arbitration is handled in software or external CPLD

Compared with CY7C024AV-35JC and AS7C34096A-35JC, the IDT70V25L35J uniquely integrates full hardware semaphore support and configurable BUSY flag behavior essential for deterministic real-time inter-processor communication - neither alternative offers this combination of speed, integration, and industrial temperature reliability.

Availability

IDT70V25L35J is available at Aetrix Electronics and suitable for industrial PLCs, redundant motion controllers, real-time data acquisition systems, and FPGA-based protocol bridges requiring stable component supply across extended product lifecycles.

Supply support for IDT70V25L35J 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 power management ICs for communications, computing, and industrial markets.

The IDT70V25 family was designed specifically for high-reliability, low-latency inter-processor communication in industrial automation and embedded control systems - emphasizing hardware arbitration, deterministic timing, and extended temperature operation.

FAQ

What is the maximum operating temperature range for the IDT70V25L35J?

The IDT70V25L35J is rated for industrial temperature operation from −40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings table and supported by DC/AC electrical characteristics tested across this full range. The device maintains guaranteed 35 ns read/write timing and 660 μW standby power within this envelope, making it suitable for deployment in uncontrolled factory environments and outdoor control cabinets.

Does the IDT70V25L35J support hardware semaphore functionality, and how is it accessed?

Yes, the IDT70V25L35J includes full on-chip hardware semaphore logic supporting eight independent flags. These are accessed by asserting SEM = VIL while holding UB = LB = VIH (or CE = VIH), then using A0–A2 to select the semaphore register. Data is written via I/O0 and read back across all I/O lines (I/O0–I/O15). The tSWRD (5 ns) and tSPS (5 ns) parameters define the timing window for safe semaphore read-after-write and contention resolution.

What package type and pin count does the IDT70V25L35J use?

The IDT70V25L35J is packaged in a 100-pin Thin Quad Flatpack (TQFP) with a 14 mm × 14 mm body and 1.4 mm height. Pin configuration matches the IDT70V25/24 series layout: A12 is No Connect on both ports, and I/O0–I/O15 are assigned per port with dedicated upper/lower byte controls (UBL/UBR, LBL/LBR). This package is RoHS-compliant and green (halogen-free).

How does the BUSY flag operate in MASTER versus SLAVE configuration on the IDT70V25L35J?

When M/S = VIH, the device operates as MASTER and asserts BUSYL/BUSYR as open-drain push-pull outputs indicating local port contention. When M/S = VIL, it operates as SLAVE and accepts BUSY input on those pins for cascade arbitration. The BUSY signal is active-HIGH and remains asserted until the contending port completes its access - enabling hardware handshaking without CPU polling. This behavior is defined in the functional block diagram and truth tables.

Is the IDT70V25L35J compatible with 3.3V LVTTL logic families without level shifting?

Yes, the IDT70V25L35J is fully LVTTL-compatible with VIH = 2.0 V min and VIL = 0.8 V max, matching standard 3.3V logic thresholds. Its outputs drive VOH ≥ 2.4 V at IOH = −4 mA and VOL ≤ 0.4 V at IOL = +4 mA, ensuring noise margins >0.4 V in typical PCB layouts. Input capacitance is 9 pF and output capacitance is 10 pF, supporting clean signal integrity up to 28 MHz sustained operation.

70V25L35J Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 84-LCC (J-Lead)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Volatile

Memory Format:: SRAM

Technology:: SRAM - Dual Port, Asynchronous

Memory Size:: 128Kbit

Memory Organization:: 8K x 16

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 35ns

Access Time:: 35 ns

Voltage - Supply:: 3V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 84-PLCC (29.31x29.31)

70V25L35J FAQ

1.How can I place an order for 70V25L35J through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V25L35J 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 70V25L35J reliable?

The price and inventory of 70V25L35J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V25L35J is usually 5 days.

3.What payment methods are accepted for 70V25L35J?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V25L35J transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70V25L35J?

70V25L35J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V25L35J 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 70V25L35J?

For technical support, including 70V25L35J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V25L35J requirements.

6.How does Aetrix verify that 70V25L35J is sourced from the original manufacturer or authorized distributors?

All 70V25L35J 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 70V25L35J meets industry standards.

7.What is the process for return or replacement of 70V25L35J?

All 70V25L35J units undergo pre-shipment inspection (PSI). If there is an issue with 70V25L35J, 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 70V25L35J part is unused and in its original packaging.

Return procedure for 70V25L35J:

1.Submit a request within 90 days.

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

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