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

Renesas 7024S55J8

Name: 7024S55J8
Brand: Renesas
SKU: 7024S55J8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 7024S55J8

Manufacturer:: Renesas

Category:: Memory

Package:: 84-LCC (J-Lead)

Datasheet:: 7024S55J8.pdf

Description:: IC SRAM 64KBIT PARALLEL 84PLCC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

7024S55J8 from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 55 ns maximum read cycle time (tRC), TTL-compatible 5V ±10% operation, and on-chip semaphore arbitration logic-designed for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 7024S55J8 datasheet, 7024S55J8 pinout, 7024S55J8 application, or 7024S55J8 equivalent, this device supports simultaneous asynchronous access to the same memory location, battery-backed data retention at 2V, and master/slave cascading for 32-bit+ bus expansion without external logic.

Technical Context

The 7024S55J8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent read/write operations across ports. Its on-chip arbitration logic resolves contention via BUSY flag signaling and supports semaphore flag management using A0–A2 addressing and I/O0 as write input.

It features two independent chip enable (CEL/CER), byte enable (UBL/UBR, LBL/LBR), and read/write (R/WL/R/WR) controls per port, plus dedicated interrupt (INTL/INTR) and semaphore enable (SEML/SEMR) signals-enabling deterministic interlock protocols in multi-CPU systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	4K × 16 bits (64 Kbit total); enables 16-bit parallel data path per port without external multiplexing.
Max Read Cycle Time (tRC)	55 ns - guarantees full-speed operation in 18.2 MHz synchronous or burst-controlled systems.
Supply Voltage	5.0 V ±10% - compatible with legacy TTL logic families and eliminates need for level-shifting circuitry.
Data Retention Voltage	2.0 V minimum - supports battery backup with ultra-low standby current (1 µA typ. for 7024L variant).
Operating Temperature	–40°C to +85°C - qualified for industrial-grade embedded applications including motor control and PLCs.
Package	100-pin Thin Quad Flatpack (TQFP) - surface-mount compatible with automated assembly and thermal performance suitable for convection-cooled enclosures.
Power Consumption (Active)	265 mA max (7024S) at fMAX - enables predictable thermal budgeting in dense memory subsystems.

Pinout & Package

7024S55J8 is packaged in a 100-pin TQFP (PNG100) with 0.5 mm pitch, 14 mm × 14 mm body size, and 1.4 mm height. All VCC pins require local decoupling; all GND pins must be connected to system ground plane for signal integrity.

Pin/Terminal	Circuit Role	Design Meaning
CEL / CER	Chip Enable (Left / Right)	Independent port activation; deassertion places respective port in low-power standby mode.
R/WL / R/WR	Read/Write Control (Left / Right)	Active-low control determining direction of data transfer on corresponding port's I/O bus.
UBL / UBR, LBL / LBR	Upper/Lower Byte Select	Enables byte-level granularity for 8-bit peripheral interfacing or multiplexed bus compatibility.
SEML / SEMR	Semaphore Enable	Activates 3-bit semaphore register access (A0–A2) for inter-processor synchronization without software polling.
BUSYL / BUSYR	Busy Flag (Master Output / Slave Input)	Indicates port contention; when M/S = H, BUSY is output; when M/S = L, BUSY is input for slave coordination.
INTL / INTR	Interrupt Flag	Open-drain push-pull output signaling completion of semaphore write or arbitration event to host CPU.
A0L–A11L / A0R–A11R	Address Inputs (12-bit)	Directly selects one of 4,096 memory locations per port; no internal address latching required.
I/O0L–I/O15L / I/O0R–I/O15R	Bi-directional Data Bus (16-bit)	True dual-port data path supporting simultaneous reads from same address-critical for lock-free shared memory.

Key Features

Feature	Design Value
True Dual-Port Memory Cells	Enables concurrent read access to identical memory addresses by both ports-eliminates need for shadow buffers or software arbitration.
On-Chip Semaphore Logic	Eight hardware semaphore flags accessible via A0–A2 and I/O0; reduces inter-CPU synchronization latency to ≤5 ns (tSWRD).
Master/Slave Cascading Support	M/S pin configures device as master (BUSY output) or slave (BUSY input), enabling seamless 32-bit+ word expansion without glue logic.
Full Asynchronous Operation	No clock required-each port operates independently with timing governed solely by CE, R/W, and OE transitions.
Battery Backup Data Retention	Maintains valid data at 2V supply with ISB3 ≤ 5 µA (7024L), enabling non-volatile operation during main power loss.

Applications

Industrial PLC Memory Buffer	Dual-Core DSP Shared Memory
Use Scenario: Real-time I/O scanning and program execution in programmable logic controllers requiring deterministic memory access between CPU and I/O coprocessor. IC Role / Device Role / Timing Role: Acts as shared scratchpad memory with BUSY-driven arbitration ensuring atomic read-modify-write cycles during ladder logic scan. Use Value: Eliminates external arbitration logic and reduces worst-case interlock delay to ≤55 ns (tRC), improving scan cycle consistency.	Use Scenario: Coherent data exchange between two DSP cores executing parallel signal processing tasks (e.g., FFT and filtering) on shared sensor data. IC Role / Device Role / Timing Role: Provides zero-wait-state dual-access memory with semaphore flags coordinating buffer ownership and pipeline stage handoff. Use Value: Enables lock-free producer-consumer pattern with tSPS ≤ 5 ns, preventing pipeline stalls in real-time audio/video systems.
Avionics Flight Control Interface	Medical Imaging Data Pipeline
Use Scenario: Safety-critical flight control computer interfacing with redundant sensor acquisition modules requiring fault-tolerant memory sharing. IC Role / Device Role / Timing Role: Serves as mirrored memory interface with M/S-configured master/slave pair ensuring synchronized updates and error detection via BUSY assertion. Use Value: Guarantees atomic writes across ports with tBDD ≤ 30 ns, meeting DO-254 timing closure requirements for Level A hardware.	Use Scenario: High-throughput image reconstruction pipeline where FPGA-accelerated preprocessing writes to memory while ARM-based display controller reads rendered frames. IC Role / Device Role / Timing Role: Functions as frame buffer with independent 16-bit I/O paths-supporting simultaneous 120 MB/s write (preprocessing) and 120 MB/s read (display) bandwidth. Use Value: Delivers sustained 16-bit throughput without wait states, enabling 4K@60fps rendering with <1 ms frame latency.

Industrial PLC Memory Buffer

Dual-Core DSP Shared Memory

Use Scenario: Real-time I/O scanning and program execution in programmable logic controllers requiring deterministic memory access between CPU and I/O coprocessor.

IC Role / Device Role / Timing Role: Acts as shared scratchpad memory with BUSY-driven arbitration ensuring atomic read-modify-write cycles during ladder logic scan.

Use Value: Eliminates external arbitration logic and reduces worst-case interlock delay to ≤55 ns (tRC), improving scan cycle consistency.

Use Scenario: Coherent data exchange between two DSP cores executing parallel signal processing tasks (e.g., FFT and filtering) on shared sensor data.

IC Role / Device Role / Timing Role: Provides zero-wait-state dual-access memory with semaphore flags coordinating buffer ownership and pipeline stage handoff.

Use Value: Enables lock-free producer-consumer pattern with tSPS ≤ 5 ns, preventing pipeline stalls in real-time audio/video systems.

Avionics Flight Control Interface

Medical Imaging Data Pipeline

Use Scenario: Safety-critical flight control computer interfacing with redundant sensor acquisition modules requiring fault-tolerant memory sharing.

IC Role / Device Role / Timing Role: Serves as mirrored memory interface with M/S-configured master/slave pair ensuring synchronized updates and error detection via BUSY assertion.

Use Value: Guarantees atomic writes across ports with tBDD ≤ 30 ns, meeting DO-254 timing closure requirements for Level A hardware.

Use Scenario: High-throughput image reconstruction pipeline where FPGA-accelerated preprocessing writes to memory while ARM-based display controller reads rendered frames.

IC Role / Device Role / Timing Role: Functions as frame buffer with independent 16-bit I/O paths-supporting simultaneous 120 MB/s write (preprocessing) and 120 MB/s read (display) bandwidth.

Use Value: Delivers sustained 16-bit throughput without wait states, enabling 4K@60fps rendering with <1 ms frame latency.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY7C136-55JC	55 ns access, 4K × 16, but uses 3.3V core with 5V-tolerant I/O; no built-in semaphore logic.	Requires external logic for semaphore emulation; better suited for mixed-voltage systems than battery backup.	Select when migrating to lower-voltage domains or when external arbitration is already implemented.
AS7C34096A-55JC	55 ns, 4K × 16, 5V-only, but lacks BUSY/INT signals and master/slave configuration capability.	Supports basic dual-port operation only-no hardware inter-processor signaling; limited to simple ping-pong buffering.	Choose for cost-sensitive designs where arbitration is handled entirely in firmware or external CPLD.

Compared with CY7C136-55JC and AS7C34096A-55JC, the 7024S55J8 uniquely integrates semaphore registers, BUSY flag arbitration, and M/S cascading-reducing BOM count and eliminating timing-critical external logic in tightly coupled multi-processor systems.

Availability

7024S55J8 is available at Aetrix Electronics and suitable for industrial PLC memory buffers, avionics flight control interfaces, and medical imaging data pipelines requiring stable component supply across extended product lifecycles.

Supply support for 7024S55J8 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, and RF solutions, acquired by Renesas Electronics in 2019.

The 7024S55J8 belongs to IDT's high-speed dual-port SRAM product line, engineered for deterministic inter-processor communication in real-time embedded systems demanding sub-60 ns latency and hardware-enforced synchronization.

FAQ

What is the guaranteed maximum read cycle time for the 7024S55J8?

The 7024S55J8 has a guaranteed maximum read cycle time (tRC) of 55 ns across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply voltage. This specification ensures reliable operation in high-speed real-time control loops without timing margin violations.

Does the 7024S55J8 support battery backup operation, and what is the minimum retention voltage?

Yes, the 7024S55J8 (L-version variant) supports battery backup operation with guaranteed data retention down to 2.0 V (VDR). At this voltage, typical data retention current is 100 µA, enabling multi-year retention with small coin-cell batteries in power-fail scenarios.

How does the Master/Slave (M/S) pin function in the 7024S55J8?

When M/S = H, the 7024S55J8 operates as a master with BUSYR and BUSYL driven as outputs indicating port contention. When M/S = L, it acts as a slave with BUSYR/BUSYL configured as inputs-enabling daisy-chained arbitration for 32-bit+ word systems without external logic.

Can the 7024S55J8 perform simultaneous reads from the same memory address on both ports?

Yes, the 7024S55J8 uses true dual-port memory cells that allow completely independent, simultaneous read operations from identical addresses on the left and right ports-enabling lock-free shared memory architectures in multi-CPU systems.

What package type is used for the 7024S55J8, and what are its key mechanical dimensions?

The 7024S55J8 is supplied in a 100-pin Thin Quad Flatpack (TQFP) package (PNG100) measuring 14 mm × 14 mm with 0.5 mm lead pitch and 1.4 mm maximum height-optimized for automated SMT assembly and thermal dissipation in industrial PCB layouts.

7024S55J8 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Volatile

Memory Format:: SRAM

Technology:: SRAM - Dual Port, Asynchronous

Memory Size:: 64Kbit

Memory Organization:: 4K x 16

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 55ns

Access Time:: 55 ns

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

7024S55J8 FAQ

1.How can I place an order for 7024S55J8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 7024S55J8 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 7024S55J8 reliable?

The price and inventory of 7024S55J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7024S55J8 is usually 5 days.

3.What payment methods are accepted for 7024S55J8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7024S55J8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 7024S55J8?

7024S55J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 7024S55J8 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 7024S55J8?

For technical support, including 7024S55J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7024S55J8 requirements.

6.How does Aetrix verify that 7024S55J8 is sourced from the original manufacturer or authorized distributors?

All 7024S55J8 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 7024S55J8 meets industry standards.

7.What is the process for return or replacement of 7024S55J8?

All 7024S55J8 units undergo pre-shipment inspection (PSI). If there is an issue with 7024S55J8, 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 7024S55J8 part is unused and in its original packaging.

Return procedure for 7024S55J8:

1.Submit a request within 90 days.

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

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