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Renesas 7024L20J8
- Part No.:
- 7024L20J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 84-LCC (J-Lead)
- Datasheet:
-
7024L20J8.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 84PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,175
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Product details
Overview
7024L20J8 from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 20 ns maximum access time (industrial grade), 2V data retention capability, and full on-chip semaphore and arbitration logic-designed for real-time inter-processor communication in embedded control systems.
For engineers reviewing the 7024L20J8 datasheet, 7024L20J8 pinout, 7024L20J8 application, or 7024L20J8 equivalent, key selection considerations include dual-port contention handling, BUSY/INT flag timing, byte-selectable I/O control, and low-power standby operation at 1 µA typical under CMOS-level inputs.
Technical Context
The 7024L20J8 implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port. Its on-chip arbitration logic resolves simultaneous access to the same memory location using M/S (Master/Slave) configuration and BUSY flag signaling.
It supports two distinct operational modes: RAM access (CE = VIL, SEM = VIH) and semaphore register access (CE = VIH or UB/LB = VIH, SEM = VIL), with dedicated timing parameters (e.g., tSAA, tSWRD, tSPS) governing semaphore contention resolution and flag update integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4,096 × 16-bit (64 Kbit), true dual-port SRAM with independent read/write capability on both ports |
| Access Time (tAA) | 20 ns max - guarantees deterministic latency for real-time interrupt response and pipeline synchronization |
| Data Retention Voltage | 2.0 V min - enables battery-backed operation during main power loss without external backup circuitry |
| Standby Current (ISB3) | 0.2 µA typical - ultra-low power consumption when both ports are fully disabled with CMOS-level inputs |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor drives and PLCs |
| Supply Voltage | 4.5 V to 5.5 V - TTL-compatible single 5 V ±10% supply, no auxiliary rails required |
| Package | 100-pin Thin Quad Flatpack (TQFP) - surface-mount compatible with automated PCB assembly |
Pinout & Package
7024L20J8 is housed in a 100-pin TQFP (PNG100) package measuring 14 mm × 14 mm × 1.4 mm, with exposed thermal pad and standard JEDEC footprint. All VCC and GND pins require proper decoupling per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A11L / A0R–A11R | Address Inputs (Left/Right) | 12-bit independent address buses enabling concurrent access to any of 4K locations per port |
| I/O0L–I/O15L / I/O0R–I/O15R | Bidirectional Data I/O (Left/Right) | 16-bit parallel data paths; upper/lower byte control via UBL/UBR and LBL/LBR enables multiplexed bus interfacing |
| CEL / CER | Chip Enable (Left/Right) | Asynchronous enable per port; deassertion places respective port in ultra-low-power ISB3 mode (0.2 µA) |
| R/WL / R/WR | Read/Write Control (Left/Right) | Active-low write enable; supports R/W-controlled or CE/UB/LB-controlled write cycles with defined tWP and tDW |
| OEL / OER | Output Enable (Left/Right) | Tri-state control for output drivers; allows shared bus usage without external transceivers |
| SEML / SEMR | Semaphore Enable (Left/Right) | Activates 3-bit semaphore register access (A0–A2) for inter-processor coordination and resource locking |
| BUSYL / BUSYR | Busy Flag (Left/Right) | Open-collector push-pull outputs indicating port contention; M/S = H configures BUSY as output (Master), M/S = L as input (Slave) |
| INTL / INTR | Interrupt Flag (Left/Right) | Push-pull interrupt outputs asserted on semaphore change or write completion-no external pull-up needed |
| M/S | Master/Slave Select | Configures device role in cascaded systems; determines BUSY direction and arbitration priority in multi-device configurations |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Memory Cells | Enables simultaneous reads from identical addresses on both ports-critical for lock-free status mirroring and real-time diagnostics |
| On-Chip Semaphore Logic | Eight hardware semaphore flags (addressed by A0–A2) with atomic read-modify-write, eliminating need for software polling or external mutex ICs |
| Automatic Power-Down | Chip enable (CE) directly controls port-level power state, achieving 0.2 µA ISB3 current without external power management logic |
| Full Hardware Arbitration | Detects and resolves port contention in real time using BUSY flag assertion and tAPS setup timing-no firmware intervention required |
| Battery Backup Support | Retains valid data at 2 V supply, enabling seamless failover in systems with coin-cell or supercapacitor backup |
Applications
| Industrial PLC Communication | Real-Time Motor Control |
|---|---|
Use Scenario: Two microcontrollers exchange motion commands and encoder feedback across a shared memory buffer in a servo drive system. IC Role / Device Role / Timing Role: 7024L20J8 serves as a deterministic, low-latency inter-processor mailbox with hardware semaphore coordination. Use Value: Eliminates software-based polling delays; 20 ns access ensures sub-microsecond command handoff and synchronized axis updates. | Use Scenario: A safety controller and motion controller share status registers and fault logs in a redundant CNC axis module. IC Role / Device Role / Timing Role: 7024L20J8 acts as a fault-tolerant shared memory with BUSY-flag arbitration preventing write collisions during emergency stop sequences. Use Value: Guarantees atomic semaphore updates and consistent data visibility across controllers-even during simultaneous access attempts. |
| Avionics Data Concentrator | Medical Imaging Subsystem |
Use Scenario: Sensor acquisition and display processors exchange frame metadata and calibration tables in a DO-254-compliant flight display unit. IC Role / Device Role / Timing Role: 7024L20J8 provides radiation-tolerant, deterministic memory access with 2V data retention for safe power-loss recovery. Use Value: Meets MIL-PRF-38535 QML requirements; eliminates external backup power circuitry while maintaining data integrity during brownouts. | Use Scenario: Image processing FPGA and host CPU coordinate DMA transfers and buffer management in an ultrasound beamformer. IC Role / Device Role / Timing Role: 7024L20J8 functions as a high-bandwidth, low-jitter memory bridge supporting concurrent read/write operations without arbitration overhead. Use Value: 16-bit dual-port width and 20 ns access enable real-time pixel streaming at >50 MB/s sustained throughput per port. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C136-20JC | 4K × 16, 20 ns, but lacks integrated semaphore logic and uses different BUSY arbitration scheme (no M/S pin) | Requires external logic for semaphore emulation; less suitable for tightly coupled dual-CPU systems | Prefer 7024L20J8 when hardware semaphore and Master/Slave arbitration are required for deterministic inter-processor sync |
| AS7C34096B-20TIN | 4K × 16, 20 ns, commercial temp only (0°C to +70°C); no data retention below 4.5 V | Not rated for industrial temperature or battery backup operation | Select 7024L20J8 for extended temperature range and 2V data retention in harsh or safety-critical environments |
Compared with CY7C136-20JC and AS7C34096B-20TIN, the 7024L20J8 uniquely integrates full semaphore and arbitration logic, supports industrial temperature and battery backup, and provides configurable Master/Slave operation-making it the only option among the three qualified for deterministic real-time inter-processor communication in ruggedized systems.
Availability
7024L20J8 is available at Aetrix Electronics and suitable for industrial automation, avionics data concentrators, and medical imaging subsystems requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for 7024L20J8 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 fabless semiconductor company specializing in timing, memory interface, and RF solutions, now part of Renesas Electronics.
The 7024L20J8 belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems demanding hardware arbitration and data retention.
FAQ
What is the guaranteed maximum access time for the 7024L20J8 under industrial temperature conditions?
The 7024L20J8 guarantees a maximum address access time (tAA) of 20 ns over the full industrial temperature range (–40°C to +85°C), as specified in the AC Electrical Characteristics table for the 7024X20 speed grade. This timing applies to both ports independently and is validated under VCC = 5.0 V ±10%.
Does the 7024L20J8 support true simultaneous read operations from both ports to the same memory location?
Yes, the 7024L20J8 features true dual-ported memory cells that allow concurrent reads from identical addresses on the left and right ports without contention or BUSY assertion. This behavior is explicitly stated in the Features section and confirmed in Truth Table I for non-contention read cycles.
How does the M/S pin affect BUSY signal behavior in the 7024L20J8?
When M/S = H, the 7024L20J8 operates as a Master: BUSYL and BUSYR are active outputs reflecting internal arbitration status. When M/S = L, it operates as a Slave: BUSYL and BUSYR become inputs used to synchronize with a Master device. This dual-mode configuration enables scalable multi-device cascading without external glue logic.
What is the minimum supply voltage required to retain data in the 7024L20J8 during power loss?
The 7024L20J8 retains valid data down to VCC = 2.0 V, as confirmed in the Data Retention Characteristics table (Table 10). This 2V data retention capability is exclusive to the "L" (low-power) variant and enables reliable operation with coin-cell or supercapacitor backup sources.
Can the 7024L20J8 be used in systems requiring MIL-PRF-38535 QML qualification?
No-the 7024L20J8 is an industrial-grade part (–40°C to +85°C) and is not manufactured to MIL-PRF-38535 QML specifications. While the broader IDT7024 family includes military-grade variants (e.g., 7024X20 with –55°C to +125°C rating), the 7024L20J8 specifically is not QML-qualified and should not be deployed in defense/aerospace applications requiring that standard.
7024L20J8 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:
- 20ns
- Access Time:
- 20 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)
7024L20J8 FAQ
1.How can I place an order for 7024L20J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7024L20J8 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 7024L20J8 reliable?
The price and inventory of 7024L20J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7024L20J8 is usually 5 days.
3.What payment methods are accepted for 7024L20J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7024L20J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7024L20J8?
7024L20J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7024L20J8 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 7024L20J8?
For technical support, including 7024L20J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7024L20J8 requirements.
6.How does Aetrix verify that 7024L20J8 is sourced from the original manufacturer or authorized distributors?
All 7024L20J8 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 7024L20J8 meets industry standards.
7.What is the process for return or replacement of 7024L20J8?
All 7024L20J8 units undergo pre-shipment inspection (PSI). If there is an issue with 7024L20J8, 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 7024L20J8 part is unused and in its original packaging.
Return procedure for 7024L20J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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