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Renesas 7024L55JI8
- Part No.:
- 7024L55JI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 84-LCC (J-Lead)
- Datasheet:
-
7024L55JI8.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 84PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,392
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Product details
Overview
7024L55JI8 from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 55 ns maximum read cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports simultaneous asynchronous access, on-chip semaphore signaling, and master/slave arbitration for 32-bit+ bus expansion in real-time embedded control systems.
For engineers reviewing the 7024L55JI8 datasheet, 7024L55JI8 pinout, 7024L55JI8 application, or 7024L55JI8 equivalent, key selection considerations include BUSY flag timing (tBDD ≤ 30 ns), battery-backed data retention at 2V, low standby current (1 µA typ.), and PLCC-84 package compatibility with legacy military/industrial PCB layouts.
Technical Context
The 7024L55JI8 implements full hardware port arbitration with dedicated BUSY output (master) or input (slave), enabling deterministic conflict resolution without external logic. Its dual-port architecture allows concurrent reads from the same memory location and supports semaphore flag operations via A0–A2 addressing with I/O0 write and full-I/O read capability.
It features separate upper-byte (UB/UBR) and lower-byte (LB/LBR) controls for multiplexed bus interfacing, and integrates automatic power-down via CE-driven standby modes - including full CMOS-level standby consuming only 0.2 mA typ. at 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 16 (64 Kbit), true dual-port SRAM with independent address/data/control per port |
| Access Time (tAA) | 55 ns max - defines minimum time from valid address to stable data output on either port |
| Read Cycle Time (tRC) | 55 ns max - determines maximum sustained read throughput (18.2 MHz) without inter-cycle gaps |
| Standby Current (ISB3) | 0.2 mA typ. - enables ultra-low-power battery backup operation with 2V data retention |
| Operating Voltage | 5.0 V ±10% - TTL-compatible supply; no level-shifting required in 5V system designs |
| Temperature Range | –40°C to +85°C - qualified for industrial environments with guaranteed parametric performance |
| Input Capacitance | 9 pF max - ensures signal integrity and timing margin in high-speed parallel bus routing |
Pinout & Package
7024L55JI8 is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC-84), body size ≈ 1.15 in × 1.15 in × 0.17 in, with gull-wing leads and standard JEDEC MO-047 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A11L | Left Port Address Inputs | 12-bit address bus for left-side memory access; fully asynchronous with right port |
| A0R–A11R | Right Port Address Inputs | Independent 12-bit address bus; enables true concurrent access to same or different locations |
| I/O0L–I/O15L | Left Port Bidirectional Data | 16-bit data path; byte-selectable via UBL/LBL for multiplexed bus compatibility |
| I/O0R–I/O15R | Right Port Bidirectional Data | 16-bit data path; supports simultaneous read/write across ports without contention logic |
| CEL / CER | Chip Enable (Left/Right) | Active-low enables; each port can be independently powered down to reduce system ICC |
| R/WL / R/WR | Read/Write Control (Left/Right) | Determines direction of data flow per port; supports mixed read/write operations |
| UBL / UBR | Upper-Byte Select | Enables I/O8–I/O15 only; essential for 8-bit bus interfaces or partial-word writes |
| LBL / LBR | Lower-Byte Select | Enables I/O0–I/O7 only; used with UBL/UBR for granular byte-level control |
| SEML / SEMR | Semaphore Enable | Activates 8-flag semaphore register (A0–A2 addressed); critical for inter-processor synchronization |
| BUSYL / BUSYR | Busy Flag (Master Output / Slave Input) | Indicates port contention; M/S = H configures BUSY as output, M/S = L as input |
| INTL / INTR | Interrupt Flag Output | Push-pull active-high interrupt generated on semaphore change or write completion |
| M/S | Master/Slave Select | Configures device role in cascaded systems; enables error-free 32-bit+ word expansion |
| OEL / OER | Output Enable | Tri-states I/O pins independently per port; required for bus sharing with other peripherals |
| VCC / GND | Power Supply | Multiple VCC/GND pins ensure low-impedance distribution and noise immunity in high-speed operation |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous, independent read/write access to any memory location from both ports - eliminates arbitration wait states in real-time DSP or dual-CPU systems |
| On-Chip Semaphore Logic | Eight hardware semaphore flags accessible via A0–A2 and I/O0; provides atomic lock/unlock without software overhead or external latches |
| Master/Slave Cascading | Supports seamless 32-bit+ data bus expansion using BUSY flag handshaking - no discrete glue logic required for multi-device configurations |
| Battery Backup Retention | Maintains data integrity at 2V supply (ICCDR ≤ 4000 µA), enabling nonvolatile operation during main power loss in industrial controllers |
| Industrial Temperature Rating | Guaranteed operation from –40°C to +85°C with full AC/DC specifications - suitable for under-hood automotive ECUs and factory-floor PLCs |
| Low-Power Standby Mode | 0.2 mA typical ISB3 current with CMOS-level inputs - extends battery life in portable test equipment and remote sensor nodes |
Applications
| Real-Time Dual-Processor Communication | Digital Signal Processing Buffering |
|---|---|
Use Scenario: Two independent CPUs share status, command, and telemetry data with deterministic latency and no software-managed locks. IC Role / Device Role / Timing Role: Shared memory buffer with hardware semaphore arbitration and BUSY-flag-controlled write coordination. Use Value: Eliminates polling delays and race conditions; tAPS = 5 ns ensures priority resolution within one clock cycle of contention detection. |
Use Scenario: High-throughput audio/video processing pipeline where one core writes raw samples while another reads processed frames. IC Role / Device Role / Timing Role: Asynchronous dual-port frame buffer enabling zero-wait-state data handoff between processing stages. Use Value: 55 ns tRC supports >18 MHz sustained bandwidth; simultaneous read/write avoids FIFO bottlenecks in real-time media engines. |
| Industrial PLC I/O Mapping | Military Avionics Data Exchange |
Use Scenario: Programmable logic controller uses dual ports to isolate field I/O scanning (one port) from HMI/command updates (other port). IC Role / Device Role / Timing Role: Deterministic memory-mapped I/O interface with byte-selectable access (UBL/LBL) for 8-bit sensor/actuator registers. Use Value: UBL/LBL control enables direct mapping to legacy 8-bit peripheral buses; tABE ≤ 55 ns ensures scan cycle timing compliance. |
Use Scenario: Radar subsystem exchanges radar return data between signal processor and mission computer across safety-critical boundaries. IC Role / Device Role / Timing Role: Radiation-tolerant (QML-38535 compliant) shared memory with interrupt-driven semaphore signaling for cross-domain data transfer. Use Value: INTR flag provides immediate notification of new data arrival; tSWRD = 5 ns guarantees sub-cycle semaphore update-to-read 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 |
|---|---|---|---|
| CY7C024AV-55AXC | 55 ns access, 4K × 16, 3.3V supply, TQFP-100 package | Requires level-shifting in 5V systems; lacks battery backup mode and M/S cascading support | Select when migrating to 3.3V infrastructure and prioritizing smaller footprint over legacy 5V compatibility |
| IDT70V24L25PFI | 25 ns access, 4K × 16, 3.3V supply, PLCC-84, -40°C to +85°C | Faster speed but incompatible voltage; no 2V data retention; different pinout despite same package | Choose for higher bandwidth needs in new 3.3V designs where timing margin is critical and battery backup is unnecessary |
Compared with CY7C024AV-55AXC and IDT70V24L25PFI, the 7024L55JI8 uniquely combines 5V TTL compatibility, 2V battery retention, master/slave cascading, and industrial temperature rating in a drop-in PLCC-84 footprint - making it irreplaceable for sustaining legacy military and industrial control systems.
Availability
7024L55JI8 is available at Aetrix Electronics and suitable for real-time dual-processor communication, industrial PLC I/O mapping, and military avionics data exchange requiring stable component supply across extended product lifecycles.
Supply support for 7024L55JI8 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, RF, and sensor solutions, now part of Renesas Electronics.
The IDT7024 family was designed for high-reliability dual-processor and real-time control applications demanding deterministic arbitration, low-latency memory access, and robust industrial/military environmental operation.
FAQ
What is the maximum operating temperature range for the 7024L55JI8?
The 7024L55JI8 is rated for industrial temperature operation from –40°C to +85°C, with all DC and AC electrical specifications guaranteed across this range. This makes it suitable for deployment in harsh environments such as factory automation controllers, transportation systems, and outdoor communications infrastructure where ambient thermal stress is significant.
Does the 7024L55JI8 support battery backup operation, and what voltage is required?
Yes, the 7024L55JI8 supports battery backup data retention at VCC = 2.0 V minimum, with typical data retention current (ICCDR) of 100 µA and maximum of 4000 µA across the industrial temperature range. This feature enables nonvolatile memory preservation during main power failure in critical control and monitoring applications.
How does the Master/Slave (M/S) configuration work in the 7024L55JI8?
When M/S = HIGH, the 7024L55JI8 operates as a Master with BUSY output asserted during port contention; when M/S = LOW, it acts as a Slave with BUSY input used to stall writes until the Master releases the bus. This hardware-based arbitration enables seamless cascading of multiple devices for 32-bit+ word systems without external logic.
What is the function of the semaphore logic in the 7024L55JI8?
The 7024L55JI8 includes eight hardware semaphore flags accessed via A0–A2 addressing and controlled by SEML/SEMR. Writing to I/O0 sets a flag; reading returns the flag state across all 16 I/O lines. This provides atomic, lock-free inter-processor synchronization - eliminating software race conditions in dual-CPU or DSP+host architectures.
Which package type is used by the 7024L55JI8, and is it compatible with standard PLCC sockets?
The 7024L55JI8 uses an 84-pin Plastic Leaded Chip Carrier (PLCC-84) package with JEDEC MO-047 outline and 1.15 in × 1.15 in body size. It is mechanically and electrically compatible with industry-standard PLCC-84 sockets, supporting easy prototyping, rework, and long-term field replacement in legacy industrial and defense systems.
7024L55JI8 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 84-PLCC (29.31x29.31)
7024L55JI8 FAQ
1.How can I place an order for 7024L55JI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7024L55JI8 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 7024L55JI8 reliable?
The price and inventory of 7024L55JI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7024L55JI8 is usually 5 days.
3.What payment methods are accepted for 7024L55JI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7024L55JI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7024L55JI8?
7024L55JI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7024L55JI8 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 7024L55JI8?
For technical support, including 7024L55JI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7024L55JI8 requirements.
6.How does Aetrix verify that 7024L55JI8 is sourced from the original manufacturer or authorized distributors?
All 7024L55JI8 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 7024L55JI8 meets industry standards.
7.What is the process for return or replacement of 7024L55JI8?
All 7024L55JI8 units undergo pre-shipment inspection (PSI). If there is an issue with 7024L55JI8, 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 7024L55JI8 part is unused and in its original packaging.
Return procedure for 7024L55JI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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