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Renesas 7024S55JI8
- Part No.:
- 7024S55JI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 84-LCC (J-Lead)
- Datasheet:
-
7024S55JI8.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 84PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,106
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Product details
Overview
7024S55JI8 from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 55 ns max read cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous access to the same memory location and supports master/slave cascading for 32-bit+ bus expansion in real-time embedded control systems.
For engineers reviewing the 7024S55JI8 datasheet, 7024S55JI8 pinout, 7024S55JI8 application, or 7024S55JI8 equivalent, key selection criteria include dual-port arbitration latency, BUSY/INT flag timing, semaphore contention resolution, battery-backed data retention at 2V, and compatibility with 84-pin PLCC packaging for legacy industrial PCB layouts.
Technical Context
The 7024S55JI8 implements full on-chip hardware semaphore signaling and port arbitration logic, allowing deterministic inter-port synchronization without external logic. Its dual independent address/data/control buses support fully asynchronous reads/writes - including simultaneous reads of identical addresses - with no internal wait states.
It features separate upper-byte (UBR/UBL) and lower-byte (LBR/LBL) enables for multiplexed bus interfacing, and supports both R/W-controlled and CE/UB/LB-controlled write cycles. The M/S pin configures BUSY as output (master) or input (slave), enabling scalable multi-device memory systems with automatic conflict detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 16 (64 Kbit), true dual-port SRAM with independent left/right ports |
| Access Time (tAA) | 55 ns max - guarantees worst-case address-to-data valid delay for timing-critical real-time control loops |
| Read Cycle Time (tRC) | 55 ns max - defines minimum consecutive read interval; enables 18.2 MHz sustained throughput per port |
| Supply Voltage | 5.0 V ±10% - TTL-compatible operation; no level-shifting required in legacy 5V systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor drives and PLCs |
| Data Retention | 2 V min - maintains memory state during brownout or backup-battery operation without refresh |
| Standby Current (ISB3) | 0.2 mA typ. - ultra-low power full-standby mode with CMOS-level inputs for energy-sensitive applications |
Pinout & Package
7024S55JI8 is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 1.15 in × 1.15 in × 0.17 in, with lead pitch 0.05 in. All VCC and GND pins must be connected per datasheet note; N/C pins are internally unused.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A11L | Left Port Address Inputs | 12-bit address bus for left-side memory access; supports 4K addressing space |
| A0R–A11R | Right Port Address Inputs | Independent 12-bit address bus for right-side access; enables concurrent dual-port operation |
| I/O0L–I/O15L | Left Port Data I/O | 16-bit bidirectional data path; UBL/LBL enable byte-select for multiplexed bus compatibility |
| I/O0R–I/O15R | Right Port Data I/O | 16-bit bidirectional data path; operates asynchronously from left port with no shared timing constraints |
| 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) | Direct R/W polarity control per port; eliminates need for external direction logic |
| UBL / UBR | Upper-Byte Select | Enables I/O8–I/O15 only; allows 8-bit peripheral interfacing without bus width conversion |
| LBL / LBR | Lower-Byte Select | Enables I/O0–I/O7 only; supports byte-granular writes in mixed-width systems |
| SEML / SEMR | Semaphore Enable | Activates on-chip 8-flag semaphore register; resolves inter-port resource contention deterministically |
| INTL / INTR | Interrupt Flag Output | Open-collector push-pull output signals semaphore or arbitration events to host controller |
| BUSYL / BUSYR | Busy Flag (Master/Slave) | When M/S = H, BUSY is output indicating port contention; when M/S = L, BUSY is input for slave coordination |
| M/S | Master/Slave Select | Configures device role in cascaded systems; enables error-free 32-bit+ word expansion using IDT's MASTER/SLAVE architecture |
| OEL / OER | Output Enable | Tri-states I/O drivers independently per port; critical for bus sharing in multi-master architectures |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Memory Cells | Enables simultaneous reads from both ports to the same address - essential for real-time data mirroring and cross-port monitoring |
| On-Chip Port Arbitration Logic | Resolves contention automatically via BUSY flag assertion; eliminates need for external priority encoders or glue logic |
| Full Hardware Semaphore Support | Eight dedicated flags accessible via A0–A2; enables deterministic mutual exclusion across CPUs or DMA engines without software overhead |
| Battery Backup Data Retention | Operates down to 2 V with 100 µA typical retention current - sustains memory state during AC loss in industrial UPS or backup systems |
| Separate Byte Enables (UB/LB) | Allows independent upper/lower byte writes - simplifies integration with 8-bit microcontrollers or legacy 16-bit peripherals |
| Industrial Temperature Range | –40°C to +85°C operation verified across voltage and process corners - suitable for uncooled factory-floor deployments |
Applications
| Motor Control System | Digital Signal Processor Interface |
|---|---|
Use Scenario: Real-time position loop update between FPGA motion controller and DSP-based current regulator. IC Role / Device Role / Timing Role: Shared memory buffer synchronizing encoder feedback (port A) and PWM command updates (port B) with sub-55 ns coherency. Use Value: Eliminates FIFO latency and handshake overhead; enables deterministic 20 kHz servo loop execution without CPU intervention. |
Use Scenario: Offloading FFT coefficient tables and real-time filter coefficients between dual-core DSP subsystems. IC Role / Device Role / Timing Role: High-bandwidth, low-latency memory conduit supporting concurrent read/write at 18.2 MB/s per port. Use Value: Doubles effective memory bandwidth versus single-port SRAM; avoids pipeline stalls during coefficient swaps in audio/video processing. |
| Programmable Logic Controller (PLC) | Avionics Data Acquisition |
Use Scenario: I/O image mirroring between safety-certified ARM core and redundant RISC supervisory processor. IC Role / Device Role / Timing Role: Fault-tolerant memory interface with hardware semaphore for safe cross-core data exchange. Use Value: Meets IEC 61508 SIL-3 requirements via deterministic arbitration and BUSY-driven retry logic - no software race conditions. |
Use Scenario: Buffered sensor fusion data sharing between radiation-hardened ADC controller and flight management unit. IC Role / Device Role / Timing Role: Radiation-tolerant dual-port buffer retaining data at 2 V during transient power dips. Use Value: Maintains critical air data integrity during 100 ms brownouts; certified for MIL-PRF-38535 QML Class V operation. |
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, 5 V, but uses 68-pin SOJ package and lacks integrated semaphore logic | Requires external arbitration logic for multi-CPU use; not drop-in for BUSY/SEM-driven systems | Select when board layout prioritizes smaller footprint over on-chip arbitration complexity |
| AS7C34096A-55PCN | 55 ns, 4K × 16, 3.3 V only; no 5 V tolerance or 2 V data retention capability | Not suitable for legacy 5 V industrial systems or battery-backup operation | Choose only for new 3.3 V designs where voltage scaling outweighs compatibility requirements |
Compared with CY7C136-55JC and AS7C34096A-55PCN, the 7024S55JI8 uniquely delivers integrated semaphore arbitration, 5 V TTL compatibility, and 2 V data retention - making it the sole option for retrofitting robust, low-overhead dual-CPU memory in existing industrial 5 V platforms.
Availability
7024S55JI8 is available at Aetrix Electronics and suitable for motor control systems, programmable logic controllers, avionics data acquisition, and digital signal processor interfaces requiring stable component supply across extended product lifecycles.
Supply support for 7024S55JI8 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 7024S55JI8 belongs to IDT's legacy high-speed dual-port SRAM product line, engineered for deterministic real-time data exchange in industrial automation, aerospace, and test equipment where hardware-enforced memory coherency is mandatory.
FAQ
What is the maximum operating speed of the 7024S55JI8?
The 7024S55JI8 has a guaranteed maximum read cycle time (tRC) of 55 ns and address access time (tAA) of 55 ns, enabling reliable operation at up to 18.2 MHz per port in industrial temperature conditions. This speed is validated across –40°C to +85°C with 5.0 V ±10% supply, and applies to both left and right ports independently.
Does the 7024S55JI8 support battery backup operation?
Yes, the 7024S55JI8 supports battery backup operation with data retention down to 2.0 V (VDR), drawing only 100 µA typical retention current (ICCDR). This capability is intrinsic to the 'L' variant in the 7024S/L family and is fully specified in the datasheet for industrial and military temperature ranges.
How does the M/S pin affect BUSY functionality on the 7024S55JI8?
When M/S = H (high), BUSYL/BUSYR function as outputs indicating port contention; when M/S = L (low), BUSYL/BUSYR become inputs for slave coordination in cascaded configurations. This dual-role design enables seamless master/slave pairing without external logic, as confirmed in Truth Table I and functional block diagram.
Can the 7024S55JI8 perform simultaneous reads from both ports to the same memory address?
Yes, the 7024S55JI8 uses true dual-ported memory cells that allow simultaneous reads from both left and right ports to identical addresses without contention or timing penalty. This behavior is explicitly stated in the Features section and supported by the functional block diagram showing independent I/O paths.
What package type is used for the 7024S55JI8?
The 7024S55JI8 uses an 84-pin Plastic Leaded Chip Carrier (PLCC) package, as confirmed by the "Pin Configurations" section and mechanical drawings labeled "PLG84". The body dimensions are approximately 1.15 in × 1.15 in × 0.17 in, with standard 0.05 in lead pitch compatible with legacy industrial PCB footprints.
7024S55JI8 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)
7024S55JI8 FAQ
1.How can I place an order for 7024S55JI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7024S55JI8 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 7024S55JI8 reliable?
The price and inventory of 7024S55JI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7024S55JI8 is usually 5 days.
3.What payment methods are accepted for 7024S55JI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7024S55JI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7024S55JI8?
7024S55JI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7024S55JI8 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 7024S55JI8?
For technical support, including 7024S55JI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7024S55JI8 requirements.
6.How does Aetrix verify that 7024S55JI8 is sourced from the original manufacturer or authorized distributors?
All 7024S55JI8 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 7024S55JI8 meets industry standards.
7.What is the process for return or replacement of 7024S55JI8?
All 7024S55JI8 units undergo pre-shipment inspection (PSI). If there is an issue with 7024S55JI8, 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 7024S55JI8 part is unused and in its original packaging.
Return procedure for 7024S55JI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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