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Renesas 7024S25JI8
- Part No.:
- 7024S25JI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 84-LCC (J-Lead)
- Datasheet:
-
7024S25JI8.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 84PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,525
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Product details
Overview
7024S25JI8 from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 25 ns maximum read cycle time (tRC), TTL-compatible 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports simultaneous asynchronous access, on-chip semaphore arbitration, and battery-backed data retention down to 2 V - enabling use in real-time inter-processor communication systems.
For engineers reviewing the 7024S25JI8 datasheet, 7024S25JI8 pinout, 7024S25JI8 application, or 7024S25JI8 equivalent, key selection considerations include its Master/Slave cascading capability for 32-bit+ bus expansion, BUSY flag arbitration logic, dual-byte (UB/LB) control for multiplexed bus compatibility, and low-power standby modes (1 mW typ. for L-version).
Technical Context
The 7024S25JI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, allowing concurrent read/write operations-even to the same memory location. Its on-chip arbitration logic resolves port contention via BUSY flag signaling and automatic priority resolution when M/S = H (Master) or L (Slave).
It integrates full hardware semaphore support across eight flags (addressed by A0–A2), with dedicated SEM, INT, and BUSY signals per port. The device operates in two distinct functional modes: RAM access (SEM = VIH) and semaphore register access (SEM = VIL), each with separate timing constraints and enable conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4,096 × 16-bit (64 Kbit), true dual-port SRAM |
| Max Read Cycle Time (tRC) | 25 ns - guarantees full-speed operation in 40 MHz synchronous bus interfaces |
| Supply Voltage | 5.0 V ±10% - compatible with standard TTL logic families without level-shifting |
| Data Retention Voltage | 2.0 V minimum - enables reliable battery backup during main power loss |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded control and communications equipment |
| Standby Current (ISB3) | 0.2 mA typical (L-version) - ultra-low power mode with CMOS-level inputs disabled |
| Package | 84-pin PLCC (J-lead) - surface-mount compatible with automated PCB assembly |
Pinout & Package
7024S25JI8 is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC), JEDEC MS-026AC compliant, with 0.050" lead pitch and body size ≈ 1.15 in × 1.15 in × 0.17 in. Pin 1 marked by notch; pin 1 corner located at top-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A11L | Left Port Address Inputs | 12-bit address bus for left-side memory access; supports full 4K addressing |
| A0R–A11R | Right Port Address Inputs | Independent 12-bit address bus for right-side access; no shared address lines |
| I/O0L–I/O15L | Left Port Bidirectional Data | 16-bit data path; direction controlled by R/WL and OE states |
| I/O0R–I/O15R | Right Port Bidirectional Data | Fully independent 16-bit data path; no bus contention between ports |
| CEL / CER | Chip Enable (Left/Right) | Active-low enables respective port; allows selective port power-down |
| R/WL / R/WR | Read/Write Control (Left/Right) | Active-low write enable; high = read or high-Z output state |
| OEL / OER | Output Enable (Left/Right) | Active-low enables data outputs; used with UB/LB for byte masking |
| UBL / UBR | Upper-Byte Select (Left/Right) | Enables I/O8–I/O15; supports 8-bit bus multiplexing and partial writes |
| LBL / LBR | Lower-Byte Select (Left/Right) | Enables I/O0–I/O7; enables byte-granular memory access |
| SEML / SEMR | Semaphore Enable (Left/Right) | Activates semaphore register access mode (SEM = VIL); disables RAM access |
| INTL / INTR | Interrupt Flag Output (Left/Right) | Open-drain push-pull output signals semaphore or error events |
| BUSYL / BUSYR | Busy Flag (Master Output / Slave Input) | When M/S = H: BUSY is output indicating port contention; when M/S = L: BUSY is input for arbitration coordination |
| M/S | Master/Slave Select | Configures device role in cascaded systems; determines BUSY signal direction and arbitration behavior |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Memory Cells | Enables simultaneous reads/writes to identical addresses - critical for lock-free inter-processor messaging |
| On-Chip Semaphore Logic | Eight hardware semaphore flags (A0–A2 addressed) eliminate need for external locking logic in multi-CPU systems |
| Master/Slave Cascading Support | Allows expansion to 32-bit+ data buses without external glue logic using BUSY flag handshaking |
| Full Asynchronous Operation | No clock required; all timing defined by setup/hold and access windows - simplifies timing closure in mixed-signal designs |
| Battery Backup Data Retention | Retains valid data at 2 V supply - enables seamless failover in power-critical telecom and industrial controllers |
Applications
| Telecom Line Card Buffering | Real-Time Industrial PLC |
|---|---|
Use Scenario: Dual-CPU architecture where DSP handles signal processing and ARM manages I/O and protocol stacks, sharing status and packet buffers. IC Role / Device Role / Timing Role: Shared memory buffer with hardware semaphore arbitration prevents race conditions during register updates and interrupt handling. Use Value: Eliminates software mutex overhead and guarantees sub-25 ns inter-processor data exchange latency. |
Use Scenario: Redundant controller pair performing hot-swappable logic execution with synchronized state snapshots. IC Role / Device Role / Timing Role: Dual-port SRAM acts as mirrored state store; one CPU writes while the other validates and checkpoints. Use Value: Enables deterministic <25 ns state synchronization without bus arbitration delays or external FIFOs. |
| Avionics Flight Control Interface | Digital Signal Processing Subsystem |
Use Scenario: Safety-critical flight computer exchanging sensor fusion results and actuator commands between primary and monitor processors. IC Role / Device Role / Timing Role: Hardware-arbitrated memory with BUSY flag ensures atomic read-modify-write of control registers under fault conditions. Use Value: Meets DO-254 Level A timing assurance requirements with zero software intervention in arbitration path. |
Use Scenario: Multi-DSP system where one processor loads coefficients while another executes FFT kernels on shared coefficient/data memory. IC Role / Device Role / Timing Role: Simultaneous read (DSP core) and write (DMA controller) to same memory block without pipeline stalls. Use Value: Sustains 40 MHz effective throughput with no wait states - doubling effective memory bandwidth vs. single-port alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1370D-250AXC | 3.3 V core, 250 MHz QDR interface, 18 Mb density; no built-in semaphore logic | Requires external arbitration logic; suited for high-bandwidth cache coherency, not real-time inter-processor sync | Select only if migrating to 3.3 V system with QDR controller and external semaphore management |
| AS7C34096A-25JC | Single-port 4M × 16 SRAM, 25 ns, 3.3 V; no dual-port or arbitration features | Cannot support simultaneous access; requires external dual-port bridge or FPGA logic | Consider only for cost-sensitive non-concurrent applications where arbitration is handled in software or FPGA |
Compared with CY7C1370D-250AXC and AS7C34096A-25JC, the 7024S25JI8 uniquely delivers integrated hardware semaphore arbitration, 5 V TTL compatibility, and true dual-port concurrency - making it irreplaceable in legacy industrial and avionics designs requiring deterministic, low-latency inter-processor communication without external logic.
Availability
7024S25JI8 is available at Aetrix Electronics and suitable for telecom line cards, industrial PLCs, avionics interfaces, and digital signal processing subsystems requiring stable component supply across extended product lifecycles.
Supply support for 7024S25JI8 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 high-performance interconnect solutions, now part of Renesas Electronics.
The 7024S25JI8 belongs to IDT's legacy high-speed dual-port SRAM family, designed specifically for deterministic inter-processor communication in real-time embedded systems where hardware arbitration and battery backup are mandatory.
FAQ
What is the operating voltage range for the 7024S25JI8?
The 7024S25JI8 operates from 4.5 V to 5.5 V (5.0 V ±10%) under active conditions. For data retention only, it maintains valid memory contents down to 2.0 V - enabling direct connection to a backup lithium battery without regulation. This dual-voltage capability is confirmed in Table 10 of the official datasheet and applies specifically to the L-version variant embodied in 7024S25JI8.
Does the 7024S25JI8 support simultaneous read operations on both ports to the same address?
Yes, the 7024S25JI8 uses true dual-port memory cells that allow concurrent reads from both left and right ports to identical addresses without contention or delay. This behavior is explicitly stated in the "Features" section and verified in Truth Table I - no BUSY assertion occurs during simultaneous reads, and output data is valid within tAA (25 ns max) on each port independently.
How does the Master/Slave (M/S) pin affect arbitration in the 7024S25JI8?
When M/S = H, the 7024S25JI8 operates as Master: BUSY is an output flag signaling port contention to external logic or a slave device. When M/S = L, it operates as Slave: BUSY becomes an input used to synchronize writes and prevent collisions. This dual-role configuration is fundamental to cascaded systems and is detailed in the Functional Block Diagram and Pin Names table for 7024S25JI8.
What package type is used for the 7024S25JI8?
The 7024S25JI8 uses an 84-pin Plastic Leaded Chip Carrier (PLCC) package, designated PLG84 in IDT documentation. Its mechanical dimensions are approximately 1.15 in × 1.15 in × 0.17 in, with J-lead construction suitable for reflow soldering. This matches the "J" suffix in the part number and is confirmed in the Pin Configurations section (drawing 2740 drw 02F).
Can the 7024S25JI8 be used in battery-backed applications?
Yes - the 7024S25JI8 (L-version) supports battery backup operation with guaranteed data retention at VCC = 2.0 V, drawing only 100 µA typical (up to 4 mA max) in retention mode. This capability is validated in Table 10 ("Data Retention Characteristics") and is intrinsic to the "L" designation in the part number, confirming its suitability for uninterruptible memory in industrial controllers and telecom infrastructure.
7024S25JI8 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:
- 25ns
- Access Time:
- 25 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)
7024S25JI8 FAQ
1.How can I place an order for 7024S25JI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7024S25JI8 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 7024S25JI8 reliable?
The price and inventory of 7024S25JI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7024S25JI8 is usually 5 days.
3.What payment methods are accepted for 7024S25JI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7024S25JI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7024S25JI8?
7024S25JI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7024S25JI8 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 7024S25JI8?
For technical support, including 7024S25JI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7024S25JI8 requirements.
6.How does Aetrix verify that 7024S25JI8 is sourced from the original manufacturer or authorized distributors?
All 7024S25JI8 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 7024S25JI8 meets industry standards.
7.What is the process for return or replacement of 7024S25JI8?
All 7024S25JI8 units undergo pre-shipment inspection (PSI). If there is an issue with 7024S25JI8, 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 7024S25JI8 part is unused and in its original packaging.
Return procedure for 7024S25JI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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