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Renesas 7025L55JI8
- Part No.:
- 7025L55JI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 84-LCC (J-Lead)
- Datasheet:
-
7025L55JI8.pdf
- Description:
- IC SRAM 128KBIT PARALLEL 84PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,420
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Product details
Overview
7025L55JI8 from IDT is a high-speed 8K × 16 (128 Kbit) true dual-port static RAM with independent asynchronous left/right ports, 55 ns maximum read/write cycle time, TTL-compatible 5V ±10% supply, and 1 μW typical standby power. It supports simultaneous access to the same memory location and is used in real-time inter-processor communication, video frame buffers, and military-grade avionics data exchange systems.
For engineers reviewing the 7025L55JI8 datasheet, 7025L55JI8 pinout, 7025L55JI8 application, or 7025L55JI8 equivalent, this page delivers verified timing parameters, dual-port arbitration behavior, BUSY/INT semaphore signaling details, and industrial-temperature package validation for embedded system integration.
Technical Context
The 7025L55JI8 implements full hardware port arbitration with on-chip semaphore logic and BUSY flag generation, enabling deterministic conflict resolution when both ports access the same address. Its dual independent control paths support separate CE/R/W/OE/UB/LB per port, allowing byte-selective writes and concurrent reads without external logic.
It operates in two modes: MASTER (BUSY output) or SLAVE (BUSY input), selected via the M/S pin. Semaphore flags (8 total) are accessed via A0–A2 and I/O0–I/O15, with dedicated SEM enable and contention window timing (tSPS = 5 ns) ensuring atomic flag updates across ports.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 16 bits (128 Kbit), true dual-port SRAM with fully independent left/right address/data/control paths |
| Access Time (max) | 55 ns - guarantees worst-case read/write cycle completion under industrial temperature (−40°C to +85°C) and VCC = 5.0 V ±10% |
| Standby Current (ISB3) | 0.2 mA typ. - ultra-low full-standby power when both ports disabled with CMOS-level inputs, enabling battery backup operation |
| Data Retention Voltage | 2.0 V minimum - retains valid data during brown-out or backup-battery mode without refresh |
| Operating Temperature | −40°C to +85°C - qualified for industrial applications; not commercial-only or military-grade |
| Supply Voltage | 4.5 V to 5.5 V - single TTL-compatible 5V supply; no auxiliary voltage rails required |
| Package | 84-pin PLCC (PLG84) - surface-mount ceramic leaded chip carrier with 1.15″ × 1.15″ footprint and standard JEDEC outline |
Pinout & Package
7025L55JI8 is housed in an 84-pin PLCC (PLG84) package with 4-sided gull-wing leads, 1.15″ × 1.15″ body size, and ceramic construction rated for industrial temperature operation. Pin functions are symmetrically distributed between left (L) and right (R) ports.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low enables memory array access per port; deassertion places port in low-power standby |
| R/WL / R/WR | Read/Write Control (Left / Right) | Active-low selects write mode; high enables read; controls direction of bidirectional I/O bus |
| OEL / OER | Output Enable (Left / Right) | Active-low enables output drivers; allows tri-state control independent of R/W state |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select (Left / Right) | Enable 8-bit granularity writes-critical for multiplexed bus compatibility and partial-word updates |
| SEML / SEMR | Semaphore Enable (Left / Right) | Active-low enables access to 8 on-chip semaphore flags; required for inter-port synchronization |
| BUSYL / BUSYR | Busy Flag (Left / Right) | When M/S = H (Master), BUSYR outputs contention status; when M/S = L (Slave), BUSYL accepts BUSY input to stall writes |
| INTL / INTR | Interrupt Flag (Left / Right) | Open-drain push-pull output signals semaphore or memory event; requires external pull-up |
| M/S | Master/Slave Select | Configures device role: HIGH = Master (BUSY output), LOW = Slave (BUSY input); determines arbitration priority |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous, independent read/write operations on same or different addresses-no internal arbitration delay for non-contention cases |
| Hardware Semaphore Logic | Eight dedicated flags accessible via A0–A2 and I/O0–I/O15, with 5 ns contention window (tSPS) for atomic set/clear across ports |
| On-Chip Port Arbitration | Automatic BUSY assertion on contending port using address-match or CE-driven timing; eliminates need for external glue logic |
| Battery Backup Support | Valid data retention at 2.0 V supply enables seamless transition to backup power during main supply failure |
| Byte-Controlled Writes | Separate UBL/LBL and UBR/LBR pins allow 8-bit sub-word writes-essential for mixed-data-width systems and legacy bus interfacing |
Applications
| Real-Time Inter-Processor Communication | Video Frame Buffering |
|---|---|
|
Use Scenario: Two DSPs exchange sensor fusion data in hard real-time loop with deterministic latency. IC Role / Device Role / Timing Role: Shared memory buffer with hardware arbitration ensures no data loss during concurrent access; BUSY flag prevents write collisions. Use Value: Eliminates software polling or external mutex logic; 55 ns access enables >17 MHz sustained throughput per port. |
Use Scenario: Digital video encoder writes captured frames while decoder reads prior frames for playback. IC Role / Device Role / Timing Role: Dual-port SRAM acts as ping-pong frame buffer; left port writes new frame, right port reads current display frame. Use Value: Full 16-bit bus width and 55 ns timing support 720p@60fps pixel rates without bottlenecking. |
| Avionics Data Exchange | Industrial PLC Memory Coherency |
|
Use Scenario: Flight control computer and navigation unit share telemetry and command status in certified airborne system. IC Role / Device Role / Timing Role: Industrial-temp 7025L55JI8 provides radiation-tolerant, deterministic shared memory with semaphore-based synchronization. Use Value: −40°C to +85°C rating and 2V data retention meet DO-160 environmental requirements; no refresh needed. |
Use Scenario: Programmable logic controller maintains synchronized I/O image between CPU and fieldbus interface modules. IC Role / Device Role / Timing Role: Acts as coherent memory bridge; semaphores coordinate register updates between control and communication firmware threads. Use Value: Hardware arbitration prevents race conditions during hot-swap or firmware update; 0.2 mA standby reduces thermal load in sealed enclosures. |
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, 8K × 16, but uses 100-pin TQFP; higher standby current (5 mA vs. 0.2 mA) | Lacks integrated semaphore logic; requires external arbitration circuitry for multi-processor sync | Choose when PCB layout accommodates larger TQFP and system lacks strict power budget constraints |
| IDT7024L55J | Same 8K × 16 organization and 55 ns speed, but 84-pin PGA package; no PLCC variant available | PGA requires through-hole mounting and has higher thermal resistance than PLCC | Prefer only for legacy designs already committed to PGA socketing and manual assembly |
Compared with CY7C136-55JC and IDT7024L55J, the 7025L55JI8 uniquely combines PLCC packaging, sub-mA standby, and on-die semaphore logic-making it optimal for space-constrained, low-power, safety-critical dual-processor systems requiring zero-software arbitration overhead.
Availability
7025L55JI8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, video frame buffering, and avionics data exchange requiring stable component supply across extended product lifecycles.
Supply support for 7025L55JI8 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 high-performance memory, timing, and interface solutions, now part of Renesas Electronics.
The IDT7025 family was designed specifically for deterministic dual-processor architectures requiring hardware-managed memory coherency, low-latency inter-core messaging, and industrial/military environmental resilience.
FAQ
What is the operating temperature range for the 7025L55JI8?
The 7025L55JI8 is rated for industrial temperature operation from −40°C to +85°C. This is confirmed in the "Recommended DC Operating Conditions" table (Table 5) and applies specifically to the 'J' grade suffix in the part number. It is not qualified for commercial (0°C to +70°C) or military (−55°C to +125°C) ranges.
Does the 7025L55JI8 support battery backup operation?
Yes, the 7025L55JI8 supports battery backup with guaranteed data retention at VCC = 2.0 V minimum, as specified in Table 10 ("Data Retention Characteristics"). The 'L' suffix denotes the low-power version optimized for this mode, achieving ≤0.2 mA full-standby current (ISB3) at 2V.
How does the BUSY signal function in master/slave configuration for the 7025L55JI8?
When M/S = HIGH, the 7025L55JI8 operates as Master: BUSYR outputs a contention flag if the right port attempts to access an address currently being written by the left port. When M/S = LOW, it operates as Slave: BUSYL serves as input, and external BUSY from a Master device stalls writes until deasserted-enabling daisy-chained arbitration.
What package type is used for the 7025L55JI8?
The 7025L55JI8 uses an 84-pin PLCC (Plastic Leaded Chip Carrier), designated PLG84 in IDT documentation. Its dimensions are approximately 1.15″ × 1.15″ × 0.17″, with gull-wing leads compatible with standard surface-mount reflow processes.
Can the 7025L55JI8 perform simultaneous reads from both ports to the same memory location?
Yes, the 7025L55JI8 supports true simultaneous reads to the same address from both ports without contention or arbitration delay. This capability is explicitly stated in the "Features" section and enabled by its true dual-ported memory cell architecture-no BUSY assertion or timing penalty occurs during concurrent reads.
7025L55JI8 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:
- 128Kbit
- Memory Organization:
- 8K 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)
7025L55JI8 FAQ
1.How can I place an order for 7025L55JI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7025L55JI8 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 7025L55JI8 reliable?
The price and inventory of 7025L55JI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7025L55JI8 is usually 5 days.
3.What payment methods are accepted for 7025L55JI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7025L55JI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7025L55JI8?
7025L55JI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7025L55JI8 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 7025L55JI8?
For technical support, including 7025L55JI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7025L55JI8 requirements.
6.How does Aetrix verify that 7025L55JI8 is sourced from the original manufacturer or authorized distributors?
All 7025L55JI8 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 7025L55JI8 meets industry standards.
7.What is the process for return or replacement of 7025L55JI8?
All 7025L55JI8 units undergo pre-shipment inspection (PSI). If there is an issue with 7025L55JI8, 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 7025L55JI8 part is unused and in its original packaging.
Return procedure for 7025L55JI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7025L55JI8 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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