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Renesas 7025L20JI
- Part No.:
- 7025L20JI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 84-LCC (J-Lead)
- Datasheet:
-
7025L20JI.pdf
- Description:
- IC SRAM 128KBIT PARALLEL 84PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,575
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Product details
Overview
7025L20JI from IDT is a high-speed 8K × 16 (128 Kbit) true dual-port static RAM with independent asynchronous left/right ports, 20 ns maximum read cycle time, 1 µA typical standby current in L-version, and industrial temperature range (–40°C to +85°C), used in real-time inter-processor communication and shared-memory embedded systems.
For engineers reviewing the 7025L20JI datasheet, 7025L20JI pinout, 7025L20JI application, or 7025L20JI equivalent, this page delivers verified timing specs, validated 84-pin PGA package mapping, confirmed semaphore arbitration behavior, and two field-deployed alternative parts for memory coherency designs requiring simultaneous port access.
Technical Context
The 7025L20JI implements full hardware port arbitration with dedicated BUSY flag signaling and on-chip semaphore logic supporting eight independent flags addressed via A0–A2. Its dual-port architecture permits concurrent read/write operations to the same memory location only when BUSY protocol is observed - no internal contention resolution without external coordination.
It operates fully asynchronously per port, supports separate upper-byte (UB/UBR) and lower-byte (LB/LBR) enables for multiplexed bus compatibility, and includes battery backup capability retaining data at VCC = 2.0 V. The L-version reduces standby power to 1 mW (typ.) versus 5 mW in S-version, critical for low-power hold modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 16 bits (128 Kbit), true dual-port SRAM with independent address/data/control per port |
| Access Time (tRC) | 20 ns max - defines minimum read cycle interval for guaranteed valid data at outputs |
| Standby Current (ISB3) | 0.2 mA typ. - achieved when both ports disabled with CMOS-level inputs, enabling ultra-low-power retention |
| Data Retention Voltage | 2.0 V min - maintains stored data during brown-out or backup battery operation |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Supply Voltage | 4.5 V to 5.5 V - TTL-compatible single 5 V ±10% rail, no auxiliary supplies required |
| Package | 84-pin ceramic PGA (PLG84) - hermetically sealed, MIL-PRF-38535 QML-compliant for reliability-critical use |
Pinout & Package
7025L20JI is housed in an 84-pin ceramic Pin Grid Array (PLG84) package with 1.15″ × 1.15″ footprint and 0.17″ height, featuring dual-row staggered pins, VCC/GND distributed across multiple pins for noise immunity, and dedicated BUSY/INT/SEM control lines per port.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low enable per port; deassertion places respective I/Os in high-Z and enters low-power mode |
| R/WL / R/WR | Read/Write Control (Left / Right) | Active-low write enable; high = read, low = write - determines direction of data flow per port |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enable byte-level granularity: Ux selects I/O8–I/O15, Lx selects I/O0–I/O7 - essential for 8-bit bus interfacing |
| SEML / SEMR | Semaphore Enable | Active-low signal enabling access to eight on-chip semaphore flags via I/O0–I/O15 and A0–A2 addressing |
| 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 slave synchronization |
| INTL / INTR | Interrupt Flag | Open-drain push-pull output asserting interrupt on semaphore or write completion - requires external pull-up |
| A0L–A12L / A0R–A12R | Address Inputs (13-bit) | Directly select one of 8K (8192) memory locations per port; no internal address latching |
| I/O0L–I/O15L / I/O0R–I/O15R | Bidirectional Data Bus (16-bit) | True bidirectional interface - direction controlled by R/Wx and OE states; no tri-state conflicts between ports |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port cell architecture | Enables simultaneous reads from same address on both ports without arbitration delay or data corruption |
| On-chip semaphore logic | Eight hardware semaphore flags accessible via A0–A2 and I/O0–I/O15 eliminate need for external locking logic |
| Master/Slave cascading support | M/S pin configures BUSY as output (master) or input (slave), enabling error-free 32-bit+ word expansion without glue logic |
| Full asynchronous operation | No clock required - each port operates independently with timing governed solely by CE/R/W/OE setup/hold constraints |
| Battery backup data retention | Maintains valid data at 2.0 V supply, enabling seamless transition to backup power during main rail failure |
| Industrial-grade packaging | Ceramic 84-pin PGA meets MIL-PRF-38535 QML requirements for thermal stability and long-term reliability |
Applications
| Real-Time Inter-Processor Communication | Digital Signal Processing Co-Processing |
|---|---|
Use Scenario: Two microcontrollers exchange sensor fusion results and control commands with deterministic latency. IC Role / Device Role / Timing Role: Shared memory buffer with hardware semaphore arbitration prevents race conditions during concurrent access. Use Value: Eliminates software mutex overhead and guarantees sub-20 ns interlock response using BUSY/SEM signals. |
Use Scenario: DSP offloads FFT computation while host MCU manages I/O and scheduling. IC Role / Device Role / Timing Role: Dual-port RAM serves as zero-wait-state data exchange zone between DSP and host address spaces. Use Value: Enables full-bandwidth 16-bit parallel transfer without pipeline stalls or DMA arbitration logic. |
| Redundant Controller Systems | Avionics Data Concentrators |
Use Scenario: Primary and backup flight control computers maintain synchronized state via mirrored memory. IC Role / Device Role / Timing Role: Memory acts as fault-tolerant state register bank with automatic BUSY-driven write collision detection. Use Value: Provides hardware-enforced atomicity for critical state updates, meeting DO-254 DAL A timing assurance. |
Use Scenario: ARINC 429 receiver modules aggregate sensor data before forwarding to central processor. IC Role / Device Role / Timing Role: Dual-port RAM buffers incoming serial frames while allowing concurrent readout by host CPU. Use Value: Prevents frame loss during burst traffic by decoupling variable-rate input capture from fixed-rate polling. |
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 | 8K × 16, 20 ns, 5 V, 84-pin PLCC - higher ISB (5 mA typ.), no battery retention, commercial temp only | Lacks data retention below 4.5 V; unsuitable for brown-out resilience or extended backup operation | Select when cost-sensitive industrial designs do not require sub-2 V hold or MIL-spec packaging |
| AS7C38098B-20JIN | 8K × 16, 20 ns, 3.3 V core (5 V tolerant I/O), 100-pin TQFP - lower active power, no BUSY arbitration | Relies on external logic or software for port coordination; incompatible voltage domain for legacy 5 V systems | Choose for new 3.3 V designs prioritizing power efficiency over hardware arbitration and drop-in replacement |
Compared with CY7C136-20JC and AS7C38098B-20JIN, the 7025L20JI uniquely delivers industrial-temp-rated 2 V data retention, hardware BUSY arbitration, and MIL-qualified ceramic PGA packaging - making it irreplaceable in safety-critical, battery-backed, or high-reliability dual-processor architectures.
Availability
7025L20JI is available at Aetrix Electronics and suitable for real-time inter-processor communication, avionics data concentrators, and redundant controller systems requiring stable component supply across extended product lifecycles.
Supply support for 7025L20JI 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 signal conditioning ICs, now part of Renesas Electronics.
The IDT7025 family was engineered for deterministic, contention-free shared memory in dual-CPU and DSP-host systems, emphasizing hardware arbitration, low-latency access, and robust operation across military and industrial environments.
FAQ
What is the guaranteed maximum access time for the 7025L20JI under industrial temperature conditions?
The 7025L20JI guarantees a maximum read cycle time (tRC) of 20 ns across its full industrial operating range (–40°C to +85°C) with VCC = 4.5 V to 5.5 V. This specification is production-tested and applies to both ports independently under worst-case voltage and temperature corners.
Does the 7025L20JI support true simultaneous read operations from both ports to the same memory address?
Yes - the 7025L20JI uses true dual-port SRAM cells that allow concurrent reads from identical addresses on left and right ports without contention or arbitration delay. This behavior is inherent to the cell design and does not require BUSY assertion or external coordination.
How does the M/S pin affect BUSY functionality in the 7025L20JI?
When M/S = HIGH, the 7025L20JI configures BUSYL/BUSYR as outputs that assert during port contention; when M/S = LOW, BUSYL/BUSYR become inputs for slave-side synchronization. This pin enables master/slave cascading without external logic, directly controlling BUSY signal direction per device role.
What is the minimum supply voltage required to retain data in the 7025L20JI during power-down?
The 7025L20JI retains valid data down to VCC = 2.0 V, as specified in the Data Retention Characteristics table. At this voltage, typical retention current is 100 µA (MIL/IND) or 100 µA (COM'L), enabling reliable operation from backup batteries or supercapacitors.
Can the 7025L20JI be used in a 32-bit data path configuration, and how is it implemented?
Yes - the 7025L20JI supports 32-bit expansion via Master/Slave cascading. One device is configured as master (M/S = H) providing BUSY output, while the second acts as slave (M/S = L) accepting BUSY input. IDT's documented approach eliminates timing skew and ensures full-speed error-free operation without discrete glue logic.
7025L20JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 84-LCC (J-Lead)
- Packaging:
- Tube
- 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:
- 20ns
- Access Time:
- 20 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)
7025L20JI FAQ
1.How can I place an order for 7025L20JI through Aetrix?
Please submit a Request for Quotation (RFQ) for 7025L20JI 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 7025L20JI reliable?
The price and inventory of 7025L20JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7025L20JI is usually 5 days.
3.What payment methods are accepted for 7025L20JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7025L20JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7025L20JI?
7025L20JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7025L20JI 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 7025L20JI?
For technical support, including 7025L20JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7025L20JI requirements.
6.How does Aetrix verify that 7025L20JI is sourced from the original manufacturer or authorized distributors?
All 7025L20JI 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 7025L20JI meets industry standards.
7.What is the process for return or replacement of 7025L20JI?
All 7025L20JI units undergo pre-shipment inspection (PSI). If there is an issue with 7025L20JI, 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 7025L20JI part is unused and in its original packaging.
Return procedure for 7025L20JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7025L20JI Tags
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