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Renesas 7025S55JI
- Part No.:
- 7025S55JI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 84-LCC (J-Lead)
- Datasheet:
-
7025S55JI.pdf
- Description:
- IC SRAM 128KBIT PARALLEL 84PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,569
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Product details
Overview
IDT7025S55JI from Integrated Device Technology (IDT) is a high-speed 8K × 16 (128 Kbit) true dual-port static RAM with independent asynchronous left/right ports, 55 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It enables simultaneous read 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 IDT7025S55JI datasheet, IDT7025S55JI pinout, IDT7025S55JI application, or IDT7025S55JI equivalent, key selection considerations include BUSY-flag arbitration timing (tBAA ≤ 20 ns), semaphore-controlled inter-port synchronization, battery-backed data retention at 2V, and compatibility with 84-pin PGA/PLCC/Flatpack packages for legacy military-industrial designs.
Technical Context
The IDT7025S55JI implements full hardware port arbitration with dedicated BUSY flag logic and eight on-chip semaphore registers accessible via A0–A2. Its dual-port architecture allows concurrent read/write operations across independent address/data/control buses without external logic.
It supports two distinct operational modes: as a stand-alone 128 Kbit dual-port RAM or as a MASTER/SLAVE pair using M/S pin configuration-where M/S = H enables BUSY output (master), and M/S = L configures BUSY as input (slave)-enabling deterministic contention resolution in multi-processor shared-memory systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 16 bits (128 Kbit), true dual-port SRAM with fully independent left/right ports |
| Access Time (tRC) | 55 ns max - defines minimum read cycle duration for guaranteed valid data at outputs |
| Operating Voltage | 5.0 V ±10% - single TTL-compatible supply; no auxiliary voltage rails required |
| Temperature Range | –40°C to +85°C - qualified for industrial-grade reliability per datasheet Grade I |
| Data Retention | 2 V minimum - retains stored data during brown-out or backup-battery operation |
| Power (Active) | 155 mA typical (ICC) - corresponds to ~775 mW at 5 V, enabling thermal budget planning |
| Power (Standby) | 16 mA typical (ISB1) - low quiescent current when both ports disabled via CE high |
Pinout & Package
Package: 84-pin Ceramic Pin Grid Array (PGA), PLCC, or Flatpack - body size ≈ 1.15 in × 1.15 in × 0.17 in (PLG84); pin-compatible across these variants per datasheet Figure 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Asynchronous port enable; deassertion places respective port in high-Z standby |
| R/WL / R/WR | Read/Write Control (Left / Right) | Active-low write enable; high = read mode, low = write mode |
| OEL / OER | Output Enable (Left / Right) | Controls tri-state of I/O pins; independent from R/W for flexible bus sharing |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enables byte-level writes (I/O8–I/O15 or I/O0–I/O7) for multiplexed bus compatibility |
| SEML / SEMR | Semaphore Enable | Activates 8-register semaphore block for inter-port synchronization and resource locking |
| BUSYL / BUSYR | Busy Flag (Master Output / Slave Input) | Indicates port contention; asserted when both ports access same address simultaneously |
| M/S | Master/Slave Select | H = BUSY output (arbitration master); L = BUSY input (arbitration slave) |
| INTL / INTR | Interrupt Flag | Open-drain push-pull output signaling semaphore or memory event to host processor |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous reads/writes to same or different addresses without arbitration delay or pipeline stalls |
| Hardware Semaphore Logic | Eight dedicated registers accessed via A0–A2 allow atomic lock/unlock of shared resources between processors |
| Master/Slave Cascading | Supports 32-bit+ data bus expansion using M/S pin and BUSY handshaking-no glue logic required |
| Full Asynchronous Operation | Each port operates independently with no clock; timing governed solely by CE/R/W/OE setup/hold constraints |
| Battery Backup Support | Retains data at 2 V supply-critical for nonvolatile operation during main power loss |
Applications
| Real-Time Digital Signal Processing | Avionics Flight Control Systems |
|---|---|
Use Scenario: Two DSP cores share sensor data buffers and coefficient tables in a radar signal chain requiring zero-latency memory coherency. IC Role / Device Role / Timing Role: Dual-port SRAM acts as synchronized shared memory with hardware semaphore arbitration preventing race conditions during FFT buffer swaps. Use Value: Eliminates software polling or external arbitration logic; 55 ns tRC ensures sub-20 MHz processing loop timing compliance. |
Use Scenario: Redundant flight computers exchange state vectors and actuator commands via shared memory in DO-254-certified avionics hardware. IC Role / Device Role / Timing Role: IDT7025S55JI provides deterministic BUSY-flag-based port arbitration and interrupt-driven semaphore signaling for fail-safe cross-checking. Use Value: Industrial temp grade (–40°C to +85°C) and 55 ns timing meet RTCA/DO-160 environmental and latency requirements. |
| Industrial PLC Motion Controllers | Military Communications Radios |
Use Scenario: FPGA-based motion sequencer and ARM host CPU coordinate trajectory updates and encoder feedback in closed-loop servo drives. IC Role / Device Role / Timing Role: Acts as dual-access buffer for position setpoints (FPGA writes) and status logs (ARM reads), with byte-select for partial updates. Use Value: UBL/LBL control enables efficient 8-bit register writes without disturbing adjacent 16-bit data; 2V retention preserves critical fault logs during power cycling. |
Use Scenario: Secure SDR platform uses dual-core TMS320C66xx DSPs sharing encrypted waveform parameters and channel state tables. IC Role / Device Role / Timing Role: Provides radiation-tolerant (military-grade) shared memory with hardware semaphore protection against concurrent crypto key access. Use Value: Qualified to MIL-PRF-38535 QML standards; 55 ns access meets wideband IF sampling timing budgets in HF/VHF transceivers. |
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 3-state BUSY and lacks integrated semaphore logic | Requires external arbitration logic for semaphore functionality; less suitable for tightly coupled dual-processor sync | Select when BUSY signaling suffices and semaphores are implemented in firmware or FPGA |
| AS7C38097A-55JC | 55 ns, 8K × 16, CMOS-only interface (no TTL compatibility), lower active current (120 mA typ) | Not pin-compatible; requires level-shifting for legacy 5V TTL systems; no 2V data retention | Prefer for new low-power designs with clean 5V CMOS interfaces and no battery-backup requirement |
Compared with CY7C136-55JC and AS7C38097A-55JC, the IDT7025S55JI uniquely integrates hardware semaphore registers and supports 2V data retention-making it irreplaceable in safety-critical, battery-backed, or legacy TTL-mixed-signal systems where deterministic inter-processor coordination is mandatory.
Availability
IDT7025S55JI is available at Aetrix Electronics and suitable for real-time digital signal processing, avionics flight control systems, and industrial PLC motion controllers requiring stable component supply across extended product lifecycles.
Supply support for IDT7025S55JI 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
Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor signal conditioning ICs.
The IDT7025S55JI belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic shared-memory architectures in military, aerospace, and industrial real-time control systems.
FAQ
What is the operating temperature range for the IDT7025S55JI?
The IDT7025S55JI is rated for industrial temperature operation from –40°C to +85°C, as confirmed in the "Recommended DC Operating Conditions" table (Datasheet Table 5) and explicitly designated under Grade I qualification. This range supports deployment in harsh environments such as factory automation, outdoor communications equipment, and vehicle-mounted control units without derating.
Does the IDT7025S55JI support battery backup operation?
Yes, the IDT7025S55JI supports battery backup operation with guaranteed data retention down to 2.0 V (VDR), as specified in Datasheet Table 10. This feature enables nonvolatile storage during main power interruption, and is validated for all temperature grades including industrial (–40°C to +85°C).
How does the BUSY flag function in master vs. slave configuration on the IDT7025S55JI?
When M/S = H, the IDT7025S55JI operates as master: BUSYL/BUSYR are outputs asserting during port contention. When M/S = L, it operates as slave: BUSYL/BUSYR become inputs, allowing external master arbitration. This dual-role capability is defined in the Functional Block Diagram and Pin Names table (Datasheet pages 1 and 4).
What package types are available for the IDT7025S55JI?
The IDT7025S55JI is available in 84-pin ceramic PGA (PLG84), 84-pin PLCC, and 84-pin Flatpack packages, all mechanically and electrically compatible per datasheet Package Diagrams (pages 2–3). The "J" suffix in the part number denotes the ceramic PGA variant per IDT ordering conventions.
Can the IDT7025S55JI be used in a 32-bit data bus system?
Yes, the IDT7025S55JI supports 32-bit expansion via Master/Slave cascading: two devices are connected with M/S = H (master) and M/S = L (slave), using BUSY handshaking and dedicated CE/R/W controls to maintain full-speed error-free operation without additional discrete logic-explicitly described in the device Description section (page 2).
7025S55JI 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:
- 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)
7025S55JI FAQ
1.How can I place an order for 7025S55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for 7025S55JI 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 7025S55JI reliable?
The price and inventory of 7025S55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7025S55JI is usually 5 days.
3.What payment methods are accepted for 7025S55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7025S55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7025S55JI?
7025S55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7025S55JI 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 7025S55JI?
For technical support, including 7025S55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7025S55JI requirements.
6.How does Aetrix verify that 7025S55JI is sourced from the original manufacturer or authorized distributors?
All 7025S55JI 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 7025S55JI meets industry standards.
7.What is the process for return or replacement of 7025S55JI?
All 7025S55JI units undergo pre-shipment inspection (PSI). If there is an issue with 7025S55JI, 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 7025S55JI part is unused and in its original packaging.
Return procedure for 7025S55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7025S55JI Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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