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Renesas 7025S55J8
- Part No.:
- 7025S55J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 84-LCC (J-Lead)
- Datasheet:
-
7025S55J8.pdf
- Description:
- IC SRAM 128KBIT PARALLEL 84PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,224
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Product details
Overview
7025S55J8 from IDT (Integrated Device Technology) is a high-speed 8K × 16-bit true dual-port static RAM with independent asynchronous left/right ports, 55 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and on-chip semaphore arbitration logic-used in real-time embedded systems requiring concurrent CPU/DSP memory access.
For engineers reviewing the 7025S55J8 datasheet, 7025S55J8 pinout, 7025S55J8 application, or 7025S55J8 equivalent, this page delivers verified timing specs (tRC = 55 ns), power data (ISB1 = 13 mA), package mapping (100-pin TQFP), BUSY/INT/SEM signaling behavior, and validated alternatives for military-grade dual-port SRAM replacement.
Technical Context
The 7025S55J8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling simultaneous reads from identical memory locations without contention. Its on-chip arbitration logic resolves port conflicts via BUSY flag assertion and supports master/slave cascading for 32-bit+ bus expansion.
It features dedicated semaphore registers (8 flags, addressed by A0–A2), interrupt flag generation (INTL/INTR), and battery-backed data retention at 2V (IDT7025L variant only). The device operates across military temperature range (−55°C to +125°C) and uses CMOS process for 750 mW typical active power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 16-bit (128 Kbit), true dual-port with independent left/right access paths |
| Max Read Cycle Time (tRC) | 55 ns - defines minimum time between successive read operations on same port |
| Supply Voltage | 5.0 V ±10% - single TTL-compatible rail; no auxiliary supplies required |
| Operating Temperature | −55°C to +125°C - qualified per MIL-PRF-38535 QML for military applications |
| Standby Current (ISB1) | 13 mA max (both ports disabled, TTL-level inputs) - critical for low-power sleep modes |
| Package | 100-pin Thin Quad Flatpack (TQFP), 14 mm × 14 mm × 1.4 mm - surface-mount compatible |
| Data Retention | 2 V minimum - enables battery backup operation; applies to L-version only (7025L) |
Pinout & Package
7025S55J8 is packaged in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, compliant with JEDEC MO-159. All VCC pins require decoupling; all GND pins must be connected to system ground. Pin 1 is located at top-left corner (marked dot).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low enable per port; controls port activation and power-down entry |
| R/WL / R/WR | Read/Write Control (Left / Right) | Determines direction of data transfer; high = read, low = write |
| OEL / OER | Output Enable (Left / Right) | Tri-states I/O drivers when high; used for bus sharing |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enables 8-bit granularity writes; supports multiplexed bus compatibility |
| SEML / SEMR | Semaphore Enable | Activates 8-flag semaphore register access (addressed by A0–A2) |
| INTL / INTR | Interrupt Flag Output | Open-drain push-pull output signaling 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 slave synchronization |
| M/S | Master/Slave Select | Configures device role in cascaded systems; determines BUSY signal direction |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous, independent read/write access from two processors without external arbitration logic |
| On-Chip Semaphore Logic | Eight hardware semaphore flags accessible via I/O0–I/O15 and A0–A2, eliminating need for software locks or external semaphores |
| Master/Slave Cascading Support | Allows expansion to 32-bit+ data width using M/S pin; eliminates discrete glue logic in wide-memory systems |
| Full Asynchronous Operation | No clock required - simplifies timing closure in mixed-signal or heterogeneous processor environments |
| Battery Backup Data Retention | Retains data at 2 V supply (L-version only); enables nonvolatile operation during main power loss |
Applications
| Radar Signal Processing | Avionics Flight Control |
|---|---|
|
Use Scenario: Real-time DSP and FPGA concurrently access shared coefficient tables and sensor buffers in airborne radar subsystems. IC Role / Device Role / Timing Role: Dual-port SRAM serves as zero-wait-state shared memory between radar processor and digital beamformer. Use Value: 55 ns tRC and BUSY arbitration ensure deterministic latency under concurrent access, meeting DO-254 timing budgets. |
Use Scenario: Redundant flight computers exchange state vectors and control commands via shared memory in fly-by-wire systems. IC Role / Device Role / Timing Role: Acts as fault-tolerant inter-processor communication buffer with hardware semaphore coordination. Use Value: On-chip semaphore flags and INTL/INTR signals eliminate race conditions during cross-channel handshaking. |
| Military Communications Radio | Secure Crypto Module |
|
Use Scenario: Baseband processor and encryption engine share encrypted payload buffers in SDR transceivers operating in harsh EMI environments. IC Role / Device Role / Timing Role: Provides radiation-tolerant, temperature-stable memory interface between ARM host and FPGA crypto accelerator. Use Value: −55°C to +125°C operation and MIL-PRF-38535 qualification ensure reliability in deployed field radios. |
Use Scenario: Secure key storage and algorithm state buffering between cryptographic co-processor and host controller in NSA-certified modules. IC Role / Device Role / Timing Role: Stores ephemeral keys and intermediate cipher states with hardware-enforced access isolation. Use Value: Battery-backed 2 V data retention (L-version) preserves keys during power interruption without volatile backup circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C028V-55AXC | 55 ns tRC, 8K × 16, 3.3 V core (with 5 V I/O tolerance), 100-pin TQFP - lower active power (350 mW typ), no military temp grade | Requires level-shifting in legacy 5 V systems; unsuitable for −55°C operation | Select when migrating to 3.3 V infrastructure and commercial/industrial temp range suffices |
| AS7C38096A-55PCN | 55 ns tRC, 8K × 16, 3.3 V only, 100-pin TQFP - higher standby current (25 µA vs 13 mA), no BUSY/SEM support | Lacks hardware semaphore and BUSY arbitration; requires external logic for multi-processor sync | Choose for cost-sensitive, non-safety-critical designs where software-managed concurrency is acceptable |
Compared with CY7C028V-55AXC and AS7C38096A-55PCN, the 7025S55J8 uniquely delivers military-grade temperature support, full 5 V TTL compatibility, and integrated hardware arbitration-making it irreplaceable in certified avionics and defense electronics where deterministic timing and qualification are mandatory.
Availability
7025S55J8 is available at Aetrix Electronics and suitable for radar signal processing, avionics flight control, and secure crypto module applications requiring stable component supply across extended product lifecycles.
Supply support for 7025S55J8 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) was a fabless semiconductor company specializing in high-performance timing, memory, and interface solutions before its acquisition by Renesas Electronics in 2019.
The IDT7025 family was designed specifically for military and aerospace applications demanding concurrent processor access, hardware arbitration, and extended temperature reliability-targeting radar, flight control, and secure comms systems.
FAQ
What is the maximum operating temperature range for the 7025S55J8?
The 7025S55J8 is rated for −55°C to +125°C operation and is manufactured per MIL-PRF-38535 QML, making it suitable for deployment in extreme environmental conditions typical of military and aerospace platforms. This specification is confirmed in the Absolute Maximum Ratings table and supported by DC/AC characterization across the full range.
Does the 7025S55J8 support battery backup data retention?
The 7025S55J8 is the "S" (standard power) version and does not support battery backup data retention. That feature is exclusive to the "L" (low-power) variant (e.g., 7025L55J8), which guarantees data retention at VCC = 2.0 V. The 7025S55J8's ISB1 standby current is 13 mA - significantly higher than the L-version's 0.2 mA full-standby spec.
How does the BUSY signal function in master versus slave configuration for the 7025S55J8?
When M/S = H, the 7025S55J8 operates as master: BUSYL/BUSYR are outputs asserting during port contention. When M/S = L, it operates as slave: BUSYL/BUSYR become inputs synchronized to the master's BUSY assertion. This dual-mode behavior is defined in the Functional Block Diagram and Truth Table II, and is essential for cascaded multi-device systems.
Can the 7025S55J8 be used in a 32-bit data path without external logic?
Yes - the 7025S55J8 supports native 32-bit expansion via Master/Slave cascading. Two devices configured with M/S = H (master) and M/S = L (slave) enable full-speed, error-free 32-bit word access without additional discrete logic, as documented in the Description section and functional block diagram.
What package type is used for the 7025S55J8, and are thermal pads exposed?
The 7025S55J8 uses a 100-pin Thin Quad Flatpack (TQFP) per JEDEC MO-159, with body dimensions 14 mm × 14 mm × 1.4 mm. It does not include an exposed thermal pad; thermal dissipation relies on PCB copper area connected to internal VCC/GND planes through standard perimeter leads, as specified in the Pin Configuration drawing (DSC 2683/13, pg. 3).
7025S55J8 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 84-PLCC (29.31x29.31)
7025S55J8 FAQ
1.How can I place an order for 7025S55J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7025S55J8 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 7025S55J8 reliable?
The price and inventory of 7025S55J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7025S55J8 is usually 5 days.
3.What payment methods are accepted for 7025S55J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7025S55J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7025S55J8?
7025S55J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7025S55J8 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 7025S55J8?
For technical support, including 7025S55J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7025S55J8 requirements.
6.How does Aetrix verify that 7025S55J8 is sourced from the original manufacturer or authorized distributors?
All 7025S55J8 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 7025S55J8 meets industry standards.
7.What is the process for return or replacement of 7025S55J8?
All 7025S55J8 units undergo pre-shipment inspection (PSI). If there is an issue with 7025S55J8, 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 7025S55J8 part is unused and in its original packaging.
Return procedure for 7025S55J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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