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Renesas 7025S55PFI8
- Part No.:
- 7025S55PFI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
7025S55PFI8.pdf
- Description:
- IC SRAM 128KBIT PARALLEL 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,021
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Product details
Overview
7025S55PFI8 from IDT (Integrated Device Technology) is a high-speed, 8K × 16-bit true dual-port static RAM with independent left/right ports, 55 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It supports simultaneous asynchronous access to the same memory location and is used in real-time inter-processor communication, video frame buffers, and military-grade embedded systems requiring deterministic arbitration.
For engineers reviewing the 7025S55PFI8 datasheet, 7025S55PFI8 pinout, 7025S55PFI8 application, or 7025S55PFI8 equivalent, key selection criteria include BUSY-flag arbitration timing (tBAA ≤ 20 ns), semaphore support for inter-port synchronization, battery-backed data retention at 2V, and compatibility with 32-bit bus expansion via MASTER/SLAVE cascading.
Technical Context
The 7025S55PFI8 implements fully asynchronous dual-port architecture with on-chip port arbitration logic and hardware semaphore signaling across eight flags. Its dual control paths-separate CE/R/W/OE/UB/LB per port-enable concurrent reads/writes without external logic.
It features dedicated BUSY flag generation (M/S = H for Master output; M/S = L for Slave input), interrupt flag (INTL/INTR), and byte-selectable I/O (UBL/UBR, LBL/LBR) for multiplexed bus interfacing. The device operates in three power modes: active (typ. 155 mA), standby (ISB1 = 13 mA), and full standby (ISB3 = 1.0 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 16-bit (128 Kbit), true dual-port SRAM with independent address/data/control per port |
| Access Time | 55 ns max read cycle time (tRC), enabling real-time deterministic response in hard real-time systems |
| Supply Voltage | 5.0 V ±10%, TTL-compatible interface eliminates level-shifting requirements in legacy 5V designs |
| Operating Temperature | –40°C to +85°C industrial grade, qualified for extended-life embedded and avionics applications |
| Power Consumption | Active: 155 mA typ (775 mW); Full standby: 1.0 mA typ (5 mW) - supports low-power sleep modes |
| Data Retention | 2 V minimum VCC for data retention (L-version feature), enabling battery backup without external regulators |
| Package | 84-pin PLCC (PFI8 suffix), 25.4 mm × 25.4 mm footprint, leaded package suitable for through-hole and reflow assembly |
Pinout & Package
7025S55PFI8 is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, 25.4 mm × 25.4 mm body size, and standard PLCC thermal and mechanical characteristics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A12L / A0R–A12R | Address Inputs (Left/Right) | 13-bit address per port; enables full 8K-word addressing independently on each side |
| I/O0L–I/O15L / I/O0R–I/O15R | Bidirectional Data Bus (Left/Right) | 16-bit parallel data path per port; supports simultaneous read/write on same or different locations |
| CEL / CER | Chip Enable (Left/Right) | Active-low enable per port; allows selective port activation and power gating |
| R/WL / R/WR | Read/Write Control (Left/Right) | Defines direction per port; high = read, low = write - no external direction logic needed |
| OEL / OER | Output Enable (Left/Right) | Tri-states outputs independently; critical for bus sharing and contention avoidance |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enables byte-level writes (e.g., 8-bit peripheral updates) without disturbing adjacent bytes |
| SEML / SEMR | Semaphore Enable | Activates 8-flag hardware semaphore bank for inter-port synchronization and resource locking |
| INTL / INTR | Interrupt Flag Output | Open-drain push-pull flag indicating semaphore or arbitration events; directly drives MCU interrupt pins |
| BUSYL / BUSYR | Busy Flag (Master/Slave) | When M/S = H: BUSYR is output indicating port contention; when M/S = L: BUSYL is input for slave coordination |
| M/S | Master/Slave Select | Configures device role in cascaded systems; enables automatic 32-bit+ bus expansion without glue logic |
| VCC, GND | Power Supply | Single 5V supply; 12 VCC and 12 GND pins ensure low-noise operation and robust decoupling |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Simultaneous independent read/write access to any memory location by both ports - eliminates arbitration wait states |
| Hardware Semaphore Logic | On-chip 8-flag semaphore bank with dedicated SEM/INT signals - removes need for external semaphores or software locks |
| Automatic Port Arbitration | Deterministic BUSY flag generation with tAPS = 5 ns setup ensures predictable resolution of address-contention conflicts |
| Byte-Controlled Write Enable | Separate UBL/LBL and UBR/LBR pins allow partial-word writes - preserves data integrity during mixed-width transactions |
| Master/Slave Cascading | M/S pin configures device as master (BUSY output) or slave (BUSY input) - enables seamless 32-bit+ word expansion |
| Battery Backup Support | Valid data retention at VCC ≥ 2.0 V - enables non-volatile operation with coin-cell backup without external circuitry |
Applications
| Real-Time Inter-Processor Communication | Video Frame Buffering |
|---|---|
|
Use Scenario: Two DSPs exchange sensor fusion data in autonomous vehicle ECUs with sub-microsecond latency requirements. IC Role / Device Role / Timing Role: Acts as shared memory buffer with hardware BUSY arbitration to prevent race conditions during concurrent access. Use Value: Eliminates software polling or external arbitration logic; 55 ns tRC and tBDD ≤ 30 ns guarantee deterministic <100 ns worst-case interlock resolution. |
Use Scenario: Digital video processor writes captured frames while display controller reads previous frame for overlay rendering. IC Role / Device Role / Timing Role: Provides ping-pong frame storage with independent read/write ports operating at full pixel clock rates. Use Value: Enables zero-latency frame handoff; 16-bit I/O width matches common video data buses; UBL/LBL supports alpha-channel updates. |
| Military Avionics Data Logging | Industrial PLC Memory Expansion |
|
Use Scenario: Flight control system logs telemetry and fault data to non-volatile memory under extreme thermal cycling (–55°C to +125°C). IC Role / Device Role / Timing Role: Serves as high-reliability scratchpad memory with 2V data retention and MIL-qualified packaging. Use Value: Maintains data integrity during brownouts; ISB3 = 1.0 mA standby current extends battery life; PLCC package withstands vibration and thermal shock. |
Use Scenario: Programmable logic controller expands local memory for ladder logic execution and I/O mapping beyond microcontroller limits. IC Role / Device Role / Timing Role: Functions as off-chip program/data RAM with MASTER/SLAVE mode enabling 32-bit bus width using two devices. Use Value: No external address multiplexers or glue logic required; tAA ≤ 55 ns ensures cycle-accurate instruction fetch timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Cypress CY7C028V-55AC | 55 ns access, 8K × 16, 3.3V core (5V-tolerant I/O), 100-pin TQFP | Requires level translation in legacy 5V systems; lower active power but no 2V data retention | Select for new 3.3V designs prioritizing power efficiency over battery backup capability |
| Renesas R1EX24002DPX | 55 ns access, 8K × 16, 5V, 84-pin PLCC, but lacks hardware semaphore and BUSY arbitration | No built-in inter-port sync logic - requires external arbitration or software-managed semaphores | Select only when semaphore/BUSY features are unused and cost is primary constraint |
Compared with CY7C028V-55AC and R1EX24002DPX, the 7025S55PFI8 uniquely integrates hardware semaphore, deterministic BUSY arbitration, and 2V data retention in a drop-in 84-pin PLCC - making it irreplaceable in safety-critical, battery-backed, or legacy 5V dual-processor systems.
Availability
7025S55PFI8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, video frame buffering, and military avionics data logging requiring stable component supply across extended product lifecycles.
Supply support for 7025S55PFI8 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 7025S55PFI8 belongs to IDT's legacy high-speed dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in aerospace, defense, and industrial control systems.
FAQ
What is the maximum operating temperature range for the 7025S55PFI8?
The 7025S55PFI8 is rated for industrial temperature operation from –40°C to +85°C. This range is explicitly confirmed in the datasheet's "Recommended DC Operating Conditions" table (Table 2683 tbl 05) and applies to all speed grades including the 55 ns version. It is not rated for commercial (0°C to +70°C) or military (–55°C to +125°C) ranges.
Does the 7025S55PFI8 support true simultaneous read operations on the same memory address?
Yes, the 7025S55PFI8 supports true simultaneous reads of the same memory location via its true dual-port architecture. The datasheet states: "True Dual-Ported memory cells which allow simultaneous reads of the same memory location." This capability is inherent to the cell design and requires no special timing or configuration.
What does the 'PFI8' suffix indicate in the 7025S55PFI8 part number?
The 'PFI8' suffix specifies the package and temperature grade: 'P' = Plastic Leaded Chip Carrier (PLCC), 'F' = Industrial temperature range (–40°C to +85°C), 'I' = 55 ns speed grade, and '8' = 84-pin count. This matches IDT's official ordering guide and pin configuration diagrams for the 84-pin PLCC variant.
Can the 7025S55PFI8 operate with a 2V supply for data retention only?
Yes, the 7025S55PFI8 (L-version) supports data retention at VCC = 2.0 V, as documented in Table 2683 tbl 10 ("Data Retention Characteristics"). This mode maintains stored data indefinitely while drawing ≤4000 µA (military/industrial) or ≤1500 µA (commercial), enabling battery backup without active regulation.
How does the M/S pin affect BUSY signal behavior on the 7025S55PFI8?
When M/S = H (high), the device operates as Master: BUSYR is an output flag asserting during port contention. When M/S = L (low), it operates as Slave: BUSYL becomes an input used to synchronize writes with the Master's BUSY signal. This dual-role behavior is defined in the Functional Block Diagram notes and Truth Table II.
7025S55PFI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 100-LQFP
- 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:
- 100-TQFP (14x14)
7025S55PFI8 FAQ
1.How can I place an order for 7025S55PFI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7025S55PFI8 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 7025S55PFI8 reliable?
The price and inventory of 7025S55PFI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7025S55PFI8 is usually 5 days.
3.What payment methods are accepted for 7025S55PFI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7025S55PFI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7025S55PFI8?
7025S55PFI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7025S55PFI8 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 7025S55PFI8?
For technical support, including 7025S55PFI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7025S55PFI8 requirements.
6.How does Aetrix verify that 7025S55PFI8 is sourced from the original manufacturer or authorized distributors?
All 7025S55PFI8 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 7025S55PFI8 meets industry standards.
7.What is the process for return or replacement of 7025S55PFI8?
All 7025S55PFI8 units undergo pre-shipment inspection (PSI). If there is an issue with 7025S55PFI8, 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 7025S55PFI8 part is unused and in its original packaging.
Return procedure for 7025S55PFI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7025S55PFI8 Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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