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Renesas 7025S55PF
- Part No.:
- 7025S55PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
7025S55PF.pdf
- Description:
- IC SRAM 128KBIT PARALLEL 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,173
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Product details
Overview
7025S55PF 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 cycle time, TTL-compatible 5V ±10% supply, 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 7025S55PF datasheet, 7025S55PF pinout, 7025S55PF application, or 7025S55PF equivalent, key selection considerations include BUSY-flag arbitration timing (tBAA ≤ 20 ns), semaphore-controlled inter-port synchronization, low-power standby current (ISB1 = 13 mA typ.), and 84-pin PGA package compatibility with legacy military/industrial PCB layouts.
Technical Context
The 7025S55PF implements fully asynchronous dual-port architecture with on-chip port arbitration logic and hardware semaphore signaling across eight flags. Its two independent address/data/control interfaces allow concurrent read/write operations without external logic - critical for real-time DSP co-processing and FPGA-based data buffering.
It features separate upper-byte (UBR/UBL) and lower-byte (LBR/LBL) enables, Master/Slave select (M/S) for BUSY flag directionality, and interrupt flag (INTL/INTR) generation triggered by semaphore state changes - all operating under single 5V supply with no voltage translation required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 16 bits (128 Kbit); supports independent 16-bit word access per port |
| Max Read Cycle Time (tRC) | 55 ns - defines minimum clock period for sustained random read throughput |
| Operating Voltage | 5.0 V ±10% - compatible with legacy TTL and 5V CMOS logic families |
| Temperature Range | –40°C to +85°C - qualified for industrial-grade reliability without derating |
| Standby Current (ISB1) | 13 mA (typ.) - enables low-power idle mode during inter-burst intervals |
| Bus Width Expansion | Master/Slave cascade support - allows 32-bit+ data paths without glue logic |
| Data Retention | 2 V minimum - maintains contents during brown-out or backup battery operation |
Pinout & Package
7025S55PF is housed in an 84-pin ceramic Pin Grid Array (PGA) package (PLG84), measuring approximately 1.15 in × 1.15 in × 0.17 in, with 4 ground pins, 4 VCC pins, and dual-port symmetry enabling direct PCB layout reuse across left/right port assignments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low enable per port; controls power-up/down of respective port circuitry |
| R/WL / R/WR | Read/Write Enable (Left / Right) | Determines direction of data transfer on I/O bus; high = read, low = write |
| OEL / OER | Output Enable (Left / Right) | Tri-states I/O drivers when deasserted; enables shared bus contention management |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enables 8-bit granularity writes - essential for mixed-width peripheral interfacing |
| SEML / SEMR | Semaphore Enable | Activates hardware semaphore register access (A0–A2 addressed) for inter-port sync |
| BUSYL / BUSYR | Busy Flag (Master Output / Slave Input) | Indicates port contention; M/S = H configures left port as master with BUSYL output |
| INTL / INTR | Interrupt Flag | Open-drain active-low signal asserted on semaphore state change or arbitration event |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous reads/writes to identical addresses - eliminates software polling delays in lock-step processing |
| Hardware Semaphore Logic | Eight dedicated flags accessible via A0–A2; provides atomic resource locking without CPU intervention |
| On-Chip Arbitration | Automatic BUSY assertion resolves port conflicts within 20 ns (tBAA), ensuring deterministic timing in real-time systems |
| Master/Slave Cascading | Single M/S pin configures BUSY directionality - simplifies 32-bit memory expansion with zero external logic |
| Battery Backup Support | Maintains data at 2 V supply - enables seamless transition to backup power during main rail failure |
Applications
| Industrial Motion Controller | FPGA-Based Data Acquisition |
|---|---|
|
Use Scenario: Real-time coordination between motion trajectory processor and servo feedback loop. IC Role / Device Role / Timing Role: Dual-port RAM buffers position setpoints (left port) and encoder feedback (right port) with sub-55 ns latency. Use Value: Eliminates CPU-mediated handshaking; enables deterministic 20 kHz control loop execution. |
Use Scenario: High-throughput sensor streaming into FPGA fabric with parallel preprocessing and host DMA. IC Role / Device Role / Timing Role: Left port accepts ADC data bursts; right port feeds processed frames to PCIe interface logic. Use Value: Sustains 128 MB/s aggregate bandwidth without FIFO overflow or pipeline stalls. |
| Digital Signal Processor Co-Processor | Military Avionics Display Buffer |
|
Use Scenario: Offloading FFT computation from main CPU while maintaining shared coefficient tables. IC Role / Device Role / Timing Role: Host CPU writes coefficients via left port; DSP reads via right port with full concurrency. Use Value: Reduces coefficient update latency from microseconds to single-cycle access. |
Use Scenario: Frame buffer for mission-critical cockpit display with guaranteed data integrity during EMI events. IC Role / Device Role / Timing Role: Stores rendered graphics (left port) and overlays HUD symbology (right port) with hardware arbitration. Use Value: Prevents visual corruption during simultaneous render/update operations under MIL-STD-461E conditions. |
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, 84-pin PLCC; no built-in semaphore logic; requires external arbitration | Lacks hardware semaphore flags - demands additional logic for inter-processor sync | Choose when board space permits discrete arbitration and cost sensitivity outweighs design cycle time |
| AS7C3256B-55PC | 55 ns, 32K × 8 organization; 5V-only; 56-pin SOJ; no BUSY/INT signals or M/S configuration | Single-port architecture - cannot support true concurrent access; requires software-managed buffering | Select only for non-real-time applications where port independence is unnecessary and density is primary |
Compared with CY7C136-55JC and AS7C3256B-55PC, the 7025S55PF delivers integrated arbitration and semaphore logic in a drop-in PGA footprint - reducing BOM count by ≥3 components and eliminating timing-critical firmware synchronization code.
Availability
7025S55PF is available at Aetrix Electronics and suitable for industrial motion control, avionics display subsystems, and FPGA-based data acquisition requiring stable component supply across extended product lifecycles.
Supply support for 7025S55PF 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 for industrial, communications, and aerospace markets.
The 7025S55PF belongs to IDT's legacy dual-port SRAM family designed specifically for deterministic real-time systems requiring hardware-enforced inter-processor synchronization and zero-latency memory sharing.
FAQ
What is the maximum operating temperature range for the 7025S55PF?
The 7025S55PF is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per the datasheet's "Recommended DC Operating Conditions" table and applies across all AC timing parameters including tRC = 55 ns, making it suitable for harsh-environment deployments without thermal derating.
Does the 7025S55PF support battery backup operation?
Yes, the 7025S55PF supports data retention at VCC = 2.0 V minimum, as confirmed in the "Data Retention Characteristics" section (Table 10). This enables seamless failover to backup power sources while preserving memory contents - a key requirement in avionics and industrial safety systems.
How does the BUSY arbitration mechanism work on the 7025S55PF?
The 7025S55PF uses hardware-driven BUSY arbitration: when both ports attempt access to the same address, the M/S pin configures one port as master (BUSY output) and the other as slave (BUSY input). The master asserts BUSY within 20 ns (tBAA) to block conflicting writes - ensuring deterministic resolution without software overhead.
Can the 7025S55PF be used in a 32-bit memory system?
Yes, the 7025S55PF supports 32-bit expansion via its Master/Slave cascading capability. Two devices can be configured - one as master (M/S = H), one as slave (M/S = L) - using BUSY handshake to coordinate access, eliminating external logic and preserving full 55 ns performance across the wider bus.
What is the purpose of the SEM pins on the 7025S55PF?
The SEML and SEMR pins enable hardware semaphore register access. When asserted, they route A0–A2 to eight dedicated flags instead of memory addresses - allowing atomic test-and-set operations between ports. This eliminates race conditions in multi-processor resource sharing without CPU intervention.
7025S55PF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Tray
- 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:
- 100-TQFP (14x14)
7025S55PF FAQ
1.How can I place an order for 7025S55PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 7025S55PF 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 7025S55PF reliable?
The price and inventory of 7025S55PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7025S55PF is usually 5 days.
3.What payment methods are accepted for 7025S55PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7025S55PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7025S55PF?
7025S55PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7025S55PF 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 7025S55PF?
For technical support, including 7025S55PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7025S55PF requirements.
6.How does Aetrix verify that 7025S55PF is sourced from the original manufacturer or authorized distributors?
All 7025S55PF 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 7025S55PF meets industry standards.
7.What is the process for return or replacement of 7025S55PF?
All 7025S55PF units undergo pre-shipment inspection (PSI). If there is an issue with 7025S55PF, 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 7025S55PF part is unused and in its original packaging.
Return procedure for 7025S55PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7025S55PF Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
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