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Renesas 7025S35FB
- Part No.:
- 7025S35FB
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 84-FlatPack
- Datasheet:
-
7025S35FB.pdf
- Description:
- IC SRAM 128KBIT PAR 84FLATPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,917
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Product details
Overview
7025S35FB from IDT (Integrated Device Technology) is a high-speed 8K × 16-bit true dual-port static RAM with independent asynchronous left/right ports, 35 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 7025S35FB datasheet, 7025S35FB pinout, 7025S35FB application, or 7025S35FB equivalent, key selection considerations include BUSY arbitration timing (tBAA ≤ 20 ns), semaphore flag support (8 flags via A0–A2), byte-selectable I/O (UBL/LBL), and 84-pin PGA package compatibility with legacy military/industrial board layouts.
Technical Context
The 7025S35FB implements full hardware port arbitration with dedicated BUSY output (master mode) or BUSY input (slave mode) controlled by the M/S pin. Its on-chip semaphore logic supports eight independent flags accessed via I/O0–I/O15 using address lines A0–A2, enabling inter-processor synchronization without external logic.
It operates fully asynchronously from either port, with separate CE/R/W/OE/UB/LB controls per side, and supports battery backup data retention at 2V (typical ICCDR = 100 µA). The device uses CMOS process technology and features non-tri-stated push-pull INT and BUSY outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 16-bit (128 Kbit), true dual-port SRAM with independent left/right address/data/control |
| Access Time | 35 ns max read cycle time - guarantees deterministic latency for real-time interrupt handlers and DSP co-processors |
| Supply Voltage | 5.0 V ±10% - compatible with legacy 5V TTL logic families and eliminates level-shifting in mixed-voltage systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor drives and PLC backplanes |
| Power Consumption | Active: 150 mA typ (both ports); Standby (ISB1): 13 mA typ - enables low-idle-power operation in always-on controllers |
| Package | 84-pin Ceramic PGA (PLG84) - provides hermetic sealing and thermal stability for high-reliability applications |
| Data Retention | 2 V minimum - supports battery-backed memory hold during main power loss in safety-critical systems |
Pinout & Package
7025S35FB is housed in an 84-pin ceramic Pin Grid Array (PLG84) package with 1.15″ × 1.15″ footprint and 0.17″ height. All VCC pins require connection to +5V; all GND pins must be tied to system ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Independent enable per port; deassertion places respective port in high-Z standby |
| R/WL / R/WR | Read/Write Control (Left / Right) | Active-low; determines direction of data flow on associated I/O bus |
| OEL / OER | Output Enable (Left / Right) | Controls tri-state of I/O drivers; required for bus sharing with other devices |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enables 8-bit granularity writes - essential for multiplexed 16-bit bus interfacing |
| SEML / SEMR | Semaphore Enable | Activates on-chip semaphore register access (8 flags) via A0–A2 addressing |
| BUSYL / BUSYR | Busy Flag (Master Output / Slave Input) | M/S = H: BUSY is output indicating port contention; M/S = L: BUSY is input for slave coordination |
| INTL / INTR | Interrupt Flag | Push-pull output signals semaphore or write completion events to host processor |
| I/O0L–I/O15L / I/O0R–I/O15R | Data I/O (Left / Right) | Bi-directional 16-bit buses; support simultaneous reads to same address with no conflict |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables concurrent read access from both ports to identical memory locations - eliminates arbitration wait states in lock-step processors |
| Hardware Semaphore Logic | Eight dedicated flags accessible via A0–A2 and I/O0–I/O15 - removes need for external semaphores or software polling in multi-CPU systems |
| Master/Slave Cascading | M/S pin configures device as master (BUSY output) or slave (BUSY input) - allows seamless 32-bit+ word expansion without glue logic |
| Asynchronous Port Operation | No shared clocks or synchronization overhead between ports - simplifies timing closure in heterogeneous subsystems (e.g., FPGA + MCU) |
| Battery Backup Support | Retains data at 2V supply - enables non-volatile storage during AC failure in industrial HMIs and motion controllers |
Applications
| Industrial Motion Controller | Dual-Core DSP Co-Processor Interface |
|---|---|
Use Scenario: Real-time servo loop execution with position feedback buffering and command queueing across two independent processing cores. IC Role / Device Role / Timing Role: Shared memory buffer with atomic semaphore-controlled access ensures deterministic jitter-free updates between motion planner and PID executor. Use Value: Eliminates bus contention delays; 35 ns access enables sub-10 µs loop update cycles at 100 kHz servo rates. | Use Scenario: High-throughput FFT data exchange between primary DSP and auxiliary signal conditioning engine. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-wait-state ping-pong buffer, synchronized via BUSY handshake and semaphore flags. Use Value: Sustains 200 MB/s sustained bandwidth (16-bit × 12.5 MHz) without DMA stalls or CPU intervention. |
| Avionics Display Management Unit | Redundant PLC Backplane Memory |
Use Scenario: Concurrent rendering engine (GPU-side) and flight data acquisition (CPU-side) accessing shared graphics frame and telemetry buffers. IC Role / Device Role / Timing Role: 7025S35FB serves as fault-tolerant shared memory with independent port timing - critical for DO-254 Level A compliance. Use Value: Hermetic 84-pin PGA package ensures reliability at altitude; 2V data retention maintains display state during brownouts. | Use Scenario: Hot-swappable redundant controller modules exchanging status, configuration, and I/O image data in real time. IC Role / Device Role / Timing Role: Dual-port RAM provides atomic cross-module communication channel with hardware-enforced mutual exclusion via semaphores. Use Value: Enables <100 ns interlock response time for failover decisions - meets SIL-3 requirements for safety shutdown logic. |
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-35AXC | 32K × 16 organization, 35 ns access, 100-pin TQFP; no built-in semaphore logic | Requires external arbitration logic for multi-processor sync; larger density suits extended buffer needs | Choose when higher memory depth is required and external semaphore management is acceptable |
| IDT70V25S35PF | 3.3V core supply, 35 ns access, 100-pin TQFP; LVCMOS I/O, no 5V tolerance | Not pin-compatible; requires level shifters for legacy 5V systems; lower power but incompatible voltage domain | Choose only for new 3.3V designs where power reduction outweighs redesign cost |
Compared with CY7C028V-35AXC and IDT70V25S35PF, the 7025S35FB uniquely delivers 5V TTL compatibility, integrated semaphores, and 84-pin PGA packaging - making it irreplaceable in retrofit industrial and avionics platforms requiring drop-in 5V dual-port memory with hardware synchronization.
Availability
7025S35FB is available at Aetrix Electronics and suitable for industrial motion control, avionics display systems, and redundant PLC backplanes requiring stable component supply, long-term obsolescence management, and MIL-STD-883-compliant traceability.
Supply support for 7025S35FB 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 ICs before its acquisition by Renesas Electronics in 2019. It pioneered dual-port SRAM architectures for real-time embedded systems.
The IDT7025 family was designed specifically for deterministic, contention-free memory sharing between independent processors or bus masters in military, industrial, and telecom infrastructure - emphasizing hardware arbitration, battery backup, and rugged packaging.
FAQ
What is the maximum operating temperature range for the 7025S35FB?
The 7025S35FB is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the "Recommended DC Operating Conditions" table (DSC 2683/13, Table 5), where the Industrial grade explicitly defines this range under 5.0V ±10% supply. It does not support military-grade –55°C to +125°C operation.
Does the 7025S35FB support battery backup data retention, and at what voltage?
Yes, the 7025S35FB supports battery backup data retention at a minimum VCC of 2.0 V, as specified in Table 10 ("Data Retention Characteristics"). The typical data retention current (ICCDR) is 100 µA across the industrial temperature range, enabling reliable hold during main power loss in safety-critical systems.
How does the BUSY signal function in master vs. slave configuration on the 7025S35FB?
When M/S = H, the 7025S35FB operates as master: BUSY is an output that asserts when port contention occurs (e.g., simultaneous write to same address). When M/S = L, it operates as slave: BUSY is an input used to stall writes until the master clears contention - detailed in Note 1 of the Functional Block Diagram and Truth Table II.
Can the 7025S35FB be used in a 32-bit data bus system, and how is this implemented?
Yes, the 7025S35FB supports 32-bit expansion via master/slave cascading. One device is configured as master (M/S = H), another as slave (M/S = L); the master's BUSY output connects to the slave's BUSY input. This enables full-speed, error-free 32-bit operation without external logic, as described in the "Description" section (page 2) and Figure 2683 drw 02.
What are the key timing parameters governing semaphore flag access on the 7025S35FB?
Semaphore access requires SEM = VIH for RAM mode or SEM = VIL for semaphore mode (Table 2683 tbl 03). Critical timing includes tSOP (semaphore pulse width, min 15 ns) and tSAA (semaphore address access, max 35 ns for 35 ns version), ensuring reliable flag read/write within the same cycle as memory operations.
7025S35FB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 84-FlatPack
- 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:
- 35ns
- Access Time:
- 35 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 84-FPACK
7025S35FB FAQ
1.How can I place an order for 7025S35FB through Aetrix?
Please submit a Request for Quotation (RFQ) for 7025S35FB 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 7025S35FB reliable?
The price and inventory of 7025S35FB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7025S35FB is usually 5 days.
3.What payment methods are accepted for 7025S35FB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7025S35FB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7025S35FB?
7025S35FB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7025S35FB 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 7025S35FB?
For technical support, including 7025S35FB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7025S35FB requirements.
6.How does Aetrix verify that 7025S35FB is sourced from the original manufacturer or authorized distributors?
All 7025S35FB 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 7025S35FB meets industry standards.
7.What is the process for return or replacement of 7025S35FB?
All 7025S35FB units undergo pre-shipment inspection (PSI). If there is an issue with 7025S35FB, 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 7025S35FB part is unused and in its original packaging.
Return procedure for 7025S35FB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7025S35FB 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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AT24C02C-SSHM-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
Microchip Technology
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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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