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Renesas 7008L55PFI
- Part No.:
- 7008L55PFI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
7008L55PFI.pdf
- Description:
- IC SRAM 512KBIT PARALLEL 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,052
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Product details
Overview
7008L55PFI from IDT is a high-speed 64K × 8 true dual-ported static RAM with independent left/right ports, 55 ns maximum access time, TTL-compatible 5 V ±10% supply, and integrated semaphore/arbitration logic for inter-processor communication in real-time embedded systems.
For engineers reviewing the 7008L55PFI datasheet, 7008L55PFI pinout, 7008L55PFI application, or 7008L55PFI equivalent, key selection criteria include BUSY flag arbitration timing (tBDD ≤ 55 ns), low standby power (1 mW typ.), industrial temperature range (–40°C to +85°C), and 100-pin TQFP package compatibility with memory coherency protocols.
Technical Context
The 7008L55PFI implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port-enabling simultaneous read/write access to any memory location without contention. Its on-chip arbitration logic uses push-pull BUSY outputs (not tri-state) and supports Master/Slave cascading via M/S pin for 16-bit+ word expansion.
It integrates dedicated semaphore registers (8 flags, addressed by A0–A2) accessible only when CE = VIH and SEM = VIL, with write-to-read latency tSWRD = 5 ns and contention window tSPS = 5 ns. Interrupt flags (INTL/INTR) are triggered by writes to fixed addresses FFFEH (left) and FFFFH (right).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 64K × 8 bits (512 Kbit), fully random-access SRAM array |
| Access Time (max) | 55 ns - defines minimum read cycle time (tRC) for worst-case timing closure |
| Supply Voltage | 5.0 V ±10% - single TTL-compatible rail; all VCC pins require connection |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade reliability and thermal stability |
| Standby Current (typ) | 1 mW - achieved via full CMOS standby mode (ISB3 ≤ 5 µA at VCC = 5 V) |
| Package | 100-pin TQFP - 14 mm × 14 mm body, lead pitch 0.5 mm, RoHS-compliant |
| BUSY Arbitration | Push-pull output (not open-drain); tBDD ≤ 55 ns ensures valid data before BUSY deassertion |
Pinout & Package
7008L55PFI is packaged in a 100-pin Thin Quad Flatpack (TQFP) with exposed thermal pad, 0.5 mm pitch, and 14 mm × 14 mm footprint. Pin 1 marked via corner notch; pin numbering follows standard counter-clockwise sequence from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A15L | Left port address inputs | 16-bit address bus for left-side memory access; must be stable before CE0L assertion |
| A0R–A15R | Right port address inputs | Independent 16-bit address bus; enables concurrent addressing of same or different locations |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; direction controlled by R/WL and OEL; high-impedance when disabled |
| I/O0R–I/O7R | Right port bidirectional data | Electrically isolated from left port; no shared bus loading or timing coupling |
| CE0L, CE1L | Left port chip enables | TTL/CMOS-compatible active-low enables; dual CE allows depth expansion without external logic |
| CE0R, CE1R | Right port chip enables | Independent enable control per port; supports selective power-down of inactive port |
| R/WL, R/WR | Read/write control | Active-low write enable; determines data flow direction on respective I/O bus |
| OEL, OER | Output enable | Controls three-state output drivers; required LOW for read data assertion |
| SEML, SEMR | Semaphore enable | Activates semaphore register access (A0–A2) when CE = VIH and SEM = VIL |
| INTL, INTR | Interrupt flags | Open-collector compatible (per datasheet note), asserted by opposite-port mailbox writes |
| BUSYL, BUSYR | Arbitration flags | Push-pull outputs (not tri-state); indicate port contention; M/S pin configures MASTER/SLAVE role |
| M/S | Master/Slave select | VIL configures as SLAVE (BUSY input); VIH configures as MASTER (BUSY output) |
| VCC, GND | Power & ground | Multiple VCC/GND pins required-must all be connected per datasheet Note 1 & 4 |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port architecture | Simultaneous independent reads/writes to same memory location without internal contention |
| Hardware semaphore support | Eight dedicated flags (A0–A2) with 5 ns write-to-read latency (tSWRD) for deterministic resource locking |
| Port arbitration with BUSY signaling | Push-pull BUSY outputs enforce write inhibition during contention; tBDD ≤ 55 ns guarantees data validity window |
| Low-power standby modes | 1 mW typical standby (ISB3) via full CMOS shutdown-critical for battery-backed or energy-sensitive systems |
| Master/Slave cascading | M/S pin enables seamless 16-bit+ bus expansion using multiple 7008L55PFI devices without glue logic |
Applications
| Real-Time Industrial PLC | Dual-Core Microcontroller Interfacing |
|---|---|
Use Scenario: Two independent CPU cores share sensor data and control commands via shared memory with guaranteed atomicity. IC Role / Device Role / Timing Role: Dual-port SRAM acts as coherent message buffer; BUSY arbitration prevents race conditions during concurrent access. Use Value: Eliminates software mutex overhead; 55 ns access enables sub-microsecond inter-core handshaking in motion control loops. | Use Scenario: ARM Cortex-M7 and RISC-V companion processor exchange telemetry and firmware updates over shared memory. IC Role / Device Role / Timing Role: 7008L55PFI provides isolated address/data paths and hardware semaphore flags for lock-free synchronization. Use Value: tSPS = 5 ns contention window ensures deterministic flag acquisition; industrial temp rating supports extended field deployment. |
| Avionics Data Concentrator | Medical Imaging Frame Buffer |
Use Scenario: ARINC 429 receiver and safety-critical flight controller access shared status registers and command queues. IC Role / Device Role / Timing Role: 7008L55PFI serves as fault-tolerant dual-port buffer with interrupt-driven mailbox (FFFEH/FFFFH) for priority event signaling. Use Value: –40°C to +85°C operation meets DO-160E environmental requirements; push-pull BUSY prevents latch-up under EMI stress. | Use Scenario: FPGA-based image acquisition engine writes raw frames while DSP subsystem reads processed buffers. IC Role / Device Role / Timing Role: True dual-port SRAM decouples write/read bandwidth; independent CE0/CE1 enables dynamic power gating per channel. Use Value: 1 mW standby current extends system uptime in portable ultrasound units; 100-pin TQFP fits high-density PCB layouts. |
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 access, 64K × 16 organization, 3.3 V supply, 100-pin TQFP | Wider data bus but incompatible voltage; requires level-shifting for 5 V systems | Select only if migrating to 3.3 V architecture and needing 16-bit word access |
| IDT70V27L25PF | 25 ns access, 32K × 16, 3.3 V supply, 100-pin TQFP, LVDS-compatible | Faster but lower density and voltage-incompatible; lacks BUSY arbitration logic | Choose for high-speed 3.3 V designs where arbitration is handled externally |
Compared with CY7C028V-55AXC and IDT70V27L25PF, the 7008L55PFI uniquely delivers 5 V compatibility, hardware BUSY arbitration, and industrial temperature support in a 64K × 8 configuration-making it optimal for legacy 5 V real-time control systems requiring deterministic inter-processor coordination.
Availability
7008L55PFI is available at Aetrix Electronics and suitable for real-time industrial PLCs, avionics data concentrators, and medical imaging frame buffers requiring stable component supply across extended product lifecycles.
Supply support for 7008L55PFI 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 timing, memory interface, RF, and sensor solutions, now part of Renesas Electronics.
The IDT7008 family was designed specifically for deterministic inter-processor communication in hard real-time embedded systems-emphasizing hardware arbitration, low-latency semaphore support, and industrial-grade reliability.
FAQ
What is the maximum operating temperature range for the 7008L55PFI?
The 7008L55PFI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per datasheet Table 6 and applies to all AC/DC electrical parameters within the 5.0 V ±10% supply range. The device uses CMOS process technology optimized for thermal stability across this full range.
Does the 7008L55PFI support true simultaneous read operations on both ports?
Yes, the 7008L55PFI implements true dual-ported memory cells that allow simultaneous reads from both left and right ports-even to the same memory address-without contention or timing penalty. This is confirmed in the Functional Description section and enabled by independent address/control/I/O paths per port.
How does the BUSY arbitration logic function in Master vs. Slave configuration on the 7008L55PFI?
When M/S = VIH, the 7008L55PFI operates as Master: BUSYL and BUSYR are push-pull outputs asserting contention. When M/S = VIL, it operates as Slave: BUSYL and BUSYR become inputs that inhibit writes internally. This behavior is defined in Notes 1 and 2 of the Functional Block Diagram and verified in Truth Table V.
What are the power consumption characteristics of the 7008L55PFI in standby mode?
The 7008L55PFI achieves 1 mW typical standby power (ISB3 ≤ 5 µA at VCC = 5 V) when both ports are fully disabled with CMOS-level inputs. This is documented in Table 10b for the "L" variant at 55 ns speed grade and is critical for low-power industrial applications.
Can the 7008L55PFI be used for semaphore-based resource locking between two processors?
Yes-the 7008L55PFI includes eight dedicated hardware semaphore flags accessed via A0–A2 when CE = VIH and SEM = VIL. Each flag supports atomic write/read with tSWRD = 5 ns and tSPS = 5 ns contention window, enabling deterministic, lock-free synchronization between independent processors.
7008L55PFI 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:
- 512Kbit
- Memory Organization:
- 64K x 8
- 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)
7008L55PFI FAQ
1.How can I place an order for 7008L55PFI through Aetrix?
Please submit a Request for Quotation (RFQ) for 7008L55PFI 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 7008L55PFI reliable?
The price and inventory of 7008L55PFI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7008L55PFI is usually 5 days.
3.What payment methods are accepted for 7008L55PFI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7008L55PFI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7008L55PFI?
7008L55PFI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7008L55PFI 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 7008L55PFI?
For technical support, including 7008L55PFI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7008L55PFI requirements.
6.How does Aetrix verify that 7008L55PFI is sourced from the original manufacturer or authorized distributors?
All 7008L55PFI 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 7008L55PFI meets industry standards.
7.What is the process for return or replacement of 7008L55PFI?
All 7008L55PFI units undergo pre-shipment inspection (PSI). If there is an issue with 7008L55PFI, 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 7008L55PFI part is unused and in its original packaging.
Return procedure for 7008L55PFI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7008L55PFI Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
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