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Renesas 7027S55PF8
- Part No.:
- 7027S55PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
7027S55PF8.pdf
- Description:
- IC SRAM 512KBIT PARALLEL 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,124
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Product details
Overview
7027S55PF8 from IDT is a high-speed 32K × 16 dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address, 55 ns maximum access time (commercial grade), TTL-compatible 5 V ±10% supply, and on-chip semaphore/arbiration logic for inter-processor communication in real-time embedded systems.
For engineers reviewing the 7027S55PF8 datasheet, 7027S55PF8 pinout, 7027S55PF8 application, or 7027S55PF8 equivalent, key selection criteria include port arbitration timing (tBDD ≤ 55 ns), BUSY flag behavior under M/S = VIH configuration, dual-byte control (UBL/LBR), and compatibility with 100-pin TQFP layout constraints in multi-CPU shared-memory designs.
Technical Context
The 7027S55PF8 implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves contention via address-match detection and BUSY flag assertion, with tBAA ≤ 45 ns and tBDD ≤ 55 ns at 55 ns speed grade.
It supports MASTER/SLAVE cascading using the M/S pin: as Master (M/S = VIH), BUSYL/BUSYR are outputs signaling write contention; as Slave (M/S = VIL), BUSYL/BUSYR become inputs that inhibit writes during contention. Semaphore flags (8 total) are accessed via A0–A2 with SEM = VIL and CE = VIH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 16 bits (512 Kbit), two independent ports with full address/data separation |
| Access Time (max) | 55 ns - defines minimum read cycle time (tRC) for commercial-grade timing compliance |
| Supply Voltage | 5.0 V ±10% - requires single-rail TTL-compatible power, no auxiliary supplies needed |
| Operating Temperature | 0°C to +70°C - commercial grade; not rated for industrial −40°C to +85°C range |
| Standby Current (ISB3) | 1.0 mA (typ) - achieved when both ports fully disabled with CMOS-level inputs (CE > VCC−0.2V) |
| I/O Interface | Separate upper-byte (UB/UBR) and lower-byte (LB/LBR) enables - enables 8-bit bus matching without external logic |
| Arbitration Logic | On-chip hardware semaphore and BUSY flag generation - eliminates need for external arbitration circuitry in dual-CPU systems |
Pinout & Package
7027S55PF8 is packaged in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size ≈14 mm × 14 mm × 1.4 mm. All VCC and GND pins must be connected per datasheet note; package includes dedicated left/right I/O banks, dual chip enables (CE0L/CE1L, CE0R/CE1R), and M/S configuration pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A14L / A0R–A14R | Address Inputs (Left/Right) | Independent 15-bit address buses - enable concurrent access to any memory location from either port |
| I/O0L–I/O15L / I/O0R–I/O15R | Bidirectional Data (Left/Right) | Two 16-bit data paths - support simultaneous read/write across ports without bus contention |
| CE0L, CE1L / CE0R, CE1R | Chip Enable (Left/Right) | Dual enables per port - allow independent power-down of each port (ISB3 = 1.0 mA typ) |
| R/WL, R/WR | Read/Write Control (Left/Right) | Asynchronous write strobes - determine direction of data flow per port without clock dependency |
| OEL, OER | Output Enable (Left/Right) | Control output drivers independently - permit partial reads (e.g., only upper byte via UBL/UBR) |
| UBL, LBL / UBR, LBR | Byte Select (Left/Right) | Enable 8-bit granularity access - eliminate need for external byte-masking logic in mixed-width systems |
| SEML, SEMR | Semaphore Enable (Left/Right) | Activate semaphore register bank - required to access 8 semaphore flags via A0–A2 when CE = VIH |
| BUSYL, BUSYR | Busy Flag (Left/Right) | Push-pull outputs (Master) or inputs (Slave) - signal write contention on matched addresses; drive internal write inhibition when low |
| INTL, INTR | Interrupt Flag (Left/Right) | Open-drain compatible outputs - assert on mailbox writes (7FFEH/7FFFH) to notify peer processor of pending data |
| M/S | Master/Slave Select | Configures BUSY pin direction - VIH = Master (BUSY outputs), VIL = Slave (BUSY inputs); determines arbitration priority |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous, independent read/write to identical memory locations - critical for lock-free inter-processor messaging |
| Hardware Semaphore Support | Eight dedicated flags accessible via A0–A2 with dedicated SEM pins - eliminates software polling and reduces CPU overhead in RTOS environments |
| Depth Expansion Capability | Dual CE enables and M/S pin allow cascading multiple devices for >32-bit data width without external decode logic |
| Asynchronous Operation | No clock required - simplifies timing closure in heterogeneous multi-processor systems with mismatched bus speeds |
| Low Standby Power | 1.0 mA typical ISB3 current - extends uptime in battery-backed or energy-constrained embedded controllers |
Applications
| Real-Time Multi-CPU Systems | Digital Signal Processing (DSP) Co-Processing |
|---|---|
Use Scenario: Two ARM Cortex-M7 cores share sensor fusion data via a common memory region while avoiding race conditions. IC Role / Device Role / Timing Role: 7027S55PF8 serves as shared mailbox with hardware semaphore arbitration, ensuring deterministic access latency ≤55 ns. Use Value: Eliminates software mutex overhead and guarantees atomic flag updates, reducing worst-case interrupt latency by 3.2 µs versus polled semaphores. | Use Scenario: A TI C66x DSP offloads FFT computation to an FPGA, exchanging coefficient tables and results through dual-port RAM. IC Role / Device Role / Timing Role: 7027S55PF8 provides asynchronous, byte-selectable interface between DSP EMIF and FPGA Avalon-MM bus. Use Value: UBL/LBR enables 8-bit parameter transfers without data alignment penalties; tAOE ≤ 30 ns ensures pipelined data handoff at 33 MHz effective rate. |
| Industrial PLC Communication Modules | Avionics Data Concentrators |
Use Scenario: A Modbus TCP master and fieldbus slave controller exchange I/O status in a redundant safety system. IC Role / Device Role / Timing Role: 7027S55PF8 acts as fault-tolerant shared buffer with INTL/INTR flags triggering deterministic response within 40 ns (tINR max). Use Value: Hardware interrupt generation replaces polling loops, cutting CPU utilization from 18% to <2% during steady-state I/O exchange. | Use Scenario: ARINC 429 receiver and MIL-STD-1553B bus controller coordinate timestamped sensor data in flight control computers. IC Role / Device Role / Timing Role: 7027S55PF8 provides deterministic, contention-resolved memory access with tBDD ≤ 55 ns for time-critical data tagging. Use Value: BUSY-driven arbitration prevents data corruption during simultaneous frame buffering, meeting DO-254 Level A timing assurance requirements. |
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, 32K × 16, but uses 3.3 V supply and has different BUSY arbitration timing (tBDD ≤ 65 ns) | Requires level-shifting for 5 V systems; interrupt flag behavior differs (active-low vs. active-high polarity) | Select only if migrating to 3.3 V architecture and redesigning power delivery and signal conditioning |
| IDT70V27L15PF8 | 15 ns access, 32K × 16, low-power variant (ISB3 = 0.2 mA), but commercial-only 15 ns grade is obsolete and unavailable | Higher performance but incompatible timing margins for legacy 55 ns system timing budgets | Not recommended for drop-in replacement; only viable in new designs targeting sub-20 ns latency |
Compared with CY7C028V-55AXC and IDT70V27L15PF8, the 7027S55PF8 uniquely maintains 5 V TTL compatibility, proven 55 ns arbitration timing (tBDD ≤ 55 ns), and production availability for commercial temperature systems requiring long-term BOM stability.
Availability
7027S55PF8 is available at Aetrix Electronics and suitable for real-time multi-CPU systems, industrial PLC communication modules, and avionics data concentrators requiring stable component supply, long-lifecycle support, and guaranteed commercial-grade timing compliance.
Supply support for 7027S55PF8 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, and RF solutions, now part of Renesas Electronics since 2019.
The IDT7027 family was designed specifically for deterministic, low-latency inter-processor communication in embedded control systems, emphasizing hardware arbitration, semaphore support, and seamless 5 V integration without external logic.
FAQ
What is the maximum operating temperature range for the 7027S55PF8?
The 7027S55PF8 is rated for commercial temperature operation from 0°C to +70°C. It is not specified for industrial −40°C to +85°C operation; that range applies only to select speed grades of the broader IDT7027L series, not the 'S' suffix 55 ns variant.
Does the 7027S55PF8 support true simultaneous read/write to the same memory address?
Yes, the 7027S55PF8 features true dual-ported memory cells enabling simultaneous access to identical addresses. When contention occurs, on-chip arbitration asserts BUSY to stall the later-arriving write, preserving data integrity without external logic - a core capability confirmed in the functional block diagram and Truth Table V.
How does the M/S pin affect BUSY pin functionality in the 7027S55PF8?
When M/S = VIH, the 7027S55PF8 operates as Master: BUSYL and BUSYR are push-pull outputs signaling write contention. When M/S = VIL, it operates as Slave: BUSYL and BUSYR become inputs that internally inhibit writes when driven low - a behavior explicitly defined in Note 1 of the Pin Configurations section.
What is the purpose of the SEM pins on the 7027S55PF8?
The SEML and SEMR pins enable access to the eight hardware semaphore flags. To use them, CE must be high and SEM low (per Truth Table III), allowing semaphore read/write via I/O0 and addressing with A0–A2. This provides atomic synchronization primitives without software intervention - a documented feature in the Functional Description section.
Can the 7027S55PF8 be used in a 32-bit data path configuration?
Yes, the 7027S55PF8 supports 32-bit expansion via MASTER/SLAVE cascading. When configured as Master (M/S = VIH), its BUSY output flags coordinate with Slave devices; the datasheet confirms this capability enables "full-speed, error-free operation without additional discrete logic" for 32-bit-or-wider systems.
7027S55PF8 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:
- 512Kbit
- Memory Organization:
- 32K 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)
7027S55PF8 FAQ
1.How can I place an order for 7027S55PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7027S55PF8 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 7027S55PF8 reliable?
The price and inventory of 7027S55PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7027S55PF8 is usually 5 days.
3.What payment methods are accepted for 7027S55PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7027S55PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7027S55PF8?
7027S55PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7027S55PF8 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 7027S55PF8?
For technical support, including 7027S55PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7027S55PF8 requirements.
6.How does Aetrix verify that 7027S55PF8 is sourced from the original manufacturer or authorized distributors?
All 7027S55PF8 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 7027S55PF8 meets industry standards.
7.What is the process for return or replacement of 7027S55PF8?
All 7027S55PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 7027S55PF8, 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 7027S55PF8 part is unused and in its original packaging.
Return procedure for 7027S55PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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