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Renesas 7005S55PFI8
- Part No.:
- 7005S55PFI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
7005S55PFI8.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,806
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Product details
Overview
7005S55PFI8 from IDT is a high-speed 8K × 8 (64 Kbit) true dual-port static RAM with independent left/right ports, 55 ns maximum read cycle time, TTL-compatible 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous access to the same memory location and supports master/slave arbitration for 16-bit+ bus expansion in real-time embedded control systems.
For engineers reviewing the 7005S55PFI8 datasheet, 7005S55PFI8 pinout, 7005S55PFI8 application, or 7005S55PFI8 equivalent, key selection criteria include BUSY-flag arbitration timing (tBDD ≤ 40 ns), semaphore flag support (8 flags via A0–A2), low-power standby current (ISB1 = 13 mA typ.), and TQFP-64 package compatibility with PCB layout constraints for dual-processor interconnects.
Technical Context
The 7005S55PFI8 implements fully asynchronous dual-port operation with separate address, data, and control buses per port (A0L–A12L/I/O0L–I/O7L/CEL/OEL/R/WL on left; A0R–A12R/I/O0R–I/O7R/CER/OER/R/WR on right). On-chip arbitration logic resolves contention using either chip-enable (CE) or address-match priority, with BUSY outputs asserted when write conflicts occur.
It integrates full hardware semaphore signaling (SEML/SEMR) for inter-processor synchronization and interrupt flag generation (INTL/INTR) triggered by dedicated addresses (e.g., 1FFFH sets INTR). The device supports battery backup data retention at 2 V (ICCDR ≤ 4000 µA) and withstands >2001 V ESD per MIL-STD-883.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 8 bits (64 Kbit), true dual-port SRAM with independent left/right access paths |
| Access Time (tRC) | 55 ns max - defines minimum read cycle interval for sustained throughput in real-time systems |
| Supply Voltage | 5.0 V ±10% - compatible with legacy TTL logic families without level-shifting |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor drives and PLCs |
| Standby Current (ISB1) | 13 mA typical - power-down mode active when both CE pins high, enabling low-idle power in battery-backed systems |
| Bus Width Expansion | Master/Slave (M/S) select enables cascading for 16-bit+ data paths without external glue logic |
| Data Retention | 2 V minimum - retains memory contents during main power loss using backup battery |
Pinout & Package
7005S55PFI8 is packaged in a 64-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 decoupled locally per datasheet layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A12L | Left port address inputs | 13-bit address bus for left-side memory access; non-mirrored vs. right port (A0R–A12R) |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; tri-stated when OEL high or CEL high |
| CEL, OEL, R/WL | Left port controls | Chip enable, output enable, and read/write direction - fully asynchronous with no clock required |
| A0R–A12R | Right port address inputs | Independent 13-bit address space; allows concurrent access to same or different locations |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path isolated from left port; no internal bus contention |
| CER, OER, R/WR | Right port controls | Functionally identical to left controls but electrically isolated |
| SEML, SEMR | Semaphore enable | Activates hardware semaphore register bank (8 flags addressed by A0–A2) for inter-processor coordination |
| INTL, INTR | Interrupt flags | Open-drain outputs (per datasheet note 2) asserting on write to dedicated addresses (e.g., 1FFEH) |
| BUSYL, BUSYR | Arbitration status | Push-pull outputs (not open-drain); BUSYL = LOW blocks left writes when right port accesses same address |
| M/S | Master/Slave select | M/S = HIGH configures as master (BUSY outputs); M/S = LOW configures as slave (BUSY inputs) |
| VCC, GND | Power | Multiple VCC/GND pins require individual 0.1 µF ceramic decoupling; all must be connected |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port architecture | Enables simultaneous reads/writes from both ports to identical memory locations without arbitration delay |
| Hardware semaphore logic | Eight dedicated flags accessible via A0–A2 allow atomic test-and-set operations between processors |
| On-chip arbitration | Automatic BUSY assertion resolves port conflicts using CE timing or address-match priority (tAPS = 5 ns min) |
| 5 V TTL compatibility | Eliminates level translators in legacy 5 V systems; VIH = 2.2 V min, VIL = 0.8 V max |
| Battery backup support | Retains data at 2 V supply (VDR), enabling seamless failover in power-critical applications |
Applications
| Motor Control System | Digital Signal Processor Interface |
|---|---|
Use Scenario: Dual-core motion controller where one CPU handles trajectory planning and the other executes real-time PWM updates. IC Role / Device Role / Timing Role: Shared memory buffer synchronizing position setpoints and feedback data between cores with sub-55 ns latency. Use Value: Eliminates software polling overhead; BUSY-flag arbitration ensures deterministic write ordering during servo loop execution. | Use Scenario: DSP-FPGA co-processing system streaming sensor data for FFT analysis and filtering. IC Role / Device Role / Timing Role: High-bandwidth data exchange conduit with independent read/write ports preventing FIFO bottlenecks. Use Value: 55 ns tRC enables sustained 18.2 MB/s throughput per port, matching ADC sampling rates up to 2.27 MSPS. |
| Industrial PLC I/O Module | Redundant Communication Controller |
Use Scenario: Hot-swappable I/O module requiring synchronized state mirroring between primary and backup controllers. IC Role / Device Role / Timing Role: Non-volatile shared memory storing I/O configuration and real-time status with 2 V data retention. Use Value: Maintains operational state during main power interruption; ISB1 = 13 mA typ. extends battery life beyond 72 hours. | Use Scenario: Dual-RS485 gateway where primary and secondary controllers share protocol stack state. IC Role / Device Role / Timing Role: Semaphore-controlled memory region coordinating message queue access and error recovery handshaking. Use Value: Hardware semaphores prevent race conditions during failover; tSPS = 5 ns ensures reliable flag contention resolution. |
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, 8K × 16 organization, 3.3 V supply only | Requires voltage translation in 5 V systems; wider bus reduces chip count for 16-bit interfaces | Select when migrating to 3.3 V infrastructure and needing native 16-bit width |
| AS7C38098B-55PCN | 55 ns access, 8K × 8, 3.3 V supply, commercial temp only (0°C to +70°C) | Lacks industrial temperature rating and BUSY arbitration logic; no M/S cascade support | Choose only for cost-sensitive commercial designs without real-time arbitration needs |
Compared with CY7C028V-55AXC and AS7C38098B-55PCN, the 7005S55PFI8 uniquely delivers 5 V TTL compatibility, –40°C to +85°C operation, and integrated BUSY/semaphore arbitration-enabling drop-in replacement in legacy industrial dual-processor systems without redesigning power or timing logic.
Availability
7005S55PFI8 is available at Aetrix Electronics and suitable for motor control systems, digital signal processor interfaces, industrial PLC I/O modules, and redundant communication controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 7005S55PFI8 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.
The IDT7005 family was designed specifically for real-time embedded systems requiring deterministic inter-processor communication, featuring hardware arbitration, semaphore support, and battery backup-targeting industrial automation, aerospace, and telecommunications infrastructure.
FAQ
What is the maximum operating frequency supported by the 7005S55PFI8?
The 7005S55PFI8 does not operate on a clock; it is an asynchronous SRAM. Its maximum sustained data rate is determined by the 55 ns read cycle time (tRC), enabling up to 18.2 million 8-bit words per second per port. This timing is guaranteed over the full –40°C to +85°C industrial temperature range with 5.0 V ±10% supply.
How does the BUSY arbitration logic function in the 7005S55PFI8?
In the 7005S55PFI8, BUSY arbitration prevents conflicting writes: when M/S = HIGH (master), BUSYL and BUSYR are outputs that go LOW if the opposite port initiates a write to the same address. When M/S = LOW (slave), BUSYL/BUSYR become inputs that inhibit local writes when driven LOW by a master. The tBDD parameter (≤40 ns) defines the delay from BUSY deassertion to valid read data.
Can the 7005S55PFI8 be used in battery backup applications?
Yes, the 7005S55PFI8 supports battery backup with data retention down to 2.0 V (VDR), drawing ≤4000 µA (ICCDR) in retention mode. This allows continuous memory preservation during main power loss-critical for industrial controllers and telecom systems requiring state recovery after brownouts.
What package type is used for the 7005S55PFI8?
The 7005S55PFI8 uses a 64-pin thin quad flatpack (TQFP) with 0.5 mm lead pitch and 14 mm × 14 mm body size. Pin layout matches the standard IDT7005 TQFP footprint, and thermal pad grounding is not required per the datasheet. Decoupling capacitors must be placed adjacent to each VCC pin.
Does the 7005S55PFI8 support semaphore functionality, and how is it implemented?
Yes, the 7005S55PFI8 implements eight hardware semaphore flags accessed via SEML/SEMR enable and A0–A2 address lines. Writing to I/O0 sets a flag; reading I/O0–I/O7 returns flag status. This enables atomic test-and-set operations between processors without software intervention, with tSOP = 15 ns pulse width guaranteeing reliable flag updates.
7005S55PFI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 64Kbit
- Memory Organization:
- 8K 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:
- 64-TQFP (14x14)
7005S55PFI8 FAQ
1.How can I place an order for 7005S55PFI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7005S55PFI8 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 7005S55PFI8 reliable?
The price and inventory of 7005S55PFI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7005S55PFI8 is usually 5 days.
3.What payment methods are accepted for 7005S55PFI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7005S55PFI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7005S55PFI8?
7005S55PFI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7005S55PFI8 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 7005S55PFI8?
For technical support, including 7005S55PFI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7005S55PFI8 requirements.
6.How does Aetrix verify that 7005S55PFI8 is sourced from the original manufacturer or authorized distributors?
All 7005S55PFI8 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 7005S55PFI8 meets industry standards.
7.What is the process for return or replacement of 7005S55PFI8?
All 7005S55PFI8 units undergo pre-shipment inspection (PSI). If there is an issue with 7005S55PFI8, 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 7005S55PFI8 part is unused and in its original packaging.
Return procedure for 7005S55PFI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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