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Renesas 70V05S55PF8
- Part No.:
- 70V05S55PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
70V05S55PF8.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
70V05S55PF8 from IDT (now Renesas) is a high-speed 3.3V 8K × 8 dual-port static RAM with true independent left/right ports, 55 ns maximum access time, industrial temperature range (–40°C to +85°C), and integrated semaphore/arbiter logic - used in real-time embedded systems requiring concurrent CPU/DSP memory access without external glue logic.
For engineers reviewing the 70V05S55PF8 datasheet, 70V05S55PF8 pinout, 70V05S55PF8 application, or 70V05S55PF8 equivalent, key selection considerations include dual-port arbitration timing (tAPS, tBDD), BUSY flag behavior under M/S configuration, 3.3V-only operation, and TQFP-64 package compatibility with legacy IDT70V05 designs.
Technical Context
The 70V05S55PF8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling simultaneous read/write operations to the same or different memory locations. Its on-chip arbitration logic resolves contention via BUSY signaling and supports MASTER/SLAVE cascading for 16-bit+ data bus expansion.
It integrates full hardware semaphore support (8 flags, addressed via A0–A2), interrupt generation (INTL/INTR), and automatic power-down via CE-controlled standby mode. All timing parameters-including tRC = 55 ns, tAA = 55 ns, and tBDD-apply specifically to the S-grade (55 ns) industrial variant in TQFP-64 packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 8 (64 Kbit), dual-port SRAM with independent left/right address/data/control paths |
| Access Time (tAA / tRC) | 55 ns max - guarantees deterministic read latency for real-time DSP/CPU co-processing |
| Supply Voltage | 3.3 V ± 0.3 V only - requires dedicated 3.3V rail; no 5V tolerance or mixed-voltage operation |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Standby Current (ISB) | 25 μA typ. - enables low-power sleep modes in battery-backed or energy-sensitive systems |
| Package | 64-pin TQFP (PNG64), 14 mm × 14 mm × 1.4 mm - surface-mount compatible with standard reflow profiles |
| Arbitration Support | Hardware BUSY flag (BUSYL/BUSYR), semaphore registers (8 flags), and interrupt outputs (INTL/INTR) |
Pinout & Package
70V05S55PF8 is housed in a 64-pin thin quad flatpack (TQFP, package code PNG64), with 32 pins assigned to each port (left/right), plus shared power/ground and control signals. Pin functions are strictly asymmetric: left-port signals (e.g., A0L–A12L, I/O0L–I/O7L, CEL, OEL, R/WL) and right-port signals (A0R–A12R, I/O0R–I/O7R, CER, OER, R/WR) occupy dedicated pin groups; M/S, SEM, INT, and BUSY pins serve cross-port coordination.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A12L | Left-port address inputs | 13-bit address bus for 8K-word left-port access; must be stable before CE/OE assertion |
| I/O0L–I/O7L | Left-port bidirectional data | 8-bit data path; tri-stated when OEL = VIH or during write contention with BUSY asserted |
| CEL, OEL, R/WL | Left-port control enables | Chip enable, output enable, and read/write direction - all active-low; define left-port operational state |
| A0R–A12R | Right-port address inputs | Independent 13-bit address bus; timing referenced to CER/R/WR, not left-port signals |
| I/O0R–I/O7R | Right-port bidirectional data | Electrically isolated 8-bit path; no internal coupling to left-port I/O lines |
| CER, OER, R/WR | Right-port control enables | Functionally identical to left-port controls but with separate timing domains and arbitration interaction |
| M/S | Master/Slave select | VIH configures BUSYL/BUSYR as outputs (MASTER); VIL configures them as inputs (SLAVE) for daisy-chain arbitration |
| SEML/SEMR | Semaphore enable | Active-low enables semaphore register access; required with CE = VIH to read/write semaphore flags |
| INTL/INTR | Interrupt outputs | Push-pull outputs asserting on semaphore or address-match events; require external pull-up for open-drain emulation |
| BUSYL/BUSYR | Port arbitration flags | Push-pull outputs (MASTER) or inputs (SLAVE); indicate write contention at matching addresses; drive external wait-state logic |
| VDD, VSS | Power and ground | All VDD pins (12 total) must be decoupled locally; all VSS pins (12 total) require low-impedance ground plane connection |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port memory cells | Enables simultaneous reads/writes to same location without external arbitration logic or cycle penalties |
| On-chip port arbitration | Hardware-resolved BUSY flag generation eliminates need for external latches or FPGA-based arbiters |
| Full semaphore support | Eight dedicated hardware semaphore registers (A0–A2 addressable) simplify inter-processor synchronization in multi-CPU systems |
| MASTER/SLAVE cascading | Allows seamless 16-bit+ word expansion using M/S pin; no additional decode logic required for width scaling |
| 3.3V-only CMOS process | Reduces system power vs. 5V SRAMs; eliminates level-shifting components in modern low-voltage designs |
| Industrial temperature grade | Validated operation across –40°C to +85°C ensures reliability in motor drives, telecom line cards, and industrial PLCs |
Applications
| Motor Control System | Digital Signal Processor Interface |
|---|---|
|
Use Scenario: Real-time servo loop execution where FPGA handles PWM generation and ARM Cortex-M4 runs motion algorithms - both require concurrent, low-latency access to shared trajectory tables and status registers. IC Role / Device Role / Timing Role: Dual-port SRAM acts as shared memory buffer; left port serves FPGA, right port serves MCU; BUSY flag prevents write collisions during position update bursts. Use Value: Eliminates software semaphores and polling delays; 55 ns access enables sub-10 μs loop updates at 100 kHz servo rates. |
Use Scenario: High-throughput audio processing pipeline where DSP writes filtered samples to memory while host processor reads results for display or network transmission. IC Role / Device Role / Timing Role: 70V05S55PF8 provides non-blocking memory conduit; DSP uses left port for burst writes, host uses right port for sequential reads - no bus turnaround overhead. Use Value: Sustains 12.8 MB/s sustained bandwidth (8 bytes × 1.6 MHz) without DMA stalls or FIFO buffering complexity. |
| Telecom Line Card Buffer | Industrial PLC Data Exchange |
|
Use Scenario: Packet buffering in a T1/E1 framer card where one port services the framer ASIC and the other serves the control CPU for statistics collection and alarm handling. IC Role / Device Role / Timing Role: Acts as zero-wait-state packet store; framer writes incoming frames, CPU reads counters and error logs - semaphore flags coordinate access to shared status registers. Use Value: Prevents frame loss during CPU interrupt servicing; 8 semaphore registers allow independent locking of 8 distinct telemetry variables. |
Use Scenario: Deterministic I/O mapping between safety PLC CPU and fieldbus master, where cyclic process data must be exchanged without jitter or race conditions. IC Role / Device Role / Timing Role: Shared memory hub; safety CPU writes sensor inputs to left port, fieldbus controller reads via right port - BUSY arbitration enforces atomic 8-byte transfers. Use Value: Guarantees cycle-consistent data snapshots; eliminates need for redundant buffers or time-synchronized handshaking protocols. |
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, 100-pin TQFP; requires external byte-enable logic for 8-bit interface | Targets wider data paths; lacks integrated semaphore logic - needs FPGA or microcontroller to emulate flag registers | Select when 16-bit bus width is mandatory and arbitration can be implemented in programmable logic |
| AS7C38098B-55PCN | 55 ns access, 8K × 8, 64-pin TQFP; no BUSY/semaphore/interrupt pins - basic dual-port only | Supports simple dual-CPU sharing but cannot resolve contention or synchronize tasks without external logic | Choose for cost-sensitive applications where arbitration is handled entirely in software or external CPLD |
Compared with CY7C028V-55AXC and AS7C38098B-55PCN, the 70V05S55PF8 delivers integrated hardware arbitration and semaphore management in a pin-compatible 64-pin footprint - reducing BOM count, PCB area, and firmware complexity for real-time deterministic systems.
Availability
70V05S55PF8 is available at Aetrix Electronics and suitable for industrial motor control, telecom infrastructure, medical imaging subsystems, and aerospace avionics requiring stable component supply across extended product lifecycles.
Supply support for 70V05S55PF8 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
Renesas Electronics (formerly Integrated Device Technology) is a global semiconductor leader specializing in microcontrollers, analog, power management, and memory solutions for industrial, automotive, and communications markets.
The 70V05S55PF8 belongs to IDT's legacy dual-port SRAM family, engineered for deterministic real-time systems where concurrent processor access, hardware arbitration, and industrial reliability are critical - not general-purpose memory replacement.
FAQ
What is the maximum operating frequency supported by the 70V05S55PF8?
The 70V05S55PF8 does not operate at a fixed clock frequency; it is an asynchronous SRAM. Its performance is defined by access time: 55 ns maximum (tAA/tRC). This supports effective throughput up to approximately 18.2 MHz random read cycles (1/55 ns), assuming ideal bus timing and no wait states. Actual system bandwidth depends on CE/OE assertion timing and bus protocol overhead.
Does the 70V05S55PF8 support 5V logic interfaces?
No. The 70V05S55PF8 is a 3.3V-only device with absolute maximum input voltage of VDD + 0.3 V (≤3.6 V). Applying 5V signals to any pin - including address, data, or control lines - risks permanent damage. Level translation is mandatory when interfacing with 5V microcontrollers or FPGAs.
How does the BUSY arbitration work when both ports attempt to write to the same address?
When both ports assert CE and target the same address, the 70V05S55PF8 uses address-match arbitration: the port whose address/control signals stabilize first asserts its BUSY output (if MASTER) or detects BUSY assertion (if SLAVE), blocking its write. The winning port completes the write; the losing port's data is ignored. Timing parameter tAPS (Address Setup before Arbitration) defines the minimum setup margin required to guarantee deterministic resolution.
Can the 70V05S55PF8 be used in MASTER/SLAVE configuration with devices of different speed grades?
No. MASTER/SLAVE cascading requires matched access timing across all devices in the chain. Mixing 55 ns (70V05S55PF8) and slower variants (e.g., 70V05L-70) violates tBDD and tDDD timing margins, leading to unpredictable BUSY assertion and potential data corruption. Only identical speed-grade parts should be cascaded.
Is the 70V05S55PF8 RoHS-compliant and halogen-free?
Yes. The 70V05S55PF8 is manufactured as a green part per IDT's ordering information - compliant with RoHS Directive 2011/65/EU and JEDEC JS709A for halogen content (<900 ppm bromine, <900 ppm chlorine). The TQFP package uses matte tin lead finish and lead-free solder reflow profiles.
70V05S55PF8 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:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (14x14)
70V05S55PF8 FAQ
1.How can I place an order for 70V05S55PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V05S55PF8 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 70V05S55PF8 reliable?
The price and inventory of 70V05S55PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V05S55PF8 is usually 5 days.
3.What payment methods are accepted for 70V05S55PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V05S55PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V05S55PF8?
70V05S55PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V05S55PF8 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 70V05S55PF8?
For technical support, including 70V05S55PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V05S55PF8 requirements.
6.How does Aetrix verify that 70V05S55PF8 is sourced from the original manufacturer or authorized distributors?
All 70V05S55PF8 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 70V05S55PF8 meets industry standards.
7.What is the process for return or replacement of 70V05S55PF8?
All 70V05S55PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V05S55PF8, 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 70V05S55PF8 part is unused and in its original packaging.
Return procedure for 70V05S55PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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