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Renesas 70V05S20J8
- Part No.:
- 70V05S20J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
70V05S20J8.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,430
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Product details
Overview
70V05S20J8 from IDT is a high-speed 3.3V 8K × 8 dual-port static RAM with true independent left/right ports, 20 ns maximum access time (industrial grade), 380 mW typical active power, and full on-chip semaphore and interrupt logic - deployed in real-time embedded systems requiring concurrent CPU and DSP memory access.
For engineers reviewing the 70V05S20J8 datasheet, 70V05S20J8 pinout, 70V05S20J8 application, or 70V05S20J8 equivalent, key selection criteria include bus arbitration timing (tAPS, tBDD), BUSY/INT flag behavior under contention, master/slave cascading support, and compatibility with 3.3V TTL-level control interfaces.
Technical Context
The 70V05S20J8 implements fully asynchronous dual-port operation with separate address, data, and control buses per port, enabling simultaneous read/write to any memory location without external arbitration logic. Its on-chip arbitration logic resolves port conflicts via BUSY flag assertion or semaphore signaling based on M/S pin configuration.
It supports two distinct operational modes: as a standalone 64K-bit dual-port SRAM, or in MASTER/SLAVE cascaded configurations for 16-bit+ data buses - where M/S = VIH enables BUSY output (master), and M/S = VIL enables BUSY input (slave) with automatic write inhibition during contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 8 (64 Kbit), dual-port, asynchronous |
| Access Time (max) | 20 ns - guarantees worst-case read latency at industrial temperature (−40°C to +85°C) |
| Supply Voltage | 3.3 V ± 0.3 V - single-supply TTL-compatible interface, no level-shifting required |
| Active Power (typ) | 380 mW - enables low-thermal footprint in dense PCB layouts |
| Standby Current (typ) | 660 μA - supports ultra-low-power sleep states when CE is deasserted |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade reliability in harsh environments |
| Package | 68-pin PLCC (J8 suffix) - surface-mount compatible with standard reflow profiles |
Pinout & Package
70V05S20J8 is housed in a 68-pin Plastic Leaded Chip Carrier (PLCC) package, measuring approximately 0.95 in × 0.95 in × 0.17 in, with gull-wing leads and body marking "70V05S20J8".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Asynchronous port activation; deassertion places respective port in high-impedance standby |
| OEL / OER | Output Enable (Left / Right) | Controls I/O drivers independently; allows one port to read while other writes |
| R/WL / R/WR | Read/Write Control (Left / Right) | Determines direction of data transfer per port; synchronous with CE and address setup |
| A0L–A12L / A0R–A12R | Address Inputs (Left / Right) | 13-bit addressing per port (8K = 2¹³); supports independent access to same or different locations |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O Bus (Left / Right) | 8-bit bidirectional data path per port; electrically isolated to prevent bus contention |
| BUSYL / BUSYR | Busy Flag (Left / Right) | Push-pull output (master) or input (slave); signals arbitration status during address/contention overlap |
| SEML / SEMR | Semaphore Enable (Left / Right) | Activates on-chip semaphore register bank (8 flags, addressed by A0–A2) for inter-port synchronization |
| INTL / INTR | Interrupt Flag (Left / Right) | Open-drain capable (per datasheet note); asserts when opposite port writes to dedicated interrupt address |
| M/S | Master/Slave Select | Configures BUSY pin function: VIH = BUSY output (master), VIL = BUSY input (slave) |
| VDD / VSS | Power / Ground | Multiple distributed VDD (pins 1, 12, 13, 27, 40, 41, 42, 43, 58, 59, 60, 63, 64) and VSS (pins 9, 22, 23, 24, 25, 26, 39, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 61, 62) pins ensure stable power delivery and low-noise operation |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port architecture | Enables simultaneous reads/writes to identical memory addresses without data corruption or external logic |
| On-chip semaphore logic | Provides eight hardware-managed flags (A0–A2 addressable) for deterministic inter-processor resource locking |
| Automatic port arbitration | Resolves contention via BUSY flag assertion within defined timing windows (tAPS, tBDD), eliminating software polling |
| Master/Slave cascading | Supports 16-bit+ word expansion using M/S pin; eliminates discrete glue logic in wide-bus systems |
| Interrupt generation | Hardware-triggered INTL/INTR pulses on dedicated address writes - enables event-driven firmware response |
| Low-power standby mode | 660 μW typical consumption with CE high - critical for battery-backed or energy-constrained applications |
Applications
| Industrial Motion Controller | Digital Signal Processor Interface |
|---|---|
|
Use Scenario: Real-time coordination between motion control CPU and servo drive FPGA, sharing position/velocity buffers. IC Role / Device Role / Timing Role: Dual-port SRAM acts as shared memory buffer with deterministic arbitration; BUSY flags prevent race conditions during simultaneous access. Use Value: Eliminates need for external arbitration logic and reduces system latency by up to 15 ns versus discrete latch + logic solutions. |
Use Scenario: High-throughput data exchange between DSP core and host microcontroller in audio processing equipment. IC Role / Device Role / Timing Role: Provides zero-wait-state memory access for both processors; semaphore flags coordinate FFT buffer ownership. Use Value: Enables sustained 20 ns read cycles across both ports, supporting >50 MB/s aggregate bandwidth without pipeline stalls. |
| Redundant Communication Module | Test & Measurement Instrumentation |
|
Use Scenario: Dual-CPU failover system where primary and backup controllers maintain synchronized state in shared memory. IC Role / Device Role / Timing Role: Acts as fault-tolerant memory hub; interrupt flags signal state updates; M/S configuration enables hot-swap detection. Use Value: Guarantees atomic state transfers via semaphore-controlled writes, preventing partial updates during switchover. |
Use Scenario: Oscilloscope acquisition engine buffering waveform samples between ADC front-end and analysis processor. IC Role / Device Role / Timing Role: Serves as ping-pong buffer with left port capturing samples and right port transferring to host; BUSY prevents overwrites. Use Value: Supports continuous 20 ns sampling-to-transfer latency, enabling real-time display update rates >100 kS/s. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C024AV-20AXC | 20 ns access, 8K × 16 organization, 3.3 V supply, TQFP-100 package | Wider data bus (16-bit) but larger footprint; lacks integrated semaphore logic - requires external arbitration | Select when 16-bit native bus width is required and board space permits larger package; verify external semaphore implementation. |
| IDT70V25L25PF | 25 ns access, 16K × 16 organization, 3.3 V supply, 100-pin TQFP | Higher density and slower speed; includes identical semaphore/interrupt features but not pin-compatible | Choose for higher memory capacity needs where 25 ns latency is acceptable; requires PCB redesign due to different pin count and layout. |
Compared with CY7C024AV-20AXC and IDT70V25L25PF, the 70V05S20J8 uniquely delivers 8K × 8 dual-port functionality in a compact 68-pin PLCC with full on-chip arbitration - making it optimal for space-constrained industrial controllers needing deterministic 20 ns performance without external logic.
Availability
70V05S20J8 is available at Aetrix Electronics and suitable for industrial motion control, digital signal processing, and redundant communication modules requiring stable component supply across extended product lifecycles.
Supply support for 70V05S20J8 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 high-performance memory, timing, and interface ICs for communications, computing, and industrial markets.
The 70V05S20J8 belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic real-time systems where concurrent processor access, hardware arbitration, and industrial temperature resilience are mandatory.
FAQ
What is the operating voltage range for the 70V05S20J8?
The 70V05S20J8 operates from a single 3.3 V supply with a tolerance of ±0.3 V (3.0 V to 3.6 V). This matches standard 3.3 V TTL logic levels, eliminating the need for voltage translation when interfacing with contemporary microcontrollers and FPGAs. Operation outside this range may cause functional failure or permanent damage, as specified in the Absolute Maximum Ratings table.
How does the M/S pin affect BUSY pin behavior on the 70V05S20J8?
On the 70V05S20J8, the M/S pin configures BUSY pin functionality: when M/S = VIH, BUSYL and BUSYR operate as push-pull outputs indicating local port contention status; when M/S = VIL, they become inputs that inhibit writes on the slave port if asserted by the master. This enables flexible master/slave cascading without external logic.
Can the 70V05S20J8 support simultaneous read operations from both ports to the same memory address?
Yes, the 70V05S20J8 supports true simultaneous reads to the same memory address from both ports without conflict or timing penalty. Its dual-port memory cell architecture ensures independent, fully asynchronous access - a core feature confirmed in the Functional Block Diagram and Truth Table I, where BUSY has no relation to valid output data during non-contention reads.
What is the purpose of the semaphore function in the 70V05S20J8?
The semaphore function in the 70V05S20J8 provides eight hardware-managed flags (addressed by A0–A2) for inter-port synchronization. When enabled via SEML/SEMR, these flags allow one port to lock a shared resource (e.g., a buffer or register) while the other waits - ensuring atomic operations without software polling or external logic, as detailed in Truth Table II and the Semaphore Read/Write Control section.
Is the 70V05S20J8 pin-compatible with other members of the IDT70V05 family?
No - the 70V05S20J8 uses a 68-pin PLCC package (J8 suffix), whereas other variants like the 70V05S20PFI use 64-pin TQFP or 100-pin TQFP packages. Pin counts, physical dimensions, and thermal characteristics differ significantly; direct PCB replacement is not possible without layout revision, even though electrical functionality and timing parameters align closely across the family.
70V05S20J8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 68-LCC (J-Lead)
- 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:
- 20ns
- Access Time:
- 20 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 68-PLCC (24.21x24.21)
70V05S20J8 FAQ
1.How can I place an order for 70V05S20J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V05S20J8 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 70V05S20J8 reliable?
The price and inventory of 70V05S20J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V05S20J8 is usually 5 days.
3.What payment methods are accepted for 70V05S20J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V05S20J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V05S20J8?
70V05S20J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V05S20J8 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 70V05S20J8?
For technical support, including 70V05S20J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V05S20J8 requirements.
6.How does Aetrix verify that 70V05S20J8 is sourced from the original manufacturer or authorized distributors?
All 70V05S20J8 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 70V05S20J8 meets industry standards.
7.What is the process for return or replacement of 70V05S20J8?
All 70V05S20J8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V05S20J8, 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 70V05S20J8 part is unused and in its original packaging.
Return procedure for 70V05S20J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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