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Renesas 71342SA70JI8
- Part No.:
- 71342SA70JI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71342SA70JI8.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,927
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Product details
Overview
IDT71342SA70JI8 from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 70 ns max read cycle time, supporting independent asynchronous access from left and right ports, and featuring TTL-compatible 5V ±10% supply - used in real-time interprocessor communication systems requiring concurrent memory access without arbitration delay.
For engineers reviewing the IDT71342SA70JI8 datasheet, IDT71342SA70JI8 pinout, IDT71342SA70JI8 application, or IDT71342SA70JI8 equivalent, this device delivers deterministic port-to-port timing (tDDD = 70 ns), hardware semaphore contention resolution (tSPS = 10 ns), and industrial-grade reliability (-40°C to +85°C) in a 64-pin TQFP package for embedded multiprocessor designs.
Technical Context
The IDT71342SA70JI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling simultaneous read/write operations across ports without bus contention. Its dedicated 3-bit address space (A0–A2) selects one of eight semaphore latches, accessed only when SEM = VIH and CE = VIL - distinct from main memory addressing (A0–A11).
Semaphore logic uses cross-coupled request latches with priority resolution: simultaneous zero-write requests guarantee exclusive token assignment to one port within 10 ns (tSPS), while data retention is not supported (SA variant lacks battery backup). Power management relies on CE/SEM-controlled CMOS-level standby (ISB3 = 1.0 mA typ.) and TTL-level standby (ISB1 = 25 mA typ.).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 8 bits (4096 words × 8-bit data width) - supports full-word parallel access per port |
| Max Read Cycle Time (tRC) | 70 ns - defines minimum interval between successive reads on same port |
| Max Write Cycle Time (tWC) | 70 ns - sets minimum duration for reliable write completion on either port |
| Operating Voltage | 5.0 V ±10% - compatible with legacy TTL logic families without level shifting |
| Temperature Range | -40°C to +85°C - qualified for industrial environments with no derating |
| Standby Current (ISB3) | 1.0 mA typical - achieved when both CE and SEM inputs exceed VCC − 0.2 V |
| Semaphore Access Time (tSAA) | 70 ns max - latency to read/write semaphore flag after valid address setup |
Pinout & Package
Package: 64-pin TQFP (PNG64), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A11L | Left port address inputs | 12-bit address bus for left-side memory access (4K = 2¹²) |
| A0R–A11R | Right port address inputs | Independent 12-bit address bus for right-side memory access |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit parallel data path; high-impedance when OE = VIH or CE = VIH |
| I/O0R–I/O7R | Right port bidirectional data | Electrically isolated 8-bit data path with independent output enable |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; disables I/O drivers and reduces ICC when HIGH |
| OEL / OER | Output enable (left/right) | Active-low controls output buffer state; allows read-only access without disabling port |
| R/WL / R/WR | Read/write control (left/right) | Active-low initiates write; HIGH enables read operation on corresponding port |
| SEML / SEMR | Semaphore enable (left/right) | Active-low selects semaphore register space (A0–A2 only); disables main memory access |
| VCC | Power supply | Single 5V ±10% supply; all VCC pins must be connected to decoupled source |
| GND | Ground reference | All GND pins require low-inductance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Hardware semaphore arbitration | Eight independent binary flags with guaranteed single-winner resolution (tSPS = 10 ns) for interprocessor resource locking |
| Dual-port concurrency | Fully asynchronous operation: simultaneous read/write across ports with no shared timing constraints |
| Low-power standby modes | Four defined standby states (ISB1–ISB4) enabling selective port shutdown to reduce system power by >95% |
| TTL-compatible interface | VIH = 2.2 V min, VIL = 0.8 V max - interoperable with 5V microcontrollers and FPGAs without translators |
| Industrial temperature rating | Validated operation from -40°C to +85°C with no parameter derating - suitable for harsh-environment control systems |
Applications
| Real-Time Motion Control | Avionics Data Exchange |
|---|---|
Use Scenario: Two synchronized DSPs coordinate motor phase sequencing and sensor feedback in CNC machinery. IC Role / Device Role / Timing Role: Dual-port RAM serves as shared command buffer with hardware semaphore enforcing strict write-ordering between motion planner and servo controller. Use Value: Eliminates software polling delays; 70 ns tDDD ensures sub-microsecond interprocessor handshaking for 20 kHz servo loop updates. |
Use Scenario: Flight management computer and autopilot exchange navigation waypoints and status flags via shared memory. IC Role / Device Role / Timing Role: IDT71342SA70JI8 provides fault-isolated dual-port storage with deterministic semaphore arbitration for safety-critical data handoff. Use Value: tSPS = 10 ns prevents race conditions during simultaneous flag access; industrial temp range supports extended operation in unpressurized avionics bays. |
| Industrial PLC Backplane | Medical Imaging Pipeline |
Use Scenario: Modular PLC rack uses multiple CPUs to manage I/O scanning, logic execution, and HMI updates over common memory. IC Role / Device Role / Timing Role: IDT71342SA70JI8 acts as central data hub with left/right ports assigned to master CPU and slave I/O processor. Use Value: Asynchronous access avoids bus contention; ISB3 = 1.0 mA standby current extends uptime during idle cycles in energy-constrained cabinets. |
Use Scenario: MRI subsystem transfers raw k-space data from ADC array to reconstruction engine using ping-pong buffering. IC Role / Device Role / Timing Role: Dual-port RAM buffers streaming 16-bit pixel data while semaphores coordinate buffer ownership between acquisition and processing cores. Use Value: 70 ns tRC enables sustained 14.3 MB/s throughput per port; TTL compatibility simplifies integration with legacy FPGA-based front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1352BV-70AC | 70 ns access, 4K × 8, but uses separate BUSY pin instead of integrated semaphore logic | Requires external arbitration logic for interprocessor coordination; increases PCB area and firmware complexity | Select when existing design already implements semaphore in FPGA or when lower cost outweighs integrated feature benefit |
| IDT71322SA70JI | Same family, 2K × 8 organization, identical 70 ns timing and pinout - smaller memory depth | Reduces memory footprint by 50%; suitable for systems with constrained address space or lower bandwidth needs | Choose when application requires <4K words and board layout reuse is critical; shares identical timing and thermal profile |
Compared with CY7C1352BV-70AC and IDT71322SA70JI, the IDT71342SA70JI8 uniquely combines full 4K × 8 capacity, hardware semaphore resolution, and industrial temperature support in a single 64-pin TQFP - eliminating need for discrete arbitration logic while maintaining pin compatibility with other IDT713xx variants.
Availability
IDT71342SA70JI8 is available at Aetrix Electronics and suitable for real-time motion control, avionics data exchange, and industrial PLC backplane applications requiring stable component supply across extended production lifecycles.
Supply support for IDT71342SA70JI8 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
Integrated Device Technology (IDT), now part of Renesas Electronics, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.
IDT71342SA70JI8 belongs to the IDT713xx dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in tightly coupled multiprocessor systems where software arbitration introduces unacceptable latency.
FAQ
What is the maximum operating temperature range for IDT71342SA70JI8?
IDT71342SA70JI8 is rated for industrial temperature operation from -40°C to +85°C, with all electrical specifications guaranteed across this range without derating. This makes it suitable for deployment in factory automation controllers, outdoor telecom equipment, and transportation systems where ambient temperatures exceed commercial limits.
Does IDT71342SA70JI8 support battery backup for data retention?
No, IDT71342SA70JI8 does not support battery backup data retention. It is the SA (standard power) variant; only LA versions (e.g., IDT71342LA70JI8) include 2V data retention capability. The SA variant draws 1.0 mA typical in full standby (ISB3) but requires continuous VCC to maintain memory contents.
How is semaphore access enabled on IDT71342SA70JI8?
Semaphore access on IDT71342SA70JI8 is enabled by asserting SEM = VIH (active-low logic) while holding CE = VIL. Address lines A0–A2 select one of eight semaphore flags; only I/O0 is used for writing, and all I/O pins reflect the flag state during read. Main memory access is disabled during semaphore operation.
What is the meaning of "70" in the part number IDT71342SA70JI8?
The "70" in IDT71342SA70JI8 specifies the maximum read cycle time (tRC) of 70 ns. This value appears consistently across AC timing parameters including tAA, tACE, tSAA, and tWC - defining the speed grade for both SRAM and semaphore access under industrial temperature conditions.
Can both ports of IDT71342SA70JI8 perform simultaneous writes to the same memory location?
No - simultaneous writes to the same non-semaphore memory location by both ports result in undefined data. The device does not implement hardware write collision detection or resolution. System firmware must use semaphore flags to serialize access to shared memory regions, ensuring deterministic behavior and data integrity.
71342SA70JI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-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:
- 32Kbit
- Memory Organization:
- 4K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 70ns
- Access Time:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
71342SA70JI8 FAQ
1.How can I place an order for 71342SA70JI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71342SA70JI8 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 71342SA70JI8 reliable?
The price and inventory of 71342SA70JI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71342SA70JI8 is usually 5 days.
3.What payment methods are accepted for 71342SA70JI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71342SA70JI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71342SA70JI8?
71342SA70JI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71342SA70JI8 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 71342SA70JI8?
For technical support, including 71342SA70JI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71342SA70JI8 requirements.
6.How does Aetrix verify that 71342SA70JI8 is sourced from the original manufacturer or authorized distributors?
All 71342SA70JI8 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 71342SA70JI8 meets industry standards.
7.What is the process for return or replacement of 71342SA70JI8?
All 71342SA70JI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71342SA70JI8, 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 71342SA70JI8 part is unused and in its original packaging.
Return procedure for 71342SA70JI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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