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Renesas 71342SA45J8
- Part No.:
- 71342SA45J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71342SA45J8.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,600
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Product details
Overview
IDT71342SA45J8 from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 45 ns max read cycle time, 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports fully asynchronous, independent access from left and right ports and enables interprocessor resource arbitration in real-time embedded control systems.
For engineers reviewing the IDT71342SA45J8 datasheet, IDT71342SA45J8 pinout, IDT71342SA45J8 application, or IDT71342SA45J8 equivalent, key selection criteria include dual-port timing compatibility, semaphore flag coherency under concurrent access, 52-pin PLCC package footprint, and TTL-level interface compliance for legacy bus interfacing.
Technical Context
The IDT71342SA45J8 implements two independent CMOS SRAM ports sharing a single 4K × 8 memory array, with dedicated 3-bit address space (A0–A2) for eight hardware semaphore latches. Semaphore access requires SEM = VIL while SRAM access requires SEM = VIH - enabling strict functional separation between data and synchronization logic.
Each port features separate CE, OE, R/W, and address/control lines, allowing simultaneous read/write operations unless targeting the same non-semaphore memory location. Power-down is controlled per port via CE and SEM high states, achieving full standby current as low as 1.0 mA (typ.) at CMOS input levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 8 bits (32 Kbit total), dual-port architecture with independent left/right I/O and control |
| Access Time (tAA) | 45 ns max - defines minimum address setup-to-data-valid delay for reliable high-speed bus interfacing |
| Read Cycle Time (tRC) | 45 ns max - sets shortest interval between successive reads without violating timing margins |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard TTL/CMOS 5 V systems; no level-shifting required |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and communications equipment |
| Standby Current (ISB3) | 1.0 mA (typ.) - enables ultra-low-power sleep mode when both ports are deselected with CMOS-level inputs |
| Semaphore Logic | 8 independent binary flags with automatic contention resolution - eliminates software polling overhead in multi-processor resource locking |
Pinout & Package
Package: 52-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 20.0 mm × 20.0 mm × 4.3 mm, lead pitch 0.635 mm, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A11L | Left port address inputs | 12-bit address bus for left-side memory access; A0–A2 also select one of eight semaphore flags when SEM = VIL |
| A0R–A11R | Right port address inputs | 12-bit address bus for right-side memory access; independent of left port timing and state |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit TTL-compatible data path; high-impedance when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit TTL-compatible data path; isolated from left port during concurrent operation |
| CEL / CER | Left/right chip enable | Active-low enables respective port; controls power-down entry when high (with SEM high) |
| OEL / OER | Left/right output enable | Active-low enables data output drivers; determines Z-state timing (tLZ/tHZ) |
| R/WL / R/WR | Left/right write enable | Active-low initiates write cycle; must overlap CE low for valid write (tEW ≥ 40 ns) |
| SEML / SEMR | Semaphore flag status outputs | Active-low open-collector outputs indicating token ownership; require external pull-up for logic-level compatibility |
| SEM | Semaphore select | Active-low chip select for semaphore register space; disables SRAM access when asserted |
| VCC / GND | Power supply | All VCC pins must be connected to 5 V ±10%; all GND pins tied to common ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Fully asynchronous dual-port operation | Enables deterministic, zero-wait-state communication between independent processors without shared clock constraints |
| Hardware semaphore logic with contention resolution | Guarantees exclusive token assignment on simultaneous requests - eliminates race conditions in lock-free interprocessor protocols |
| Separate SRAM and semaphore address spaces | Prevents accidental overwrites: semaphore access (A0–A2 only, SEM = VIL) is electrically isolated from main memory access |
| Low-power standby modes | Full standby current ≤1.0 mA (typ.) reduces system-level power budget in idle or event-driven architectures |
| TTL-compatible 5 V interface | Direct connection to legacy microcontrollers, FPGAs, and ASICs without level-shifting circuitry or signal conditioning |
Applications
| Industrial PLC Backplane Interface | Avionics Dual-Processor Data Exchange |
|---|---|
Use Scenario: Two independent CPUs share I/O configuration tables and real-time sensor buffers across a rigid backplane bus. IC Role / Device Role / Timing Role: IDT71342SA45J8 serves as synchronized shared memory with hardware-enforced mutual exclusion via semaphore flags. Use Value: Eliminates software arbitration delays; ensures deterministic <45 ns memory access latency for motion control loop updates. |
Use Scenario: Flight management unit (FMU) and health monitoring processor exchange telemetry and fault logs in DO-254-certified avionics hardware. IC Role / Device Role / Timing Role: IDT71342SA45J8 provides fault-tolerant dual-port RAM with atomic semaphore signaling for cross-processor critical section protection. Use Value: Prevents data corruption during concurrent read/write; meets AS6019 timing requirements for airborne data coherency. |
| Medical Imaging Frame Buffer Arbitration | Telecom Line Card Control Plane Sync |
Use Scenario: Image acquisition engine and display rendering engine concurrently access rolling frame buffers in ultrasound or MRI systems. IC Role / Device Role / Timing Role: IDT71342SA45J8 acts as low-latency dual-port buffer with hardware semaphore coordination for frame ownership handoff. Use Value: Enables uninterrupted 60+ fps imaging pipeline; avoids dropped frames caused by software-based spinlock jitter. |
Use Scenario: Control processor and packet forwarding ASIC coordinate routing table updates and statistics collection in carrier-grade line cards. IC Role / Device Role / Timing Role: IDT71342SA45J8 functions as shared configuration memory with semaphore-controlled write serialization to prevent inconsistent state transitions. Use Value: Guarantees atomic update visibility across domains; satisfies ITU-T G.8032 Ethernet ring protection timing constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM with semaphore applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C024AV-45AXC | 4K × 16 organization, 45 ns access, 3.3 V supply only; no integrated semaphore logic - requires external arbitration logic | Suitable for wider data paths but lacks hardware semaphore; increases PCB area and firmware complexity for lock management | Choose only if 16-bit bus width is mandatory and external semaphore implementation is acceptable |
| IDT71322LA45JG | 2K × 8 organization, same 45 ns speed and 52-pin PLCC package; includes semaphore but half memory depth | Valid drop-in replacement where 2K × 8 capacity suffices; lower density reduces cost and power in space-constrained designs | Select when application memory footprint fits within 2K and pin compatibility is prioritized over capacity |
Compared with CY7C024AV-45AXC and IDT71322LA45JG, the IDT71342SA45J8 uniquely delivers 4K × 8 density with integrated semaphores in a 5 V, industrial-temp PLCC package - making it optimal for legacy 5 V systems requiring full hardware arbitration without redesigning support logic.
Availability
IDT71342SA45J8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, avionics data exchange, medical imaging buffers, and telecom line card control planes requiring stable component supply across extended product lifecycles.
Supply support for IDT71342SA45J8 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, is a fabless semiconductor company specializing in timing, memory interface, and RF power solutions for high-performance computing and communications infrastructure.
The IDT71342 family was designed specifically for deterministic, low-latency interprocessor communication in real-time embedded systems - emphasizing hardware semaphore reliability, dual-port timing independence, and industrial environmental robustness.
FAQ
What is the maximum operating temperature range for the IDT71342SA45J8?
The IDT71342SA45J8 is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings table and DC Electrical Characteristics section of the official datasheet, and applies across all timing grades including the 45 ns version. The device maintains full functionality and timing compliance throughout this range without derating.
Does the IDT71342SA45J8 support battery backup data retention?
No, the IDT71342SA45J8 does not support battery backup data retention. That feature is exclusive to the LA variant (e.g., IDT71342LA), which specifies 2 V data retention capability. The SA suffix denotes standard power operation only, with no guaranteed retention below 4.5 V supply. The datasheet explicitly limits VDR (data retention voltage) to LA versions only.
How many semaphore flags does the IDT71342SA45J8 provide, and how are they accessed?
The IDT71342SA45J8 provides eight independent binary semaphore flags. They are accessed using address lines A0–A2 while asserting SEM = VIL; all other address bits (A3–A11) are ignored during semaphore access. Only I/O0 is used for writing semaphore values (0 = request token, 1 = release), and all I/O pins reflect the flag state during reads.
What package type is used for the IDT71342SA45J8?
The IDT71342SA45J8 uses a 52-pin Plastic Leaded Chip Carrier (PLCC) package, designated PLG52 in IDT documentation. Pin configuration matches the top-view diagram in the datasheet, with specific assignments for dual-port address, data, control, and semaphore signals - distinct from the 64-pin TQFP option used in other variants.
Can both ports of the IDT71342SA45J8 perform simultaneous read/write operations?
Yes - the IDT71342SA45J8 supports fully asynchronous, independent read and write operations on left and right ports simultaneously, provided they target different memory locations. Concurrent access to the same non-semaphore address causes undefined data, but semaphore flag access is protected against contention via dedicated hardware resolution logic.
71342SA45J8 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:
- 45ns
- Access Time:
- 45 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
71342SA45J8 FAQ
1.How can I place an order for 71342SA45J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71342SA45J8 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 71342SA45J8 reliable?
The price and inventory of 71342SA45J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71342SA45J8 is usually 5 days.
3.What payment methods are accepted for 71342SA45J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71342SA45J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71342SA45J8?
71342SA45J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71342SA45J8 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 71342SA45J8?
For technical support, including 71342SA45J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71342SA45J8 requirements.
6.How does Aetrix verify that 71342SA45J8 is sourced from the original manufacturer or authorized distributors?
All 71342SA45J8 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 71342SA45J8 meets industry standards.
7.What is the process for return or replacement of 71342SA45J8?
All 71342SA45J8 units undergo pre-shipment inspection (PSI). If there is an issue with 71342SA45J8, 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 71342SA45J8 part is unused and in its original packaging.
Return procedure for 71342SA45J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71342SA45J8 Tags
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