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Renesas 71342SA55JI8
- Part No.:
- 71342SA55JI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71342SA55JI8.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,224
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Product details
Overview
IDT71342SA55JI8 from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 55 ns max read/write 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 deterministic resource arbitration.
For engineers reviewing the IDT71342SA55JI8 datasheet, IDT71342SA55JI8 pinout, IDT71342SA55JI8 application, or IDT71342SA55JI8 equivalent, this page delivers verified timing specs (tRC = 55 ns), power behavior (ISB3 = 1.0 mA typ.), semiconductor-grade industrial temperature support (–40°C to +85°C), and exact PLCC-52 package mapping per official IDT documentation.
Technical Context
The IDT71342SA55JI8 implements fully asynchronous dual-port SRAM architecture with physically separate address/data/control paths for left (L) and right (R) ports, enabling concurrent read/write operations without bus contention. Its dedicated 3-bit semaphore address space (A0–A2) and SEM pin-controlled access isolate flag management from main memory space.
Semaphore logic uses dual request latches per flag with priority resolution on simultaneous write attempts, ensuring exactly one port acquires the token - no software arbitration delay or wait states required. Power-down modes are controlled independently per port via CE and SEM pins, with CMOS-level standby (ISB3) drawing only 1.0 mA typical at VCC = 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 8 bits (4096 words × 8 data lines) - supports byte-wide data exchange between two processors |
| Read Cycle Time (tRC) | 55 ns maximum - defines minimum interval between successive reads on same 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 embedded control and communications equipment |
| Standby Current (ISB3) | 1.0 mA typical - achieved when both ports' CE and SEM inputs exceed VCC − 0.2 V |
| Semaphore Access | Enabled by SEM = VIL, using A0–A2 only - eight independent binary flags for resource locking |
| Package | 52-pin PLCC (PLG52) - surface-mount, leaded ceramic package with 0.79″ × 0.79″ footprint |
Pinout & Package
Package: 52-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 20.0 mm × 20.0 mm × 4.3 mm, with standard PLCC pin numbering (pin 1 at corner notch).
| 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 data path; direction controlled by R/WL and OEL |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; direction controlled by R/WR and OER |
| CEL / CER | Left/right chip enable | Active-low enables respective port; controls power-down entry/exit |
| OEL / OER | Left/right output enable | Active-low enables I/O drivers; high-Z when disabled |
| R/WL / R/WR | Left/right write enable | Active-low initiates write; high = read mode |
| SEML / SEMR | Left/right semaphore flag | Active-low indicates token ownership status per port |
| SEM | Semaphore select | Low enables semaphore address space (A0–A2); high enables main RAM |
| VCC | Power supply | Single 5V ±10% supply; all VCC pins must be connected |
| GND | Ground | All GND pins must be connected to system ground plane |
| N/C | No connect | Pins 1, 7, 46, 47, 49, 50, 51, 52 - electrically isolated, no internal connection |
Key Features
| Feature | Design Value |
|---|---|
| Hardware semaphore arbitration | Eight dedicated binary flags with automatic conflict resolution - eliminates software polling loops and guarantees atomic token acquisition |
| Full port independence | Simultaneous read/write on left and right ports with zero cycle penalty - no shared timing constraints between sides |
| Multi-level power management | Four standby modes (ISB1–ISB4) down to 1.0 mA typical - enables dynamic power gating per active port |
| TTL-compatible interface | VIH = 2.2 V min, VIL = 0.8 V max - interoperable with 5V microcontrollers, FPGAs, and ASICs without translators |
| Dual-mode memory access | Main RAM (4K×8) and semaphore space (8×1) share same I/O pins but use separate address decoding - no external logic needed |
Applications
| Industrial PLC Communication Hub | Avionics Dual-Processor Data Exchange |
|---|---|
Use Scenario: Two independent PLC CPUs share I/O configuration tables and real-time sensor buffers via shared memory. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency inter-CPU mailbox with hardware semaphore preventing simultaneous writes to critical registers. Use Value: Eliminates 10–15 µs software arbitration delays per access; tRC = 55 ns ensures sub-microsecond data handoff between control and monitoring cores. |
Use Scenario: Flight control computer and navigation processor exchange attitude quaternion updates and fault logs in safety-critical avionics. IC Role / Device Role / Timing Role: IDT71342SA55JI8 provides deterministic, lock-free memory sharing with guaranteed semaphore resolution under EMI stress. Use Value: ISB3 = 1.0 mA standby current extends battery-backed operation during main power loss; –40°C to +85°C rating meets DO-160 environmental requirements. |
| Medical Imaging Real-Time Buffering | Test Equipment Pattern Generator Sync |
Use Scenario: MRI subsystem uses one processor for raw ADC data capture and another for image reconstruction - both require low-jitter access to frame buffers. IC Role / Device Role / Timing Role: IDT71342SA55JI8 serves as dual-access frame store with independent timing domains; semaphores coordinate buffer full/empty signaling. Use Value: 55 ns tRC enables >18 MHz sustained throughput per port; no wait states preserve deterministic latency for FDA-certified real-time processing. |
Use Scenario: Automated test equipment synchronizes pattern generator and measurement unit clocks using shared trigger tables updated at 100 kHz. IC Role / Device Role / Timing Role: Dual-port RAM stores timestamped event records; semaphores prevent race conditions during table rollover. Use Value: PLCC-52 package allows direct replacement of legacy 71342 variants on existing test head PCBs; pinout identical to IDT71342LA55JI8. |
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 |
|---|---|---|---|
| Cypress CY7C1355BV33 | 3.3V core, 64-pin TQFP only, tRC = 55 ns, no native semaphore logic - requires external logic or firmware arbitration | Requires redesign for 3.3V I/O and external semaphore implementation; unsuitable for drop-in 5V TTL systems | Select only if migrating to 3.3V architecture and adding FPGA-based semaphore controller |
| IDT71342LA55JI8 | Same speed grade (55 ns), identical PLCC-52 pinout, but LA variant adds 2V data retention (100 µA ICCDR) - higher standby current in ISB1/ISB2 modes | Direct physical replacement; differs only in battery backup capability and slightly higher active power | Choose IDT71342LA55JI8 only when 2V data retention during main power loss is required |
Compared with CY7C1355BV33 and IDT71342LA55JI8, the IDT71342SA55JI8 uniquely delivers 5V TTL compatibility, integrated hardware semaphore logic, and lowest ISB3 current (1.0 mA) - making it optimal for industrial control and avionics where voltage stability and deterministic arbitration are non-negotiable.
Availability
IDT71342SA55JI8 is available at Aetrix Electronics and suitable for industrial PLC communication hubs, avionics dual-processor data exchange, and medical imaging real-time buffering requiring stable component supply across extended production lifecycles.
Supply support for IDT71342SA55JI8 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.
IDT71342SA55JI8 belongs to IDT's dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems where hardware semaphore arbitration replaces software-intensive locking.
FAQ
What is the maximum operating temperature range for IDT71342SA55JI8?
IDT71342SA55JI8 is rated for industrial temperature operation from –40°C to +85°C, validated per IDT specification DSC2621/16. This range applies to all AC and DC electrical parameters including tRC = 55 ns max, ISB3 = 1.0 mA typical, and VIH/VIL thresholds - no derating required within this envelope.
Does IDT71342SA55JI8 support battery backup operation?
No. IDT71342SA55JI8 does not support battery backup or 2V data retention. That feature is exclusive to the LA variant (e.g., IDT71342LA55JI8). The SA suffix denotes standard power operation only, with data retention guaranteed only at VCC ≥ 4.5 V.
How many semaphore flags does IDT71342SA55JI8 provide, and how are they accessed?
IDT71342SA55JI8 provides eight independent binary semaphore flags, accessed exclusively via A0–A2 address lines when SEM = VIL. Only I/O0 is used for writing; all eight I/O lines reflect the flag state (0x00 or 0xFF) on read. Each flag operates as a hardware token with automatic conflict resolution.
Is IDT71342SA55JI8 pin-compatible with other members of the IDT71342 family?
Yes - IDT71342SA55JI8 shares identical PLCC-52 pinout with all IDT71342X55 variants (e.g., IDT71342LA55JI8), including matching signal names, positions, and power/ground pin assignments. No PCB layout changes are needed when substituting within the 55 ns speed grade.
What is the minimum pulse width required for reliable write operations on IDT71342SA55JI8?
The minimum write pulse width (tWP) for IDT71342SA55JI8 is 50 ns, specified in Table 10b of the datasheet. This value ensures proper setup and hold timing for data valid window (tDW = 25 ns) and write recovery (tWR = 0 ns), and must be maintained across the full –40°C to +85°C temperature range.
71342SA55JI8 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:
- 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:
- 52-PLCC (19.13x19.13)
71342SA55JI8 FAQ
1.How can I place an order for 71342SA55JI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71342SA55JI8 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 71342SA55JI8 reliable?
The price and inventory of 71342SA55JI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71342SA55JI8 is usually 5 days.
3.What payment methods are accepted for 71342SA55JI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71342SA55JI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71342SA55JI8?
71342SA55JI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71342SA55JI8 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 71342SA55JI8?
For technical support, including 71342SA55JI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71342SA55JI8 requirements.
6.How does Aetrix verify that 71342SA55JI8 is sourced from the original manufacturer or authorized distributors?
All 71342SA55JI8 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 71342SA55JI8 meets industry standards.
7.What is the process for return or replacement of 71342SA55JI8?
All 71342SA55JI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71342SA55JI8, 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 71342SA55JI8 part is unused and in its original packaging.
Return procedure for 71342SA55JI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71342SA55JI8 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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M24C02-FMC6TG
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