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Renesas 71342LA20J8
- Part No.:
- 71342LA20J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71342LA20J8.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,227
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Product details
Overview
IDT71342LA20J8 from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at ≤20 ns access time (commercial grade), supporting independent asynchronous read/write on left and right ports, and enabling interprocessor resource arbitration in real-time embedded systems. It features battery-backed data retention down to 2V and consumes only 1 mW typical standby power.
For engineers reviewing the IDT71342LA20J8 datasheet, IDT71342LA20J8 pinout, IDT71342LA20J8 application, or IDT71342LA20J8 equivalent, this page delivers verified technical context, exact pin-level circuit roles, real-world use scenarios in multiprocessor synchronization, and validated alternative parts for SRAM-based shared-memory architectures requiring hardware semaphore support.
Technical Context
The IDT71342LA20J8 integrates two fully independent 4K × 8 SRAM arrays with separate address, data, and control buses (A0L–A11L/I/O0L–I/O7L/R/WL/CEL/OEL vs. A0R–A11R/I/O0R–I/O7R/R/WR/CER/OER), enabling true concurrent access without bus contention. Its dedicated semaphore block contains eight binary flags accessible via SEM pin activation and A0–A2 addressing, with active-low token semantics and automatic contention resolution.
All control signals-including CE, SEM, OE, and R/W-are TTL-compatible and operate from a single 5V ±10% supply. The device implements automatic power-down when both CE and SEM are HIGH, reducing port-level current to ≤1 mW (ISB3) under CMOS-level input conditions, and supports 2V data retention exclusively in LA-grade versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 8 bits per port (8,192 bytes total), split into main RAM and 8 semaphore flag locations |
| Access Time (tAA) | 20 ns max - defines minimum clock-to-data latency for synchronous interface design |
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with legacy 5V TTL logic families and mixed-voltage backplanes |
| Standby Current (ISB3) | 1.0 µA typical - enables ultra-low-power hold mode during processor idle cycles |
| Data Retention Voltage | 2.0 V min - allows battery backup operation using coin-cell sources without regulator |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and communications equipment |
| Package Type | 52-pin PLCC (PLG52) - surface-mount compatible with automated assembly and thermal cycling reliability |
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 mapping; no effect on semaphore access |
| A0R–A11R | Right port address inputs | 12-bit address bus for right-side memory mapping; independent of left port timing |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; tri-stated when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; tri-stated when OER = VIH or CER = VIH |
| R/WL / R/WR | Left/right write enable | Active-low control: LOW = write, HIGH = read; determines data direction per port |
| CEL / CER | Left/right chip enable | Active-low selection: disables port I/O and reduces current draw when HIGH |
| OEL / OER | Left/right output enable | Active-low control: enables data drivers only when paired with active CE |
| SEML / SEMR | Left/right semaphore enable | Active-low signal that switches address space from RAM to 3-bit semaphore register (A0–A2) |
| VCC | Power supply | Single 5V ±10% source; all VCC pins must be decoupled locally |
| GND | Ground reference | Common return for all signals; all GND pins must connect to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Fully asynchronous dual-port operation | Enables simultaneous read/write between processors without clock domain synchronization or arbitration logic |
| On-chip hardware semaphore logic | Eight independent binary flags with atomic set/test capability and guaranteed single-winner resolution on simultaneous requests |
| Battery backup data retention | Maintains stored data at 2V supply-critical for fail-safe state preservation in power-loss scenarios |
| Ultra-low standby power | 1 mW typical (ISB3) with CMOS-level inputs-reduces thermal load and extends battery life in portable systems |
| TTL-compatible 5V interface | Eliminates level-shifting requirements in legacy industrial controllers and test equipment designs |
Applications
| Industrial PLC Memory Coherency | Avionics Dual-Processor Data Exchange |
|---|---|
Use Scenario: Two independent CPUs in a programmable logic controller share configuration tables and I/O status buffers via common memory. IC Role / Device Role / Timing Role: IDT71342LA20J8 serves as synchronized shared memory with hardware-enforced mutual exclusion using semaphore flags. Use Value: Eliminates software polling delays and prevents race conditions during real-time I/O updates, ensuring deterministic response within 20 ns access window. |
Use Scenario: Flight control computer and monitoring unit exchange sensor fusion results and health telemetry over a fault-tolerant memory interface. IC Role / Device Role / Timing Role: IDT71342LA20J8 provides lock-free interprocessor communication with guaranteed token arbitration and 2V data retention during brownout. Use Value: Enables zero-wait-state handshaking between safety-critical subsystems, meeting DO-254 timing constraints without external arbitration logic. |
| Medical Imaging Frame Buffer | Test Equipment Pattern Generator Sync |
Use Scenario: Image acquisition engine writes raw frames while display processor reads rendered previews from the same memory space. IC Role / Device Role / Timing Role: IDT71342LA20J8 acts as dual-access frame buffer with semaphores coordinating frame ownership and readiness signaling. Use Value: Prevents visual artifacts caused by partial frame reads, sustaining 50+ MB/s throughput with sub-25 ns latency per pixel row. |
Use Scenario: Automated test system uses one controller to load stimulus patterns while another verifies response timing against known golden waveforms. IC Role / Device Role / Timing Role: IDT71342LA20J8 functions as synchronized pattern store with semaphore-controlled buffer switching between generation and validation engines. Use Value: Reduces test cycle time by eliminating software handshake overhead, achieving repeatable nanosecond-level trigger alignment across channels. |
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 |
|---|---|---|---|
| CY7C1342KV18-20BAI | 18-bit bus width, 2.5V core + 3.3V I/O, 20 ns access, QFN64 package | Requires level translation in 5V systems; higher density but incompatible voltage and pinout | Select only if migrating to low-voltage architecture and redesigning PCB layout |
| AS7C34098B-20JCIN | No integrated semaphore logic; requires external arbitration logic or software-only protocols | Lacks hardware token passing-increases CPU overhead and risk of deadlock in hard real-time contexts | Choose only for cost-sensitive non-safety applications where software semaphore management is acceptable |
Compared with CY7C1342KV18-20BAI and AS7C34098B-20JCIN, the IDT71342LA20J8 uniquely delivers 5V TTL compatibility, on-die semaphore arbitration, and 2V battery retention in a drop-in PLCC package-making it irreplaceable for legacy industrial upgrades requiring zero firmware changes and guaranteed interprocessor coherency.
Availability
IDT71342LA20J8 is available at Aetrix Electronics and suitable for industrial PLCs, avionics data concentrators, medical imaging subsystems, and automated test equipment requiring stable component supply across extended product lifecycles.
Supply support for IDT71342LA20J8 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.
IDT71342LA20J8 belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems where hardware semaphore arbitration eliminates software-induced latency and deadlock risks.
FAQ
What is the maximum guaranteed access time for IDT71342LA20J8?
IDT71342LA20J8 guarantees a maximum address access time (tAA) of 20 ns under commercial temperature conditions (0°C to +70°C) and VCC = 5.0 V ±10%. This value is production-tested and applies to both left and right ports during standard SRAM read operations with CE and OE asserted.
Does IDT71342LA20J8 support true simultaneous read/write between ports?
Yes, IDT71342LA20J8 supports fully independent asynchronous access: the left port can execute a write while the right port performs a read, or vice versa, provided they target different memory locations. Conflict detection is limited to concurrent writes to identical addresses outside the semaphore region.
How does the semaphore logic in IDT71342LA20J8 resolve simultaneous token requests?
IDT71342LA20J8's semaphore logic guarantees exactly one winner when both ports attempt to write '0' to the same flag simultaneously. If timing skew exists, the earlier request wins; if perfectly aligned, the assignment is deterministic but arbitrary-ensuring no deadlock or metastability.
Can IDT71342LA20J8 retain data during main power loss?
Yes, IDT71342LA20J8 supports battery backup data retention at VCC = 2.0 V minimum. In this mode, current draw drops to ≤1500 µA (typical 100 µA), preserving full 4K × 8 memory contents without refresh-verified per Table 7 in the official datasheet.
Is IDT71342LA20J8 pin-compatible with other members of the IDT71342 family?
IDT71342LA20J8 shares identical 52-pin PLCC pinout with IDT71342SA20J8 and IDT71342LA25J8. Differences are limited to speed grade (20 ns vs. 25 ns) and power profile (LA = low-power/battery-retention, SA = standard power); no PCB redesign is needed when substituting within same package variant.
71342LA20J8 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:
- 20ns
- Access Time:
- 20 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)
71342LA20J8 FAQ
1.How can I place an order for 71342LA20J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71342LA20J8 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 71342LA20J8 reliable?
The price and inventory of 71342LA20J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71342LA20J8 is usually 5 days.
3.What payment methods are accepted for 71342LA20J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71342LA20J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71342LA20J8?
71342LA20J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71342LA20J8 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 71342LA20J8?
For technical support, including 71342LA20J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71342LA20J8 requirements.
6.How does Aetrix verify that 71342LA20J8 is sourced from the original manufacturer or authorized distributors?
All 71342LA20J8 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 71342LA20J8 meets industry standards.
7.What is the process for return or replacement of 71342LA20J8?
All 71342LA20J8 units undergo pre-shipment inspection (PSI). If there is an issue with 71342LA20J8, 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 71342LA20J8 part is unused and in its original packaging.
Return procedure for 71342LA20J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71342LA20J8 Tags
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