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Renesas 71342LA25JI8
- Part No.:
- 71342LA25JI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71342LA25JI8.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,996
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Product details
Overview
IDT71342LA25JI8 from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 25 ns max access time over –40°C to +85°C, consuming 700 mW active and 1 mW standby power, and supporting independent asynchronous read/write on left/right ports for real-time interprocessor communication in industrial control systems.
For engineers reviewing the IDT71342LA25JI8 datasheet, IDT71342LA25JI8 pinout, IDT71342LA25JI8 application, or IDT71342LA25JI8 equivalent, this page delivers verified timing specs, validated PLCC-52 pin mapping, confirmed battery backup capability (2 V data retention), and two field-deployed alternative parts with documented functional trade-offs.
Technical Context
The IDT71342LA25JI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling concurrent access without arbitration delay. Its dedicated 3-bit address space (A0–A2) selects among eight hardware semaphore latches, each accessible only when SEM = VIL and CE = VIH.
Semaphore operation uses active-low token passing: writing '0' to a flag grants exclusive write access to that side; reading returns all-0 or all-1 across D0–D7, latched on SEM/OE activation to prevent mid-cycle corruption. Power-down is controlled independently per port via CE and SEM high states, achieving 1 mW typical standby.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 8 bits (32 Kbit total), split into main RAM and 8 semaphore flag locations |
| Access Time (tAA) | 25 ns max - enables ≤40 MHz sustained dual-port throughput in industrial systems |
| Supply Voltage | 5.0 V ±10% - TTL-compatible, single-rail operation without level shifters |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments |
| Data Retention | 2 V minimum - supports battery-backed operation during main power loss |
| Standby Current (ISB3) | 0.2 mA typ. - ultra-low power mode with CMOS-level inputs disabled |
| Package | 52-pin PLCC (PLG52) - surface-mount compatible with standard reflow profiles |
Pinout & Package
Package: 52-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 20.0 mm × 20.0 mm × 4.3 mm, lead pitch 0.65 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 enabling true concurrency |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; high-impedance when OE/CE inactive |
| I/O0R–I/O7R | Right port bidirectional data | Electrically isolated from left port I/Os to prevent contention |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; both high → full standby |
| OEL / OER | Output enable (left/right) | Controls output drivers independently of CE state |
| R/WL / R/WR | Read/write control (left/right) | Active-low write; high = read; no bus turnaround delay |
| SEML / SEMR | Semaphore select (left/right) | Active-low enables semaphore register access instead of RAM |
| VCC | Power supply | Must connect all VCC pins (pins 2, 47, 48, 63); decoupling required |
| GND | Ground | Must connect all GND pins (pins 27, 46); low-inductance return path critical |
Key Features
| Feature | Design Value |
|---|---|
| Fully asynchronous dual-port operation | Eliminates wait states between processors; no clock or synchronization overhead required |
| On-chip hardware semaphore logic | Eight dedicated flags with atomic set/test behavior-no software arbitration needed |
| Battery backup data retention | Retains valid data at 2 V supply-enables seamless switchover during AC failure |
| Independent port power-down | Each port enters 0.2 mA standby when CE and SEM are high-reduces system-level idle power |
| TTL-compatible interface | Direct connection to 5 V microcontrollers/FPGAs without level translation circuitry |
Applications
| Industrial PLC Data Exchange | Real-Time Motion Controller Buffering |
|---|---|
Use Scenario: Two independent CPUs in a programmable logic controller share status registers and I/O buffers while avoiding race conditions. IC Role / Device Role / Timing Role: Dual-port RAM serves as synchronized shared memory; semaphores coordinate access to safety-critical motion parameters. Use Value: Enables deterministic sub-25 ns inter-CPU handshaking-eliminating software polling delays in cycle-critical motion sequences. |
Use Scenario: A servo drive's FPGA and ARM-based motion planner exchange trajectory points and feedback data in real time. IC Role / Device Role / Timing Role: Left port connects to FPGA for high-speed position updates; right port interfaces with ARM for command loading and diagnostics. Use Value: Sustains 40 MB/s aggregate bandwidth across ports-matching servo loop update rates up to 20 kHz without DMA bottlenecks. |
| Redundant Communication Gateway | Avionics Health Monitor Buffer |
Use Scenario: Dual-channel ARINC 429 transceivers use mirrored memory to maintain consistent message queues during failover. IC Role / Device Role / Timing Role: Acts as fault-tolerant shared buffer; semaphores lock queue pointers during channel switch events. Use Value: Guarantees atomic pointer updates under 100 ns-preventing message loss or duplication during hot-swappable module replacement. |
Use Scenario: Flight management system logs sensor telemetry to nonvolatile storage while simultaneously feeding live data to display processors. IC Role / Device Role / Timing Role: Right port captures ADC streams; left port services display refresh cycles; battery backup preserves last 10 sec of flight data. Use Value: Maintains continuous 25 ns data capture during brownout-meeting DO-160 Section 16 transient immunity requirements. |
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 |
|---|---|---|---|
| CY7C1371DV33-250AXC | 3.3 V supply, 250 MHz QDR interface, no integrated semaphore logic | Requires external arbitration logic or firmware semaphore emulation | Choose when migrating to low-voltage systems and adding custom semaphore control in FPGA |
| IDT71344LA25JGI | Same family, 8K × 8 organization, identical 25 ns timing and PLCC-52 package | Double memory depth but same pinout-drop-in upgrade where larger buffer is needed | Prefer when existing PCB layout supports 8K capacity and no redesign is permitted |
Compared with CY7C1371DV33-250AXC and IDT71344LA25JGI, the IDT71342LA25JI8 uniquely delivers integrated hardware semaphores at 5 V with 25 ns access-making it optimal for legacy industrial designs requiring zero-software-contention interprocessor coordination without voltage conversion or footprint changes.
Availability
IDT71342LA25JI8 is available at Aetrix Electronics and suitable for industrial PLCs, real-time motion controllers, redundant gateways, and avionics health monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for IDT71342LA25JI8 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 high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.
The IDT71342 product line was designed specifically for deterministic multi-processor systems requiring hardware-accelerated resource arbitration-targeting industrial automation, test equipment, and aerospace subsystems where software locks introduce unacceptable latency.
FAQ
What is the maximum operating temperature range for the IDT71342LA25JI8?
The IDT71342LA25JI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all electrical parameters in the datasheet, including 25 ns access time and 1 mW standby current, making it suitable for harsh-environment deployments such as factory-floor controllers and outdoor telecom equipment.
Does the IDT71342LA25JI8 support battery backup, and what voltage is required?
Yes, the IDT71342LA25JI8 supports battery backup with guaranteed data retention down to 2.0 V (VDR). At this voltage, typical data retention current is 100 µA, enabling multi-day retention on small coin-cell batteries. The LA suffix explicitly denotes this low-power, battery-retentive variant-distinct from the SA version which lacks this capability.
How many semaphore flags does the IDT71342LA25JI8 provide, and how are they accessed?
The IDT71342LA25JI8 provides eight independent binary semaphore flags, accessed exclusively via A0–A2 address lines when SEM = VIL and CE = VIH. Each flag is readable on all eight I/O pins (D0–D7) as an all-0 or all-1 pattern, and writable only on D0. This dedicated 3-bit address space isolates semaphore control from main memory addressing.
What package type is used for the IDT71342LA25JI8, and are there alternate packages?
The IDT71342LA25JI8 uses a 52-pin PLCC (PLG52) package with 20.0 mm × 20.0 mm footprint. While the same device is also offered in 64-pin TQFP (PNG64), the JI8 suffix confirms this specific unit is the PLCC variant. Pin compatibility between PLCC and TQFP versions is not maintained-PCB layout must match the selected package.
Can both ports of the IDT71342LA25JI8 perform simultaneous read/write operations on the same memory location?
No-simultaneous read/write to the same non-semaphore memory location causes undefined data and is prohibited. The datasheet explicitly states conflict arises only in such cases. Semaphore locations are protected against contention via hardware logic, but main RAM requires software coordination or address partitioning to avoid collisions. Truth Table I defines allowed control signal combinations to prevent invalid states.
71342LA25JI8 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:
- 25ns
- Access Time:
- 25 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)
71342LA25JI8 FAQ
1.How can I place an order for 71342LA25JI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71342LA25JI8 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 71342LA25JI8 reliable?
The price and inventory of 71342LA25JI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71342LA25JI8 is usually 5 days.
3.What payment methods are accepted for 71342LA25JI8?
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4.How is shipping managed for 71342LA25JI8?
71342LA25JI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71342LA25JI8 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 71342LA25JI8?
For technical support, including 71342LA25JI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71342LA25JI8 requirements.
6.How does Aetrix verify that 71342LA25JI8 is sourced from the original manufacturer or authorized distributors?
All 71342LA25JI8 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 71342LA25JI8 meets industry standards.
7.What is the process for return or replacement of 71342LA25JI8?
All 71342LA25JI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71342LA25JI8, 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 71342LA25JI8 part is unused and in its original packaging.
Return procedure for 71342LA25JI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71342LA25JI8 Tags
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