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Renesas 71342LA45JI8
- Part No.:
- 71342LA45JI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71342LA45JI8.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,249
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Product details
Overview
IDT71342LA45JI8 from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with integrated hardware 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 IDT71342LA45JI8 datasheet, IDT71342LA45JI8 pinout, IDT71342LA45JI8 application, or IDT71342LA45JI8 equivalent, this device is selected for deterministic dual-processor memory sharing where low-latency semaphore handshaking, battery-backed data retention (2 V), and TTL-compatible 5 V operation are required.
Technical Context
The IDT71342LA45JI8 implements two fully independent SRAM ports-left (L) and right (R)-each with dedicated address (A0L–A11L / A0R–A11R), data (I/O0L–I/O7L / I/O0R–I/O7R), and control lines (CEL/CER, OEL/OER, R/WL/R/WR). Its on-chip semaphore block uses eight dedicated latches (addressed via A0–A2 under SEM = VIL) with active-low token semantics and automatic contention resolution.
It features dual power-down modes: TTL-level standby (ISB1 = 80 mA typ.) and CMOS-level full standby (ISB3 = 4.0 mA typ.), plus battery backup data retention at 2 V (ICCDR = 100 µA typ.). All timing parameters-including tAA (45 ns), tWC (45 ns), and tSAA (45 ns)-are specified for industrial-grade operation at VCC = 5.0 V ±10%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 8 bits (4096 words × 8-bit wide), dual-port architecture with separate left/right address/data/control paths |
| Access Time (tAA) | 45 ns max - defines minimum address-to-valid-data delay for SRAM reads under industrial conditions |
| Read Cycle Time (tRC) | 45 ns max - determines maximum sustained read throughput (22.2 MHz) without bus turnaround penalty |
| Data Retention Voltage | 2.0 V min - enables reliable nonvolatile hold mode using external backup battery, unique to LA variant |
| Supply Voltage | 4.5 V to 5.5 V - single TTL-compatible 5 V ±10% rail; no auxiliary supplies required |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Standby Current (ISB3) | 4.0 mA max - ultra-low full-standby power when both CE and SEM inputs exceed VCC – 0.2 V |
Pinout & Package
Package: 64-pin TQFP (PNG64), body size 14 mm × 14 mm × 1.4 mm, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A11L | Left port address inputs | 12-bit address bus for left-side memory access; A10L/A11L used only in 4K mode |
| A0R–A11R | Right port address inputs | 12-bit address bus for right-side memory access; independent of left port timing |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; high-impedance when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; isolated from left port I/O during concurrent access |
| CEL / CER | Left/right chip enable | Active-low enables respective port; deassertion places port in standby (ISB1/ISB2) |
| OEL / OER | Left/right output enable | Active-low controls I/O drivers; allows read-only access while write path remains disabled |
| R/WL / R/WR | Left/right write enable | Active-low initiates write cycle; must overlap with CE and valid address setup |
| SEML / SEMR | Semaphore flag status outputs | Active-low open-drain flags indicating token ownership per side; require external pull-up |
| SEM | Semaphore select | Active-low chip select for semaphore register space (A0–A2 only); disables SRAM access when asserted |
| VCC / GND | Power supply pins | 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 simultaneous, independent read/write access from left and right processors without arbitration delay or bus turnaround overhead |
| On-chip hardware semaphore logic | Eight dedicated binary flags with atomic set/test semantics and guaranteed single-winner resolution during simultaneous requests |
| Battery backup data retention | Preserves stored data at 2 V supply (ICCDR ≤ 1500 µA), enabling seamless failover in power-loss scenarios |
| TTL-compatible 5 V interface | Direct connection to legacy microcontrollers and FPGAs without level-shifting; VIH = 2.2 V min, VIL = 0.8 V max |
| Industrial temperature qualification | Guaranteed functionality across –40°C to +85°C ambient, validated with full AC/DC parameter testing |
Applications
| Real-Time Motor Control | Dual-CPU Communication Bridge |
|---|---|
Use Scenario: Two tightly coupled MCUs coordinate servo positioning-one handles trajectory planning, the other executes PWM updates. IC Role / Device Role / Timing Role: Dual-port RAM serves as shared command buffer and status register; semaphores coordinate write ownership of motion profiles. Use Value: Eliminates polling delays and software locks; 45 ns access ensures sub-microsecond interprocessor synchronization. |
Use Scenario: Host processor offloads protocol parsing to a dedicated communications co-processor, sharing packet buffers and state tables. IC Role / Device Role / Timing Role: Acts as zero-copy message exchange fabric; left port connects to host bus, right port to co-processor bus. Use Value: Enables lock-free data transfer between heterogeneous processors; battery retention preserves pending packets during host reset. |
| Redundant Safety PLC | High-Speed Data Acquisition Buffer |
Use Scenario: Primary and backup safety controllers maintain mirrored I/O states and vote on actuator commands in SIL3-certified systems. IC Role / Device Role / Timing Role: Stores synchronized process images; semaphores enforce exclusive write access during critical state transitions. Use Value: Prevents race conditions during failover; deterministic 45 ns timing satisfies hard real-time watchdog deadlines. |
Use Scenario: FPGA-acquired sensor data streams into one port while DSP processes prior frame from the other port. IC Role / Device Role / Timing Role: Provides ping-pong buffering with no DMA arbitration latency; semaphore signals frame readiness. Use Value: Sustains continuous 22.2 MS/s throughput per port; eliminates FIFO overflow in burst-mode capture. |
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 |
|---|---|---|---|
| CY7C1354V25-45AXI | 4K × 16 organization, 45 ns, 3.3 V core; no battery retention; different pinout (100-pin TQFP) | Requires voltage translation for 5 V systems; lacks 2 V data retention capability | Choose if migrating to 3.3 V design and needing wider data bus; not drop-in compatible |
| IDT71322LA45JI | 2K × 8 configuration, same 45 ns speed, identical package and pinout, but half memory depth | Insufficient for applications requiring ≥4K shared buffer space | Select only when memory footprint is constrained and semaphore logic reuse is prioritized over capacity |
Compared with CY7C1354V25-45AXI and IDT71322LA45JI, the IDT71342LA45JI8 uniquely delivers 4K × 8 capacity, 5 V TTL compatibility, and 2 V battery retention in a 64-pin TQFP-enabling direct replacement in legacy industrial controllers without PCB or firmware changes.
Availability
IDT71342LA45JI8 is available at Aetrix Electronics and suitable for real-time motor control, redundant safety PLCs, dual-CPU communication bridges, and high-speed data acquisition systems requiring stable component supply across extended product lifecycles.
Supply support for IDT71342LA45JI8 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 industrial applications.
IDT71342LA45JI8 belongs to IDT's legacy dual-port SRAM family, designed specifically for deterministic interprocessor communication in safety-critical and real-time embedded systems where hardware semaphore arbitration replaces software-based locking.
FAQ
What is the maximum operating frequency supported by IDT71342LA45JI8?
IDT71342LA45JI8 does not operate at a fixed clock frequency but supports asynchronous access with a 45 ns read cycle time (tRC), enabling up to 22.2 million read operations per second per port. Its performance is governed by timing parameters-not a system clock-making it suitable for event-driven, non-synchronous processor interfaces.
Does IDT71342LA45JI8 support true simultaneous read/write between ports?
Yes, IDT71342LA45JI8 allows true concurrent read and write operations across left and right ports-as long as accesses target different memory locations. The device guarantees full independence: activity on one port imposes zero timing penalty on the other, provided semaphore arbitration prevents conflicting writes to shared addresses.
How does the semaphore logic in IDT71342LA45JI8 prevent race conditions?
IDT71342LA45JI8 implements dedicated hardware semaphore latches with atomic "set-and-test" behavior. When both ports attempt to claim the same flag simultaneously, internal logic guarantees exactly one port succeeds-no software arbitration or retry loops are needed. This eliminates race conditions at the silicon level.
Can IDT71342LA45JI8 retain data during main power loss?
Yes, IDT71342LA45JI8 supports battery backup data retention at 2.0 V minimum supply (VDR), drawing ≤1500 µA typical (ICCDR). This allows persistent storage of critical state variables during main power interruption, provided an external 2 V backup source is connected to VCC.
Is IDT71342LA45JI8 pin-compatible with other members of the IDT71342 family?
IDT71342LA45JI8 uses the 64-pin TQFP (PNG64) package and shares identical pinout with all IDT71342X45 variants in that package-including IDT71342SA45JI8. Differences are limited to internal power optimization (LA vs. SA) and temperature grade; no PCB redesign is needed when substituting within the X45 speed grade.
71342LA45JI8 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
71342LA45JI8 FAQ
1.How can I place an order for 71342LA45JI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71342LA45JI8 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 71342LA45JI8 reliable?
The price and inventory of 71342LA45JI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71342LA45JI8 is usually 5 days.
3.What payment methods are accepted for 71342LA45JI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71342LA45JI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71342LA45JI8?
71342LA45JI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71342LA45JI8 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 71342LA45JI8?
For technical support, including 71342LA45JI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71342LA45JI8 requirements.
6.How does Aetrix verify that 71342LA45JI8 is sourced from the original manufacturer or authorized distributors?
All 71342LA45JI8 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 71342LA45JI8 meets industry standards.
7.What is the process for return or replacement of 71342LA45JI8?
All 71342LA45JI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71342LA45JI8, 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 71342LA45JI8 part is unused and in its original packaging.
Return procedure for 71342LA45JI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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