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Renesas 71342LA55PFI8
- Part No.:
- 71342LA55PFI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71342LA55PFI8.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,965
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Product details
Overview
IDT71342LA55PFI8 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 cycle time, supporting independent asynchronous access from left and right ports, and featuring battery-backed data retention down to 2 V. It is used in real-time interprocessor communication systems requiring concurrent memory access without software arbitration.
For engineers reviewing the IDT71342LA55PFI8 datasheet, IDT71342LA55PFI8 pinout, IDT71342LA55PFI8 application, or IDT71342LA55PFI8 equivalent, this device delivers deterministic port-to-port timing, hardware-managed semaphore contention resolution, low-power standby (1 mW typ.), TTL-compatible 5 V operation, and industrial temperature support (–40°C to +85°C).
Technical Context
The IDT71342LA55PFI8 implements two fully independent asynchronous SRAM ports sharing a single 4K × 8 memory array and an isolated 3-bit addressable (A0–A2) semaphore block of eight binary flags. Each port has dedicated CE, OE, R/W, and address lines, enabling simultaneous read/write operations unless targeting the same non-semaphore memory location.
Semaphore access is decoupled from main memory: SEM = VIL selects the semaphore space while CE = VIH enables it; only I/O0 is used for writing, and all I/O pins reflect the flag state on read. The automatic power-down mode activates when both CE and SEM are HIGH, reducing current to 1 mW (typ.) in full standby (ISB3).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 8 bits (4096 words × 8 data lines), dual-port architecture with separate left/right address/data/control paths |
| Max Read Cycle Time | 55 ns - defines minimum time between successive reads on same port; supports 18.2 MHz sustained access rate |
| Data Retention Voltage | 2.0 V - enables battery backup operation with guaranteed data hold during main power loss |
| Standby Current (ISB3) | 1 mW typical (≈200 µA at 5 V) - ultra-low power mode activated when both CE and SEM are HIGH and inputs held at CMOS levels |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| I/O Compatibility | TTL-level - interfaces directly with 5 V logic families without level-shifting circuitry |
| Semaphore Count | 8 independent binary flags - each accessible via A0–A2, controlled by SEM/R/W/OE, with automatic mutual exclusion |
Pinout & Package
Package: 64-pin TQFP (PNG64), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A11L | Left port address inputs | 12-bit address bus for left-side memory/semaphore access; A0–A2 used exclusively for semaphore addressing |
| A0R–A11R | Right port address inputs | 12-bit address bus for right-side memory/semaphore access; no functional overlap with left port addresses |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; I/O0L used for semaphore write; all bits reflect flag state on semaphore read |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; I/O0R used for semaphore write; all bits reflect flag state on semaphore read |
| CEL / CER | Left/right chip enable | Active-low enables respective port; both HIGH places port in standby; controls power-down entry/exit |
| OEL / OER | Left/right output enable | Active-low enables data output drivers; used with CE to manage bus contention and Z-state control |
| R/WL / R/WR | Left/right write enable | Active-low initiates write cycles; must be coordinated with CE/SEM to target memory vs. semaphore space |
| SEML / SEMR | Left/right semaphore enable | Active-low selects semaphore address space; SEM = VIL + CE = VIH enables semaphore access |
| 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 |
|---|---|
| Hardware semaphore arbitration | Eight dedicated latches with automatic contention resolution ensure deterministic token assignment-no software polling or wait states required |
| Battery-backed data retention | Operates down to 2 V with ≤1500 µA retention current (LA version only), enabling seamless backup during main power failure |
| Independent dual-port timing | No performance penalty on one port due to activity on the other-critical for real-time dual-CPU systems |
| Low-power standby modes | Four defined standby states (ISB1–ISB4); ISB3 achieves 1 mW typical consumption with CMOS-level input hold |
| Full TTL compatibility | Direct interface with legacy 5 V microcontrollers, FPGAs, and ASICs-no level shifters or external biasing needed |
Applications
| Real-Time Dual-Processor Communication | Industrial PLC Shared Memory Buffer |
|---|---|
Use Scenario: Two independent CPUs share sensor data and control commands via a common memory region while avoiding race conditions. IC Role / Device Role / Timing Role: IDT71342LA55PFI8 serves as the shared memory hub with hardware semaphore coordination, eliminating software locks and ensuring sub-55 ns inter-processor handshaking. Use Value: Enables deterministic, zero-wait-state resource allocation-critical for motion control loops running at >10 kHz update rates. |
Use Scenario: A programmable logic controller uses one CPU for I/O scanning and another for logic execution, sharing status registers and command buffers. IC Role / Device Role / Timing Role: IDT71342LA55PFI8 provides isolated, concurrent read/write access to shared variables with atomic semaphore flag updates. Use Value: Guarantees data coherency across CPU domains without interrupt latency penalties or polling overhead. |
| Telecom Line Card Packet Buffer | Avionics Health Monitoring System |
Use Scenario: A line card processes incoming packets on one processor and forwards them to a network stack on another, using shared FIFO buffers. IC Role / Device Role / Timing Role: IDT71342LA55PFI8 acts as the packet descriptor buffer with semaphore-controlled head/tail pointer management. Use Value: Supports 100+ Mbps packet throughput with consistent 55 ns pointer update latency-no pipeline stalls from memory arbitration. |
Use Scenario: Redundant flight computers exchange health telemetry and fault logs in real time under DO-254 constraints. IC Role / Device Role / Timing Role: IDT71342LA55PFI8 stores cross-checked sensor readings and diagnostic flags, with semaphores enforcing strict write-ordering between channels. Use Value: Meets RTCA/DO-254 deterministic timing requirements for safety-critical data exchange with <100 ns worst-case flag acquisition delay. |
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-55AXC | 55 ns access, 4K × 8, but uses separate semaphore register space (not memory-mapped); no battery retention | Lacks 2 V data retention; requires external backup circuitry for power-loss protection | Choose when system already includes backup power management and semaphore register abstraction is preferred |
| AS7C34098B-55PCN | 55 ns, 4K × 8, no integrated semaphore logic; requires external arbitration logic or software protocol | Requires FPGA or MCU firmware to implement token-passing-adds latency and complexity | Choose when cost sensitivity outweighs determinism needs and design can absorb software arbitration overhead |
Compared with CY7C024AV-55AXC and AS7C34098B-55PCN, the IDT71342LA55PFI8 uniquely combines battery-backed data retention, memory-mapped semaphores, and industrial temperature rating in a single 64-pin TQFP package-reducing BOM count and guaranteeing sub-100 ns contention resolution without external components.
Availability
IDT71342LA55PFI8 is available at Aetrix Electronics and suitable for real-time dual-processor communication, industrial PLC shared memory buffering, and avionics health monitoring systems requiring stable component supply across extended production lifecycles.
Supply support for IDT71342LA55PFI8 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 IDT71342LA55PFI8 belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic interprocessor communication in industrial, telecom, and aerospace systems where hardware semaphore arbitration eliminates software-induced latency.
FAQ
What is the maximum operating frequency supported by the IDT71342LA55PFI8?
The IDT71342LA55PFI8 has a maximum read cycle time of 55 ns, corresponding to a theoretical maximum sustained access rate of approximately 18.2 MHz. This value reflects the minimum interval between successive read operations on the same port under worst-case industrial temperature and voltage conditions. The device does not include an internal clock generator-the timing is fully asynchronous and governed by external control signal edges.
Does the IDT71342LA55PFI8 support true simultaneous read/write between ports?
Yes, the IDT71342LA55PFI8 supports fully independent asynchronous operation: the left port can read while the right port writes (or vice versa) to different memory locations. However, simultaneous access to the same non-semaphore address causes undefined data-semaphore locations are protected against such conflicts by dedicated hardware logic that guarantees exclusive write access per flag.
How does the semaphore logic in the IDT71342LA55PFI8 resolve simultaneous requests?
When both ports attempt to write '0' to the same semaphore flag simultaneously, the IDT71342LA55PFI8's on-chip logic guarantees that exactly one port receives the token. If timing skew exists, the earlier request wins; if perfectly aligned, assignment is deterministic but arbitrary-never resulting in deadlock or indeterminate state. This behavior is verified in Truth Table II and timing diagrams DRW12/DRW13.
Can the IDT71342LA55PFI8 retain data during complete power loss?
Yes-the IDT71342LA55PFI8 (LA variant) supports data retention at VCC = 2.0 V with typical current draw of 100 µA and maximum of 1500 µA. This allows connection to a backup battery or supercapacitor to preserve memory contents during main power interruption, as specified in Table 7 (Data Retention Characteristics) and Figure 4 (Data Retention Mode waveform).
What package type is used for the IDT71342LA55PFI8, and are there pin-compatible alternatives?
The IDT71342LA55PFI8 is supplied in a 64-pin TQFP (PNG64) package with 0.5 mm pitch. While IDT also offered a 52-pin PLCC variant (PLG52) for the 71342 family, the PFI8 suffix confirms the TQFP configuration. No pin-compatible drop-in replacements exist-alternative dual-port SRAMs like CY7C024AV-55AXC use different pinouts and control signal assignments, requiring PCB redesign.
71342LA55PFI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- 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:
- 64-TQFP (14x14)
71342LA55PFI8 FAQ
1.How can I place an order for 71342LA55PFI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71342LA55PFI8 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 71342LA55PFI8 reliable?
The price and inventory of 71342LA55PFI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71342LA55PFI8 is usually 5 days.
3.What payment methods are accepted for 71342LA55PFI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71342LA55PFI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71342LA55PFI8?
71342LA55PFI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71342LA55PFI8 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 71342LA55PFI8?
For technical support, including 71342LA55PFI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71342LA55PFI8 requirements.
6.How does Aetrix verify that 71342LA55PFI8 is sourced from the original manufacturer or authorized distributors?
All 71342LA55PFI8 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 71342LA55PFI8 meets industry standards.
7.What is the process for return or replacement of 71342LA55PFI8?
All 71342LA55PFI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71342LA55PFI8, 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 71342LA55PFI8 part is unused and in its original packaging.
Return procedure for 71342LA55PFI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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