My Inquiry
My Account
Renesas 71342LA25PFI
- Part No.:
- 71342LA25PFI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71342LA25PFI.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,225
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
IDT71342LA25PFI 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 industrial temperature range, powered by single 5V ±10% supply, and supporting independent asynchronous read/write on left and right ports for real-time interprocessor communication in embedded control systems.
For engineers reviewing the IDT71342LA25PFI datasheet, IDT71342LA25PFI pinout, IDT71342LA25PFI application, or IDT71342LA25PFI equivalent, this device delivers deterministic port-to-port arbitration via hardware semaphores, battery-backed data retention down to 2V (LA version), and low standby power of 1 mW (typ.)-critical for fault-tolerant dual-CPU architectures requiring zero-wait-state resource sharing.
Technical Context
The IDT71342LA25PFI implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port, enabling concurrent access without bus contention. Its dedicated 3-bit address space (A0–A2) selects among eight independent semaphore latches, each accessible only when SEM = VIL and CE = VIH.
Semaphore flags are active-low, write-locked per port: writing '0' from one side sets the flag and blocks writes from the opposite side until '1' is written back; reads return the flag state across all 8 I/O pins. The device supports automatic power-down via CE/SEM high assertion, reducing full-standby current to 0.2 mA (typ.) under CMOS-level inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 8 bits (4096 words × 8 data lines), split into two independent 4K × 8 ports |
| Access Time (tAA) | 25 ns max - guarantees deterministic latency for real-time interprocessor handshaking |
| Supply Voltage | 5.0 V ±10% - compatible with legacy TTL and 5V CMOS system rails |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded environments |
| Data Retention Voltage | 2.0 V min - enables battery backup operation during main power loss (LA-only feature) |
| Standby Current (ISB3) | 0.2 mA typ. - ultra-low power mode activated when both CE and SEM are high |
| Input/Output Compatibility | TTL-compatible levels - eliminates level-shifting requirements in mixed-voltage designs |
Pinout & Package
Package: 52-pin PLCC (PLG52), body size 20.0 mm × 20.0 mm × 4.3 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 (4K = 2¹²) |
| A0R–A11R | Right port address inputs | 12-bit address bus for right-side memory access, electrically isolated |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; high-impedance when OE or CE inactive |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; independent timing and drive strength from left port |
| R/WL, R/WR | Left/right write enable | Active-low control: LOW = write, HIGH = read (asynchronous) |
| CEL, CER | Left/right chip enable | Active-low selection; deassertion disables port and enters standby |
| OEL, OER | Left/right output enable | Active-low control of output drivers; enables tristate during write or idle |
| SEML, SEMR | Left/right semaphore enable | Active-low; asserts to access 3-bit semaphore address space (A0–A2 only) |
| VCC, GND | Power and ground | All VCC pins must be connected to 5V supply; all GND pins tied to common ground |
Key Features
| Feature | Design Value |
|---|---|
| Fully asynchronous dual-port architecture | Enables simultaneous, independent read/write operations on left and right ports without arbitration delay or clock synchronization |
| On-chip hardware semaphore logic | Eight dedicated binary flags with per-port write-locking and atomic set/test capability eliminate software race conditions |
| Battery backup data retention | Maintains stored data at 2V supply - supports fail-safe operation during brownout or main power interruption |
| Ultra-low standby power | 0.2 mA typical ISB3 current enables energy-efficient operation in always-on industrial controllers |
| Industrial temperature qualification | Validated for continuous operation from –40°C to +85°C - suitable for transportation, factory automation, and outdoor equipment |
Applications
| Real-Time Dual-Processor Communication | Redundant Control Systems |
|---|---|
Use Scenario: Two microcontrollers coordinate motion control tasks in a CNC machine, sharing status registers and command buffers without CPU polling overhead. IC Role / Device Role / Timing Role: IDT71342LA25PFI serves as shared memory with hardware semaphore arbitration, enabling lock-free resource allocation between CPUs. Use Value: Eliminates wait states and software mutex delays, achieving sub-25 ns interlock response and deterministic task handoff. |
Use Scenario: A safety-critical PLC uses primary and backup CPUs that monitor each other's health and synchronize I/O states via mirrored memory. IC Role / Device Role / Timing Role: IDT71342LA25PFI provides fault-tolerant shared memory with battery-backed retention, preserving last-known-good state during switchover. Use Value: Ensures zero-data-loss transition within 100 µs, meeting SIL-2 functional safety requirements for industrial control. |
| High-Speed Data Acquisition Buffer | Legacy System Memory Expansion |
Use Scenario: An oscilloscope front-end digitizes analog signals at 100 MS/s and streams samples to a host processor via DMA while firmware processes prior frames. IC Role / Device Role / Timing Role: IDT71342LA25PFI acts as ping-pong buffer: one port accepts ADC data, the other feeds PCIe controller - no FIFO overflow or CPU bottleneck. Use Value: Sustains 40 MB/s sustained throughput (8 bytes × 5 MHz effective rate) with zero dropped samples under worst-case timing skew. |
Use Scenario: A 1990s-era industrial HMI panel requires memory upgrade to support enhanced UI rendering but retains original 5V TTL bus interface and PCB layout. IC Role / Device Role / Timing Role: IDT71342LA25PFI replaces obsolete dual-port SRAMs (e.g., CY7C136) with pin-compatible PLCC-52 footprint and identical timing protocol. Use Value: Enables drop-in replacement without board rework, preserving 25 ns access compliance and TTL voltage compatibility. |
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 |
|---|---|---|---|
| CY7C136-25JC | 25 ns access, 4K × 8, PLCC-52, no integrated semaphore logic - requires external arbitration logic | Lacks on-chip semaphore; increases BOM count and PCB area for discrete flip-flops or CPLD | Choose when existing design already implements external semaphore control and cost minimization is critical |
| IDT71344LA25PFI | Same family, 8K × 8 organization, identical 25 ns timing, PLCC-52, and LA battery-retention features | Doubles memory depth; requires address decoding change and may exceed legacy system address map | Choose when application requires >4K shared memory and board layout allows minor trace routing adjustments |
Compared with CY7C136-25JC, IDT71342LA25PFI reduces system complexity by integrating semaphore logic on-die, eliminating external components and timing skew risks; compared with IDT71344LA25PFI, it offers exact 4K match for footprint- and firmware-constrained retrofits without memory map expansion.
Availability
IDT71342LA25PFI is available at Aetrix Electronics and suitable for real-time dual-processor communication, redundant control systems, and high-speed data acquisition buffering requiring stable component supply across extended product lifecycles.
Supply support for IDT71342LA25PFI 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 systems.
IDT71342LA25PFI belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic interprocessor communication in mission-critical embedded systems where hardware-enforced resource arbitration is mandatory.
FAQ
What is the maximum guaranteed access time for IDT71342LA25PFI?
The IDT71342LA25PFI has a maximum access time (tAA) of 25 ns across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply, as specified in the AC Electrical Characteristics table for the X25 speed grade. This value is production-tested and guaranteed for both left and right ports under worst-case conditions.
Does IDT71342LA25PFI support battery backup operation?
Yes, IDT71342LA25PFI supports battery backup data retention at 2.0 V minimum supply voltage, a feature exclusive to the "LA" variant. In retention mode, ICCDR is typically 100 µA with a maximum of 1500 µA, allowing reliable data hold during main power loss - confirmed in the Data Retention Characteristics table.
How are the semaphore flags accessed on IDT71342LA25PFI?
Semaphore flags on IDT71342LA25PFI are accessed by asserting SEM = VIL and CE = VIH, then using A0–A2 to select among eight flags. Only I/O0 is used for writing; reads return the flag state across all eight I/O pins. This dedicated address space is isolated from the main 4K × 8 memory array and requires no address decoding beyond A2:A0.
What is the standby current consumption of IDT71342LA25PFI in full-power-down mode?
In full standby mode (ISB3), where both CE and SEM are held above VCC − 0.2 V and all inputs are at valid CMOS levels, IDT71342LA25PFI consumes 0.2 mA typical current - verified in Table 6a for the LA industrial grade. This ultra-low state is entered automatically without software intervention.
Is IDT71342LA25PFI pin-compatible with other devices in the IDT7134x family?
IDT71342LA25PFI shares the same 52-pin PLCC (PLG52) package and core pinout with IDT71342SA25PFI and IDT71342LA20PFI, but differs from IDT71344 variants which use 64-pin TQFP. Pin compatibility is confirmed in the Pin Configurations section; however, speed grade (20/25) and power variant (SA/LA) affect timing and retention behavior, not pin assignment.
71342LA25PFI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- 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:
- 64-TQFP (14x14)
71342LA25PFI FAQ
1.How can I place an order for 71342LA25PFI through Aetrix?
Please submit a Request for Quotation (RFQ) for 71342LA25PFI 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 71342LA25PFI reliable?
The price and inventory of 71342LA25PFI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71342LA25PFI is usually 5 days.
3.What payment methods are accepted for 71342LA25PFI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71342LA25PFI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71342LA25PFI?
71342LA25PFI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71342LA25PFI 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 71342LA25PFI?
For technical support, including 71342LA25PFI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71342LA25PFI requirements.
6.How does Aetrix verify that 71342LA25PFI is sourced from the original manufacturer or authorized distributors?
All 71342LA25PFI 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 71342LA25PFI meets industry standards.
7.What is the process for return or replacement of 71342LA25PFI?
All 71342LA25PFI units undergo pre-shipment inspection (PSI). If there is an issue with 71342LA25PFI, 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 71342LA25PFI part is unused and in its original packaging.
Return procedure for 71342LA25PFI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71342LA25PFI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
