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Renesas 71342LA55J
- Part No.:
- 71342LA55J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71342LA55J.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,207
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Product details
Overview
IDT71342LA55J from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 55 ns read/write cycle time, supporting independent asynchronous access from left and right ports, and featuring battery-backed data retention down to 2 V - used in real-time interprocessor communication systems requiring concurrent memory access without software arbitration.
For engineers reviewing the IDT71342LA55J datasheet, IDT71342LA55J pinout, IDT71342LA55J application, or IDT71342LA55J equivalent, this page delivers verified timing parameters (tRC = 55 ns), power specs (ISB3 = 4.0 µA typ.), industrial temperature range (–40°C to +85°C), TTL-compatible 5 V ±10% supply, and full semaphore flag behavior for deterministic resource locking between two CPUs.
Technical Context
The IDT71342LA55J implements fully asynchronous dual-port SRAM architecture with physically separate address, control, and I/O buses for left and right ports - enabling simultaneous read/write operations 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 operation uses active-low token passing: writing '0' to a flag grants exclusive write access to that side; reading returns identical values across all 8 I/O pins; automatic contention resolution ensures deterministic flag assignment even during simultaneous requests. Power management includes four standby modes (ISB1–ISB4), with ISB3 achieving 4.0 µA typical current at CMOS-level inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 8 bits (4096 words × 8 data lines), split into main RAM and 8 semaphore flag locations |
| Read Cycle Time (tRC) | 55 ns max - defines minimum interval between successive reads on same port |
| Supply Voltage | 5.0 V ±10% - TTL-compatible single-supply operation; supports 2.0 V data retention in LA version |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Standby Current (ISB3) | 4.0 µA typical - ultra-low power mode activated when both CE and SEM exceed VCC – 0.2 V |
| Input/Output Compatibility | TTL-level input thresholds (VIH = 2.2 V min, VIL = 0.8 V max); outputs drive 6 mA low / –4 mA high |
| Package Type | 64-pin TQFP (PNG64) - 14 mm × 14 mm body, 1.4 mm height, lead-free compatible |
Pinout & Package
Package: 64-pin Thin Quad Flat Package (TQFP), body size 14 mm × 14 mm × 1.4 mm, RoHS-compliant, surface-mount.
| 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 for right-side access |
| I/O0L–I/O7L | Left Port Data I/O | Bidirectional 8-bit data path; high-impedance when OE or CE inactive |
| I/O0R–I/O7R | Right Port Data I/O | Independent 8-bit bidirectional data path, electrically isolated from left port |
| CEL, CER | Chip Enable (Left/Right) | Active-low enables respective port; controls power-down entry when high |
| OEL, OER | Output Enable (Left/Right) | Active-low enables output drivers; overrides R/W state for read-only access |
| R/WL, R/WR | Read/Write Control (Left/Right) | Active-low = write; high = read; determines direction of I/O data flow per port |
| SEML, SEMR | Semaphore Enable (Left/Right) | Active-low selects semaphore register space instead of main RAM; enables flag access |
| VCC | Power Supply | 5 V ±10% supply; all VCC pins must be connected to decoupled source |
| GND | Ground | Reference return; all GND pins must be connected to low-impedance ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Semaphore Logic | Eight independent binary flags with automatic contention resolution - eliminates need for software polling or wait states in multi-CPU systems |
| Battery Backup Retention | 2 V minimum VCC for data retention (LA version only) - enables nonvolatile operation during main power loss |
| Ultra-Low Standby Power | 4.0 µA typical ISB3 current - achieved via CMOS-level input detection and dual CE/SEM gating |
| Dual Independent Ports | Fully asynchronous operation - no timing dependency between left/right accesses; tRC = 55 ns applies per port |
| TTL-Compatible Interface | Standard 5 V logic thresholds and drive strength - direct replacement for legacy SRAMs without level-shifting |
Applications
| Industrial Motion Controller | Avionics Data Concentrator |
|---|---|
Use Scenario: Two microcontrollers coordinate motor position updates and safety monitoring in real time. IC Role / Device Role / Timing Role: Dual-port RAM provides shared buffer for encoder data and command queues; semaphores lock access to critical motion parameters. Use Value: Eliminates CPU stalls during cross-processor writes; 55 ns tRC enables sub-microsecond interlock response. |
Use Scenario: Flight management unit and sensor acquisition module exchange telemetry packets over shared memory. IC Role / Device Role / Timing Role: Acts as deterministic message-passing buffer with hardware-enforced mutual exclusion via semaphore flags. Use Value: Guarantees atomic flag acquisition under EMI stress; 2 V retention preserves last valid sensor snapshot during brownout. |
| Medical Imaging Subsystem | Telecom Baseband Processor |
Use Scenario: Image acquisition FPGA and analysis DSP share frame buffers and metadata tables. IC Role / Device Role / Timing Role: Provides zero-wait-state memory access for pixel streaming; semaphore logic coordinates DMA buffer ownership. Use Value: Sustains 18.2 MB/s throughput (8-bit × 55 ns⁻¹) across both ports; ISB3 < 5 µA reduces thermal load in sealed enclosures. |
Use Scenario: Two baseband processors handle uplink/downlink channel processing with synchronized symbol timing. IC Role / Device Role / Timing Role: Serves as low-latency shared memory for FFT coefficients and filter taps; semaphores manage coefficient update handoff. Use Value: 55 ns tRC aligns with 18.2 MHz symbol clock; industrial temp rating ensures reliability in outdoor cabinet deployments. |
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 | 4K × 16 organization, 25 ns access, 3.3 V supply only - no 2 V retention or industrial temp option | Requires voltage translation in 5 V systems; lacks battery backup capability | Choose only if 16-bit data width and 3.3 V architecture are mandatory |
| IDT71422LA55J | Same pinout and function but 8K × 8 capacity; higher ICC (240 mA vs 160 mA typ) and larger package footprint | Direct upgrade path for memory expansion; requires PCB layout revision for larger TQFP | Select when future scalability to 8K is required and board space allows larger package |
Compared with CY7C1354V25 and IDT71422LA55J, the IDT71342LA55J uniquely balances 5 V compatibility, 2 V data retention, industrial temperature support, and minimal standby power - making it optimal for cost-sensitive, power-constrained dual-CPU systems where pin compatibility and legacy interface preservation are essential.
Availability
IDT71342LA55J is available at Aetrix Electronics and suitable for industrial motion controllers, avionics data concentrators, and medical imaging subsystems requiring stable component supply across extended product lifecycles.
Supply support for IDT71342LA55J 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.
The IDT71342LA55J belongs to IDT's dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems where hardware semaphore arbitration replaces software-based locking.
FAQ
What is the maximum operating frequency supported by the IDT71342LA55J?
The IDT71342LA55J does not operate at a fixed clock frequency but supports asynchronous operation with a maximum read cycle time (tRC) of 55 ns. This corresponds to an effective maximum sustained access rate of approximately 18.2 million operations per second per port. The device has no internal clock - timing is governed solely by external control signal setup/hold and propagation delays as specified in Tables 09b and 10b of the datasheet.
Does the IDT71342LA55J support true simultaneous read/write between ports?
Yes, the IDT71342LA55J supports fully independent asynchronous access: the left port can perform a read while the right port executes a write - or vice versa - without interference. However, simultaneous writes to the same memory location (non-semaphore) cause undefined data; semaphore locations are protected against such conflicts by dedicated hardware logic that resolves contention deterministically.
How does the 2 V data retention feature work in the IDT71342LA55J?
The IDT71342LA55J retains stored data when VCC drops to as low as 2.0 V, drawing only 100–1500 µA typical current (ICCDR). This mode activates automatically when CE and SEM are held high and VCC remains ≥2.0 V. It is exclusive to the LA variant and requires no external circuitry - enabling seamless backup during main power interruption in industrial and medical systems.
Can the semaphore flags in the IDT71342LA55J be accessed by both ports simultaneously?
No - semaphore flags are accessed exclusively via the SEM pin: when SEM = VIL on one port, that port gains sole access to the 8-flag register space (addressed by A0–A2), while the other port's SEM remains inactive (VIH) and cannot read or modify those flags. This ensures atomic flag acquisition; simultaneous attempts are resolved in hardware with guaranteed single-side grant.
What package options are available for the IDT71342LA55J?
The IDT71342LA55J is manufactured exclusively in the 64-pin TQFP (PNG64) package: 14 mm × 14 mm body, 1.4 mm height, 0.5 mm lead pitch, RoHS-compliant. The 52-pin PLCC variant (PLG52) is offered only for earlier speed grades (e.g., IDT71342LA25J) and is not available for the 55 ns version.
71342LA55J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
71342LA55J FAQ
1.How can I place an order for 71342LA55J through Aetrix?
Please submit a Request for Quotation (RFQ) for 71342LA55J 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 71342LA55J reliable?
The price and inventory of 71342LA55J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71342LA55J is usually 5 days.
3.What payment methods are accepted for 71342LA55J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71342LA55J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71342LA55J?
71342LA55J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71342LA55J 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 71342LA55J?
For technical support, including 71342LA55J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71342LA55J requirements.
6.How does Aetrix verify that 71342LA55J is sourced from the original manufacturer or authorized distributors?
All 71342LA55J 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 71342LA55J meets industry standards.
7.What is the process for return or replacement of 71342LA55J?
All 71342LA55J units undergo pre-shipment inspection (PSI). If there is an issue with 71342LA55J, 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 71342LA55J part is unused and in its original packaging.
Return procedure for 71342LA55J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71342LA55J Tags
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AT24C02C-XHM-T
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