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Renesas 71342LA55J8
- Part No.:
- 71342LA55J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71342LA55J8.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,416
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Product details
Overview
IDT71342LA55J8 from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with integrated hardware semaphore logic, operating at 55 ns maximum read/write cycle time over industrial temperature range (–40°C to +85°C), supporting independent asynchronous access from left and right ports, and enabling interprocessor resource arbitration in real-time embedded control systems.
For engineers reviewing the IDT71342LA55J8 datasheet, IDT71342LA55J8 pinout, IDT71342LA55J8 application, or IDT71342LA55J8 equivalent, this device serves as a low-power, battery-backed dual-access memory for deterministic multi-processor synchronization-particularly where zero-wait-state semaphore handshaking and 2V data retention are required.
Technical Context
The IDT71342LA55J8 implements fully independent left/right port control logic with separate address, data, and enable pins (CEL/CER, OEL/OER, R/WL/R/WR), allowing concurrent read/write operations without bus contention except on shared memory locations. Its on-chip semaphore block comprises eight dedicated latches accessible via A0–A2 under SEM = VIL, with active-low token semantics and automatic contention resolution.
It supports TTL-compatible 5V ±10% operation, features automatic power-down when CE and SEM are both HIGH, and provides battery backup data retention down to 2V (typical ICCDR = 100 µA) - a capability exclusive to LA-grade variants and confirmed for IDT71342LA55J8 per datasheet Table 7.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 8 bits (4096 words × 8-bit wide), dual-port architecture with physically separate I/O paths |
| Access Time (tAA) | 55 ns max - defines worst-case delay from valid address to stable output data |
| Read Cycle Time (tRC) | 55 ns max - minimum interval between successive read operations on same port |
| Write Cycle Time (tWC) | 55 ns max - minimum interval required to complete a write operation |
| Data Retention Voltage | 2.0 V min - enables reliable non-volatile hold mode using external backup battery |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Supply Voltage | 4.5 V to 5.5 V - single 5V ±10% rail, TTL-level compatible inputs and outputs |
| Standby Current (ISB3) | 0.2 mA typ. - ultra-low full-standby power when both ports disabled with CMOS-level inputs |
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 (4K = 2¹²) |
| A0R–A11R | Right port address inputs | Independent 12-bit address bus for right-side memory access |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit parallel data path; direction controlled by R/WL |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit parallel data path; direction controlled by R/WR |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; HIGH disables port and enters standby |
| OEL / OER | Output enable (left/right) | Active-low enables output drivers; used during reads |
| R/WL / R/WR | Read/write control (left/right) | High = read, Low = write; controls data direction on I/O bus |
| SEML / SEMR | Semaphore flag control (left/right) | Active-low selects semaphore register space (A0–A2 only); enables token request/release |
| VCC | Power supply | Single 5V ±10% supply; all VCC pins must be connected |
| GND | Ground | Reference for all signals; all GND pins must be connected |
Key Features
| Feature | Design Value |
|---|---|
| Fully asynchronous dual-port operation | Enables simultaneous, independent read/write access from left and right processors without clock coordination |
| On-chip hardware semaphore logic | Eight dedicated binary flags with atomic set/test semantics and guaranteed single-winner arbitration on simultaneous requests |
| Battery backup data retention | Maintains stored data at 2V supply with typical current draw of 100 µA - critical for fail-safe system state preservation |
| Ultra-low standby power (ISB3) | 0.2 mA typical full-standby current enables energy-sensitive applications such as portable industrial controllers |
| TTL-compatible interface | Direct connection to legacy 5V microcontrollers and FPGAs without level-shifting circuitry |
| Industrial temperature qualification | Validated operation from –40°C to +85°C ensures reliability in harsh environments like motor drives and PLCs |
Applications
| Motor Control System | Redundant PLC Module |
|---|---|
Use Scenario: Two independent MCUs coordinate real-time torque and position loops while sharing calibration tables and fault logs. IC Role / Device Role / Timing Role: Dual-port RAM acts as synchronized shared memory buffer; semaphores arbitrate write access to safety-critical registers. Use Value: Eliminates software polling delays; guarantees sub-55 ns inter-processor handshaking for deterministic response within 100 µs control cycles. | Use Scenario: Primary and backup PLC CPUs maintain identical runtime states and switch seamlessly upon failure detection. IC Role / Device Role / Timing Role: IDT71342LA55J8 stores mirrored process images; semaphores lock update sequences during state synchronization. Use Value: Enables zero-downtime switchover with verified atomic updates - no race conditions during hot standby transitions. |
| Digital Signal Processor Bridge | Avionics Data Concentrator |
Use Scenario: DSP offloads FFT processing while host ARM processor manages I/O and scheduling; both require concurrent access to input buffers and result queues. IC Role / Device Role / Timing Role: IDT71342LA55J8 serves as low-latency communication channel; semaphores signal buffer full/empty status without interrupt overhead. Use Value: Achieves sustained 18 MB/s aggregate bandwidth (55 ns × 8-bit × 2 ports) with no wait states - essential for real-time radar waveform processing. | Use Scenario: Multiple sensor nodes (IMU, pressure, temp) feed time-stamped data into a central avionics computer requiring deterministic latency and fault isolation. IC Role / Device Role / Timing Role: IDT71342LA55J8 stores time-tagged sensor frames; semaphores serialize writes from six independent ARINC-429 receivers. Use Value: Guarantees atomic frame capture at 10 kHz sample rate with <100 ns inter-port skew - meets DO-254 timing assurance 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 |
|---|---|---|---|
| CY7C1342BV33-55AC | 3.3V core supply, 55 ns access, 4K × 8, but lacks battery backup and 2V retention capability | Suitable for newer 3.3V systems; not usable in legacy 5V or battery-retained designs | Select only if migrating to 3.3V infrastructure and waiving data retention below 3V. |
| AS7C34098B-55JCIN | 5V-only, 55 ns, 4K × 8, no integrated semaphore logic - requires external arbitration logic or software-only protocols | Requires additional gates or firmware overhead for interprocessor sync; increases BOM and latency | Choose only when semaphore functionality is implemented externally or unnecessary for the architecture. |
Compared with CY7C1342BV33-55AC and AS7C34098B-55JCIN, IDT71342LA55J8 uniquely delivers 5V operation, hardware semaphore arbitration, and 2V battery retention in a single monolithic device - eliminating level shifters, external logic, and non-volatile backup capacitors required by alternatives.
Availability
IDT71342LA55J8 is available at Aetrix Electronics and suitable for motor control systems, redundant PLC modules, digital signal processor bridges, and avionics data concentrators requiring stable component supply across extended product lifecycles.
Supply support for IDT71342LA55J8 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, RF, and sensor signal conditioning ICs for high-performance computing and industrial applications.
IDT71342LA55J8 belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic multi-processor systems requiring hardware-accelerated resource arbitration and fail-safe data retention - targeting industrial automation, aerospace, and test equipment markets.
FAQ
What is the maximum operating speed of the IDT71342LA55J8?
The IDT71342LA55J8 has a guaranteed maximum read cycle time (tRC) and write cycle time (tWC) of 55 ns across the full industrial temperature range (–40°C to +85°C), corresponding to a theoretical maximum throughput of approximately 18.2 million operations per second per port. This speed is validated under VCC = 5.0 V ±10% and applies to both SRAM and semaphore access modes as specified in datasheet Tables 9b and 10b.
Does the IDT71342LA55J8 support battery backup operation?
Yes, the IDT71342LA55J8 supports battery backup data retention at 2.0 V minimum supply voltage, with typical retention current of 100 µA (max 1500 µA) as confirmed in datasheet Table 7. This feature is exclusive to LA-grade variants and enables non-volatile storage of critical system state during main power loss - a key differentiator versus SA-grade or competing dual-port SRAMs.
How does semaphore arbitration work on the IDT71342LA55J8?
The IDT71342LA55J8 implements eight dedicated hardware semaphore latches accessed via A0–A2 when SEM = VIL. Each latch uses active-low token semantics: writing '0' requests the token, writing '1' releases it. Simultaneous requests are resolved deterministically - the first arriving request wins, and if perfectly concurrent, the winner is arbitrarily assigned. This eliminates software polling and guarantees atomic interprocessor synchronization.
What package type is used for the IDT71342LA55J8?
The IDT71342LA55J8 is packaged in a 64-pin TQFP (Thin Quad Flat Package), designated PNG64, with dimensions of 14 mm × 14 mm × 1.4 mm. This surface-mount package supports automated assembly, offers superior thermal performance versus PLCC variants, and is RoHS-compliant per IDT documentation.
Can both ports of the IDT71342LA55J8 operate simultaneously?
Yes, the IDT71342LA55J8 supports true simultaneous operation: either port can perform independent read or write cycles at any time, provided they target different memory addresses. Concurrent access to the same non-semaphore location causes bus contention and undefined data; however, semaphore locations are protected against such conflicts via dedicated arbitration logic that ensures exclusive write access per flag.
71342LA55J8 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:
- 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)
71342LA55J8 FAQ
1.How can I place an order for 71342LA55J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71342LA55J8 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 71342LA55J8 reliable?
The price and inventory of 71342LA55J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71342LA55J8 is usually 5 days.
3.What payment methods are accepted for 71342LA55J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71342LA55J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71342LA55J8?
71342LA55J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71342LA55J8 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 71342LA55J8?
For technical support, including 71342LA55J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71342LA55J8 requirements.
6.How does Aetrix verify that 71342LA55J8 is sourced from the original manufacturer or authorized distributors?
All 71342LA55J8 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 71342LA55J8 meets industry standards.
7.What is the process for return or replacement of 71342LA55J8?
All 71342LA55J8 units undergo pre-shipment inspection (PSI). If there is an issue with 71342LA55J8, 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 71342LA55J8 part is unused and in its original packaging.
Return procedure for 71342LA55J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71342LA55J8 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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