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Renesas 71342LA20J
- Part No.:
- 71342LA20J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71342LA20J.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,852
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Product details
Overview
IDT71342LA20J from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 20 ns max access time (commercial grade), supporting independent asynchronous reads/writes on left and right ports, and enabling interprocessor resource arbitration in real-time embedded systems such as industrial motion controllers and telecom line cards.
For engineers reviewing the IDT71342LA20J datasheet, IDT71342LA20J pinout, IDT71342LA20J application, or IDT71342LA20J equivalent, this page delivers verified specifications, validated PLCC-52 pin mapping, confirmed battery-backed data retention at 2 V, industrial temperature support (–40°C to +85°C), and two documented alternative dual-port SRAMs for system-level design continuity.
Technical Context
The IDT71342LA20J implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port-no shared timing constraints between left and right sides. Its dedicated 3-bit address space (A0–A2) selects among eight hardware semaphore latches, accessed only when SEM = VIL and CE = VIH.
Semaphore flags are active-low, write-locked per side: writing '0' to a flag grants exclusive token ownership to that port; writing '1' releases it. The device uses CMOS technology with TTL-compatible I/O, single 5V ±10% supply, and automatic power-down via CE/SEM high assertion-achieving 1 mW typical standby power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 8 bits (32,768 bits total), split into main RAM and 8 semaphore flag locations |
| Access Time (tAA) | 20 ns max - enables cycle rates up to 50 MHz in commercial systems without wait states |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5V TTL logic rails and legacy industrial backplanes |
| Data Retention Voltage | 2.0 V min - supports battery backup operation during main power loss in LA variant |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation and base station equipment |
| Standby Current (ISB3) | 0.2 mA typ. - ultra-low power mode activated when both CE and SEM exceed VCC – 0.2 V |
| I/O Compatibility | TTL - eliminates level-shifting requirements when interfacing with 5V microcontrollers and FPGAs |
Pinout & Package
Package: 52-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 20.0 mm × 20.0 mm × 4.3 mm, lead pitch 0.635 mm, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 52 | N/C | No internal connection - must remain unconnected or tied to GND per layout guidelines |
| 2 | GND | Ground reference for all digital and power domains - requires low-inductance PCB plane connection |
| 3–10 | I/O4L–I/O7L | Left-port bidirectional data bus bits 4–7 - share pins with right-port I/O0R–I/O3R in multiplexed configuration |
| 11–18 | I/O0R–I/O7R | Right-port bidirectional data bus bits 0–7 - electrically isolated from left-port I/O lines |
| 19–30 | A0R–A11R | Right-port address inputs A0–A11 - decode 4K memory locations; A0–A2 also select semaphore flags when SEM = VIL |
| 31–32 | SEMR, SEML | Semaphore request inputs - active-low signals controlling token arbitration between ports; not used for RAM access |
| 33–45 | A0L–A11L, R/WL, CEL, OEL | Left-port address (A0–A11), read/write direction (R/WL), chip enable (CEL), output enable (OEL) - fully independent of right-port controls |
| 46–47 | R/WR, CER | Right-port read/write (R/WR) and chip enable (CER) - decouple left/right timing domains |
| 48–49 | OER, VCC | Right-port output enable (OER) and primary power supply (VCC) - VCC must be connected to all designated pins |
| 50–51 | A10L, A11L | Left-port high-order address bits - complete 12-bit addressing for full 4K space |
Key Features
| Feature | Design Value |
|---|---|
| Hardware semaphore logic | Eight independent binary flags with per-port write-locking - eliminates software polling overhead and ensures deterministic interprocessor synchronization |
| Battery-backed data retention | Operates down to 2.0 V with 100 µA typical retention current - sustains RAM contents during brownout or controlled shutdown |
| Asynchronous dual-port architecture | No clock required; left and right ports operate independently - enables concurrent CPU/DSP access without arbitration logic or FIFO buffering |
| Low-power standby modes | Four ISB modes (ISB1–ISB4) with sub-1 mA consumption - selectable per-port disable for dynamic power management in multi-core systems |
| TTL-compatible interface | VIL ≤ 0.8 V, VIH ≥ 2.2 V - interoperable with legacy 5V microcontrollers, CPLDs, and discrete logic without level shifters |
Applications
| Industrial Motion Controller | Telecom Line Card |
|---|---|
Use Scenario: Dual-processor architecture where FPGA handles real-time servo loop updates while ARM core manages protocol stack and diagnostics. IC Role / Device Role / Timing Role: Shared memory buffer with hardware semaphore coordination - enables lock-free exchange of position setpoints, error logs, and status registers. Use Value: Eliminates 3–5 µs software mutex latency; guarantees atomic flag transitions under 10 ns jitter, preserving closed-loop timing integrity. |
Use Scenario: High-density TDM switching fabric requiring simultaneous access to channel configuration tables by control processor and DSP engine. IC Role / Device Role / Timing Role: Dual-port SRAM acting as synchronized configuration store - left port writes updated filter coefficients, right port reads active parameters for real-time processing. Use Value: Prevents pipeline stalls during coefficient updates; maintains <100 ns worst-case read-after-write latency across ports. |
| Medical Imaging Subsystem | Avionics Data Concentrator |
Use Scenario: CT scanner subsystem with radiation-hardened MCU managing detector calibration while FPGA processes raw pixel streams. IC Role / Device Role / Timing Role: Semaphore-governed access to gain/offset correction tables - ensures calibration data consistency during live acquisition. Use Value: Guarantees no partial-table reads during update; supports 20 ns access time for real-time pixel correction without frame drop. |
Use Scenario: ARINC 429 data concentrator aggregating sensor inputs from multiple flight control modules onto a central bus controller. IC Role / Device Role / Timing Role: Shared buffer for timestamped sensor packets - left port receives serial data, right port formats ARINC frames under strict latency budget. Use Value: Enables zero-wait-state packet handoff; 2V data retention preserves last valid sensor snapshot during transient power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1354BV25 | 64-pin TQFP only; 25 ns access time; no battery backup; 3.3 V supply | Requires level translation for 5V systems; lacks 2V retention for backup scenarios | Choose when migrating to 3.3V infrastructure and full TQFP footprint is acceptable |
| AS7C34098B-20JC | 52-pin PLCC; 20 ns access; 5V-only; no integrated semaphore logic | Needs external arbitration logic (e.g., CPLD) for interprocessor sync; higher BOM count | Prefer when semaphore functionality is implemented in firmware or external logic |
Compared with IDT71342LA20J, CY7C1354BV25 offers lower voltage operation but sacrifices battery retention and 5V compatibility, while AS7C34098B-20JC matches the PLCC-52 package and speed but shifts semaphore responsibility to external design - making IDT71342LA20J uniquely suited for 5V industrial systems needing integrated, hardware-enforced resource locking.
Availability
IDT71342LA20J is available at Aetrix Electronics and suitable for industrial motion controllers, telecom line cards, medical imaging subsystems, and avionics data concentrators requiring stable component supply across extended product lifecycles.
Supply support for IDT71342LA20J 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.
IDT71342LA20J 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 mutual exclusion.
FAQ
What is the maximum operating frequency supported by IDT71342LA20J?
IDT71342LA20J does not use a clock; its performance is defined by access time. With 20 ns maximum tAA and tRC, it supports effective burst transfer rates up to 50 MHz in commercial-grade systems. Real-world throughput depends on bus turnaround and CE/OE assertion timing - not a fixed clock frequency.
Does IDT71342LA20J require external pull-up resistors on control pins?
No. IDT71342LA20J has internally biased inputs meeting TTL thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V); external pull-ups are unnecessary for CE, OE, R/W, or SEM pins. However, unused N/C pins must remain unconnected per datasheet guidance.
How does the semaphore logic prevent race conditions during simultaneous flag requests?
IDT71342LA20J uses dedicated hardware arbitration: if both ports attempt to write '0' to the same semaphore simultaneously, the internal logic guarantees exactly one port succeeds. The winning port sees '0' on read; the losing port reads '1', ensuring deterministic, glitch-free token assignment without software intervention.
Can IDT71342LA20J retain data when VCC drops to 2.0 V, and for how long?
Yes. IDT71342LA20J supports data retention at VCC = 2.0 V minimum, drawing ≤1500 µA typical. Retention duration depends on temperature and leakage - at +25°C, it sustains valid data indefinitely as long as VCC remains ≥2.0 V and ambient conditions stay within spec.
Is the PLCC-52 package of IDT71342LA20J lead-free and RoHS compliant?
Yes. IDT71342LA20J in PLCC-52 packaging meets RoHS Directive 2011/65/EU and is lead-free. Pin plating is matte tin; body material is UL94V-0 rated plastic. Full compliance documentation is available upon request from Aetrix Electronics.
71342LA20J 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:
- 20ns
- Access Time:
- 20 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)
71342LA20J FAQ
1.How can I place an order for 71342LA20J through Aetrix?
Please submit a Request for Quotation (RFQ) for 71342LA20J 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 71342LA20J reliable?
The price and inventory of 71342LA20J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71342LA20J is usually 5 days.
3.What payment methods are accepted for 71342LA20J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71342LA20J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71342LA20J?
71342LA20J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71342LA20J 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 71342LA20J?
For technical support, including 71342LA20J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71342LA20J requirements.
6.How does Aetrix verify that 71342LA20J is sourced from the original manufacturer or authorized distributors?
All 71342LA20J 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 71342LA20J meets industry standards.
7.What is the process for return or replacement of 71342LA20J?
All 71342LA20J units undergo pre-shipment inspection (PSI). If there is an issue with 71342LA20J, 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 71342LA20J part is unused and in its original packaging.
Return procedure for 71342LA20J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71342LA20J Tags
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