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Renesas 71342SA20J
- Part No.:
- 71342SA20J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71342SA20J.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,415
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Product details
Overview
IDT71342SA20J from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, designed for interprocessor communication in real-time embedded systems. It delivers 20 ns max access time (commercial grade), operates at 5 V ±10%, supports fully asynchronous dual-port operation, and features hardware semaphore flags for conflict-free resource arbitration between left and right ports. It is used in industrial control backplanes requiring deterministic memory sharing.
For engineers reviewing the IDT71342SA20J datasheet, IDT71342SA20J pinout, IDT71342SA20J application, or IDT71342SA20J equivalent, key selection criteria include dual-port timing independence, semaphore flag latency (tSOP = 10 ns), 52-pin PLCC package compatibility, and TTL-level interface compliance without level-shifting.
Technical Context
The IDT71342SA20J implements two independent CMOS SRAM ports-left (L) and right (R)-each with dedicated address (A0L–A11L / A0R–A11R), data (I/O0L–I/O7L / I/O0R–I/O7R), and control lines (CEL/CER, OEL/OER, R/WL/R/WR). Semaphore logic resides in a separate 8-location address space (A0–A2 only) accessed via SEM pin assertion, with active-low token semantics and automatic contention resolution.
Its power management uses CE and SEM to gate port-level circuitry into low-power standby modes: ISB3 = 1.0 mA (typ.) full standby, ISB1 = 25 mA (typ.) TTL-level standby. The device requires no external arbitration logic and guarantees atomic semaphore acquisition even under simultaneous write attempts from both ports.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4K × 8 bits (4096 words × 8-bit wide), split across two independent address spaces |
| Access Time | 20 ns (max) - defines minimum read cycle time (tRC) for commercial-grade timing compliance |
| Supply Voltage | 5.0 V ±10% - TTL-compatible single-supply operation; no mixed-voltage interface required |
| Semaphore Latency | tSOP = 10 ns (min) - pulse width for SEM flag update, critical for tight interprocessor handshake loops |
| Standby Current | ISB3 = 1.0 mA (typ.) - full standby current with CMOS-level inputs, enabling low-power idle states |
| Operating Temp | 0°C to +70°C - commercial temperature range confirmed for IDT71342SA20J variant |
| Package | 52-pin PLCC (PLG52) - surface-mount compatible with standard reflow profiles and board-level repair accessibility |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low enable for respective port; controls power-down entry when HIGH |
| OEL / OER | Output Enable (Left / Right) | Active-low output driver control; enables tristate I/O during read cycles |
| R/WL / R/WR | Read/Write Control (Left / Right) | Active-low write command; determines direction of data flow per port |
| SEML / SEMR | Semaphore Select (Left / Right) | Active-low chip select for semaphore register space; disables SRAM access when asserted |
| A0L–A11L / A0R–A11R | Address Inputs (Left / Right) | 12-bit address bus per port; A0–A2 used exclusively for semaphore addressing when SEM active |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (Left / Right) | Bidirectional 8-bit data bus; D0 only used for semaphore writes; all bits reflect flag state on reads |
| VCC / GND | Power / Ground | Single 5 V supply; all VCC pins must be decoupled locally; all GND pins tied to common ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Fully asynchronous dual-port operation | Independent left/right access with zero port-to-port timing dependency - eliminates arbitration wait states |
| On-chip semaphore logic | Eight dedicated binary flags with atomic set/test semantics and guaranteed single-winner resolution on simultaneous requests |
| Hardware-controlled power-down | CE- and SEM-gated standby modes reduce dynamic current to ≤1.0 mA (typ.), extending system-level energy efficiency |
| TTL-compatible interface | Direct connection to 5 V microcontrollers and FPGAs without level shifters or pull-up resistors |
| Separate semaphore address space | A0–A2 only decode semaphore locations; avoids address collision with main 4K memory map |
Applications
| Industrial PLC Backplane | Real-Time Motion Controller |
|---|---|
|
Use Scenario: Two independent motion control CPUs share configuration tables and status registers over a shared memory bus. IC Role / Device Role / Timing Role: IDT71342SA20J serves as deterministic dual-port buffer with hardware semaphore coordination for synchronized axis updates. Use Value: Eliminates software polling delays; tSOP = 10 ns semaphore response ensures sub-microsecond resource handoff between controllers. |
Use Scenario: FPGA-based trajectory planner and ARM-based safety monitor exchange real-time position data and fault flags. IC Role / Device Role / Timing Role: IDT71342SA20J provides isolated, non-blocking read/write paths with atomic semaphore signaling for safe resource locking. Use Value: Prevents race conditions during emergency stop transitions; 20 ns access enables 50 MHz control loop synchronization. |
| Digital Signal Processor Co-Processor Interface | Avionics Data Concentrator |
|
Use Scenario: DSP and host processor concurrently access FFT coefficient tables and result buffers in radar signal processing subsystem. IC Role / Device Role / Timing Role: IDT71342SA20J acts as low-latency shared memory with hardware semaphore arbitration for pipeline stage handshaking. Use Value: Enables zero-wait-state memory sharing; eliminates DMA overhead and reduces jitter in time-critical signal chains. |
Use Scenario: Multiple LRUs (Line Replaceable Units) write sensor telemetry to a central memory hub while flight management software reads consolidated data. IC Role / Device Role / Timing Role: IDT71342SA20J functions as fault-tolerant dual-port data concentrator with semaphore-managed write priority. Use Value: Guarantees deterministic access ordering; ISB3 = 1.0 mA standby current supports extended battery-backed operation during power loss. |
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-20AXC | 25 ns access time, 64-pin TQFP only, no battery backup support | Requires PCB redesign for 64-pin footprint; lacks PLCC option for legacy repairability | Preferred where higher pin count allows routing flexibility and industrial temp range is mandatory |
| IDT71342LA25J | 25 ns access, industrial temp (–40°C to +85°C), lower standby current (ISB3 = 0.2 mA typ.) | Valid for extended temperature environments but slower timing margin than IDT71342SA20J | Select when operating in harsh environments and 25 ns latency is acceptable for system timing budget |
Compared with CY7C024AV-20AXC and IDT71342LA25J, the IDT71342SA20J offers the fastest commercial-grade access (20 ns) in the 52-pin PLCC package, making it optimal for space-constrained, high-throughput designs where legacy footprint compatibility and minimal timing slack are critical.
Availability
IDT71342SA20J is available at Aetrix Electronics and suitable for industrial PLC backplanes, real-time motion controllers, DSP co-processor interfaces, avionics data concentrators, and digital test equipment requiring stable component supply and long-term obsolescence management.
Supply support for IDT71342SA20J 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.
IDT71342SA20J belongs to IDT's legacy 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 access speed of the IDT71342SA20J?
The IDT71342SA20J has a maximum access time of 20 ns for both read and write operations under commercial temperature conditions (0°C to +70°C). This corresponds to a read cycle time (tRC) of 20 ns and is validated per AC Electrical Characteristics Table 9a in the official datasheet. The IDT71342SA20J achieves this performance using high-speed CMOS process technology and optimized internal decoding paths.
Does the IDT71342SA20J support battery backup operation?
No, the IDT71342SA20J does not support battery backup operation. Battery retention capability (VDR = 2.0 V, ICCDR ≤ 1500 µA) is exclusive to LA-grade variants such as IDT71342LA25J. The IDT71342SA20J is rated for commercial temperature range only and lacks the low-voltage retention circuitry present in LA versions.
How many semaphore flags does the IDT71342SA20J provide, and how are they accessed?
The IDT71342SA20J provides eight independent binary semaphore flags, each accessible via a dedicated 3-bit address (A0–A2) when SEM is asserted LOW. Only I/O0 is used for writing semaphore values (0 = request token, 1 = release), while all eight I/O lines reflect the flag state on reads. Access is fully isolated from the main 4K × 8 memory space.
What package type is used for the IDT71342SA20J?
The IDT71342SA20J is packaged in a 52-pin Plastic Leaded Chip Carrier (PLCC), designated PLG52. Its dimensions are approximately 20.0 mm × 20.0 mm × 4.3 mm, with standard PLCC lead form for through-hole or surface-mount assembly. This differs from the 64-pin TQFP option used by other variants like IDT71342LA25J.
Can both ports of the IDT71342SA20J perform simultaneous read and write operations?
Yes, the IDT71342SA20J supports fully asynchronous dual-port operation: the left and right ports can independently execute reads or writes to any memory location at the same time. However, simultaneous writes to the same non-semaphore address cause undefined data; semaphore locations are protected against such conflicts by dedicated hardware logic.
71342SA20J 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)
71342SA20J FAQ
1.How can I place an order for 71342SA20J through Aetrix?
Please submit a Request for Quotation (RFQ) for 71342SA20J 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 71342SA20J reliable?
The price and inventory of 71342SA20J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71342SA20J is usually 5 days.
3.What payment methods are accepted for 71342SA20J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71342SA20J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71342SA20J?
71342SA20J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71342SA20J 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 71342SA20J?
For technical support, including 71342SA20J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71342SA20J requirements.
6.How does Aetrix verify that 71342SA20J is sourced from the original manufacturer or authorized distributors?
All 71342SA20J 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 71342SA20J meets industry standards.
7.What is the process for return or replacement of 71342SA20J?
All 71342SA20J units undergo pre-shipment inspection (PSI). If there is an issue with 71342SA20J, 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 71342SA20J part is unused and in its original packaging.
Return procedure for 71342SA20J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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