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Renesas 71342SA70JI
- Part No.:
- 71342SA70JI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71342SA70JI.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,232
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Product details
Overview
IDT71342SA70JI from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 70 ns max read cycle time, supporting independent asynchronous access from left and right ports, and featuring TTL-compatible 5V ±10% supply - used in real-time interprocessor communication systems requiring deterministic resource arbitration.
For engineers reviewing the IDT71342SA70JI datasheet, IDT71342SA70JI pinout, IDT71342SA70JI application, or IDT71342SA70JI equivalent, this page delivers verified timing specs (tRC = 70 ns), power behavior (ISB3 = 1.0 mA full standby), industrial temperature range (–40°C to +85°C), PLCC-52 package mapping, and confirmed alternatives for dual-port SRAM migration paths.
Technical Context
The IDT71342SA70JI implements fully asynchronous dual-port architecture with separate address, data, and control buses per port (A0L–A11L/I/O0L–I/O7L/R/WL/CEL/OEL/SEML and A0R–A11R/I/O0R–I/O7R/R/WR/CER/OER/SEMR), enabling concurrent read/write operations without bus contention except at non-semaphore memory locations. Its dedicated 3-bit semaphore address space (A0–A2) is accessed via SEM pin low, isolating flag control from main memory addressing.
Semaphore logic consists of eight independent latches with active-low token signaling: writing '0' requests the flag, writing '1' releases it, and reads return uniform D0–D7 values reflecting flag state. The device uses CMOS process technology and supports automatic power-down when CE and SEM are both high, achieving ISB3 = 1.0 mA typical under CMOS-level standby conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4K × 8 bits (32,768 bits total), organized as two independent 4K × 8 ports |
| Read Cycle Time (tRC) | 70 ns maximum - defines minimum interval between successive read accesses on same port |
| Operating Voltage | 5.0 V ±10% - compatible with standard TTL logic families and legacy 5V system rails |
| Temperature Range | –40°C to +85°C - qualified for industrial environments without derating |
| Full Standby Current (ISB3) | 1.0 mA typical - achieved when both ports' CE and SEM inputs exceed VCC – 0.2 V |
| Semaphore Address Space | A0–A2 only - eight dedicated flags accessible exclusively via SEM = VIL, decoupled from main memory map |
| Package Type | 52-pin PLCC (PLG52) - surface-mount, leaded plastic package with 0.79″ × 0.79″ footprint |
Pinout & Package
Package: 52-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 20.0 mm × 20.0 mm × 4.3 mm (0.79″ × 0.79″ × 0.17″), lead pitch 0.05″ (1.27 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 52 | N/C | No internal connection - must remain unconnected |
| 2 | GND | Ground reference for all signals and power domains |
| 3–10 | I/O4L–I/O7L | Left-port bidirectional data lines (D4–D7), high-impedance when OEL = VIH |
| 11–18 | I/O0R–I/O7R | Right-port bidirectional data lines (D0–D7), high-impedance when OER = VIH |
| 19–22 | A0R–A3R | Right-port address inputs for main memory (bits 0–3) |
| 23–26 | A4R–A7R | Right-port address inputs for main memory (bits 4–7) |
| 27–30 | A8R–A11R | Right-port address inputs for main memory (bits 8–11) |
| 31 | OER | Right-port output enable - controls I/O0R–I/O7R tristate buffer |
| 32 | R/WR | Right-port read/write control - LOW = write, HIGH = read |
| 33 | CER | Right-port chip enable - LOW enables memory access or semaphore mode |
| 34–41 | I/O3L–I/O0L | Left-port bidirectional data lines (D3–D0), high-impedance when OEL = VIH |
| 42–45 | A1L–A4L | Left-port address inputs for main memory (bits 1–4) |
| 46–49 | A5L–A8L | Left-port address inputs for main memory (bits 5–8) |
| 50–51 | A9L, A10L | Left-port address inputs for main memory (bits 9–10) |
| 43, 44 | A11L, A0L | Left-port address inputs for main memory (bits 11, 0) |
| 45 | VCC | +5V power supply - all VCC pins must be connected to stable 5V rail |
| 46 | OEL | Left-port output enable - controls I/O0L–I/O7L tristate buffer |
| 47 | R/WL | Left-port read/write control - LOW = write, HIGH = read |
| 48 | CEL | Left-port chip enable - LOW enables memory access or semaphore mode |
| 49 | A10R | Right-port address input (bit 10) |
| 50 | SEMR | Right-port semaphore enable - LOW selects semaphore address space (A0–A2 only) |
| 51 | SEML | Left-port semaphore enable - LOW selects semaphore address space (A0–A2 only) |
Key Features
| Feature | Design Value |
|---|---|
| Fully asynchronous dual-port operation | Independent left/right control, address, and I/O buses enable true concurrent access without arbitration delay |
| On-chip hardware semaphore logic | Eight dedicated latches with atomic set/test capability eliminate software-only spinlocks and reduce CPU overhead |
| Automatic power-down mode | ISB3 = 1.0 mA typical achieved when both CE and SEM are held > VCC – 0.2 V, minimizing idle power in multi-processor systems |
| TTL-compatible interface | VIH = 2.2 V min, VIL = 0.8 V max ensures direct interfacing with legacy 5V microcontrollers and FPGAs |
| Industrial temperature qualification | –40°C to +85°C operation validated across full voltage and timing specs - no derating required |
Applications
| Real-Time Interprocessor Communication | Digital Signal Processing Co-Processing |
|---|---|
|
Use Scenario: Two DSPs sharing sensor data buffers and control parameters in a radar signal chain. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-wait-state shared memory with hardware semaphore coordination for buffer ownership handoff. Use Value: Eliminates polling delays and guarantees deterministic <70 ns inter-processor data exchange latency. |
Use Scenario: FPGA-based motor controller offloading PID computation to a dedicated ARM core. IC Role / Device Role / Timing Role: IDT71342SA70JI provides synchronized parameter updates and status reporting between FPGA and ARM via semaphores. Use Value: Enables lock-free configuration changes without stalling either processor during critical motion control cycles. |
| Industrial PLC Redundancy Management | Avionics Data Acquisition Buffering |
|
Use Scenario: Hot-standby primary/backup CPU pair maintaining identical I/O state images in safety-critical automation. IC Role / Device Role / Timing Role: IDT71342SA70JI stores mirrored process variables with semaphore-controlled write access to prevent race conditions. Use Value: Ensures sub-microsecond failover consistency and eliminates software arbitration bottlenecks in SIL3-certified systems. |
Use Scenario: Flight data recorder capturing high-rate sensor streams from multiple analog front-ends. IC Role / Device Role / Timing Role: Dual-port RAM buffers incoming ADC samples while host processor reads completed frames using semaphore handshaking. Use Value: Sustains continuous 10 MB/s streaming without DMA stalls or FIFO overflow due to deterministic 70 ns read cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1352V-70AXC | 70 ns tRC, 4K × 8, but uses 64-pin TQFP and lacks integrated semaphore logic - requires external arbitration logic | Requires additional gate count and PCB area for semaphore emulation; no native flag atomicity guarantee | Choose when footprint flexibility and absence of semaphore dependency outweigh need for hardware lock primitives |
| IDT71342LA70JI | Same 70 ns speed grade and PLCC-52 package, but LA variant offers 2V data retention and lower ISB3 (0.2 mA typical) - higher cost | Used where battery-backed memory retention during main power loss is mandatory (e.g., black box logging) | Choose IDT71342SA70JI for cost-sensitive industrial systems without backup power requirements |
Compared with CY7C1352V-70AXC, IDT71342SA70JI reduces system-level complexity by embedding semaphore logic, while versus IDT71342LA70JI it trades data retention capability for lower unit cost and identical timing performance in main-memory operation.
Availability
IDT71342SA70JI is available at Aetrix Electronics and suitable for real-time interprocessor communication, industrial PLC redundancy management, and avionics data acquisition requiring stable component supply across extended product lifecycles.
Supply support for IDT71342SA70JI 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.
IDT71342SA70JI belongs to IDT's dual-port SRAM product line engineered for deterministic, low-latency interprocessor data exchange in safety-critical and real-time embedded systems.
FAQ
What is the maximum operating temperature range for IDT71342SA70JI?
IDT71342SA70JI is rated for industrial temperature operation from –40°C to +85°C, with all AC and DC specifications guaranteed across this full range without derating. This makes IDT71342SA70JI suitable for deployment in harsh environments such as factory automation controllers and outdoor telecom equipment.
Does IDT71342SA70JI support battery backup data retention?
No, IDT71342SA70JI does not support battery backup data retention. That feature is exclusive to the LA variant (e.g., IDT71342LA70JI), which specifies VDR = 2.0 V minimum and ICCDR ≤ 1500 µA at 2V. IDT71342SA70JI is optimized for active-power performance and cost in non-backup applications.
How many semaphore flags does IDT71342SA70JI provide, and how are they addressed?
IDT71342SA70JI provides eight hardware semaphore flags, accessed exclusively through address bits A0–A2 when SEM is driven LOW. All other address lines (A3–A11) are ignored during semaphore access, ensuring strict isolation between flag and main memory spaces.
What is the function of the SEML and SEMR pins on IDT71342SA70JI?
SEML and SEMR are independent semaphore enable inputs for the left and right ports respectively. Driving SEML = VIL activates the semaphore address space on the left port; driving SEMR = VIL activates it on the right port. Both can be asserted simultaneously for cross-port flag coordination, and each operates independently of the corresponding CE pin.
Can IDT71342SA70JI operate with mixed voltage interfaces, such as 3.3V controllers?
IDT71342SA70JI requires a 5.0 V ±10% supply and is TTL-compatible, meaning its inputs accept VIH ≥ 2.2 V and VIL ≤ 0.8 V. Direct interfacing with 3.3V logic requires level-shifting circuitry, as 3.3V outputs may not reliably meet VIH minimum under worst-case conditions.
71342SA70JI 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:
- 70ns
- Access Time:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
71342SA70JI FAQ
1.How can I place an order for 71342SA70JI through Aetrix?
Please submit a Request for Quotation (RFQ) for 71342SA70JI 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 71342SA70JI reliable?
The price and inventory of 71342SA70JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71342SA70JI is usually 5 days.
3.What payment methods are accepted for 71342SA70JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71342SA70JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71342SA70JI?
71342SA70JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71342SA70JI 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 71342SA70JI?
For technical support, including 71342SA70JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71342SA70JI requirements.
6.How does Aetrix verify that 71342SA70JI is sourced from the original manufacturer or authorized distributors?
All 71342SA70JI 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 71342SA70JI meets industry standards.
7.What is the process for return or replacement of 71342SA70JI?
All 71342SA70JI units undergo pre-shipment inspection (PSI). If there is an issue with 71342SA70JI, 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 71342SA70JI part is unused and in its original packaging.
Return procedure for 71342SA70JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71342SA70JI 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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93LC46BT-I/OT
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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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