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Renesas 71342LA55PF
- Part No.:
- 71342LA55PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71342LA55PF.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,457
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Product details
Overview
IDT71342LA55PF from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with integrated hardware semaphore logic, operating at 55 ns read/write cycle time, supporting independent asynchronous access on 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 IDT71342LA55PF datasheet, IDT71342LA55PF pinout, IDT71342LA55PF application, or IDT71342LA55PF equivalent, key selection considerations include dual-port timing compatibility (tRC = 55 ns), industrial temperature range (–40°C to +85°C), 52-pin PLCC package footprint, and hardware semaphore flag behavior (active-low, A0–A2 addressable, D0-only write).
Technical Context
The IDT71342LA55PF implements fully asynchronous dual-port SRAM architecture with physically separate left/right address, control, and I/O buses - enabling simultaneous read/write operations across ports without bus contention. Its on-chip semaphore logic block contains eight independent latches accessible via SEM = VIL and A0–A2, with atomic set/test capability and automatic contention resolution.
Each port supports TTL-compatible 5 V ±10% operation, with CE- and SEM-controlled power-down modes yielding ISB3 standby current as low as 0.2 mA (typ.) per port. The device uses CMOS process technology and provides battery backup data retention at VCC = 2.0 V (LA version only), with ICCDR ≤ 1500 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 8 bits (4096 words × 8-bit wide), dual-port architecture with separate left/right address/data/control paths |
| Access Time (tAA) | 55 ns max - determines minimum clock-to-data latency for single-port reads in high-speed controller interfaces |
| Read Cycle Time (tRC) | 55 ns max - defines shortest interval between successive read operations on same port |
| Data Retention Voltage | 2.0 V min - enables battery-backed operation during main power loss, preserving contents without refresh |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor control and telecom infrastructure |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL logic families and legacy backplane systems |
| Standby Current (ISB3) | 0.2 mA typ. - enables ultra-low-power sleep mode when both ports are deselected with CMOS-level inputs |
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 |
|---|---|---|
| A0L–A11L | Left port address inputs | 12-bit address bus for left-side memory access; A0–A2 also select one of eight semaphore flags when SEM = VIL |
| A0R–A11R | Right port address inputs | 12-bit address bus for right-side memory access; independent of left port addressing |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; high-impedance when OEL = VIH or CEL = VIH; D0 used exclusively for semaphore writes |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; high-impedance when OER = VIH or CER = VIH; D0 used exclusively for semaphore writes |
| CEL / CER | Left/right chip enable | Active-low enables respective port; when both high, port enters ISB1/ISB3 low-power mode |
| OEL / OER | Left/right output enable | Active-low controls data bus drivers; allows read-only access while keeping write path inactive |
| R/WL / R/WR | Left/right write enable | Active-low initiates write cycle; must overlap with CE and proper address setup per tAS/tWP timing |
| SEML / SEMR | Semaphore flag status outputs | Active-low open-collector outputs indicating token ownership; driven only when SEM = VIL and OE active |
| SEM | Semaphore select | Active-low chip select for semaphore register space; disables SRAM access and enables A0–A2 semaphore addressing |
| VCC / GND | Power supply | All VCC pins must be connected to 5 V ±10%; all GND pins tied to common ground plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Hardware semaphore logic | Eight dedicated binary flags with atomic set/test, contention resolution, and side-specific write lockout - eliminates need for software polling loops |
| Asynchronous dual-port operation | Independent left/right control, address, and data buses allow true concurrent access - no arbitration delay or wait states |
| Battery backup data retention | Operates down to 2.0 V with ICCDR ≤ 1500 µA - preserves memory contents during AC failure or brownout in industrial PLCs |
| Low-power standby modes | Four ISB modes (ISB1–ISB4) selectable via CE/SEM input levels - enables granular power gating per port |
| TTL-compatible interface | 5 V ±10% supply, VIH ≥ 2.2 V, VIL ≤ 0.8 V - interoperable with legacy microcontrollers, FPGAs, and ASICs without level shifters |
Applications
| Industrial Motion Control | Telecom Line Card Buffering |
|---|---|
Use Scenario: Two DSPs coordinate motor phase sequencing and encoder feedback in real time using shared memory buffers. IC Role / Device Role / Timing Role: Dual-port SRAM serves as zero-latency inter-DSP mailbox; semaphores coordinate access to critical motion parameters. Use Value: Eliminates software handshake delays; guarantees deterministic response under 55 ns timing budget for closed-loop servo updates. |
Use Scenario: Line card FPGA and host processor exchange packet headers and status flags across a shared memory region. IC Role / Device Role / Timing Role: IDT71342LA55PF provides non-blocking read/write paths for header buffering and flow control metadata. Use Value: Enables full-duplex packet processing at OC-48 line rates without CPU stalling or FIFO overflow. |
| Avionics Data Acquisition | Medical Imaging Subsystem |
Use Scenario: Flight computer and sensor acquisition module concurrently log telemetry and trigger event snapshots. IC Role / Device Role / Timing Role: Left port captures ADC streams; right port services diagnostic queries - both accessing overlapping buffer regions. Use Value: Maintains data coherency via hardware semaphores; retains critical flight logs during 2 V brownout per DO-160 Section 16. |
Use Scenario: Image processor and display controller share frame buffers and calibration tables in MRI subsystem. IC Role / Device Role / Timing Role: Dual-port RAM decouples image reconstruction pipeline from real-time display refresh cycles. Use Value: Prevents visual artifacts by eliminating frame tearing; supports 60 Hz display update with sub-millisecond latency. |
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, 100-pin TQFP; no battery backup; supports JTAG boundary scan | Higher bandwidth but larger footprint; requires PCB redesign and firmware adaptation for 16-bit data path | Choose when system demands wider data bus and faster timing, and board space permits 100-pin layout |
| IDT71322LA55PF | 2K × 8 organization, identical 55 ns timing, same 52-pin PLCC package, and LA battery retention | Half memory depth; suitable for simpler interprocessor handshaking where 2K buffer suffices | Drop-in replacement if design does not require full 4K capacity - reduces cost and power slightly |
Compared with CY7C1354V25 and IDT71322LA55PF, the IDT71342LA55PF uniquely balances 4K × 8 density, 55 ns industrial-grade timing, 52-pin PLCC compatibility, and 2 V data retention - making it optimal for space-constrained, safety-critical dual-processor systems requiring guaranteed memory persistence.
Availability
IDT71342LA55PF is available at Aetrix Electronics and suitable for industrial motion control, avionics data logging, and telecom line card buffering requiring stable component supply across extended product lifecycles.
Supply support for IDT71342LA55PF 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 IDT71342 family targets real-time embedded systems requiring deterministic interprocessor communication - delivering hardware-accelerated semaphore arbitration and low-latency dual-port memory in compact packages.
FAQ
What is the maximum operating temperature range for the IDT71342LA55PF?
The IDT71342LA55PF is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per manufacturer characterization and applies to all DC and AC electrical parameters in the datasheet, including tRC = 55 ns timing and ISB3 standby current of 0.2 mA (typ.). It is not qualified for extended temperature ranges beyond this limit.
Does the IDT71342LA55PF support battery backup, and what voltage is required?
Yes, the IDT71342LA55PF supports battery backup data retention at VCC = 2.0 V minimum, with typical ICCDR of 100 µA and maximum of 1500 µA. This feature is exclusive to LA-grade devices and is verified under TA = +25°C per datasheet Table 7; retention is not guaranteed below 2.0 V.
How are the semaphore flags addressed and controlled on the IDT71342LA55PF?
Semaphore flags are accessed by asserting SEM = VIL (active-low), then using A0–A2 to select one of eight flags. Only I/O0 is used for writing; reads return the flag state across all eight I/O lines. The IDT71342LA55PF implements atomic set/test behavior: writing '0' requests the token, writing '1' releases it, and contention is resolved in hardware per Truth Table II.
What package type is used for the IDT71342LA55PF, and are there alternatives?
The IDT71342LA55PF uses a 52-pin Plastic Leaded Chip Carrier (PLCC) package with 0.635 mm lead pitch. While the same IDT71342LA family offers a 64-pin TQFP variant (e.g., IDT71342LA55PFG), the 'PF' suffix specifically denotes the 52-pin PLCC configuration - no pin-compatible alternative package exists for this exact speed grade and temperature range.
Can both ports of the IDT71342LA55PF perform simultaneous read/write operations on the same memory location?
No - simultaneous read/write to the same non-semaphore memory location causes undefined data. The IDT71342LA55PF permits concurrent access only to distinct addresses. Semaphore locations (A0–A2) are protected against conflict via hardware arbitration, but general SRAM cells require software coordination or address partitioning to avoid corruption.
71342LA55PF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- 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:
- 64-TQFP (14x14)
71342LA55PF FAQ
1.How can I place an order for 71342LA55PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 71342LA55PF 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 71342LA55PF reliable?
The price and inventory of 71342LA55PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71342LA55PF is usually 5 days.
3.What payment methods are accepted for 71342LA55PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71342LA55PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71342LA55PF?
71342LA55PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71342LA55PF 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 71342LA55PF?
For technical support, including 71342LA55PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71342LA55PF requirements.
6.How does Aetrix verify that 71342LA55PF is sourced from the original manufacturer or authorized distributors?
All 71342LA55PF 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 71342LA55PF meets industry standards.
7.What is the process for return or replacement of 71342LA55PF?
All 71342LA55PF units undergo pre-shipment inspection (PSI). If there is an issue with 71342LA55PF, 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 71342LA55PF part is unused and in its original packaging.
Return procedure for 71342LA55PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71342LA55PF Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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