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Renesas 71421LA25PF8
- Part No.:
- 71421LA25PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71421LA25PF8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,576
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Product details
Overview
IDT71421LA25PF8 from Integrated Device Technology (IDT) is a high-speed 2K × 8 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting fully asynchronous port-to-port communication with interrupt flags (INTL/INTR) and BUSY input arbitration logic. It operates at 5 V ±10%, delivers 25 ns max access time (industrial grade), retains data down to 2 V for battery backup, and is used in real-time interprocessor communication subsystems requiring deterministic contention resolution.
For engineers reviewing the IDT71421LA25PF8 datasheet, IDT71421LA25PF8 pinout, IDT71421LA25PF8 application, or IDT71421LA25PF8 equivalent, key selection criteria include its SLAVE-only BUSY input behavior, 2V data retention capability, industrial temperature range (–40°C to +85°C), and compatibility with IDT71321 MASTER devices in 16-bit-or-wider memory architectures.
Technical Context
The IDT71421LA25PF8 functions exclusively as a SLAVE dual-port SRAM: its BUSY pin is an input (not output), enabling write-inhibit arbitration when paired with an IDT71321 MASTER. It lacks on-chip arbitration logic - all BUSY-driven contention resolution is externally coordinated via the MASTER's BUSY output.
It supports two independent asynchronous ports (left/right), each with dedicated address (A0–A10), data (I/O0–I/O7), and control lines (CEL/CER, OEL/OER, R/WL/R/WR). Interrupt generation is triggered by writes to fixed mailbox addresses (7FEH for INTL, 7FFH for INTR), with set/reset timing specified at ≤25 ns (tINS/tINR).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (2048 words × 8 bits), 16 KB total capacity |
| Access Time (max) | 25 ns - guarantees deterministic read latency under industrial conditions (–40°C to +85°C) |
| Supply Voltage | 5.0 V ±10% - TTL-compatible single-supply operation; no level-shifting required |
| Data Retention Voltage | 2.0 V - enables low-power battery backup without external regulators or supervisors |
| Standby Current (ISB3) | 0.2 mA (typ.) - ultra-low full-standby power when both CE pins are high-impedance |
| Interrupt Timing (tINS/tINR) | ≤25 ns - ensures rapid interprocessor message acknowledgment in real-time systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded control and avionics interfaces |
Pinout & Package
Package: 64-pin TQFP (PNG64), 14 mm × 14 mm × 1.4 mm body, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for left-side memory access (0x000–0x7FF) |
| A0R–A10R | Right port address inputs | 11-bit address bus for right-side memory access (0x000–0x7FF) |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; high-impedance when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; high-impedance when OER = VIH or CER = VIH |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; controls automatic power-down mode |
| OEL / OER | Output enable (left/right) | Active-low enables I/O drivers; overrides R/W state for read-only access |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; determines direction of I/O data flow |
| INTL / INTR | Interrupt flags (output) | Open-drain outputs; require external pull-up; indicate mailbox writes (7FEH/7FFH) |
| BUSYL / BUSYR | BUSY input (SLAVE only) | Active-low write-inhibit signals driven by MASTER device; must be pulled high if unused |
| VCC / GND | Power supply terminals | Multiple VCC/GND pins ensure stable decoupling across high-speed operation |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only BUSY input interface | Eliminates need for external arbitration logic when expanding data bus width beyond 8 bits using IDT71321 MASTER |
| 2V data retention mode | Enables seamless battery-backed operation without auxiliary power management circuitry |
| Dual-mailbox interrupt architecture | Hardware-accelerated interprocessor signaling via dedicated 7FEH/7FFH addresses reduces software polling overhead |
| Asynchronous dual-port operation | Enables concurrent read/write access from independent processors or DMA engines without clock domain synchronization |
| Industrial-grade 25 ns timing | Guarantees deterministic latency in real-time control loops and safety-critical subsystems |
Applications
| Industrial PLC Backplane Memory | Avionics Data Concentrator Buffer |
|---|---|
Use Scenario: Dual-CPU redundancy module where primary and backup controllers share status registers and command queues via shared memory. IC Role / Device Role / Timing Role: SLAVE dual-port SRAM providing deterministic, hardware-arbitrated write access to prevent simultaneous overwrites during failover transitions. Use Value: BUSY input ensures atomic updates to critical control registers; 25 ns access enables sub-millisecond response in closed-loop servo control. |
Use Scenario: ARINC 429/664 interface unit aggregating sensor telemetry from multiple line-replaceable units (LRUs) into a unified data stream. IC Role / Device Role / Timing Role: High-speed buffer between flight management system (FMS) and sensor acquisition FPGA, using interrupts for packet-ready notification. Use Value: 7FEH/7FFH mailbox interrupts eliminate polling latency; 2V retention preserves last-known-good state during brownout events. |
| Medical Imaging Real-Time FIFO | Automotive ADAS Sensor Fusion Hub |
Use Scenario: Ultrasound beamformer subsystem requiring synchronized transfer of raw echo data between acquisition ASIC and DSP engine. IC Role / Device Role / Timing Role: Asynchronous dual-port memory acting as zero-latency FIFO, with left port fed by ADC pipeline and right port drained by FFT processor. Use Value: Full 2K depth supports multi-frame buffering; 25 ns access sustains >40 MB/s sustained throughput without wait states. |
Use Scenario: Central domain controller fusing radar, camera, and ultrasonic inputs for autonomous emergency braking (AEB) decision logic. IC Role / Device Role / Timing Role: Shared memory node enabling lock-free data exchange between perception and planning ECUs via hardware arbitration. Use Value: SLAVE configuration simplifies PCB layout in multi-master topology; industrial temp rating ensures reliability under hood-mounted deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Cypress CY7C024AV-25AXC | 5 V, 2K × 16 organization; integrated BUSY arbitration; no battery retention | Requires redesign for 8-bit data path; eliminates need for MASTER/SLAVE pairing | Choose when wider bus width and self-contained arbitration outweigh retention needs |
| ISSI IS61WV20488BLL-25MLI | Single-port, 2K × 8; 25 ns, 3.3 V core; no BUSY/interrupt logic | Lacks hardware interprocessor coordination; requires software-managed semaphores | Choose only for cost-sensitive, non-real-time applications where arbitration is handled in firmware |
Compared with IDT71421LA25PF8, CY7C024AV-25AXC offers native 16-bit width and internal arbitration but sacrifices 2V retention and requires voltage translation; IS61WV20488BLL-25MLI reduces cost and complexity but removes deterministic hardware arbitration essential for hard real-time interprocessor communication.
Availability
IDT71421LA25PF8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, avionics data concentrators, medical imaging FIFOs, automotive ADAS hubs, and real-time interprocessor communication systems requiring stable component supply across extended product lifecycles.
Supply support for IDT71421LA25PF8 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.
IDT71421LA25PF8 belongs to the IDT71321/71421 dual-port SRAM family, engineered specifically for deterministic, low-latency interprocessor communication in safety-critical and real-time embedded systems.
FAQ
What is the role of IDT71421LA25PF8 in a MASTER/SLAVE dual-port SRAM configuration?
IDT71421LA25PF8 functions exclusively as a SLAVE device: its BUSYL and BUSYR pins are inputs that accept write-inhibit signals from an IDT71321 MASTER. It contains no internal arbitration logic and relies entirely on the MASTER for BUSY-driven contention resolution. This architecture enables scalable 16-bit-or-wider memory expansion without external glue logic.
Does IDT71421LA25PF8 support battery backup operation, and what voltage is required?
Yes, IDT71421LA25PF8 supports battery backup operation with guaranteed data retention at VCC = 2.0 V (min), as specified in the LA version's data retention characteristics. This allows direct connection to a 2 V coin cell or backup rail without regulation, sustaining memory contents during main power loss.
How are interrupts generated and cleared in IDT71421LA25PF8?
Interrupts in IDT71421LA25PF8 are hardware-triggered: writing to address 7FEH asserts INTL, and writing to 7FFH asserts INTR. Clearing requires reading the same address with OE active (e.g., CEL = OEL = VIL for INTL). Timing is guaranteed at ≤25 ns (tINS/tINR), enabling fast interprocessor signaling.
What package type and pin count does IDT71421LA25PF8 use?
IDT71421LA25PF8 uses a 64-pin TQFP package (PNG64), measuring 14 mm × 14 mm × 1.4 mm. Pin assignments match the official IDT pinout diagram for 64-pin TQFP/STQFP variants, including dedicated VCC/GND pairs for noise immunity and open-drain INTL/INTR outputs requiring external pull-ups.
Can IDT71421LA25PF8 operate independently without an IDT71321 MASTER device?
IDT71421LA25PF8 can operate as a standalone dual-port SRAM for non-contention scenarios (e.g., isolated read/write per port), but its BUSY input pins must be held high (via pull-up resistors) since no internal arbitration exists. For any shared-address access requiring hardware write inhibition, an IDT71321 MASTER is mandatory.
71421LA25PF8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 16Kbit
- Memory Organization:
- 2K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 25ns
- Access Time:
- 25 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)
71421LA25PF8 FAQ
1.How can I place an order for 71421LA25PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71421LA25PF8 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 71421LA25PF8 reliable?
The price and inventory of 71421LA25PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71421LA25PF8 is usually 5 days.
3.What payment methods are accepted for 71421LA25PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71421LA25PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71421LA25PF8?
71421LA25PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71421LA25PF8 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 71421LA25PF8?
For technical support, including 71421LA25PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71421LA25PF8 requirements.
6.How does Aetrix verify that 71421LA25PF8 is sourced from the original manufacturer or authorized distributors?
All 71421LA25PF8 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 71421LA25PF8 meets industry standards.
7.What is the process for return or replacement of 71421LA25PF8?
All 71421LA25PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 71421LA25PF8, 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 71421LA25PF8 part is unused and in its original packaging.
Return procedure for 71421LA25PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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