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Renesas 71421LA20PFG8
- Part No.:
- 71421LA20PFG8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71421LA20PFG8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,291
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Product details
Overview
IDT71421LA20PFG8 from Integrated Device Technology is a 2K × 8 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting fully asynchronous left/right port access with 20 ns read cycle time (max), 2V battery-backed data retention, and TTL-compatible 5V ±10% operation for industrial embedded interprocessor communication.
For engineers reviewing the IDT71421LA20PFG8 datasheet, IDT71421LA20PFG8 pinout, IDT71421LA20PFG8 application, or IDT71421LA20PFG8 equivalent, key selection criteria include BUSY input timing (tWB = 0 ns), interrupt flag behavior (INTL/INTR set/reset via address 7FEh/7FFh), low-power standby current (ISB3 = 0.2 mA typ.), and 64-pin TQFP package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The IDT71421LA20PFG8 operates exclusively as a SLAVE in MASTER/SLAVE dual-port configurations, where BUSY is an input (not output) used to inhibit writes during contention-unlike the MASTER IDT71321 which generates BUSY. It supports independent R/W-controlled or CE-controlled write cycles with tWP = 15 ns (min) and tWC = 20 ns (min).
Interrupt logic uses dedicated mailbox addresses: writing to 7FEh sets INTL, reading from 7FEh clears it; writing to 7FFh sets INTR, reading from 7FFh clears it. All I/O pins are TTL-compatible, and power-down is controlled per-port via CE, enabling ISB3 = 0.2 mA (typ.) at full CMOS-level standby.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 8 bits (2048 words × 8-bit wide), usable as 16-bit or wider arrays when paired with IDT71321 MASTER |
| Access Time | tRC = 20 ns (max), enabling high-speed interprocessor handshaking in real-time control loops |
| Supply Voltage | 5.0 V ±10%, compatible with legacy 5V TTL bus systems without level translation |
| Data Retention | 2.0 V minimum VCC, supporting battery backup with ICCDR ≤ 100 µA (typ.) for long-term nonvolatile storage |
| Operating Temp | –40°C to +85°C industrial grade, qualified for automotive engine control units and industrial PLCs |
| Standby Current | ISB3 = 0.2 mA (typ.) with both ports in full CMOS-level standby-critical for low-power remote sensor nodes |
| Interrupt Latency | tINS = 20 ns (max), ensuring sub-25 ns response to mailbox writes for deterministic real-time messaging |
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 access; must match A0R–A10R in MASTER/SLAVE width expansion |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit TTL-compatible data path; high-impedance when OEL = VIH or CEL = VIH |
| CEL, OEL, R/WL | Left port controls | Chip enable, output enable, and read/write direction-fully asynchronous with right port |
| A0R–A10R | Right port address inputs | Independent 11-bit address space; enables true dual-access concurrency |
| I/O0R–I/O7R | Right port bidirectional data | Separate 8-bit data bus; no arbitration overhead between ports |
| CER, OER, R/WR | Right port controls | Independent control logic-no shared timing constraints with left port |
| BUSYL, BUSYR | BUSY inputs (SLAVE mode) | Active-low write-inhibit signals from MASTER; require external pull-up for open-drain compatibility |
| INTL, INTR | Interrupt flags | Open-drain outputs asserting on mailbox writes (7FEh/7FFh); need 270 Ω pull-up per datasheet |
| VCC, GND | Power supply | All VCC pins must be connected; all GND pins tied to common ground plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only BUSY input interface | Eliminates need for external arbitration logic when expanding memory width beyond 8 bits |
| Dual-mailbox interrupt architecture | Enables lock-free interprocessor messaging using dedicated 7FEh/7FFh SRAM locations |
| 2V data retention | Supports battery-backed operation in power-fail scenarios without external backup circuitry |
| Per-port CE-controlled power-down | Reduces system power by disabling unused port circuitry-ISB2 = 60 mA (typ.) with one port active |
| TTL-compatible I/O | Direct interfacing with legacy microcontrollers and FPGAs without level-shifting components |
Applications
| Industrial Motion Controller | Automotive Engine Control Unit |
|---|---|
Use Scenario: Real-time coordination between motion trajectory processor and servo driver IC via shared memory. IC Role / Device Role / Timing Role: SLAVE dual-port RAM stores command buffers and status registers accessible concurrently by two processors. Use Value: 20 ns tRC and BUSY-driven write inhibition prevent race conditions during simultaneous read/write to same address. | Use Scenario: Fault-tolerant communication between main ECU and safety monitor core during ignition sequence. IC Role / Device Role / Timing Role: Acts as mailbox memory with interrupt flags signaling critical event updates (e.g., knock detection). Use Value: 2V data retention preserves fault logs across battery disconnects; tINS = 20 ns ensures timely alert delivery. |
| Avionics Data Concentrator | Medical Imaging Subsystem |
Use Scenario: High-integrity data aggregation from multiple sensor ADCs into a central DSP pipeline. IC Role / Device Role / Timing Role: SLAVE device in multi-chip 16-bit-wide memory array synchronized by MASTER IDT71321. Use Value: No external AND gates needed for BUSY propagation-reduces BOM count and improves FIT rate. | Use Scenario: Frame buffer sharing between image acquisition FPGA and display controller ASIC. IC Role / Device Role / Timing Role: Dual-port interface enables concurrent pixel write (FPGA) and pixel read (ASIC) without FIFO latency. Use Value: Asynchronous operation eliminates clock domain crossing logic; ISB3 = 0.2 mA extends battery life in portable scanners. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1371BV25-200BZC | 3.3V core, 16K × 16 organization, no built-in BUSY arbitration logic | Requires external glue logic for width expansion; incompatible with 5V TTL buses | Select only if migrating to 3.3V system architecture and adding custom arbitration |
| IDT71321LA20PFG8 | MASTER variant with on-chip arbitration logic and BUSY output; identical pinout and timing | Used as controlling unit in same MASTER/SLAVE topology-cannot substitute directly as SLAVE | Required when building scalable dual-port arrays; pairs functionally with IDT71421LA20PFG8 |
Compared with CY7C1371BV25-200BZC, IDT71421LA20PFG8 delivers native 5V TTL compatibility and hardware BUSY-based write inhibition, reducing design complexity in industrial control. Versus IDT71321LA20PFG8, it serves strictly as SLAVE-requiring the MASTER for full arbitration functionality.
Availability
IDT71421LA20PFG8 is available at Aetrix Electronics and suitable for industrial motion controllers, automotive engine control units, avionics data concentrators, and medical imaging subsystems requiring stable component supply across extended product lifecycles.
Supply support for IDT71421LA20PFG8 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.
IDT71421LA20PFG8 belongs to the IDT71321/71421 dual-port SRAM family, engineered specifically for deterministic interprocessor communication in real-time embedded systems requiring hardware-enforced memory coherency.
FAQ
What is the role of IDT71421LA20PFG8 in a MASTER/SLAVE dual-port configuration?
IDT71421LA20PFG8 functions exclusively as a SLAVE device: its BUSYL and BUSYR pins are inputs that receive write-inhibit signals from a MASTER IDT71321. It does not generate BUSY signals. This architecture enables seamless 16-bit-or-wider memory expansion without external arbitration logic, as the MASTER handles contention resolution and propagates BUSY to all SLAVES.
Does IDT71421LA20PFG8 support battery backup, and what is the minimum retention voltage?
Yes, IDT71421LA20PFG8 supports battery backup with guaranteed data retention down to VCC = 2.0 V. At this voltage, typical data retention current is 100 µA (max 1500 µA), allowing years of storage on a small coin cell. This feature is exclusive to LA versions-SA variants do not support sub-4.5V operation.
How are interrupts generated and cleared on IDT71421LA20PFG8?
Interrupts are generated by writes to dedicated mailbox addresses: writing to 7FEh asserts INTL, writing to 7FFh asserts INTR. Clearing requires a read access to the same address with OE and CE asserted (e.g., CEL = OEL = VIL for INTL). The interrupt flags are open-drain and require 270 Ω pull-up resistors per the datasheet.
What is the maximum operating temperature range for IDT71421LA20PFG8?
IDT71421LA20PFG8 is rated for industrial temperature operation from –40°C to +85°C. This rating applies to all speed grades (20/25/35/55 ns) and package variants (TQFP, STQFP, PLCC), making it suitable for under-hood automotive, factory automation, and outdoor infrastructure applications.
Can IDT71421LA20PFG8 operate with a 3.3V supply?
No, IDT71421LA20PFG8 requires a 5.0 V ±10% supply (4.5 V to 5.5 V) and is TTL-compatible. It is not 3.3V tolerant-applying 3.3V to VCC will result in undefined operation and potential data corruption. For 3.3V systems, consider Renesas' newer dual-port SRAM families like the 72V2221 series.
71421LA20PFG8 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:
- 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:
- 64-TQFP (14x14)
71421LA20PFG8 FAQ
1.How can I place an order for 71421LA20PFG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71421LA20PFG8 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 71421LA20PFG8 reliable?
The price and inventory of 71421LA20PFG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71421LA20PFG8 is usually 5 days.
3.What payment methods are accepted for 71421LA20PFG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71421LA20PFG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71421LA20PFG8?
71421LA20PFG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71421LA20PFG8 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 71421LA20PFG8?
For technical support, including 71421LA20PFG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71421LA20PFG8 requirements.
6.How does Aetrix verify that 71421LA20PFG8 is sourced from the original manufacturer or authorized distributors?
All 71421LA20PFG8 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 71421LA20PFG8 meets industry standards.
7.What is the process for return or replacement of 71421LA20PFG8?
All 71421LA20PFG8 units undergo pre-shipment inspection (PSI). If there is an issue with 71421LA20PFG8, 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 71421LA20PFG8 part is unused and in its original packaging.
Return procedure for 71421LA20PFG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71421LA20PFG8 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
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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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