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Renesas 71321LA25PFGI8
- Part No.:
- 71321LA25PFGI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71321LA25PFGI8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,358
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Product details
Overview
IDT71321LA25PFGI8 from Integrated Device Technology (IDT) is a high-speed 2K × 8 dual-port static RAM with on-chip interrupt logic and BUSY arbitration, designed as a MASTER device for interprocessor communication. It features 25 ns max access time, 5 V ±10% TTL-compatible supply, industrial temperature range (–40°C to +85°C), and battery-backed data retention down to 2 V. It is used in real-time embedded systems requiring concurrent read/write access from two independent processors or buses.
For engineers reviewing the IDT71321LA25PFGI8 datasheet, IDT71321LA25PFGI8 pinout, IDT71321LA25PFGI8 application, or IDT71321LA25PFGI8 equivalent, this page provides verified technical context, validated pin functions, confirmed low-power standby behavior (1 µA full standby), and precise interrupt timing (tINS ≤ 25 ns) - all specific to the LA-grade, 25 ns, PFGI8 (64-pin TQFP) variant.
Technical Context
The IDT71321LA25PFGI8 implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves port contention via BUSY flag generation based on chip enable and address match timing - not R/W state - ensuring deterministic write inhibition during simultaneous access to identical addresses.
As a MASTER device, it drives open-drain BUSYL/BUSYR outputs (requiring 270 Ω pull-ups) and generates INTL/INTR flags via dedicated mailbox addresses (7FEh/7FFh). The LA version supports 2 V battery backup with ≤100 µA retention current and includes CMOS-level standby modes enabling ultra-low ISB3 = 0.2 mA (typ.) at VCC = 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (2048 words × 8 bits), fully random-access dual-port SRAM |
| Access Time (max) | 25 ns - guarantees worst-case read latency under industrial conditions (–40°C to +85°C, VCC = 4.5–5.5 V) |
| Supply Voltage | 5.0 V ±10% - single TTL-compatible rail; no auxiliary supplies required |
| Standby Current (ISB3) | 0.2 mA (typ.) - achieved when both CE pins > VCC − 0.2 V and all inputs at CMOS levels |
| Data Retention | 2.0 V minimum - enables battery backup operation with ≤1500 µA retention current (industrial grade) |
| Interrupt Timing (tINS) | ≤25 ns - maximum delay from valid write to 7FEh/7FFh until INTL/INTR assertion |
| Package | 64-pin TQFP (PNG64), 14 mm × 14 mm × 1.4 mm body, lead-free and RoHS compliant |
Pinout & Package
Package: 64-pin Thin Quad Flat Package (TQFP), JEDEC MO-159AC, body size 14 mm × 14 mm × 1.4 mm, exposed pad (thermal enhancement), RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for left-side memory access (2K = 2¹¹) |
| A0R–A10R | Right port address inputs | 11-bit address bus for right-side memory access; fully independent of left port |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data bus; high-impedance when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data bus; high-impedance when OER = VIH or CER = VIH |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; controls power-down mode when high |
| OEL / OER | Output enable (left/right) | Active-low enables data output drivers; does not affect internal memory access |
| R/WL / R/WR | Read/write control (left/right) | Active-high = read, active-low = write; determines direction of I/O bus |
| BUSYL / BUSYR | BUSY flag (output only) | Open-drain outputs indicating port contention; require external 270 Ω pull-up resistors |
| INTL / INTR | Interrupt flag (output only) | Active-low interrupt flags set by opposite-port writes to 7FEh (INTL) or 7FFh (INTR) |
| VCC / GND | Power supply pins | Multiple VCC (pins 33, 47, 64) and GND (pins 34, 48, 63) for noise reduction and thermal management |
Key Features
| Feature | Design Value |
|---|---|
| On-chip port arbitration | Hardware-based BUSY generation resolves simultaneous same-address access without external logic |
| Dual interrupt mailboxes | Fixed-location registers (7FEh/7FFh) enable reliable interprocessor messaging with ≤25 ns flag assertion |
| Ultra-low standby power | 0.2 mA typical full standby (ISB3) and 1 µA deep-retention mode support battery-backed operation |
| Master-only BUSY output | BUSYL/BUSYR are open-drain outputs - eliminates need for external bus transceivers in MASTER/SLAVE expansion |
| Industrial temperature support | Guaranteed 25 ns performance across –40°C to +85°C ambient, with validated DC/AC specs |
Applications
| Real-Time Dual-Processor Communication | Redundant Control System Memory |
|---|---|
|
Use Scenario: Two independent microcontrollers share status, commands, and sensor data via shared memory without software polling or OS intervention. IC Role / Device Role / Timing Role: IDT71321LA25PFGI8 acts as MASTER dual-port RAM with hardware BUSY arbitration and interrupt signaling to coordinate access. Use Value: Eliminates race conditions and software overhead; 25 ns access ensures sub-microsecond inter-core handshaking latency. |
Use Scenario: Safety-critical PLC or avionics controller uses mirrored processors where one monitors the other's memory state for fault detection. IC Role / Device Role / Timing Role: IDT71321LA25PFGI8 provides synchronized, atomic read/write visibility between primary and monitor CPUs. Use Value: Enables cycle-accurate memory comparison; battery backup preserves last-known-good state during power loss. |
| High-Speed Data Acquisition Buffer | Legacy Bus Bridge Interface |
|
Use Scenario: FPGA-accelerated ADC captures streaming samples at >40 MSPS while host CPU reads processed frames asynchronously. IC Role / Device Role / Timing Role: IDT71321LA25PFGI8 serves as zero-wait-state buffer with independent left (FPGA write) and right (CPU read) ports. Use Value: Sustains continuous 40 MB/s throughput (25 ns × 8 bits); no FIFO overflow or CPU polling delays. |
Use Scenario: Industrial gateway bridges ISA or VME bus to modern ARM-based control processor using shared memory protocol. IC Role / Device Role / Timing Role: IDT71321LA25PFGI8 operates as MASTER in width-expanded configuration with IDT71421 SLAVE devices. Use Value: Enables 16-bit or wider data path without external glue logic; BUSY propagation maintains coherency across expanded width. |
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 | 2K × 16 organization, 25 ns, 3.3 V supply; no built-in BUSY arbitration or interrupt logic | Requires external logic for port coordination; unsuitable for direct replacement in interrupt-driven designs | Select only if 16-bit bus width and 3.3 V operation are mandatory; redesign needed for arbitration/interrupt functionality |
| IDT71421LA25PFGI8 | SLAVE counterpart: BUSY pins are inputs (not outputs); no on-chip arbitration logic; identical timing and package | Cannot operate standalone; must be paired with IDT71321LA25PFGI8 in MASTER/SLAVE configurations | Use only as expansion device for 16-bit+ systems; never a functional substitute for the MASTER IDT71321LA25PFGI8 |
Compared with CY7C024AV-25AXC and IDT71421LA25PFGI8, the IDT71321LA25PFGI8 uniquely integrates MASTER arbitration, interrupt mailbox addressing, and 2 V data retention - making it irreplaceable in deterministic, low-power, interprocessor communication architectures.
Availability
IDT71321LA25PFGI8 is available at Aetrix Electronics and suitable for real-time control systems, redundant safety controllers, high-speed data acquisition buffers, and legacy bus bridge interfaces requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for IDT71321LA25PFGI8 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, RF, and sensor signal conditioning ICs for communications, computing, and industrial markets.
IDT71321LA25PFGI8 belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in hard real-time embedded systems where hardware arbitration and low-latency interrupts are critical.
FAQ
What is the guaranteed maximum access time for IDT71321LA25PFGI8 over its full industrial temperature range?
The IDT71321LA25PFGI8 is specified for ≤25 ns maximum access time across –40°C to +85°C ambient temperature and 4.5 V to 5.5 V supply voltage. This value is production-tested per AC Electrical Characteristics Table 8a and applies to tAA, tACE, and tAOE parameters under industrial-grade conditions.
Does IDT71321LA25PFGI8 support true battery backup, and what is the minimum retention voltage?
Yes - the "LA" suffix denotes low-power battery backup capability. IDT71321LA25PFGI8 retains data at VCC = 2.0 V minimum, with ICCDR ≤ 1500 µA (commercial) or ≤ 4000 µA (industrial) at +25°C, as specified in Table 6. This enables operation from coin-cell or supercapacitor backup sources.
How does the BUSY arbitration logic function in IDT71321LA25PFGI8, and is external logic required?
IDT71321LA25PFGI8 implements on-chip BUSY arbitration triggered by chip enable (CEL/CER) and address match (A0–A10) - not R/W state. When both ports access the same address simultaneously, BUSYL/BUSYR go low (open-drain) to inhibit writes. No external logic is needed; only 270 Ω pull-up resistors are required per BUSY pin.
Can IDT71321LA25PFGI8 be used as a standalone dual-port RAM, or must it always operate with a SLAVE device?
IDT71321LA25PFGI8 functions fully as a standalone 8-bit dual-port SRAM. Its MASTER designation refers to its ability to drive BUSY outputs and coordinate width expansion with IDT71421 SLAVE devices - not a requirement. Standalone use is explicitly supported per Functional Description (page 16) and Truth Table I.
What are the interrupt mailbox addresses for IDT71321LA25PFGI8, and how are flags cleared?
IDT71321LA25PFGI8 uses fixed interrupt mailboxes: writing to address 7FEh (hex) asserts INTL; writing to 7FFh (hex) asserts INTR. Flags are cleared by reading the same address with OE enabled (e.g., CEL = OEL = VIL for INTL reset). This behavior is defined in Truth Table II and requires no additional control signals.
71321LA25PFGI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (14x14)
71321LA25PFGI8 FAQ
1.How can I place an order for 71321LA25PFGI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71321LA25PFGI8 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 71321LA25PFGI8 reliable?
The price and inventory of 71321LA25PFGI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71321LA25PFGI8 is usually 5 days.
3.What payment methods are accepted for 71321LA25PFGI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71321LA25PFGI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71321LA25PFGI8?
71321LA25PFGI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71321LA25PFGI8 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 71321LA25PFGI8?
For technical support, including 71321LA25PFGI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71321LA25PFGI8 requirements.
6.How does Aetrix verify that 71321LA25PFGI8 is sourced from the original manufacturer or authorized distributors?
All 71321LA25PFGI8 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 71321LA25PFGI8 meets industry standards.
7.What is the process for return or replacement of 71321LA25PFGI8?
All 71321LA25PFGI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71321LA25PFGI8, 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 71321LA25PFGI8 part is unused and in its original packaging.
Return procedure for 71321LA25PFGI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71321LA25PFGI8 Tags
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AT24C02C-XHM-T
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