Renesas 71V30L35TFGI

Overview

71V30L35TFGI from Renesas Electronics (formerly IDT) is a high-speed, low-power 1K × 8 dual-port static RAM with independent left/right ports, on-chip arbitration logic, interrupt flags, and battery-backed data retention down to 2V. It operates at 3.3V ±0.3V, supports industrial temperature range (−40°C to +85°C), and delivers 35ns max access time for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 71V30L35TFGI datasheet, 71V30L35TFGI pinout, 71V30L35TFGI application, or 71V30L35TFGI equivalent, key selection considerations include dual-port asynchronous read/write timing, BUSY/INT signal behavior under contention, 64-pin STQFP package compatibility, and low-power standby current (1 µA typical) for battery-critical designs.

Technical Context

The 71V30L35TFGI implements fully asynchronous dual-port operation: each port (left/right) has dedicated address (A0–A9), data (I/O0–I/O7), and control lines (CE, OE, R/W), enabling concurrent access without clock synchronization. Its arbitration logic resolves memory address contention via non-tristatable BUSY outputs that gate writes when both ports target the same location.

Interrupt functionality uses fixed mailbox addresses (3FE_H for INTL, 3FF_H for INTR) to signal cross-port write events; interrupt flags are cleared by reading the respective address with correct enable conditions. The device supports TTL-compatible inputs and CMOS-level outputs, with data retention at 2V for backup power scenarios.

Key Specifications

Pinout & Package

64-pin STQFP (PPG64) package with exposed thermal pad; body dimensions 10 mm × 10 mm × 1.4 mm. Pin 1 marked by corner notch; pins arranged in 8×8 grid with 0.5 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Compared with CY7C024AV-35AXC and AS7C31025B-35TIN, the 71V30L35TFGI uniquely combines industrial-grade dual-port timing, hardware arbitration, interrupt signaling, and 2V data retention in a compact 64-pin STQFP - making it irreplaceable for safety-critical or battery-backed inter-processor communication.

Availability

71V30L35TFGI is available at Aetrix Electronics and suitable for motor control co-processor interfaces, real-time data logging buffers, and redundant safety controller memory requiring stable component supply across extended product lifecycles.

Supply support for 71V30L35TFGI 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

Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The 71V30L35TFGI belongs to Renesas' legacy dual-port SRAM product line, originally developed by IDT to address deterministic inter-processor communication in real-time embedded systems with strict power and timing constraints.

FAQ

What is the guaranteed maximum access time for the 71V30L35TFGI?

The 71V30L35TFGI guarantees a maximum access time of 35 ns across the full industrial temperature range (−40°C to +85°C) and supply voltage (3.0 V to 3.6 V). This value applies to both read and write cycles and is verified per AC Electrical Characteristics Table 9 in the official datasheet. The 71V30L35TFGI achieves this performance using high-speed CMOS process technology while maintaining low power consumption.

Does the 71V30L35TFGI support true dual-port operation without external arbitration logic?

Yes, the 71V30L35TFGI integrates on-chip arbitration logic that automatically resolves contention when both ports access the same memory address simultaneously. It asserts BUSYL or BUSYR to stall the contending port, preventing data corruption. No external logic is needed - the 71V30L35TFGI handles arbitration entirely in hardware per Truth Table III and Functional Description section.

Can the 71V30L35TFGI retain data during main power loss?

Yes, the 71V30L35TFGI supports battery-backed data retention at 2 V minimum supply voltage, with typical retention current of 100 µA (industrial grade). This feature is exclusive to the "L" (low-power) variant and is specified in Data Retention Characteristics Table 7. The 71V30L35TFGI maintains stored data indefinitely as long as VCC remains ≥2.0 V, enabling reliable operation during brownouts or backup battery scenarios.

How are interrupt flags generated and cleared on the 71V30L35TFGI?

Interrupt flags on the 71V30L35TFGI are generated when one port writes to dedicated mailbox addresses: INTL asserts when the right port writes to 3FE_H, and INTR asserts when the left port writes to 3FF_H. Flags are cleared by reading those same addresses with correct enable conditions (e.g., CER=OER=VIL for INTL reset). This behavior is defined in Truth Table II and confirmed in the Functional Description section.

What is the significance of the "TFGI" suffix in the 71V30L35TFGI part number?

The "TFGI" suffix in 71V30L35TFGI decodes as: T = tape-and-reel packaging, F = 64-pin STQFP (PPG64), G = green (lead-free), I = industrial temperature grade (−40°C to +85°C). This matches the Ordering Information table on page 14 of the datasheet. The "L35" denotes low-power variant with 35 ns speed grade, confirming the 71V30L35TFGI is qualified for harsh industrial environments with stringent power budgets.