Renesas 71V424L12PHGI

Overview

71V424L12PHGI from Renesas Electronics is a 4-Mbit (512K × 8) low-power, high-speed CMOS static RAM operating from a single 3.3V supply, with 12ns access time, industrial temperature range (–40°C to +85°C), and JEDEC-compliant 44-pin TSOP package - deployed in real-time industrial controllers requiring deterministic memory access.

For engineers reviewing the 71V424L12PHGI datasheet, 71V424L12PHGI pinout, 71V424L12PHGI application, or 71V424L12PHGI equivalent, key selection criteria include its 12ns read cycle time, low standby current (45mA dynamic ISB, 10mA static ISB1), TTL-compatible bidirectional I/O, and dual control logic (CS + OE) for precise bus timing in legacy embedded systems.

Technical Context

The 71V424L12PHGI implements fully static asynchronous operation-no clocks or refresh required-and uses CMOS circuitry optimized for low power without sacrificing speed. Its architecture features independent chip select (CS) and output enable (OE) inputs, enabling flexible bus arbitration and partial-memory disable during multi-chip configurations.

It supports both CS-controlled and OE-controlled read/write cycles, with guaranteed tCLZ ≤ 4ns (CS to Low-Z) and tOHZ ≤ 6ns (CS deselect to High-Z), ensuring clean signal transitions in high-noise industrial backplanes. All address (A0–A18), data (I/O0–I/O7), and control pins are TTL-compatible at 3.3V.

Key Specifications

Pinout & Package

44-pin, 400 mil TSOP Type II (PHG44) package with JEDEC-standard center-power/ground pinout (VDD on pins 21 & 37, VSS on pins 20 & 36) to minimize switching noise and improve signal integrity in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed SRAM applications.

Compared with CY62148EV30LL-45ZAXI and AS6C4008-12TIN, the 71V424L12PHGI uniquely delivers 12ns performance *with* 10mA static standby current and full industrial temperature certification - making it the only option meeting simultaneous requirements for speed, ultra-low quiescent power, and extended thermal reliability.

Availability

71V424L12PHGI is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and avionics data logging requiring stable component supply across long production lifecycles.

Supply support for 71V424L12PHGI 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 delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT applications.

The 71V424L12PHGI belongs to Renesas' legacy high-speed SRAM product line, engineered specifically for deterministic, low-latency memory in resource-constrained industrial and aerospace systems where refresh-free operation and thermal resilience are critical.

FAQ

What is the maximum operating frequency supported by the 71V424L12PHGI?

The 71V424L12PHGI does not use a clock and operates asynchronously, so it has no maximum operating frequency specification. Instead, its timing is defined by access and cycle times: tRC = 12ns minimum read cycle time implies effective throughput up to ~83 MHz in burst-read scenarios. The 71V424L12PHGI achieves this without clocks or refresh, making it ideal for deterministic real-time systems where jitter must be eliminated.

Does the 71V424L12PHGI require external refresh circuitry?

No, the 71V424L12PHGI is a fully static RAM and requires no external refresh circuitry. Its CMOS latch-based memory cells retain data indefinitely as long as power is applied and CS remains asserted or deselected properly. This eliminates refresh overhead and timing uncertainty - a key advantage of the 71V424L12PHGI in safety-critical industrial and avionics applications.

Can the 71V424L12PHGI operate with a 2.5V supply?

No, the 71V424L12PHGI is specified only for 3.0V to 3.6V operation per its DC Electrical Characteristics table. Applying 2.5V violates the minimum VDD requirement and will result in undefined behavior, including data retention failure and timing violations. The 71V424L12PHGI must be powered from a regulated 3.3V source meeting ±10% tolerance.

What is the meaning of "L" in the part number 71V424L12PHGI?

The "L" in 71V424L12PHGI denotes the low-power variant of the IDT71V424 family. Compared to the "S" (standard power) version, the 71V424L12PHGI reduces dynamic ICC by up to 15mA and cuts static ISB1 current to 10mA - a 50% improvement over the S-grade counterpart. This distinction is confirmed in Table 8 of the Renesas datasheet and directly impacts thermal design and battery life in the 71V424L12PHGI's target applications.

Is the 71V424L12PHGI pin-compatible with the 71V424S12PHGI?

Yes, the 71V424L12PHGI and 71V424S12PHGI share identical pinout, package (PHG44), and functional interface - they differ only in power consumption specifications and internal biasing. Both support the same address/data/control signals, voltage levels, and timing waveforms. This allows direct substitution in existing designs where lower standby current is desired, without PCB or firmware changes - a verified drop-in replacement per Renesas ordering documentation.