Renesas IDT71V416VS15YG

Overview

IDT71V416VS from Integrated Device Technology is a 4-Mbit (256K × 16) high-speed CMOS static RAM with 10 ns access time, single 3.3 V supply operation, and JEDEC-standard center power/ground pinout for noise reduction. It supports byte-wide and word-wide read/write via independent BHE/BLE controls and operates across commercial temperature range (0°C to +70°C) in 44-pin SOJ package.

For engineers reviewing the IDT71V416VS datasheet, IDT71V416VS pinout, IDT71V416VS application, or IDT71V416VS equivalent, key selection criteria include its 10 ns read cycle time, LVTTL-compatible bidirectional I/Os, low-power standby current (max 70 mA), and support for asynchronous memory interfacing in embedded controllers and networking datapaths.

Technical Context

The IDT71V416VS implements fully static asynchronous circuitry-no clocks or refresh required-and uses dual-byte enable (BHE/BLE) to gate high- and low-byte data paths independently. Its address decoding covers A0–A17 (18-bit addressing), supporting 256K-word depth with 16-bit data width.

Timing is controlled by three independent enables: Chip Select (CS), Output Enable (OE), and Write Enable (WE), each with defined setup/hold and transition-to-valid delays. All inputs and outputs are LVTTL-compatible, with VIH min = 2.0 V and VOL max = 0.4 V at 8 mA sink, ensuring interoperability with 3.3 V logic families.

Key Specifications

Pinout & Package

Package: 44-pin, 400-mil plastic SOJ (SO44-1), JEDEC-standard center power/ground layout (VDD/VSS on pins 12 & 33, respectively) for reduced simultaneous switching noise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY62148EV30LL-10ZSXI and AS6C4008-10TIN, the IDT71V416VS delivers native byte-enable control in a proven SOJ package with lower dynamic standby current, making it optimal for cost-sensitive, high-reliability embedded systems requiring flexible memory access granularity.

Availability

IDT71V416VS is available at Aetrix Electronics and suitable for network packet buffering, industrial PLC data logging, and medical imaging frame storage requiring stable component supply and long-term obsolescence management.

Supply support for IDT71V416VS 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 power management ICs for communications, computing, and industrial markets.

The IDT71V416VS belongs to IDT's legacy high-speed parallel SRAM product line, designed specifically for low-latency, deterministic memory interfacing in embedded controllers, telecom infrastructure, and real-time data acquisition systems.

FAQ

What is the maximum operating frequency supported by the IDT71V416VS?

The IDT71V416VS does not operate on a clock; it is an asynchronous SRAM. Its performance is specified by timing parameters-not frequency. The 10 ns access time (tAA) and 10 ns read cycle time (tRC) allow reliable interfacing with microprocessors or FPGAs running bus clocks up to 100 MHz in zero-wait-state configurations. Actual maximum usable bus rate depends on controller timing margins and PCB layout.

Does the IDT71V416VS require a refresh circuit or periodic memory maintenance?

No, the IDT71V416VS is a fully static RAM and requires no refresh cycles, clocks, or periodic maintenance. Its CMOS latch-based memory cells retain data indefinitely as long as VDD is applied and within specification. This makes the IDT71V416VS ideal for deterministic real-time systems where refresh-induced latency or jitter is unacceptable.

Can the IDT71V416VS be used with 5 V logic interfaces?

No, the IDT71V416VS is strictly a 3.3 V LVTTL device. Its absolute maximum input voltage is VDD + 0.5 V (≤4.1 V), and VIH min is 2.0 V-compatible only with 3.3 V logic families. Direct connection to 5 V systems risks damage and violates DC operating conditions. Level translation (e.g., TXB0108) is required for 5 V host interfaces.

What is the function of pin 28 on the IDT71V416VS SOJ package?

Pin 28 on the IDT71V416VS in the 44-pin SOJ package is designated NC* (No Connect), meaning it has no internal connection and must remain unconnected. The datasheet explicitly states "Pin 28 can either be a NC or connected to Vss"-but connecting it to VSS is optional and offers no functional benefit. Standard practice is to leave it floating or tie it to ground only if required for mechanical stability or EMI mitigation per board-level design rules.

How does the byte-enable feature (BHE/BLE) improve system efficiency in the IDT71V416VS?

The BHE and BLE pins in the IDT71V416VS enable independent 8-bit writes to high and low bytes without reading-modify-writing the full 16-bit word. This reduces bus traffic, eliminates race conditions in multi-master systems, and accelerates buffer management in UART, SPI, or DMA peripherals. For example, writing a single status byte to I/O0–I/O7 while preserving I/O8–I/O15 contents takes one cycle instead of three-directly improving throughput in IDT71V416VS-based designs.