Renesas 71V424S15PHGI8

Overview

71V424S15PHGI8 from Renesas Electronics is a 4-Mbit (512K × 8) high-speed CMOS static RAM with 15 ns read/write cycle time, single 3.3 V supply operation, and industrial temperature range (–40°C to +85°C). It features TTL-compatible bidirectional I/O, JEDEC-standard center-power/ground pinout for noise reduction, and low-power standby modes. It serves as main or buffer memory in real-time industrial controllers requiring deterministic access timing.

For engineers reviewing the 71V424S15PHGI8 datasheet, 71V424S15PHGI8 pinout, 71V424S15PHGI8 application, or 71V424S15PHGI8 equivalent, key selection criteria include its 15 ns AC timing compliance, TSOP-44 industrial-grade packaging, 3.3 V-only operation, and support for asynchronous burst-free memory interfacing without clocks or refresh.

Technical Context

The 71V424S15PHGI8 implements fully static asynchronous logic with no internal clocks or refresh circuitry. Its address decoding, I/O control, and output enable paths are optimized for sub-15 ns propagation - tAA ≤ 15 ns, tOE ≤ 7 ns, and tCHZ ≤ 7 ns - enabling direct connection to microcontroller or FPGA memory buses without wait states.

All control inputs (CS, OE, WE) and data I/Os operate at TTL voltage levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V) under 3.3 V ±10% supply. The device supports two distinct power states: dynamic operating current (ICC = 160 mA max at fMAX) and full static standby (ISB1 = 20 mA max), with chip deselect triggering automatic low-power entry.

Key Specifications

Pinout & Package

71V424S15PHGI8 is housed in a 44-pin, 400 mil TSOP Type II (PHG44) package with standard JEDEC pinout. Pin 1 is located at the top-left corner when the marking side faces up and the notch is oriented left.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY62148EV30LL-45ZSXIT and AS6C4008-15TIN, the 71V424S15PHGI8 uniquely delivers 15 ns performance in an industrial-qualified TSOP-44 package with JEDEC-compliant noise-reduction pinout - making it the only option among the three that satisfies both timing and ruggedness requirements for embedded control systems.

Availability

71V424S15PHGI8 is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and avionics applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 71V424S15PHGI8 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 microcontrollers, analog, power, and memory solutions for automotive, industrial, infrastructure, and IoT markets.

The 71V424S15PHGI8 belongs to Renesas' legacy high-speed SRAM product line, designed specifically for deterministic, low-latency memory interfacing in real-time embedded systems where clockless operation and industrial reliability are mandatory.

FAQ

What is the maximum operating frequency supported by the 71V424S15PHGI8?

The 71V424S15PHGI8 does not use a clock and therefore has no maximum operating frequency specification. Its performance is defined by timing parameters: tRC = 15 ns minimum cycle time supports up to 66.7 MHz effective bus throughput when interfaced with controllers capable of meeting setup/hold windows. Actual achievable bandwidth depends on host interface timing margins and bus protocol overhead.

Does the 71V424S15PHGI8 require external refresh circuitry?

No, the 71V424S15PHGI8 is a fully static RAM and requires no refresh cycles or external refresh circuitry. Its CMOS latch-based memory cells retain data indefinitely as long as VDD is maintained within specification and ambient temperature remains within –40°C to +85°C. This eliminates complexity in FPGA- or microcontroller-based memory controllers.

Can the 71V424S15PHGI8 be used with a 5 V microcontroller interface?

No, the 71V424S15PHGI8 is strictly a 3.3 V device with VIH(max) = VDD + 0.3 V and absolute maximum VIN = VDD + 0.5 V. Direct connection to 5 V logic violates absolute maximum ratings and risks permanent damage. Level translation (e.g., TXB0108 or discrete MOSFET buffers) is mandatory for 5 V host interfaces.

What is the meaning of "PHGI8" in the part number 71V424S15PHGI8?

In 71V424S15PHGI8, "PHG" denotes 44-pin TSOP Type II package (PHG44), "I" indicates industrial temperature grade (–40°C to +85°C), and "8" specifies tape-and-reel packaging. The "S" identifies the standard power variant (vs. "L" for low power), and "15" specifies 15 ns speed grade. This full suffix confirms the device's industrial qualification and ready-to-place packaging format.

How does the 71V424S15PHGI8 handle bus contention during write operations?

The 71V424S15PHGI8 avoids bus contention through strict control of I/O driver states: during write (CS = L, WE = L, OE = H), I/O pins become inputs; during read (CS = L, OE = L, WE = H), they become outputs; and when deselected (CS = H), all I/Os enter high-impedance state regardless of OE/WE. This three-state behavior is hardware-enforced and requires no external bus transceivers.