Renesas 71V30S55TFG

Overview

71V30S55TFG from Renesas Electronics (formerly IDT) is a high-speed, 3.3V, 1K × 8 dual-port static RAM with independent left/right ports, on-chip arbitration logic, interrupt flags, and TTL-compatible I/O. It delivers 55 ns maximum read/write cycle time, 375 mW typical active power, and operates across commercial temperature range (0°C to +70°C). It is used in real-time inter-processor communication systems requiring concurrent memory access without software coordination.

For engineers reviewing the 71V30S55TFG datasheet, 71V30S55TFG pinout, 71V30S55TFG application, or 71V30S55TFG equivalent, key selection considerations include dual-port arbitration timing (tAPS = 5 ns), BUSY signal behavior during address contention, interrupt mailbox addressing (0x3FE/0x3FF), and STQFP-64 package compatibility with legacy 71V30-series layouts.

Technical Context

The 71V30S55TFG implements fully asynchronous dual-port operation: each port has dedicated CE, R/W, OE, address (A0–A9), and bidirectional I/O (I/O0–I/O7) lines, enabling simultaneous read/write access to any memory location. Its arbitration logic uses address-match detection and tAPS setup timing to assert BUSYL/BUSYR outputs, preventing conflicting writes.

Interrupt functionality relies on two dedicated SRAM addresses-0x3FE for left-port INTL assertion (triggered by right-port write) and 0x3FF for right-port INTR assertion (triggered by left-port write)-with reset performed by reading those same locations. Both BUSY and INT outputs use non-tristatable push-pull drivers.

Key Specifications

Pinout & Package

71V30S55TFG is housed in a 64-pin STQFP (PPG64) package measuring approximately 10 mm × 10 mm × 1.4 mm. All VCC and GND pins must be connected per datasheet note requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 71V30S55TFG, the 71V30S35TFGI offers faster timing and wider temperature tolerance at higher cost, while the 71V30L55TFG trades active power efficiency for significantly lower standby current and data retention capability - neither is pin-compatible with 71V30S55TFG due to differing power delivery and thermal design requirements.

Availability

71V30S55TFG is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffers, and industrial PLC data exchange requiring stable component supply across commercial temperature environments.

Supply support for 71V30S55TFG 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, and infrastructure markets.

The 71V30S series was originally developed by IDT and acquired by Renesas to serve high-reliability embedded systems requiring deterministic dual-port memory access without software arbitration overhead.

FAQ

What is the maximum operating temperature range for the 71V30S55TFG?

The 71V30S55TFG is rated for commercial temperature operation only: 0°C to +70°C. Unlike the 35 ns variants, no industrial-grade version exists for the 55 ns speed grade. This limitation is explicitly stated in the ordering information table and confirmed in the datasheet revision history dated July 2015, which removed industrial 55 ns offerings. Thermal derating is not supported beyond this range.

Does the 71V30S55TFG support battery backup operation?

No, the 71V30S55TFG does not support battery backup. Only the 'L' (low-power) variants - such as 71V30L55TFG - provide 2 V data retention capability. The 'S' suffix denotes standard power operation with no data retention below 3.0 V. This distinction is defined in the features section and reinforced in the data retention characteristics table, which applies exclusively to 'L' versions.

How does BUSY arbitration work on the 71V30S55TFG during simultaneous address access?

When both ports access the same address simultaneously, the 71V30S55TFG asserts BUSYL or BUSYR (but never both) based on tAPS arbitration priority setup time (5 ns minimum). The port meeting tAPS wins and proceeds; the losing port's write is gated internally. BUSY remains asserted until the winning port completes its cycle, with tBDD specifying disable-to-valid-data delay (≤45 ns for 55 ns grade). This behavior is detailed in Truth Table III and timing waveform Figure 10.

Can the interrupt flags (INTL/INTR) on the 71V30S55TFG be cleared by writing to the mailbox addresses?

No - interrupt flags on the 71V30S55TFG are cleared only by reading the corresponding mailbox address (0x3FE for INTL, 0x3FF for INTR), not by writing. Writing to those locations stores user-defined data but does not reset the flag. The datasheet Functional Description section explicitly states: "The left port clears the interrupt by accessing address location 3FE access with CER = OER = VIL, R/W is a 'don't care'." This read-only clear mechanism ensures reliable flag acknowledgment.

What package type and dimensions does the 71V30S55TFG use?

The 71V30S55TFG uses a 64-pin STQFP package designated PPG64, with physical dimensions of approximately 10 mm × 10 mm × 1.4 mm. Pin configuration matches the standard top-view layout shown in Figure 3 of the datasheet, including dedicated I/O, address, control, BUSY, and interrupt pins. Package body size and pin numbering are confirmed in the "Pin Configurations" section and ordering information table.