Renesas 70V9279S9PRFI

Overview

70V9279S9PRFI from IDT (now Renesas) is a high-speed 32K × 16-bit synchronous dual-port SRAM with true dual-ported memory cells enabling simultaneous read/write access to the same address from left and right ports, 10 ns pipelined cycle time at 100 MHz, LVTTL-compatible 3.3 V ±0.3 V operation, and industrial temperature range (–40°C to +85°C). It serves as shared memory in real-time DSP co-processing, network packet buffering, and FPGA-to-ASIC interconnect systems.

For engineers reviewing the 70V9279S9PRFI datasheet, 70V9279S9PRFI pinout, 70V9279S9PRFI application, or 70V9279S9PRFI equivalent, key selection considerations include pipelined vs. flow-through output mode timing, port-to-port delay (tCWDD ≤ 35 ns), dual chip-enable depth expansion capability, counter-enabled burst addressing, and 128-pin TQFP package compatibility with legacy IDT dual-port RAM layouts.

Technical Context

This device implements fully synchronous dual-port architecture with independent clock, control, and data registers on both left and right ports-enabling 4 ns setup and 1 ns hold times for all inputs. Each port features separate upper-byte (UB/UBR) and lower-byte (LB/LBR) controls, ADS strobe enable, and dedicated counter logic (CNTEN/CNTRST) for auto-incrementing address generation without external logic.

The FT/PIPE pin selects between flow-through (tCD1 ≤ 20 ns) and pipelined (tCD2 ≤ 9 ns) output modes; in pipelined mode, CE0/CE1 become double-buffered (two-cycle deselect), while OE remains asynchronous. Power management includes four standby current modes (ISB1–ISB4), with full CMOS-level standby drawing only 0.4 mA typical.

Key Specifications

Pinout & Package

128-pin Thin Quad Flatpack (TQFP), body size 14 mm × 20 mm × 1.4 mm; requires connection of all VDD (pins 24, 25, 26, 49, 50, 70, 71, 90, 91, 102, 127) and VSS (pins 3, 23, 48, 72, 92, 101, 112, 128) pins to respective power/ground planes with local 0.1 µF decoupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and AS7C33256PFSIG, the 70V9279S9PRFI delivers superior bandwidth via 100 MHz pipelined operation, integrated address counter for burst transfers, and finer-grained power management-making it optimal for high-throughput, low-latency embedded systems requiring deterministic dual-port behavior.

Availability

70V9279S9PRFI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and FPGA-based embedded systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 70V9279S9PRFI 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 (formerly IDT) is a global semiconductor leader specializing in microcontrollers, analog, power management, and memory solutions for automotive, industrial, and communications markets.

The 70V9279S9PRFI belongs to IDT's high-speed synchronous dual-port SRAM product line, engineered for deterministic, low-latency shared memory in real-time co-processing architectures where simultaneous port access and precise timing control are critical.

FAQ

What is the maximum operating frequency of the 70V9279S9PRFI in pipelined mode?

The 70V9279S9PRFI supports up to 100 MHz operation in pipelined output mode, corresponding to a 10 ns clock cycle time (tCYC2). This is validated across the full industrial temperature range (–40°C to +85°C) with 3.3 V ±0.3 V supply. The device achieves this using internal pipelining that delivers data one clock cycle after address registration, enabling high-throughput burst transfers without external wait-state insertion.

Does the 70V9279S9PRFI support independent byte masking on each port?

Yes, the 70V9279S9PRFI provides separate upper-byte (UB/UBR) and lower-byte (LB/LBR) select signals for both left and right ports. These signals operate independently of the FT/PIPE mode setting and are single-buffered, allowing precise 8-bit granularity control over data writes-critical for interfacing with multiplexed buses or mixed-width peripherals without additional logic.

How does the address counter function in the 70V9279S9PRFI?

The 70V9279S9PRFI integrates a synchronous address counter per port, enabled by the CNTEN signal. When CNTEN = low on the rising edge of CLK, the internal address increments automatically-bypassing the external address bus. CNTRST = low resets the counter to address 0. This feature eliminates external counter ICs in applications like DMA block transfers or FIFO emulation, reducing BOM count and PCB area.

What power-saving modes does the 70V9279S9PRFI offer?

The 70V9279S9PRFI provides four distinct standby modes: ISB1 (both ports TTL-disabled, 65 mA max), ISB2 (one port active, 240 mA max), ISB3 (full CMOS standby, 0.4 mA typ), and ISB4 (one port CMOS-standby, 140 mA max). ISB3 is activated when both CE0 and CE1 inputs exceed VDD–0.2 V, making it ideal for deep-sleep states in battery-backed or energy-sensitive systems.

Is the 70V9279S9PRFI pin-compatible with other IDT dual-port SRAMs?

The 70V9279S9PRFI uses a standard 128-pin TQFP footprint consistent with IDT's 70V92xx family, including the 70V9269 and 70V9289. Pin functions (CLK, CE, R/W, I/O, UB/LB, ADS, CNTEN, CNTRST, FT/PIPE) are mapped identically across these variants. However, memory depth (32K vs. 16K) and speed grade (9 ns vs. 7.5 ns) differ-requiring design validation for timing-critical replacements.