Renesas 709279L12PFGI

Overview

709279L12PFGI from IDT is a high-speed 32K × 16-bit synchronous dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address from left and right ports, 12ns max clock-to-data access in pipelined mode, industrial temperature range (–40°C to +85°C), and TTL-compatible 5V ±10% supply. It serves in real-time interprocessor communication and FPGA co-processor buffering.

For engineers reviewing the 709279L12PFGI datasheet, 709279L12PFGI pinout, 709279L12PFGI application, or 709279L12PFGI equivalent, this page delivers verified timing parameters, port-specific control logic, package-mapped pin functions, and validated alternatives for synchronous dual-port SRAM selection in deterministic embedded systems.

Technical Context

The 709279L12PFGI implements fully synchronous operation on both ports with 4ns setup and 1ns hold times on all inputs, using edge-triggered registers for address, data, and control signals. Its self-timed write architecture enables fast cycle time independent of clock low time.

It supports two output modes-flow-through (tCD1 = 25ns max) and pipelined (tCD2 = 12ns max)-selected per port via dedicated FT/PIPE pins. Dual chip enables (CE0/CE1 per port) allow depth expansion without external logic, while separate upper- and lower-byte controls (UB/LB) support multiplexed bus compatibility.

Key Specifications

Pinout & Package

100-pin Thin Quad Flatpack (TQFP), body size 14mm × 14mm × 1.4mm, lead finish Pb-free (Green part per ordering code G).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-12BGXI and IDT70V9279L12PFGI, the 709279L12PFGI uniquely supports 5V-only operation with integrated address counter and strobe-making it irreplaceable in legacy 5V deterministic control systems requiring autonomous address sequencing.

Availability

709279L12PFGI is available at Aetrix Electronics and suitable for real-time interprocessor communication, FPGA co-processor buffering, and digital signal processing applications requiring stable component supply across extended product lifecycles.

Supply support for 709279L12PFGI 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

IDT (Integrated Device Technology) is a fabless semiconductor company specializing in high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.

The IDT709279 family was designed specifically for deterministic, low-latency inter-processor and FPGA-ASIC bridging applications requiring true concurrent access, industrial temperature resilience, and synchronous timing control.

FAQ

What is the maximum operating frequency of the 709279L12PFGI in pipelined mode?

The 709279L12PFGI supports up to 50 MHz operation in pipelined output mode, derived from its 20ns maximum clock cycle time (tCYC2). This is confirmed in the AC Electrical Characteristics table (Table 11) for the X12 speed grade under industrial temperature conditions. The 709279L12PFGI achieves this with 6ns minimum clock high/low times, enabling robust timing margins in high-speed synchronous systems.

Does the 709279L12PFGI support independent address counters on each port?

Yes, the 709279L12PFGI provides fully independent address counters on left and right ports, controlled by dedicated CNTENL/CNTRSTL and CNTENR/CNTRSTR pins. Each counter advances on the rising edge of its port's clock when CNTENX = L, and resets to address 0 when CNTRSTX = L-enabling autonomous sequential access without external address generation logic.

What is the standby current consumption of the 709279L12PFGI?

The 709279L12PFGI (L = Low Power variant) consumes 1mW typical standby power, corresponding to approximately 0.2mA at 5V (ISB3 parameter, Table 9). This value is measured with both ports fully deselected (CE0/CE1 in high-impedance state) and CMOS-level inputs, making it suitable for battery-backed or energy-sensitive industrial monitoring nodes.

Can the 709279L12PFGI be used in a 3.3V system?

No-the 709279L12PFGI requires a 5.0V ±10% supply and is not 3.3V-compatible. For 3.3V designs, IDT offers the pin-compatible IDT70V9279L12PFGI (3.3V core, 5V-tolerant I/O), which shares identical timing, features, and package but uses a different power rail. Using 709279L12PFGI in a 3.3V system will result in functional failure.

How does the FT/PIPE pin affect timing behavior on the 709279L12PFGI?

The FT/PIPEL and FT/PIPER pins configure each port independently for flow-through (VIL) or pipelined (VIH) output mode. In pipelined mode, the 709279L12PFGI achieves 12ns max clock-to-data (tCD2) but adds one-cycle latency; in flow-through mode, tCD1 is 25ns max with zero-cycle latency. The mode selection is DC-stable and must be set before operation begins.