Renesas 709279L12PFI

Overview

709279L12PFI from Integrated Device Technology 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 maximum clock-to-data access in pipelined mode, industrial temperature range (–40°C to +85°C), and TTL-compatible 5V ±10% supply - used in real-time DSP co-processing and FPGA-based communication buffers.

For engineers reviewing the 709279L12PFI datasheet, 709279L12PFI pinout, 709279L12PFI application, or 709279L12PFI equivalent, key selection criteria include pipelined vs. flow-through output mode configuration via FT/PIPE pin, dual chip enable architecture for depth expansion, and separate upper/lower byte controls for multiplexed bus compatibility.

Technical Context

The 709279L12PFI implements fully synchronous operation on both ports with 4ns setup and 1ns hold times on all control, address, and data inputs, using input registers for minimal timing latitude. Its self-timed write mechanism enables fast cycle time independent of clock edge transitions.

It supports two configurable output modes: pipelined (9ns clock-to-data, 15ns cycle time, 67MHz max) and flow-through (12ns clock-to-data, 30ns cycle time), selected per port via dedicated FT/PIPE pins. Address counters are independently controlled per port with CNTEN/CNTRST signals and ADS strobe for external address loading.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), 14mm × 14mm × 1.4mm body, lead-free (Green) variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and IDT70V9279L15PF, the 709279L12PFI uniquely delivers industrial temperature support, 5V compatibility, and integrated address counters - making it the sole option for ruggedized, mixed-voltage, or auto-incrementing buffer applications.

Availability

709279L12PFI is available at Aetrix Electronics and suitable for real-time DSP co-processing, FPGA-based communication buffers, industrial motion controllers, and redundant safety PLC data exchange requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 709279L12PFI 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 IDT709279 family was designed specifically for high-bandwidth, low-latency inter-processor communication in embedded systems requiring deterministic dual-port memory access - targeting telecom infrastructure, test equipment, and real-time control applications.

FAQ

What is the maximum operating frequency of the 709279L12PFI in pipelined output mode?

The 709279L12PFI supports up to 50MHz operation in pipelined mode, derived from its 20ns maximum clock cycle time (tCYC2). This allows sustained 67MHz burst throughput under ideal conditions, as confirmed by AC Electrical Characteristics Table 11 in the datasheet. The 709279L12PFI achieves this with 9ns clock-to-data (tCD2) and 6ns minimum clock high/low times.

Does the 709279L12PFI support independent address counters on each port?

Yes, the 709279L12PFI includes fully independent address counters per port, controlled by dedicated CNTENL/CNTRSTL (left) and CNTENR/CNTRSTR (right) signals. Each counter advances on the rising edge of its port's clock when CNTEN = VIL, and resets to address 0 when CNTRST = VIL - enabling autonomous sequential access without external address generation logic.

How does the FT/PIPE pin affect timing behavior of the 709279L12PFI?

The FT/PIPE pin configures output latency per port: when driven high (VIH), the 709279L12PFI operates in pipelined mode (1-cycle latency, 9ns tCD2); when low (VIL), it uses flow-through mode (0-cycle latency, 12ns tCD1). Critically, CE0/CE1 become double-buffered in pipelined mode, requiring two clock cycles to deselect - a timing constraint explicitly defined in Note 3 of Truth Table I.

Can the 709279L12PFI be used in depth-expanded memory configurations without external logic?

Yes, the 709279L12PFI supports logic-free depth expansion using its dual chip enables (CE0X/CE1X). As shown in Figure 4 of the datasheet, connecting CE0 of Bank 1 to CE1 of Bank 2 (and vice versa) enables automatic bank selection based on address MSB - eliminating glue logic and reducing signal routing complexity in multi-Mbit memory systems.

What is the standby power consumption of the 709279L12PFI under full CMOS-level disable?

In full standby mode (both ports disabled with CMOS-level inputs: CE0X > VCC − 0.2V and CE1X < 0.2V), the 709279L12PFI draws only 0.2mA typical (ISB3), equivalent to 1mW at 5V. This ultra-low quiescent current is specified in DC Electrical Characteristics Table 9 and makes the 709279L12PFI suitable for battery-backed or energy-constrained industrial systems.