Renesas 709279L9PF

Overview

709279L9PF 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, 9ns clock-to-data access in pipelined mode, 15ns cycle time at 67MHz, and industrial temperature support (–40°C to +85°C). It serves as shared memory buffer in real-time DSP systems requiring deterministic latency between two independent processors.

For engineers reviewing the 709279L9PF datasheet, 709279L9PF pinout, 709279L9PF application, or 709279L9PF equivalent, key selection criteria include pipelined vs. flow-through output mode configuration via FT/PIPE pin, dual chip enable architecture for depth expansion without external logic, and TTL-compatible 5V ±10% operation with separate upper/lower byte controls for multiplexed bus compatibility.

Technical Context

The 709279L9PF implements fully synchronous operation on both ports with 4ns setup and 1ns hold times on all control, address, and data inputs, using edge-triggered registers clocked on the rising edge of CLKL/CLKR. Its self-timed write mechanism decouples internal write pulse timing from clock edge transitions, enabling minimal cycle time.

Each port features independent address strobe (ADSL/ADSR), counter enable (CNTENL/CNTENR), and counter reset (CNTRSTL/CNTRSTR) signals, allowing autonomous address generation or external address loading. The FT/PIPE pin configures per-port output behavior-flow-through (data valid on same clock) or pipelined (one-cycle latency)-with double-buffered CE0/CE1 when FT/PIPE = VIH.

Key Specifications

Pinout & Package

100-pin Thin Quad Flatpack (TQFP), PN100 package with 0.5mm pitch, body size 14mm × 14mm × 1.4mm. All VCC pins require local decoupling; all GND pins must be connected to ground plane.

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 709279L9PF uniquely delivers 9ns pipelined access at 5V with industrial temperature rating and direct TTL compatibility-making it optimal for upgrading legacy 5V dual-processor systems without board redesign.

Availability

709279L9PF is available at Aetrix Electronics and suitable for real-time digital signal processing, industrial motion control, automotive ADAS sensor fusion, and telecom packet buffering requiring stable component supply across extended product lifecycles.

Supply support for 709279L9PF 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) 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 deterministic inter-processor communication in dual-CPU systems, emphasizing simultaneous access, low-latency pipelined operation, and industrial-grade reliability.

FAQ

What is the maximum operating frequency of the 709279L9PF in pipelined mode?

The 709279L9PF achieves a maximum operating frequency of 67MHz in pipelined output mode, derived from its 15ns clock cycle time (tCYC2) specification. This timing is guaranteed across the full industrial temperature range (–40°C to +85°C) and 5.0V ±10% supply, making it suitable for high-throughput real-time control applications where deterministic latency is critical. The 709279L9PF maintains this performance without derating under worst-case conditions.

How does the FT/PIPE pin affect timing behavior of the 709279L9PF?

The FT/PIPE pin on the 709279L9PF configures output latency per port: when driven high (VIH), it enables pipelined mode with 9ns clock-to-data (tCD2) and 15ns cycle time; when low (VIL), it selects flow-through mode with 20ns tCD1 and 30ns tCYC1. Critically, FT/PIPE also controls CE0/CE1 buffering-double-buffered in pipelined mode (requiring two cycles to re-enable outputs after deselect), single-buffered in flow-through mode. This directly impacts system-level timing margins and must be considered during state machine design.

Can the 709279L9PF perform simultaneous read and write operations on the same memory location?

Yes, the 709279L9PF uses true dual-ported memory cells that allow simultaneous read and write access to the exact same memory address-one port reading while the other writes-without corruption or arbitration delay. This capability is fundamental to its architecture and is validated across all speed grades and temperature ranges. The 709279L9PF guarantees atomic 16-bit word access, enabling lock-free inter-processor communication essential for real-time DSP and motion control systems.

What power-saving modes does the 709279L9PF support, and how are they activated?

The 709279L9PF supports three power-saving states: (1) Full standby (ISB3 = 1mW typ.) activated when both CE0 and CE1 are held at CMOS high/low thresholds (CE0 > VCC–0.2V and CE1 < 0.2V); (2) Single-port standby (ISB4 = 130mW typ.) when one port's CE0 = L and CE1 = H while the other port is deselected; (3) Dynamic power reduction via clock gating-no clock edges applied to inactive port eliminates switching current. These modes are hardware-controlled with no firmware overhead, making the 709279L9PF suitable for battery-backed industrial systems.

Is the 709279L9PF pin-compatible with other members of the IDT709279 family?

Yes, the 709279L9PF is pin-compatible with all speed grades (709279L12PF, 709279L15PF) and power variants (709279S9PF) within the IDT709279 family, sharing identical 100-pin TQFP (PN100) footprint and pin functions. Differences are limited to AC timing parameters and power consumption-no PCB layout changes are required when migrating between 709279L9PF and other 709279 variants. However, it is not pin-compatible with the older IDT709269 series due to A14 pin functionality differences.