Renesas 709279L9PFG

Overview

709279L9PFG 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 both ports, 9ns pipelined clock-to-data access (max), 15ns cycle time at 67MHz, and industrial temperature support (–40°C to +85°C). It serves as a shared memory buffer in real-time DSP systems requiring deterministic latency between two independent processors.

For engineers reviewing the 709279L9PFG datasheet, 709279L9PFG pinout, 709279L9PFG application, or 709279L9PFG equivalent, key selection criteria include pipelined vs. flow-through output mode configuration via FT/PIPE pin, dual chip enable architecture for depth expansion, separate upper/lower byte controls for bus matching, and TTL-compatible 5V ±10% single-supply operation.

Technical Context

The 709279L9PFG implements fully synchronous operation on both left and right ports, with all control, address, and data inputs registered on the rising edge of CLKL/CLKR. Its self-timed write architecture decouples internal write pulse timing from clock edge transitions, enabling minimal cycle time without external timing constraints.

It supports two distinct output modes: pipelined (FT/PIPE = VIH) delivering 9ns tCD2 with 15ns tCYC2, and flow-through (FT/PIPE = VIL) delivering 20ns tCD1 with 25ns tCYC1. Address strobe (ADSL/ADSR) and counter enable (CNTENL/CNTENR) allow external address loading or automatic sequential addressing, respectively.

Key Specifications

Pinout & Package

709279L9PFG is housed in a 100-pin Thin Quad Flatpack (TQFP) package, body size 14mm × 14mm × 1.4mm, with exposed pad not electrically connected. All VCC pins require local decoupling; all GND pins must be tied 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 IDT70V9279L12PFGI, the 709279L9PFG delivers the fastest pipelined access (9ns) in its family and remains the only option supporting legacy 5V TTL signaling without translation-critical for retrofitting into existing industrial control hardware.

Availability

709279L9PFG is available at Aetrix Electronics and suitable for real-time DSP systems, industrial motion controllers, telecom line cards, and avionics data acquisition requiring stable component supply across extended product lifecycles.

Supply support for 709279L9PFG 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 timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT709279 family was designed specifically for deterministic, low-latency shared memory applications in dual-processor architectures-emphasizing synchronous timing, dual-chip-enable scalability, and industrial reliability.

FAQ

What is the maximum operating frequency of the 709279L9PFG in pipelined mode?

The 709279L9PFG supports up to 67MHz operation in pipelined output mode, derived from its 15ns maximum clock cycle time (tCYC2). This frequency assumes proper signal integrity, 5V ±10% supply, and operation within the industrial temperature range (–40°C to +85°C). The 9ns clock-to-data delay (tCD2) ensures valid data within one clock cycle at this rate.

Does the 709279L9PFG support independent byte enables for 8-bit data transfers?

Yes, the 709279L9PFG provides separate upper-byte (UB) and lower-byte (LB) controls on both left and right ports (UBL/LBL and UBR/LBR). This allows selective 8-bit writes or reads to either I/O0–I/O7 or I/O8–I/O15, enabling compatibility with 8-bit peripheral buses and reducing unnecessary data traffic during partial-word updates.

How does the address counter function on the 709279L9PFG?

The 709279L9PFG includes independent address counters on each port, controlled by CNTEN and CNTRST inputs. When CNTENX = L on the rising CLK edge, the internal address increments automatically; CNTRSTX = L resets the counter to address 0. ADSX = L loads an external address instead, allowing dynamic switching between sequential and random access patterns without software intervention.

What power-saving features does the 709279L9PFG offer in standby mode?

The 709279L9PFG achieves 1mW typical standby power (ISB3) by disabling both ports via CMOS-level chip enables (CE0X > VCC − 0.2V and CE1X < 0.2V). Individual port standby (ISB4) draws 130mW typ., while full TTL-level standby (ISB1) consumes 50mA. These modes are hardware-controlled and require no firmware overhead.

Is the 709279L9PFG pin-compatible with other members of the IDT709279 family?

Yes, the 709279L9PFG shares identical pinout, package (100-pin TQFP), and functional interface with all speed grades (e.g., 709279L12PFG, 709279L15PFG) and power variants (S/L) in the IDT709279 family. Differences are limited to AC timing parameters and power consumption-enabling drop-in replacement during design optimization or cost reduction.