Renesas 709279S15PF8

Overview

709279S15PF8 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 both ports, 15ns clock-to-data access in pipelined mode, 25ns cycle time, and industrial temperature support (–40°C to +85°C), used in real-time interprocessor communication and high-bandwidth buffer applications.

For engineers reviewing the 709279S15PF8 datasheet, 709279S15PF8 pinout, 709279S15PF8 application, or 709279S15PF8 equivalent, key selection considerations include pipelined vs. flow-through output timing, dual chip enable for depth expansion, separate upper/lower byte controls, synchronous clocking with 4ns setup/1ns hold, and TTL-compatible 5V ±10% supply operation.

Technical Context

This device implements fully synchronous dual-port architecture with registered address, data, and control inputs clocked on the rising edge of CLKL/CLKR, supporting independent read/write operations per port. It features dual chip enables (CE0X/CE1X) for seamless depth expansion and an asynchronous output enable (OEX) for flexible bus interfacing.

The internal address counter supports automatic increment via CNTENX and reset via CNTRSTX, while FT/PIPEX selects between flow-through (zero-latency output) and pipelined (one-cycle latency, faster cycle time) output modes - with pipelined mode achieving 67MHz operation and 15ns cycle time.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and IDT70V9279S15PF, the 709279S15PF8 offers higher density (32K × 16), native 5V operation without level shifters, and unique features like address strobe (ADSL/ADSR) and counter enable - making it optimal for legacy industrial controllers and high-throughput 5V ASIC interfaces.

Availability

709279S15PF8 is available at Aetrix Electronics and suitable for real-time interprocessor communication, digital signal processing buffering, and network packet buffering requiring stable component supply across extended product lifecycles.

Supply support for 709279S15PF8 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) was a fabless semiconductor company specializing in high-performance timing, memory interface, and RF solutions before its acquisition by Renesas in 2019.

The IDT709279 family was designed specifically for deterministic, low-latency dual-ported memory applications in industrial control, telecom infrastructure, and test equipment - emphasizing synchronous timing integrity and expandability.

FAQ

What is the maximum operating frequency of the 709279S15PF8 in pipelined mode?

The 709279S15PF8 achieves a 15 ns clock cycle time in pipelined output mode, corresponding to a maximum operating frequency of 67 MHz. This is validated across the industrial temperature range (–40°C to +85°C) with 5.0 V ±10% supply. The device sustains this rate with full synchronous timing margins including 4 ns setup and 1 ns hold on all inputs relative to the clock edge.

Does the 709279S15PF8 support independent byte-wide access on each port?

Yes, the 709279S15PF8 provides separate upper-byte (UBX) and lower-byte (LBX) controls per port, enabling independent 8-bit access to I/O[15:8] or I/O[7:0]. This allows mixing 8-bit and 16-bit transactions on the same port and supports legacy microprocessor buses that require byte-lane granularity without external demultiplexing logic.

How does the address counter function in the 709279S15PF8?

The 709279S15PF8 integrates a 15-bit address counter per port, controlled by CNTENX (enable) and CNTRSTX (reset). When CNTENX is asserted low on a clock edge, the counter increments automatically - eliminating need for external address generation in burst transfers. CNTRSTX resets the counter to address 0, supporting circular buffering or frame restarts without CPU intervention.

Can the left and right ports of the 709279S15PF8 operate at different output modes simultaneously?

Yes, the 709279S15PF8 allows independent configuration: FT/PIPEL sets left-port output mode (VIH = pipelined, VIL = flow-through), while FT/PIPER sets right-port mode. This enables asymmetric operation - for example, pipelined mode on the write port for speed and flow-through on the read port for zero-latency monitoring - without cross-port interference.

What power-saving features does the 709279S15PF8 provide during idle periods?

The 709279S15PF8 offers multi-level power management: asserting CE0X = high or CE1X = low places the respective port in standby (5 mW typ.), while full standby (1 mW typ. for IDT709279L variants) is achieved when both chip enables are deasserted with CMOS-level inputs. These states are entered synchronously on the next clock edge, ensuring predictable power transitions without glitches.