Renesas 709079S15PFI

Overview

709079S15PFI from Integrated Device Technology is a 32K × 8-bit synchronous dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address from left and right ports, 15 ns clock-to-data access (pipelined mode), industrial temperature range (–40°C to +85°C), and TTL-compatible 5 V ±10% supply - deployed in high-speed packet buffering and real-time DSP co-processing systems.

For engineers reviewing the 709079S15PFI datasheet, 709079S15PFI pinout, 709079S15PFI application, or 709079S15PFI equivalent, key selection criteria include pipelined vs. flow-through output mode configuration via FT/PIPE pin, dual chip enable support for depth expansion without external logic, and verified 15 ns cycle time at 66.7 MHz operation under industrial conditions.

Technical Context

This device implements fully synchronous operation on both ports using rising-edge clocked registers for address, data, and control inputs - delivering 4 ns setup and 1 ns hold timing margins. Its self-timed write architecture enables fast cycle times independent of clock low time, while the address counter (enabled via CNTEN) supports burst-mode sequential addressing with CNTRST for reset to A0.

The 709079S15PFI supports two distinct output modes: pipelined (FT/PIPE = VIH), yielding 9 ns clock-to-data valid (tCD2), and flow-through (FT/PIPE = VIL), with 30 ns tCD1 max. Port-to-port delay (tCWDD) is specified at 50 ns max, critical for inter-port handshake timing in shared-memory architectures.

Key Specifications

Pinout & Package

709079S15PFI is housed in a 100-pin Thin Quad Flatpack (TQFP, PN100) with 0.5 mm pitch, 14 mm × 14 mm footprint, and 1.4 mm height. All VCC and GND pins require proper decoupling per layout guidelines.

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 IDT70V9079S15PFI, the 709079S15PFI uniquely supports 5 V-only operation with integrated address counter and NC A15 for 32K addressing - making it optimal for legacy industrial controllers requiring direct TTL compatibility and burst-mode simplicity.

Availability

709079S15PFI is available at Aetrix Electronics and suitable for telecom packet buffering, DSP co-processor memory, and industrial motion control applications requiring stable component supply across extended product lifecycles.

Supply support for 709079S15PFI 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, and RF power solutions for communications and computing infrastructure.

The IDT709079 family was designed specifically for high-reliability, low-latency shared-memory applications in industrial and telecom equipment - emphasizing synchronous dual-port architecture, industrial temperature resilience, and simplified depth expansion.

FAQ

What is the maximum operating frequency of the 709079S15PFI in pipelined mode?

The 709079S15PFI supports a maximum operating frequency of 66.7 MHz in pipelined output mode, derived from its 15 ns clock cycle time (tCYC2). This timing is guaranteed over the full industrial temperature range (–40°C to +85°C) and 4.5 V to 5.5 V supply, enabling deterministic performance in real-time control systems without derating.

Does the 709079S15PFI support true simultaneous read/write operations on both ports?

Yes, the 709079S15PFI uses true dual-ported memory cells that allow simultaneous access - including concurrent read from one port and write to the same address on the other port. This capability is confirmed in the Functional Block Diagram and Truth Table I, and eliminates arbitration overhead in shared-memory architectures.

Is A15 used as an address pin on the 709079S15PFI?

No, A15 is a No Connect (NC) pin for the 709079S15PFI, as explicitly stated in the datasheet note: "A15X is a NC for IDT709079." The device implements a 32K × 8-bit organization requiring only A0–A14 (15 address bits), unlike the 64K × 8-bit IDT709089 variant which uses A15.

How does the FT/PIPE pin affect timing behavior of the 709079S15PFI?

The FT/PIPE pin selects between two output modes: when driven VIH, the device operates in pipelined mode with 9 ns clock-to-data valid (tCD2) and 15 ns cycle time; when driven VIL, it uses flow-through mode with 30 ns tCD1 and 35 ns cycle time. The pin must be held static during operation - it is treated as a DC control signal, not a dynamic input.

What power-saving features does the 709079S15PFI offer during idle periods?

The 709079S15PFI provides automatic power-down by asserting CE0 = VIH or CE1 = VIL for one clock cycle, reducing standby current to 5 mW typical. This feature is supported on both ports independently, allowing partial shutdown (e.g., disable right port while left port remains active) to optimize system-level power in multi-function modules.