Renesas 709079L9PF

Overview

709079L9PF 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 both ports, 15 ns clock-to-data access in pipelined mode, 15 ns cycle time at 66.7 MHz, and industrial temperature support (–40°C to +85°C), used in high-speed inter-processor communication and real-time DSP buffering.

For engineers reviewing the 709079L9PF datasheet, 709079L9PF pinout, 709079L9PF application, or 709079L9PF equivalent, this page delivers verified timing parameters, port-synchronous register behavior, FT/PIPE mode selection, counter enable/reset functionality, and depth-expansion-ready dual chip enables - all confirmed for the exact 709079L9PF variant.

Technical Context

The 709079L9PF implements fully synchronous operation on both left and right ports: all control, address, and data inputs register on the rising edge of CLK with 4 ns setup and 1 ns hold time; self-timed write enables fast cycle time without external timing control. Its address counter advances only when CNTEN = VIL on CLK rise, independent of CE0/CE1 state.

It supports two output modes selected per port via FT/PIPE pin: flow-through (tCD1 = 30 ns max) or pipelined (tCD2 = 15 ns max); ADS is asynchronous and independent of CE0/CE1, allowing immediate address latching. A15 is NC - confirming its identity as the 32K × 8 (IDT709079) variant, not the 64K × 8 IDT709089.

Key Specifications

Pinout & Package

709079L9PF is housed in a 100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, with 24 ground and 12 power pins distributed across all four sides for low-noise synchronous operation.

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 IDT70V9079L15PF, the 709079L9PF uniquely combines 5 V TTL compatibility, integrated address counter, dual CE logic, and NC-A15 confirmation of 32K × 8 density - making it optimal for legacy industrial control upgrades where pinout and voltage alignment are critical.

Availability

709079L9PF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, avionics data concentrators, and real-time DSP subsystems requiring stable component supply across extended product lifecycles.

Supply support for 709079L9PF 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 sensor signal conditioning ICs.

The IDT709079 family was designed specifically for high-reliability, high-speed inter-processor communication and real-time buffering in industrial, telecom, and aerospace systems demanding deterministic latency and dual-clock domain isolation.

FAQ

What is the memory organization of the 709079L9PF?

The 709079L9PF is a 32K × 8-bit synchronous dual-port static RAM, meaning it contains 32,768 words of 8-bit data (256 Kbit total). This is confirmed by the NC (No Connect) status of A15 pin - distinguishing it from the 64K × 8 IDT709089 variant which uses A15. The device supports independent addressing and data transfer on left and right ports simultaneously.

Does the 709079L9PF support both pipelined and flow-through output modes?

Yes, the 709079L9PF supports both modes per port via the FT/PIPEL and FT/PIPER pins. When pulled LOW, outputs operate in flow-through mode (tCD1 = 30 ns max, zero latency). When pulled HIGH, outputs enter pipelined mode (tCD2 = 15 ns max, 1-cycle latency), enabling faster 66.7 MHz operation. Mode selection is DC-controlled and independent per port.

What is the purpose of the CNTEN and CNTRST pins on the 709079L9PF?

The CNTEN (Counter Enable) and CNTRST (Counter Reset) pins provide per-port control of an internal address counter. When CNTEN = LOW on CLK rise, the counter advances automatically; CNTRST = LOW resets it to address 0. This eliminates external address sequencing logic in burst-mode applications like FIFO emulation or DMA-driven data streaming - a key differentiator of the 709079L9PF.

How does the 709079L9PF handle power management in standby mode?

The 709079L9PF offers multiple standby states. Full standby (ISB3) draws just 1 mW typ. when both ports are disabled via CMOS-level CE inputs (CE > VCC − 0.2 V). Partial standby (ISB4) draws 110–120 mA typ. when one port is active. Power-down is controlled independently per port using CE0/CE1 logic - a HIGH on CE0 or LOW on CE1 disables that port's internal circuitry without affecting the other port.

Is the 709079L9PF compatible with 5 V TTL logic families?

Yes, the 709079L9PF is fully TTL-compatible with a 5.0 V ±10% supply (4.5 V to 5.5 V). Input thresholds meet TTL specifications (VIH ≥ 2.2 V, VIL ≤ 0.8 V), and output drive strength supports standard TTL loads (VOH ≥ 2.4 V at –4 mA, VOL ≤ 0.4 V at +4 mA). This ensures direct interfacing with legacy 5 V microcontrollers, FPGAs, and ASICs without level shifters.