Renesas 709079L15PF

Overview

709079L15PF 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), 25 ns cycle time, and industrial temperature support (–40°C to +85°C). It operates on a single 5V ±10% supply and is used in high-speed interprocessor communication and real-time DSP buffering.

For engineers reviewing the 709079L15PF datasheet, 709079L15PF pinout, 709079L15PF application, or 709079L15PF equivalent, key selection criteria include pipelined vs. flow-through output mode control via FT/PIPE pins, dual chip enable architecture for depth expansion, counter-enable/reset functionality, and low-power standby current of 1 µA (typ.) in full CMOS-level standby.

Technical Context

The 709079L15PF implements fully synchronous operation on both ports with registered address, data, and control inputs-requiring only 4 ns setup and 1 ns hold time relative to CLK. Its self-timed write logic enables fast cycle times independent of clock low time, while the address counter (enabled via CNTEN) supports burst-mode sequential addressing without external sequencing logic.

Each port features independent chip enables (CE0X/CE1X), read/write (R/WX), output enable (OEX), and address strobe (ADSX) signals, allowing asymmetric port control. The FT/PIPEX pin configures each port independently for either flow-through (no latency) or pipelined (1-cycle latency, 9–15 ns tCD2) output timing-critical for deterministic bus arbitration in dual-CPU systems.

Key Specifications

Pinout & Package

709079L15PF is housed in a 100-pin Thin Quad Flatpack (TQFP, PN100) with exposed pad thermal design. Pin 1 is marked by a black dot; all VCC and GND pins must be connected per datasheet Notes 2–3.

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 IDT70V9079L15PF, the 709079L15PF uniquely supports 5V-only operation with integrated address counter and ultra-low 1 µA standby current - making it optimal for cost-sensitive, thermally constrained industrial 5V platforms requiring burst-mode buffering.

Availability

709079L15PF is available at Aetrix Electronics and suitable for industrial motor control, real-time DSP co-processing, and interprocessor communication requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 709079L15PF 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, computing, and industrial markets.

The IDT709079 family was designed specifically for high-reliability, low-latency shared-memory applications in dual-processor systems - emphasizing deterministic timing, industrial temperature operation, and minimal external logic requirements.

FAQ

What is the maximum operating frequency of the 709079L15PF in pipelined mode?

The 709079L15PF supports a maximum clock frequency of 40 MHz in pipelined output mode, derived from its 25 ns clock cycle time (tCYC2). This timing is guaranteed across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply, enabling deterministic real-time data transfer in dual-CPU architectures without additional wait states.

Does the 709079L15PF support flow-through and pipelined output modes simultaneously?

Yes - the 709079L15PF supports independent configuration of flow-through and pipelined modes on left and right ports via separate FT/PIPEL and FT/PIPER pins. This allows asymmetric timing behavior: for example, the left port can operate in pipelined mode for high-throughput DMA writes while the right port uses flow-through mode for low-latency CPU reads.

Is A15 connected or unused on the 709079L15PF?

A15 is a No Connect (NC) pin on the 709079L15PF, as explicitly stated in the datasheet Note 1 on pages 2 and 3. This distinguishes it from the IDT709089 variant (64K × 8), which uses A15. The 709079L15PF implements a 32K × 8 organization addressed by A0–A14 only.

How does the address counter function in the 709079L15PF?

The 709079L15PF includes independent 15-bit address counters per port, controlled by CNTENX and CNTRSTX inputs. When CNTENX = LOW on a rising CLK edge, the counter advances automatically; CNTRSTX = LOW resets it to address 0. This eliminates external address sequencing logic in burst-mode applications like FIFOs or DMA buffers.

What is the standby current consumption of the 709079L15PF under full CMOS-level disable?

In full standby mode - where both ports have CMOS-level inputs (CEX > VCC − 0.2 V and all inputs at rail extremes) - the 709079L15PF consumes 1 µA typical current (ISB3), as specified in Table 9 (p.5). This ultra-low value enables energy-efficient sleep states in battery-backed industrial controllers and remote sensors.