Renesas 709079L15PF8

Overview

709079L15PF8 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 pipelined clock-to-data access (tCD2), 25 ns pipelined cycle time (tCYC2), and industrial temperature support (–40°C to +85°C). It is used in high-speed bidirectional data buffering applications such as network packet switching engines and real-time DSP co-processing interfaces.

For engineers reviewing the 709079L15PF8 datasheet, 709079L15PF8 pinout, 709079L15PF8 application, or 709079L15PF8 equivalent, key selection criteria include pipelined vs. flow-through output mode configuration via FT/PIPE pin, dual chip enable architecture for depth expansion without external logic, and low-power standby current of 1 µA (typ.) in full CMOS-level standby (ISB3).

Technical Context

The 709079L15PF8 implements fully synchronous operation on both left and right ports with registered address, data, and control inputs-requiring only 4 ns setup and 1 ns hold relative to CLK. 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 without external sequencing logic.

It supports two distinct output modes: Flow-Through (FT/PIPE = VIL, tCD1 = 30 ns max) and Pipelined (FT/PIPE = VIH, tCD2 = 15 ns max), with separate CE0/CE1 controls per port allowing independent power-down of either port. A15 is NC (no connect), confirming its identity as the 32K × 8 variant (IDT709079), not the 64K × 8 IDT709089.

Key Specifications

Pinout & Package

709079L15PF8 is housed in a 100-pin TQFP (PN100) package with 0.5 mm pitch, 14 mm × 14 mm footprint, and 1.4 mm height. Pin 1 is marked by a black dot; all VCC and GND pins must be connected per datasheet note.

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 709079L15PF8 offers native 5 V compatibility and proven thermal stability in legacy industrial systems, while the IDT70V9079L15PF provides measurable power savings without sacrificing footprint or timing.

Availability

709079L15PF8 is available at Aetrix Electronics and suitable for telecom packet buffering, DSP co-processor interfacing, and industrial PLC I/O mapping requiring stable component supply across extended production lifecycles.

Supply support for 709079L15PF8 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 power management ICs for communications, computing, and industrial markets.

The IDT7090xx family was designed specifically for high-bandwidth, low-latency shared-memory architectures in networking equipment and real-time embedded systems-emphasizing simultaneous dual-port access, synchronous timing rigor, and industrial reliability.

FAQ

What is the maximum operating frequency of the 709079L15PF8 in pipelined mode?

The 709079L15PF8 supports a maximum operating frequency of 40 MHz in pipelined output mode, derived from its guaranteed 25 ns pipelined clock cycle time (tCYC2). This value is validated across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply, making it suitable for deterministic real-time data throughput in telecom and test equipment applications. The 709079L15PF8 achieves this without requiring external PLLs or clock doublers.

Does the 709079L15PF8 support independent power-down of each port?

Yes, the 709079L15PF8 supports independent port power-down using dual chip enables per port (CE0L/CE1L for left, CE0R/CE1R for right). When CE0 = VIL and CE1 = VIH, the port is active; any other CE combination places that port's internal circuitry into low-power standby. This allows the left port to remain active while the right port draws only 1 µA (ISB3), a capability confirmed in the DC Electrical Characteristics table for the L-grade device.

Is A15 connected or unused on the 709079L15PF8?

A15 is explicitly designated as NC (no connect) for the 709079L15PF8, confirming its 32K × 8-bit (256 Kbit) memory organization. This is documented in Note 1 of the Pin Configuration diagram and reinforced in the Functional Description section, which states "A15X is a NC for IDT709079." Therefore, A15 must be left unconnected or tied to ground/VCC only if required for mechanical stability-not for addressing.

How does the address counter function in the 709079L15PF8?

The 709079L15PF8 integrates a hardware address counter per port, controlled by CNTENL/CNTENR and CNTRSTL/CNTRSTR. When CNTEN = VIL on the rising CLK edge, the internal address advances by one regardless of ADS state. CNTRST asynchronously resets the counter to A0. This feature enables burst-mode sequential access without external address generation logic-verified in Truth Table II and Timing Waveform 13 (Read with Counter Advance).

What is the significance of the "L" suffix in 709079L15PF8?

The "L" in 709079L15PF8 denotes the low-power variant of the IDT709079 family, distinguishing it from the standard-power "S" version. Per the datasheet, the L-grade achieves 1 µA typical full standby current (ISB3) versus 5 µA for the S-grade, while maintaining identical timing (15 ns tCD2) and functional behavior. This suffix directly maps to the "Power" field in the Ordering Information table and is validated in the DC Electrical Characteristics table.