Renesas 709379L7PF8

Overview

709379L7PF8 from Renesas Electronics (formerly IDT) is a high-speed, synchronous, pipelined dual-port static RAM with true dual-ported 32K × 18-bit memory architecture, supporting simultaneous independent access on left and right ports, 7.5 ns clock-to-data in pipelined mode, 10 ns cycle time at 100 MHz, and industrial-grade operation (–40°C to +85°C). It is used in real-time inter-processor communication, FPGA co-processing buffers, and telecom packet buffering.

For engineers reviewing the 709379L7PF8 datasheet, 709379L7PF8 pinout, 709379L7PF8 application, or 709379L7PF8 equivalent, key selection considerations include pipelined vs. flow-through output timing, dual chip-enable depth expansion capability, TTL-compatible 5V ±10% supply, separate upper/lower byte controls, and counter-enabled address auto-increment for burst transfers.

Technical Context

This device implements fully synchronous dual-port operation with registered address, data, and control inputs on both ports-requiring only 4 ns setup and 0 ns hold relative to CLK. Its self-timed write logic enables minimal cycle time, while the FT/PIPE pin selects between pipelined (1-cycle latency, 7.5 ns tCD2) and flow-through (0-cycle latency, 18 ns tCD1) output modes per port independently.

The integrated address counter supports automatic increment on each read/write when CNTEN is asserted, with CNTRST enabling synchronous reset to address 0. Dual CE0/CE1 per port allow independent power-down of each port's internal circuitry, achieving 2.5 mW standby power, and support seamless depth expansion without external logic.

Key Specifications

Pinout & Package

709379L7PF8 is housed in a 100-pin Thin Quad Flatpack (TQFP) package with exposed pad (PN100), requiring all VCC pins to be connected to 5V and all GND pins to system ground. Pin numbering follows standard top-view convention with corner marker.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1375KV18-167BZC and AS7C331624B-12JIN, the 709379L7PF8 uniquely combines 5V TTL compatibility, industrial temperature range, integrated address counter with reset, and selectable pipelined/flow-through output modes-making it optimal for legacy industrial and telecom systems requiring robust, feature-rich dual-port memory without voltage translation or external sequencing logic.

Availability

709379L7PF8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and FPGA-based embedded systems requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature performance.

Supply support for 709379L7PF8 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

Renesas Electronics Corporation is a global semiconductor leader delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT applications, formed through the integration of IDT and Intersil.

The 709379L7PF8 belongs to Renesas' legacy IDT synchronous dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor communication and high-throughput buffering in real-time embedded systems.

FAQ

What is the maximum operating frequency of the 709379L7PF8 in pipelined mode?

The 709379L7PF8 supports a maximum clock frequency of 100 MHz in pipelined output mode, corresponding to a 12 ns minimum clock cycle time (tCYC2) and 7.5 ns maximum clock-to-data valid delay (tCD2). This timing is guaranteed over the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply, making it suitable for high-speed FPGA and ASIC interfaces requiring deterministic latency.

Does the 709379L7PF8 support independent output mode selection for left and right ports?

Yes, the 709379L7PF8 provides independent output mode control via dedicated FT/PIPEL (left port) and FT/PIPER (right port) pins. Setting either pin to VIH configures that port for pipelined operation (1-cycle latency), while VIL selects flow-through mode (0-cycle latency). This allows asymmetric timing configurations-for example, using pipelined mode for high-speed writes and flow-through for low-latency reads on the same device.

How does the address counter function in the 709379L7PF8, and what triggers an increment?

The 709379L7PF8 includes a synchronous 15-bit address counter per port. An increment occurs on the rising edge of CLK when CNTEN is low (VIL), regardless of CE0, CE1, UB, LB, or OE states. The counter advances from An to An+1 and remains stable until the next qualifying CLK edge. Address loading via ADS=VIL overrides the counter and loads the external address, enabling hybrid burst/sequential access patterns.

Can the 709379L7PF8 be used in depth-expanded memory configurations, and what logic is required?

Yes, the 709379L7PF8 supports depth expansion using its dual chip-enable inputs (CE0X and CE1X) per port. By tying CE0 of one device to CE1 of the next and driving them with complementary signals, two or more devices can be cascaded without external decoding logic. This configuration maintains full 18-bit width while doubling (or multiplying) depth-ideal for building 64K×18 or larger memory banks with minimal gate count.

What is the power consumption profile of the 709379L7PF8 in active and standby modes?

The 709379L7PF8 consumes 1.2 W typical active power (both ports enabled, outputs disabled, fMAX) and only 2.5 mW typical standby power (both ports deselected via CE0/CE1). Standby current drops further to 0.5 mA in full CMOS-level standby (CE0/CE1 > VCC−0.2 V). This low-power design enables thermal efficiency in densely packed memory subsystems and extends operational life in battery-backed industrial equipment.