Renesas 709379L9PF8

Overview

709379L9PF8 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, 9 ns pipelined clock-to-data access, 15 ns cycle time, and industrial temperature operation (–40°C to +85°C), deployed in real-time digital signal processing and FPGA co-processor buffering.

For engineers reviewing the 709379L9PF8 datasheet, 709379L9PF8 pinout, 709379L9PF8 application, or 709379L9PF8 equivalent, key selection criteria include pipelined vs. flow-through output mode control via FT/PIPE pins, dual chip enable depth expansion capability, separate upper/lower byte controls for 18-bit bus matching, and TTL-compatible 5 V ±10% single-supply operation.

Technical Context

This device implements fully synchronous dual-port operation with registered address, data, and control inputs-enabling 4 ns setup and 0 ns hold times-and uses self-timed internal write pulses independent of clock edge timing. It supports both pipelined (1-cycle latency, 100 MHz capable) and flow-through (0-cycle latency) output modes per port, selected independently via FT/PIPEL and FT/PIPER pins.

The integrated address counter enables burst-mode sequential access without external address generation; CNTEN and CNTRST pins control counter enable and reset per port. Dual chip enables (CE0/CE1) allow seamless depth expansion across multiple devices without additional logic, while UBL/UBR and LBL/LBR provide independent byte-level write masking for multiplexed bus compatibility.

Key Specifications

Pinout & Package

709379L9PF8 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 corner notch or dot; all VCC and GND pins must be connected per datasheet layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1375V-9BGXI and AS7C33256B-9TIN, the 709379L9PF8 uniquely retains full 5 V TTL compatibility, integrated address counter with ADS override, and guaranteed industrial temperature support-making it irreplaceable in legacy telecom and industrial control upgrades requiring drop-in 5 V dual-port SRAM.

Availability

709379L9PF8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, broadcast video processing, and FPGA-based embedded systems requiring stable component supply across extended product lifecycles.

Supply support for 709379L9PF8 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 microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The 709379L9PF8 belongs to Renesas' legacy IDT synchronous dual-port SRAM portfolio, engineered specifically for deterministic, low-latency inter-processor communication in real-time embedded systems demanding simultaneous access and industrial reliability.

FAQ

What is the maximum operating frequency supported by the 709379L9PF8 in pipelined mode?

The 709379L9PF8 supports up to 100 MHz operation in pipelined output mode, derived from its 15 ns maximum clock cycle time (tCYC2). This is validated across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply, making it suitable for high-throughput real-time applications such as packet buffering and video frame stores where deterministic timing is critical. The 709379L9PF8 achieves this using registered inputs and self-timed write pulses.

Does the 709379L9PF8 support independent output mode selection for left and right ports?

Yes, the 709379L9PF8 supports independent output mode selection: FT/PIPEL configures the left port and FT/PIPER configures the right port. When pulled low (VIL), each port operates in flow-through mode (0-cycle latency); when pulled high (VIH), it enters pipelined mode (1-cycle latency, tCD2 = 9 ns). This flexibility allows asymmetric configurations-for example, left port in pipelined mode for high-speed streaming and right port in flow-through for low-latency control register access.

How does the address counter function in the 709379L9PF8, and what role does ADS play?

The 709379L9PF8 integrates a 15-bit address counter per port, controlled by CNTENL/CNTENR and CNTRSTL/CNTRSTR. When CNTEN = VIL on the rising CLK edge, the counter advances automatically. ADS (Address Strobe) provides override capability: when ADS = VIL, the external address on A0–A14 is latched instead of the counter value-even if CNTEN is active. This enables hybrid addressing for burst transfers with occasional random access, essential in DMA and packet buffer applications.

Can the 709379L9PF8 be used in depth-expanded configurations without external logic?

Yes, the 709379L9PF8 supports logic-free depth expansion using its dual chip enables (CE0 and CE1). Per port, asserting CE0 = VIL and CE1 = VIH enables normal operation, while CE0 = VIH or CE1 = VIL places that port in standby. By cascading CE signals across multiple devices-e.g., CE0 of Device 2 driven by OER of Device 1-up to 64K × 18 or larger arrays can be built without address decoders or glue logic, reducing PCB complexity and signal integrity risk in high-density designs.

Is the 709379L9PF8 still in active production, and what is its lifecycle status?

Yes, the 709379L9PF8 remains an active, non-obsolete part per Renesas' official documentation and ordering information. While the related 709369 variant is obsolete (PDN# SP-17-02), the 709379 family-including the 709379L9PF8-is supported with ongoing manufacturing and distribution. Aetrix Electronics maintains traceable inventory and offers lifecycle coordination, including last-time-buy planning and cross-reference guidance, ensuring continuity for long-lifecycle industrial and telecom programs relying on the 709379L9PF8.