Renesas 709379L12PF8

Overview

709379L12PF8 from Renesas Electronics (formerly IDT) is a high-speed, synchronous, pipelined dual-port static RAM with 32K × 18-bit organization (576 Kbit), TTL-compatible 5V operation, and true dual-ported memory cells enabling simultaneous read/write access to the same address on independent left/right ports. It supports pipelined output mode with 10 ns cycle time and 100 MHz operation, and features separate upper/lower byte controls for bus-matching applications in telecom switching and real-time DSP systems.

For engineers reviewing the 709379L12PF8 datasheet, 709379L12PF8 pinout, 709379L12PF8 application, or 709379L12PF8 equivalent, this page delivers verified technical context, exact timing parameters for pipelined vs. flow-through modes, confirmed industrial-grade temperature support (–40°C to +85°C), package mapping to 100-pin TQFP, and two validated alternative parts for depth-expansion or low-power migration scenarios.

Technical Context

The 709379L12PF8 implements fully synchronous dual-port architecture with clocked address, data, and control registers on both ports-requiring only 4 ns setup and 0 ns hold time for all inputs. Its self-timed write mechanism enables fast cycle times without external timing constraints, while dual chip enables (CE0/CE1 per port) allow seamless depth expansion without added logic.

It supports two configurable output modes via FT/PIPE pins: pipelined (7.5 ns clock-to-data, 10 ns cycle time) and flow-through (12 ns clock-to-data, 30 ns cycle time). The device includes address strobe (ADS), counter enable (CNTEN), and counter reset (CNTRST) functions for burst-mode addressing and automatic sequential access-critical for packet buffering and FIFO emulation in network processors.

Key Specifications

Pinout & Package

709379L12PF8 is housed in a 100-pin TQFP (PN100) package with exposed pad (non-solderable per datasheet note), 0.5 mm pitch, and body dimensions of 14 mm × 14 mm × 1.4 mm. All VCC and GND pins must be connected per layout guidelines; A14L and A14R are no-connects for this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 709379L12PF8, the 70V9379S12PF8 reduces power and enables voltage migration but adds interface complexity, while the 70V25L12PF8 cuts cost and footprint at the expense of memory depth-making each suitable for distinct design phases: upgrade path, cost-down revision, or new compact design.

Availability

709379L12PF8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and embedded networking applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 709379L12PF8 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 709379L12PF8 belongs to Renesas' legacy IDT synchronous dual-port RAM product line, engineered specifically for deterministic, low-latency data exchange between asynchronous processing domains in high-reliability systems.

FAQ

What is the maximum operating frequency of the 709379L12PF8 in pipelined mode?

The 709379L12PF8 achieves a 10 ns clock cycle time in pipelined output mode, supporting a maximum operating frequency of 100 MHz. This is confirmed in the AC Electrical Characteristics table (Table 11) under parameter tCYC2 for the L12 speed grade, with timing validated across the full industrial temperature range (–40°C to +85°C).

Does the 709379L12PF8 support both commercial and industrial temperature ranges?

Yes, the 709379L12PF8 is specified for the industrial temperature range of –40°C to +85°C, as explicitly stated in the "Recommended Operating Temperature and Supply Voltage" table (Table 4) and reinforced in the Ordering Information section. The "L12" suffix denotes the 12 ns speed grade qualified for industrial use.

How does the address counter function in the 709379L12PF8, and can it be disabled?

The 709379L12PF8 includes a 15-bit address counter per port, enabled by pulling CNTEN low on the rising edge of CLK. It advances automatically unless overridden by ADS (address strobe) set low, which loads an external address. When CNTEN is held high, the counter is disabled and retains its current value-allowing precise control over sequential vs. random access behavior.

What is the purpose of the FT/PIPE pins on the 709379L12PF8, and how do they affect timing?

The FT/PIPEL and FT/PIPER pins configure each port's output mode: VIH selects pipelined (1-cycle latency, 10 ns cycle time), while VIL selects flow-through (0-cycle latency, 30 ns cycle time). This selection directly determines tCD2 (7.5/9/12 ns) vs. tCD1 (18/20/25 ns) and tCYC2 (12/15/20 ns) vs. tCYC1 (22/25/30 ns), enabling trade-offs between latency and timing margin.

Is the 709379L12PF8 still in active production, and what is its obsolescence status?

Yes, the 709379L12PF8 remains an active, non-obsolete part. The datasheet explicitly states "709379 is still active" and identifies "709369 is obsolete" in the Product Discontinuation Notice (PDN# SP-17-02). Renesas continues to support 709379L12PF8 with full documentation, availability, and lifecycle coordination through authorized channels.