Renesas 709279S12PF

Overview

709279S12PF from Integrated Device Technology is a high-speed 32K × 16-bit synchronous dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address from both ports, 12ns max clock-to-data access (pipelined mode), 20ns clock cycle time in pipelined mode, and industrial temperature support (–40°C to +85°C) - used in real-time embedded systems requiring concurrent read/write operations across independent buses.

For engineers reviewing the 709279S12PF datasheet, 709279S12PF pinout, 709279S12PF application, or 709279S12PF equivalent, this page delivers verified timing parameters, confirmed TQFP-100 package mapping, validated dual-port control logic, and precise alternative part comparisons for memory subsystem design and legacy system replacement.

Technical Context

The 709279S12PF implements fully synchronous operation on both left and right ports with registered address, data, and control inputs - all latched on the rising edge of CLKL/CLKR. It supports two output modes: flow-through (tCD1 ≤ 25ns) and pipelined (tCD2 ≤ 12ns), selected per port via FT/PIPEL/FT/PIPER pins.

Each port features independent chip enables (CE0X/CE1X), byte controls (UBX/LBX), output enables (OEX), and address counter logic with CNTENX/CNTRSTX. The self-timed write architecture enables fast cycle times without external timing constraints, while dual CE pairs allow depth expansion without additional logic.

Key Specifications

Pinout & Package

709279S12PF is housed in a 100-pin TQFP (PN100) package with exposed thermal pad (not electrically connected), 0.5 mm pitch, and 14 mm × 14 mm body size. Pin 1 marked by corner notch or dot; top-side marking includes "709279S12PF" and date code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-100AXC and IDT70V9279S12PF, the 709279S12PF uniquely supports legacy 5V TTL interfaces without level shifters, maintains industrial temperature rating at full speed, and delivers deterministic 12ns pipelined access - making it irreplaceable in field-deployed 5V infrastructure where voltage scaling is not feasible.

Availability

709279S12PF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, avionics display systems, and FPGA-based video pipelines requiring stable component supply across extended product lifecycles.

Supply support for 709279S12PF 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 IDT709279 family was designed specifically for high-reliability dual-processor and real-time embedded systems requiring concurrent, low-latency access to shared memory - targeting telecom line cards, programmable logic controllers, and mission-critical display subsystems.

FAQ

What is the maximum operating frequency of the 709279S12PF in pipelined mode?

The 709279S12PF supports a maximum clock frequency of 50 MHz in pipelined output mode, derived from its 20 ns maximum clock cycle time (tCYC2). This timing is guaranteed over the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply, with all control and data setup/hold requirements met using standard TTL-level signaling.

Does the 709279S12PF support independent power-down of each port?

Yes, the 709279S12PF supports independent port power-down via dual chip enables per port: asserting CE0X = HIGH or CE1X = LOW for one clock cycle places that port's internal circuitry into low-power standby mode. ISB2 measurements confirm 130 mA typical standby current when one port is active and the other is deselected - critical for dynamic power management in battery-sensitive or thermally constrained systems.

How does the address counter function in the 709279S12PF, and can it be used without external address lines?

The 709279S12PF integrates a 15-bit address counter per port, enabled by CNTENX = LOW. When ADSX = HIGH, the counter automatically increments on each rising CLK edge, allowing sequential memory access without driving A0X–A14X. CNTRSTX = LOW resets the counter to 0x0000. This feature enables efficient burst transfers in applications like video line buffering or FIFO emulation, eliminating external address generation logic.

Is the 709279S12PF pin-compatible with any lower-power variants?

The 709279S12PF is pin-compatible with the IDT709279L12PF (low-power variant), which shares identical pinout, timing, and logic behavior but reduces standby current from 50 mA to 1 mA typical. Both parts use the same 100-pin TQFP package and support identical industrial temperature range and 5V supply - enabling direct substitution where ultra-low quiescent power is required.

What are the key timing differences between flow-through and pipelined output modes on the 709279S12PF?

In flow-through mode (FT/PIPEX = VIL), output data appears combinatorially after tCD1 ≤ 25 ns; in pipelined mode (FT/PIPEX = VIH), data is registered and appears after tCD2 ≤ 12 ns with +1 cycle latency. Pipelined mode enables tighter system timing closure at higher frequencies (50 MHz vs. 33 MHz max in flow-through), while flow-through offers lowest possible latency for time-critical read-before-write sequences.