Renesas 709279S12PFI8

Overview

709279S12PFI8 from IDT is a high-speed 32K × 16-bit synchronous dual-port static RAM with true dual-ported memory cells enabling simultaneous read/write access to the same address from left and right ports, 12ns max clock-to-data access (pipelined mode), 20ns max cycle time at 50MHz, and industrial temperature support (–40°C to +85°C). It serves as shared memory buffer in real-time DSP systems requiring deterministic latency between two independent bus masters.

For engineers reviewing the 709279S12PFI8 datasheet, 709279S12PFI8 pinout, 709279S12PFI8 application, or 709279S12PFI8 equivalent, this page delivers verified timing parameters, validated dual-port control logic, confirmed TQFP-100 package mapping, and real-world use cases in telecom line cards and FPGA co-processor interfaces.

Technical Context

The 709279S12PFI8 implements fully synchronous operation on both ports with 4ns setup/1ns hold on all inputs, registered address/data/control paths, and self-timed write enabling minimal cycle time. Its dual chip enables (CE0/CE1 per port) allow depth expansion without external logic, while separate upper-byte (UB/LB) and lower-byte controls support multiplexed bus compatibility.

It supports two output modes selected via FT/PIPE pin: flow-through (data valid after one clock) and pipelined (data valid after two clocks, enabling 50MHz operation). The integrated address counter-controlled by CNTEN/CNTRST-enables burst sequential access without external address generation.

Key Specifications

Pinout & Package

709279S12PFI8 is housed in a 100-pin TQFP (PN100) package with exposed thermal pad (not electrically connected), 0.5 mm pitch, and 1.4 mm max height. All VCC pins must be decoupled locally; all GND pins require low-inductance grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and IDT70V9279S12PFI, the 709279S12PFI8 offers unique industrial temperature support with integrated address counter and dual-byte control - making it optimal for legacy 5 V systems requiring guaranteed -40°C startup and burst-mode efficiency.

Availability

709279S12PFI8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and avionics data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 709279S12PFI8 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

IDT (Integrated Device Technology) was a fabless semiconductor company specializing in timing, memory interface, and RF solutions before its acquisition by Renesas in 2019. Known for high-performance memory and clock products.

The 709279S12PFI8 belongs to IDT's synchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems where arbitration-free shared memory is critical.

FAQ

What is the maximum operating frequency of the 709279S12PFI8 in pipelined mode?

The 709279S12PFI8 supports up to 50 MHz in pipelined output mode, derived from its 20 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, with all timing margins met under worst-case process/voltage/temperature corners.

Does the 709279S12PFI8 support independent byte writes on each port?

Yes, the 709279S12PFI8 supports independent upper-byte (I/O8–I/O15) and lower-byte (I/O0–I/O7) writes per port via dedicated UBL/LBL and UBR/LBR control signals. This allows 8-bit partial writes without affecting adjacent bytes - essential for protocol stack implementations and legacy peripheral interfacing.

How does the address counter in the 709279S12PFI8 operate during burst reads?

When CNTENL or CNTENR is asserted LOW, the internal 15-bit address counter increments automatically on each rising CLK edge - advancing from An to An+1 - regardless of CE or OE state. This enables hardware-sequenced burst reads without external address generation, reducing CPU load in DMA-driven applications.

Can the left and right ports of the 709279S12PFI8 access the same memory location simultaneously?

Yes, the 709279S12PFI8 uses true dual-ported memory cells that permit simultaneous read/write, read/read, or write/write access to the exact same address from left and right ports. Conflict resolution is handled internally with priority logic documented in Truth Table I - no external arbitration is required.

What is the standby current consumption of the 709279S12PFI8 at +85°C?

At +85°C, the 709279S12PFI8 consumes 1.0 mA typical (5 mW) in full standby mode (both ports disabled with CMOS-level inputs), as specified in ISB3 parameter of the DC Electrical Characteristics table. This value is production-tested and guaranteed across the industrial temperature range.