Renesas 709279L15PFI8

Overview

709279L15PFI8 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 left and right ports, 15ns clock-to-data access in pipelined mode, industrial temperature range (–40°C to +85°C), and TTL-compatible 5V ±10% operation - used in real-time interprocessor communication and FPGA co-processor buffering.

For engineers reviewing the 709279L15PFI8 datasheet, 709279L15PFI8 pinout, 709279L15PFI8 application, or 709279L15PFI8 equivalent, key selection criteria include pipelined vs. flow-through output mode configuration via FT/PIPE pin, dual chip enable support for depth expansion without external logic, and separate upper/lower byte controls for multiplexed bus compatibility.

Technical Context

The 709279L15PFI8 implements fully synchronous operation on both ports with 4ns setup and 1ns hold timing on all control, address, and data inputs, using edge-triggered registers clocked on the rising edge of CLKL/CLKR. Its self-timed internal write pulse operates independently of clock transitions, enabling fast cycle times.

It supports two configurable output modes: pipelined (9ns clock-to-data, 15ns cycle time, 67MHz max) and flow-through (30ns cycle time), selected per port via FT/PIPEL and FT/PIPER pins. Address counter functionality - with CNTEN and CNTRST inputs - enables burst-mode sequential addressing without external address generation logic.

Key Specifications

Pinout & Package

709279L15PFI8 is housed in a 100-pin Thin Quad Flatpack (TQFP) package with exposed pad thermal design, body dimensions 14 mm × 14 mm × 1.4 mm, and lead finish compatible with standard Pb-free reflow profiles.

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 IDT70V9279L15PF, the 709279L15PFI8 uniquely combines industrial temperature rating, integrated address counter, and 5V TTL compatibility - making it optimal for legacy industrial control upgrades requiring drop-in reliability without redesign.

Availability

709279L15PFI8 is available at Aetrix Electronics and suitable for real-time interprocessor communication, FPGA co-processor buffering, and industrial PLC I/O expansion requiring stable component supply across extended lifecycle programs.

Supply support for 709279L15PFI8 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT709279 family was engineered specifically for deterministic, low-latency inter-processor data exchange in industrial automation and embedded real-time systems - emphasizing synchronous dual-port concurrency, industrial temperature resilience, and 5V system compatibility.

FAQ

What is the maximum operating frequency of the 709279L15PFI8 in pipelined mode?

The 709279L15PFI8 supports up to 67 MHz in pipelined output mode, derived from its 15 ns clock cycle time (tCYC2). This frequency is guaranteed across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply, with all timing parameters validated under worst-case conditions per the official IDT datasheet DSC-3243/16.

Does the 709279L15PFI8 support independent output modes on left and right ports?

Yes, the 709279L15PFI8 allows independent configuration of pipelined or flow-through output behavior on each port via the dedicated FT/PIPEL (left) and FT/PIPER (right) pins. When FT/PIPEX = VIH, that port operates in pipelined mode (9 ns tCD2); when FT/PIPEX = VIL, it operates in flow-through mode (30 ns tCYC1), enabling mixed-mode system architectures.

How does the address counter function in the 709279L15PFI8?

The 709279L15PFI8 integrates a synchronous address counter per port controlled by CNTENL/CNTENR and CNTRSTL/CNTRSTR. When CNTENX = VIL on the rising CLKX edge, the internal address advances automatically; CNTRSTX = VIL resets it to A0. This eliminates external counter logic in burst-buffer applications - confirmed in Truth Table II and Timing Waveform 13 of the datasheet.

What is the standby power consumption of the 709279L15PFI8?

The 709279L15PFI8 consumes 1 mW typical standby power (ISB3) when both ports are fully deselected with CMOS-level inputs (CE0X > VCC – 0.2 V and CE1X < 0.2 V). This ultra-low quiescent current is specified for the L-grade variant and verified across the industrial temperature range, enabling energy-efficient always-on monitoring subsystems.

Is the 709279L15PFI8 pin-compatible with other members of the IDT709279 family?

Yes, the 709279L15PFI8 shares identical 100-pin TQFP pinout and signal mapping with all speed grades (9ns, 12ns, 15ns) and power variants (S/L) in the IDT709279/69 family, including IDT70V9279L15PF and IDT709279S15PFI. Pin compatibility is explicitly confirmed in the "Pin Configurations" section (page 2) and "Ordering Information" table (page 16) of the datasheet.