Renesas 709079S12PFI

Overview

709079S12PFI from Integrated Device Technology is a 32K × 8-bit synchronous dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address from both ports, 12 ns max clock-to-data access in pipelined mode, industrial temperature range (–40°C to +85°C), and TTL-compatible 5 V ±10% supply. It serves in real-time embedded systems requiring concurrent read/write operations across independent data paths, such as digital signal processors interfacing with FPGA-based control logic.

For engineers reviewing the 709079S12PFI datasheet, 709079S12PFI pinout, 709079S12PFI application, or 709079S12PFI equivalent, key selection criteria include pipelined vs. flow-through output timing, dual-chip-enable depth expansion capability, counter enable/reset functionality for burst addressing, and industrial-grade power consumption (950 mW active / 5 mW standby typical).

Technical Context

The 709079S12PFI implements fully synchronous operation on both left and right ports, with all control, address, and data inputs registered on the rising edge of CLKL/CLKR. Its self-timed write architecture enables fast cycle times independent of clock low time, supporting 66.7 MHz operation in pipelined mode (15 ns cycle time).

It features dual independent address counters (CNTENL/CNTRSTL and CNTENR/CNTRSTR), asynchronous output enable (OEL/OER), and FT/PIPEL/FT/PIPER pins selecting between flow-through (zero-latency) or pipelined (one-cycle latency) output modes per port - critical for deterministic timing in high-speed inter-processor communication.

Key Specifications

Pinout & Package

709079S12PFI is housed in a 100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, with 0.5 mm lead pitch and exposed thermal pad (PN100 package code). All VCC and GND pins must be individually decoupled 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 IDT709079S12PFI, IDT70V9079S12PFI delivers identical timing and interface compatibility with reduced thermal load, while CY7C094V-12AXC requires PCB redesign and additional logic for counter functionality - making the IDT709079S12PFI optimal for new industrial control and avionics designs prioritizing integration and thermal margin.

Availability

709079S12PFI is available at Aetrix Electronics and suitable for telecom infrastructure, avionics display subsystems, and industrial motion controllers requiring stable component supply across extended product lifecycles.

Supply support for 709079S12PFI 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 and computing markets.

The IDT709079S12PFI belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems demanding concurrent access and industrial reliability.

FAQ

What is the maximum operating frequency of the 709079S12PFI in pipelined mode?

The 709079S12PFI supports up to 66.7 MHz in pipelined output mode, derived from its 15 ns maximum clock cycle time (tCYC2). This frequency is guaranteed across the full industrial temperature range (–40°C to +85°C) and 4.5–5.5 V supply, with all AC timing parameters validated under those conditions per the official IDT datasheet DSC-3242/16.

Does the 709079S12PFI support independent clock domains on left and right ports?

No - the 709079S12PFI requires synchronous operation: CLKL and CLKR must be driven from the same clock source or phase-aligned clocks. While ports operate independently in terms of address/data/control, the internal registers are clocked on the rising edge of their respective clocks, and timing relationships (e.g., tCCS, tCWDD) assume correlated clock edges as defined in the datasheet's port-to-port delay specifications.

How does the address counter function in the 709079S12PFI, and what triggers it?

The 709079S12PFI includes two independent 15-bit address counters (one per port). When CNTENL or CNTENR is held low, the counter advances by one on each rising edge of CLKL or CLKR, regardless of CE or ADS state. The counter resets to zero when CNTRSTL or CNTRSTR is pulsed low. ADS must be high to enable counter use; if ADS is low, external address inputs override the counter output.

Can the 709079S12PFI be used in flow-through mode, and what is the access latency?

Yes - setting FT/PIPEL or FT/PIPER to VIL configures the corresponding port for flow-through output mode, delivering data with zero-cycle latency after clock edge. In this mode, tCD1 is 25 ns max (for 709079S12PFI), and the clock cycle time tCYC1 is 30 ns max, resulting in deterministic 33.3 MHz operation with immediate data availability - ideal for applications requiring minimal read-to-use delay.

What is the purpose of the dual chip enable (CE0/CE1) structure on each port of the 709079S12PFI?

The dual CE0/CE1 per port implements a two-level enable scheme: CE0 = VIL and CE1 = VIH enables the port; any other combination disables it. This allows seamless depth expansion - for example, cascading two 709079S12PFI devices using CE1 of the first as CE0 of the second - eliminating external logic gates and reducing propagation delay in memory bank selection.