Renesas 709279L12PF

Overview

709279L12PF 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 in pipelined mode, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports flow-through or pipelined output modes via FT/PIPE pin and is used in real-time digital signal processors requiring deterministic memory arbitration.

For engineers reviewing the 709279L12PF datasheet, 709279L12PF pinout, 709279L12PF application, or 709279L12PF equivalent, key selection criteria include pipelined vs. flow-through timing behavior, dual-chip-enable depth expansion capability, counter-enabled burst addressing, separate upper/lower byte controls for multiplexed bus compatibility, and industrial-grade standby power (1mW typ.) under CE-controlled power-down.

Technical Context

The 709279L12PF implements fully synchronous operation on both ports with 4ns setup / 1ns hold 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 without external timing constraints.

It features dual independent address counters per port-enabled by CNTENL/CNTENR and reset by CNTRSTL/CNTRSTR-with ADSL/ADSR allowing external address loading or counter-driven sequential access. The FT/PIPE pin configures each port's output pipeline depth (1-cycle latency when VIH, zero-latency when VIL), and CE0/CE1 logic enables per-port power gating with double-buffered deactivation in pipelined mode.

Key Specifications

Pinout & Package

709279L12PF is housed in a 100-pin TQFP (PN100) package with exposed pad not electrically connected. Pin assignments are symmetric for left (L) and right (R) ports, supporting identical interface layout on both sides of a PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1370D-133BAXI, 709279L12PF delivers guaranteed simultaneous access without arbitration overhead, while versus IDT70V9279L12PF it retains 5V compatibility and legacy system integration - making it optimal for industrial upgrades where voltage migration is constrained.

Availability

709279L12PF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and embedded DSP applications requiring stable component supply, long-term lifecycle support, and industrial-temperature qualification.

Supply support for 709279L12PF 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) is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance silicon solutions, now part of Renesas Electronics since 2019.

The IDT709279 family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems - emphasizing simultaneous dual-port access, industrial reliability, and flexible timing modes for DSP, FPGA, and MCU co-processing architectures.

FAQ

What is the maximum operating frequency of the 709279L12PF in pipelined output mode?

The 709279L12PF supports up to 50 MHz operation in pipelined mode, derived from its 20ns maximum clock cycle time (tCYC2). This timing is specified across the industrial temperature range (–40°C to +85°C) and 5V ±10% supply, with all setup/hold requirements met using standard TTL-level signals. The device achieves this performance through fully registered inputs and self-timed write logic independent of clock edge timing.

Does the 709279L12PF support true simultaneous read/write to the same memory location from both ports?

Yes, the 709279L12PF implements true dual-ported memory cells that allow concurrent read and write operations to the identical address from the left and right ports without collision or data corruption. This is confirmed in the Functional Block Diagram and Features section of the datasheet, which explicitly states "True Dual-Ported memory cells which allow simultaneous access of the same memory location." No arbitration logic or external handshaking is required.

How does the FT/PIPE pin affect timing behavior on each port of the 709279L12PF?

The FT/PIPEL and FT/PIPER pins configure output latency independently per port: when driven HIGH (VIH), the port operates in pipelined mode with 1-cycle data output delay (tCD2 ≤ 12ns), enabling higher throughput; when LOW (VIL), it operates in flow-through mode with zero-cycle latency (tCD1 ≤ 25ns), minimizing read response time. The datasheet confirms this in AC Electrical Characteristics Table 11 and Timing Waveforms Figures 7–8.

Can the 709279L12PF be used for depth expansion without external logic, and how?

Yes, the 709279L12PF supports depth expansion without external logic using its dual chip enables (CE0X and CE1X per port). As shown in Truth Table I and the Depth Expansion section (page 15), asserting CE0=LOW and CE1=HIGH enables a port, while CE0=HIGH or CE1=LOW places it in power-down. Cascading multiple devices requires only routing CE signals - no decoders or gates - enabling configurations like 64K×16 with two 709279L12PFs.

What is the standby current specification for the 709279L12PF, and under what conditions is it measured?

The 709279L12PF has a typical standby current of 1mW (1mA at 5V), measured as ISB3 (Full Standby Current) with both ports disabled via CMOS-level inputs (CE0 and CE1 > VCC – 0.2V), all inputs held at valid logic levels, and f = 0. This ultra-low power state is enabled by its low-power (L) variant design and is validated across the industrial temperature range, making it suitable for energy-constrained embedded systems.