Renesas 709279S12PFI

Overview

709279S12PFI 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, 12ns maximum clock-to-data access in pipelined mode, industrial temperature range (–40°C to +85°C), and TTL-compatible 5V ±10% operation. It serves as shared memory buffer in real-time DSP systems requiring deterministic latency between two independent processors.

For engineers reviewing the 709279S12PFI datasheet, 709279S12PFI pinout, 709279S12PFI application, or 709279S12PFI equivalent, key selection criteria include pipelined vs. flow-through output timing control, dual chip enable support for depth expansion, counter-enabled burst addressing, and industrial-grade reliability in telecom line cards and avionics data concentrators.

Technical Context

The 709279S12PFI implements fully synchronous operation on both ports with 4ns setup and 1ns hold times on all inputs, using edge-triggered registers for address, data, and control signals. Its self-timed write architecture decouples internal write pulse generation from clock edge timing, enabling consistent 15ns cycle time in pipelined mode at 67MHz.

Each port features independent flow-through/pipelined output mode selection via dedicated FT/PIPE pins, separate upper- and lower-byte controls (UB/LB), and asynchronous output enable (OE). The integrated address counter supports automatic incrementing when CNTEN is asserted, with CNTRST providing synchronous reset to address zero.

Key Specifications

Pinout & Package

709279S12PFI is housed in a 100-pin Thin Quad Flatpack (TQFP) package measuring 14mm × 14mm × 1.4mm, with exposed pad not electrically connected. All VCC and GND pins require low-inductance decoupling 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 CY7C1371BV33-167BZI and IDT70V9279S12PFI, the 709279S12PFI provides guaranteed industrial-temperature operation at 5V with proven field reliability in legacy systems, whereas the CY part demands voltage conversion and the IDT70V9279 offers power savings but shares identical timing constraints and footprint.

Availability

709279S12PFI is available at Aetrix Electronics and suitable for telecom line cards, avionics data concentrators, industrial PLC motion controllers, and medical imaging subsystems requiring stable component supply across extended product lifecycles.

Supply support for 709279S12PFI 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, and RF solutions for communications, computing, and industrial markets.

The IDT709279 family was designed specifically for deterministic, low-latency shared memory applications in dual-processor systems, emphasizing simultaneous access capability, industrial temperature resilience, and seamless integration with legacy 5V TTL buses.

FAQ

What is the maximum operating frequency of the 709279S12PFI in pipelined output mode?

The 709279S12PFI supports up to 50MHz continuous operation in pipelined mode, derived from its 20ns maximum clock cycle time (tCYC2). This enables sustained 800MB/s aggregate bandwidth across both ports with no dead cycles between successive accesses, verified under industrial temperature conditions (–40°C to +85°C) and 5.0V ±10% supply.

Does the 709279S12PFI support independent byte-write operations on each port?

Yes, the 709279S12PFI supports independent upper-byte (I/O8–I/O15) and lower-byte (I/O0–I/O7) writes per port using dedicated UBL/UBR and LBL/LBR control signals. When one byte select is LOW and the other HIGH, only the selected byte is written; both LOW enables full 16-bit write. This functionality is fully synchronous and operates identically in both flow-through and pipelined modes.

How does the address counter in the 709279S12PFI interact with external address inputs?

The 709279S12PFI's address counter operates independently of external address lines: when CNTEN is LOW, the internal counter advances on each rising clock edge regardless of ADS state. ADS overrides the counter only when LOW, loading the external address. This allows hybrid operation - e.g., burst reads from counter-generated addresses interspersed with random accesses via ADS - all within the same port session.

Can the left and right ports of the 709279S12PFI operate at different output modes simultaneously?

Yes, the 709279S12PFI allows independent configuration of flow-through or pipelined output mode on each port via separate FT/PIPEL and FT/PIPER pins. This enables asymmetric use cases - for example, left port in pipelined mode for high-throughput streaming while right port remains in flow-through mode for low-latency control register access - without cross-port timing interference.

What power-saving mechanisms does the 709279S12PFI implement during idle periods?

The 709279S12PFI implements three-tiered power management: (1) Full standby (ISB3) draws just 1.0mA typ. when both CE0 and CE1 are deasserted to CMOS levels; (2) Per-port standby (ISB4) consumes 120mA typ. when one port is active and the other disabled; (3) Dynamic current scales linearly with frequency, dropping to 50mA typ. at 0Hz. All modes retain data without refresh.