Renesas 709279S12PF8

Overview

709279S12PF8 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 both ports, 12ns max clock-to-data access (pipelined mode), 20ns clock cycle time in pipelined mode, and industrial temperature support (–40°C to +85°C), used in real-time embedded systems requiring deterministic memory arbitration between two independent processors or bus masters.

For engineers reviewing the 709279S12PF8 datasheet, 709279S12PF8 pinout, 709279S12PF8 application, or 709279S12PF8 equivalent, key selection criteria include pipelined vs. flow-through output timing, dual chip enable depth expansion capability, separate upper/lower byte controls for multiplexed bus compatibility, and TTL-compatible 5V ±10% single-supply operation.

Technical Context

The 709279S12PF8 implements fully synchronous operation on both left and right ports with registered address, data, and control inputs-requiring only 4ns setup and 1ns hold time relative to CLK. Its self-timed write architecture enables fast cycle times independent of clock low time, while the FT/PIPE pin selects between flow-through (zero-latency read) and pipelined (one-cycle latency, higher throughput) output modes per port.

Dual chip enables (CE0X/CE1X) allow seamless depth expansion without external logic; counter enable (CNTENX) and reset (CNTRSTX) pins support burst-addressing applications; and separate upper-byte (UBX) and lower-byte (LBX) controls provide byte-level granularity for 16-bit bus matching and interleaved data transfers.

Key Specifications

Pinout & Package

100-pin Thin Quad Flatpack (TQFP), PN100 package with 0.5 mm pitch; body dimensions 14 mm × 14 mm × 1.4 mm; requires all VCC and GND pins to be connected per datasheet layout guidelines.

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 IDT70V9279S12PF, the 709279S12PF8 offers native 5V operation, integrated address counter, and industrial temperature support-making it optimal for legacy 5V embedded systems requiring deterministic burst-mode memory access without external logic.

Availability

709279S12PF8 is available at Aetrix Electronics and suitable for telecom line cards, real-time DSP subsystems, industrial PLCs, avionics data recorders, and military communications equipment requiring stable component supply across extended product lifecycles.

Supply support for 709279S12PF8 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, computing, and industrial markets.

The IDT709279 family was designed specifically for high-reliability, deterministic dual-processor memory sharing in telecom infrastructure, test equipment, and real-time control systems demanding sub-20ns access and industrial temperature resilience.

FAQ

What is the maximum operating frequency of the 709279S12PF8 in pipelined mode?

The 709279S12PF8 supports a maximum clock frequency of 50 MHz in pipelined output mode, derived from its 20 ns maximum clock cycle time (tCYC2). This timing is guaranteed across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply, making it suitable for deterministic real-time systems where cycle consistency is critical. The 709279S12PF8 achieves this performance without PLL-based clock multiplication.

Does the 709279S12PF8 support independent byte-write operations on each port?

Yes, the 709279S12PF8 supports independent upper- and lower-byte writes per port via dedicated UBX and LBX control signals. When UBX = L and LBX = H, only I/O8–I/O15 are written; when UBX = H and LBX = L, only I/O0–I/O7 are written; both low enables full 16-bit write. This capability is implemented at the silicon level and requires no external logic, directly benefiting multiplexed bus architectures and partial-word updates in the 709279S12PF8.

How does the address counter function in the 709279S12PF8, and what triggers it?

The 709279S12PF8 includes a 15-bit synchronous address counter per port, enabled by asserting CNTENX = L on the rising edge of CLKX. When active, the counter automatically increments the internal address after each access, regardless of ADSX state. CNTRSTX = L resets the counter to address 0. This hardware counter reduces host processor overhead in burst-mode applications and is fully functional in both pipelined and flow-through modes of the 709279S12PF8.

Can the left and right ports of the 709279S12PF8 operate in different output modes simultaneously?

Yes, the 709279S12PF8 allows independent configuration of output mode per port using FT/PIPEL (left) and FT/PIPER (right). One port may be set to pipelined (FT/PIPEX = VIH) for high-throughput streaming, while the other operates in flow-through (FT/PIPEX = VIL) for zero-latency control register access. This flexibility is built into the 709279S12PF8's dual-port architecture and does not require shared mode control signals.

Is the 709279S12PF8 pin-compatible with other members of the IDT709279 family, such as the 709279S9 or 709279S15?

Yes, all speed grades of the IDT709279S/L series-including 709279S9, 709279S12, and 709279S15-share identical 100-pin TQFP pinouts and electrical interfaces. The only differences are AC timing parameters (access time, cycle time) and DC power consumption; no PCB layout changes are required when upgrading or downgrading speed grades within the same power variant (S or L) of the 709279S12PF8 family.