Renesas 70V9079S6PF8

Overview

70V9079S6PF8 from IDT (now Renesas) is a high-speed 32K × 8-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, 12 ns max clock-to-data access in pipelined mode, LVTTL-compatible 3.3 V ±0.3 V operation, and integrated address counter with enable/reset - used in real-time DSP co-processing buffers and FPGA-based protocol bridging.

For engineers reviewing the 70V9079S6PF8 datasheet, 70V9079S6PF8 pinout, 70V9079S6PF8 application, or 70V9079S6PF8 equivalent, key selection criteria include pipelined vs. flow-through output timing, dual-port depth expansion capability via CE0/CE1 control, industrial temperature support (–40°C to +85°C), and low-power standby current of 0.4 mA (typ.) in full CMOS standby mode.

Technical Context

This device implements fully synchronous dual-port architecture with independent clock inputs (CLKL/CLKR), registered address/data/control inputs on both ports, and self-timed internal write pulse decoupled from clock edge timing. It supports two distinct output modes-flow-through (FT/PIPE = VIL) and pipelined (FT/PIPE = VIH)-each with dedicated AC timing parameters including tCD1 (≤25 ns) and tCD2 (≤12 ns) respectively.

The integrated address counter operates independently per port via CNTENL/CNTRSTL and CNTENR/CNTRSTR pins, allowing burst-address generation without external logic. Dual chip enables (CE0X/CE1X) permit seamless depth expansion across multiple devices without additional decoding logic, while asynchronous OE enables flexible bus sharing.

Key Specifications

Pinout & Package

100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm; all VDD pins require local 3.3 V decoupling, all VSS pins must be connected to ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and AS7C3256B-12JIN, the 70V9079S6PF8 uniquely delivers per-port address counters, dual chip enables for seamless depth expansion, and selectable pipelined/flow-through output modes - making it optimal for tightly coupled multi-processor or FPGA-DSP co-processing architectures requiring deterministic latency and minimal external logic.

Availability

70V9079S6PF8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, FPGA-based protocol translation, and real-time DSP co-processing applications requiring stable component supply, long-term lifecycle assurance, and industrial temperature qualification.

Supply support for 70V9079S6PF8 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), now part of Renesas Electronics, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V9079S6PF8 belongs to IDT's synchronous dual-port SRAM product line, engineered specifically for deterministic, low-latency shared memory in multi-processor and FPGA-based real-time systems where concurrent access and precise timing control are critical.

FAQ

What is the maximum operating frequency of the 70V9079S6PF8 in pipelined output mode?

The 70V9079S6PF8 supports up to 83 MHz operation in pipelined output mode (FT/PIPE = VIH), corresponding to a 12 ns clock cycle time (tCYC2). This is validated across the industrial temperature range (–40°C to +85°C) with 3.3 V ±0.3 V supply. The device achieves this frequency through registered inputs and self-timed write architecture, eliminating setup/hold dependency on external clock skew.

Does the 70V9079S6PF8 support independent address counters on both ports?

Yes, the 70V9079S6PF8 provides fully independent address counters on left and right ports, controlled by CNTENL/CNTRSTL and CNTENR/CNTRSTR pins respectively. Each counter is 15-bit and advances on the rising edge of its associated clock when CNTEN is asserted, enabling autonomous burst-mode addressing without host CPU intervention - a feature not present in standard single-port or basic dual-port SRAMs.

How does chip enable logic work on the 70V9079S6PF8 for depth expansion?

The 70V9079S6PF8 uses dual chip enables per port (CE0L/CE1L and CE0R/CE1R), where both CE0X and CE1X must be active (CE0X = VIL, CE1X = VIH) to enable that port. This allows cascading multiple devices using simple AND logic or direct FPGA GPIO mapping - for example, connecting CE0L of device N+1 to CE1L of device N enables daisy-chained depth expansion without external decoders.

What is the standby current consumption of the 70V9079S6PF8 under full CMOS-level disable?

In full standby mode - defined as both ports' CE0X > VDD – 0.2 V and CE1X < 0.2 V, with all inputs at CMOS thresholds - the 70V9079S6PF8 draws 0.4 mA (typical) and 3 mA (max) at +25°C. This ultra-low ISB3 current is achieved via complete internal circuit shutdown and is specified for industrial temperature operation, making it suitable for battery-backed or energy-sensitive embedded systems.

Can the 70V9079S6PF8 operate with different clock frequencies on left and right ports?

Yes, the 70V9079S6PF8 supports independent clock domains: CLKL and CLKR accept asynchronous clock signals with no phase or frequency relationship required. Each port's timing is governed solely by its own clock edge, enabling heterogeneous system integration - e.g., interfacing a 66 MHz PCI bus (left port) with a 100 MHz FPGA fabric (right port) without clock domain crossing logic.