Renesas 70V9289L7PFG

Overview

70V9289L7PFG from IDT (Integrated Device Technology) is a high-speed, 3.3V synchronous dual-port static RAM with true dual-ported 64K × 18-bit memory architecture, supporting simultaneous read/write access to the same location on independent left and right ports. It delivers pipelined clock-to-data access in 7.5 ns (max), operates at 83 MHz, and features flow-through or pipelined output modes, dual chip enables for depth expansion, and industrial-grade temperature support (–40°C to +85°C). It is used in real-time DSP interprocessor communication buffers and FPGA co-processor memory interfaces.

For engineers reviewing the 70V9289L7PFG datasheet, 70V9289L7PFG pinout, 70V9289L7PFG application, or 70V9289L7PFG equivalent, key selection criteria include its 128-pin TQFP package, LVTTL-compatible 3.3V operation, synchronous dual-port timing (4 ns setup, 0 ns hold), pipelined 12 ns cycle time, and integrated address counter with reset/enable - all critical for deterministic low-latency memory sharing between parallel processing units.

Technical Context

The 70V9289L7PFG implements fully synchronous dual-port operation with independent clock inputs (CLKL/CLKR), registered address/data/control paths, and self-timed write logic decoupled from clock edge timing. Its dual-port architecture uses true dual-ported SRAM cells enabling concurrent access without arbitration logic.

It supports two configurable output modes via FT/PIPE pins: pipelined (7.5 ns tCD2, 12 ns tCYC2) for burst throughput, or flow-through (18 ns tCD1, 22 ns tCYC1) for minimal latency. Separate upper-byte (UB/LB) and lower-byte controls enable multiplexed bus compatibility and byte-selective writes without external logic.

Key Specifications

Pinout & Package

70V9289L7PFG is housed in a 128-pin Thin Quad Flatpack (TQFP) with 0.4 mm pitch, body dimensions 14 mm × 20 mm × 1.4 mm. All VDD pins require connection to 3.3 V supply; all VSS pins must be grounded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-7AXC and AS7C362000B-7TIN, the 70V9289L7PFG uniquely integrates pipelined timing, dual chip enables for hardware-based depth expansion, and an on-chip address counter - reducing host processor load and PCB routing complexity in high-performance real-time systems.

Availability

70V9289L7PFG is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motor control, and aerospace avionics requiring stable component supply and long-term obsolescence mitigation.

Supply support for 70V9289L7PFG 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 power solutions for communications and computing markets.

The 70V9289L7PFG belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for deterministic, low-latency memory sharing between heterogeneous processors in real-time embedded systems.

FAQ

What is the maximum operating frequency of the 70V9289L7PFG in pipelined mode?

The 70V9289L7PFG supports up to 83 MHz operation in pipelined output mode, corresponding to a 12 ns clock cycle time (tCYC2) as specified in the AC Electrical Characteristics table. This frequency applies independently to both left and right ports when FT/PIPE = VIH, and is guaranteed across the industrial temperature range (–40°C to +85°C) at VDD = 3.3 V ± 0.3 V. The 70V9289L7PFG achieves this performance using registered inputs and self-timed write logic.

Does the 70V9289L7PFG support independent clock domains for left and right ports?

Yes, the 70V9289L7PFG supports fully independent clock domains via dedicated CLKL and CLKR inputs. Each port operates synchronously to its respective clock, with all registers (address, data, control) triggered on the rising edge. This enables true asynchronous operation - for example, the left port can run at 66 MHz while the right port runs at 83 MHz - without cross-port timing dependencies. The 70V9289L7PFG datasheet confirms this in the Functional Description and Timing Waveform sections.

How does the address counter function in the 70V9289L7PFG, and what signals control it?

The 70V9289L7PFG includes an internal address counter controlled by CNTENL/CNTRSTL (left) and CNTENR/CNTRSTR (right). When CNTEN = VIL on the rising CLK edge, the counter advances automatically; CNTRST = VIL resets it to address 0. ADS enables loading of external addresses into the counter. This feature allows burst-mode sequential access without host CPU intervention - critical for DMA-driven applications. The 70V9289L7PFG truth table and Timing Waveform of Read with Address Counter Advance confirm this behavior.

Can the 70V9289L7PFG be used for depth expansion, and what pins enable this?

Yes, the 70V9289L7PFG supports hardware-based depth expansion using its dual chip enables CE0 and CE1 per port. As shown in Truth Table I and the Depth Expansion diagram, asserting CE0 = VIL and CE1 = VIH activates a port; cascading multiple devices with decoded higher-order address bits on CE0/CE1 eliminates need for external logic. This capability is explicitly documented for the 70V9289L7PFG in the "Depth and Width Expansion" section and functional block diagram.

Is the 70V9289L7PFG pin-compatible with other members of the IDT70V9x89 family?

The 70V9289L7PFG shares the same 128-pin TQFP package and pinout as IDT70V9389L7PFG, differing only in memory width configuration (64K × 18 vs. 64K × 16) and internal I/O mapping. Pin compatibility is confirmed by identical pin configuration diagrams (PK128 package) and matching signal names (e.g., I/O0L–I/O17L, A0L–A15L) in the datasheet. However, firmware must account for the 18-bit data path when migrating from 16-bit variants.