Renesas 70V9289L7PRF

Overview

70V9289L7PRF from Integrated Device Technology is a high-speed 3.3V 64K × 18-bit synchronous dual-port pipelined static RAM with true dual-ported memory cells enabling simultaneous read/write access to the same address, 12ns cycle time in pipelined mode, 7.5ns clock-to-data access, and industrial temperature support (–40°C to +85°C). It serves as on-chip buffer memory in real-time DSP systems requiring deterministic latency between two independent data paths.

For engineers reviewing the 70V9289L7PRF datasheet, 70V9289L7PRF pinout, 70V9289L7PRF application, or 70V9289L7PRF equivalent, key selection criteria include pipelined vs. flow-through output timing, dual chip enable depth expansion capability, LVTTL-compatible 3.3V operation, and separate upper/lower byte controls for multiplexed bus compatibility.

Technical Context

The 70V9289L7PRF implements fully synchronous operation on both ports with registered address, data, and control inputs-requiring only 4ns setup and 0ns hold relative to the rising clock edge. Its self-timed write architecture decouples internal write pulse generation from clock edge timing, enabling fast cycle times without external timing constraints.

It supports two distinct output modes: pipelined (FT/PIPE = VIH), delivering 7.5ns clock-to-data-out with 12ns minimum cycle time at 83MHz, and flow-through (FT/PIPE = VIL), offering 18ns clock-to-data-out with 22ns minimum cycle time. Dual independent address counters per port are controlled via ADS, CNTEN, and CNTRST signals for burst-addressing applications.

Key Specifications

Pinout & Package

70V9289L7PRF is housed in a 128-pin Thin Quad Flatpack (TQFP) package measuring 14 mm × 20 mm × 1.4 mm, with 32 dedicated I/O pins (I/O0L–I/O17L and I/O0R–I/O17R), dual clock inputs (CLKL/CLKR), and separate control sets for left and right ports including CE0/CE1, R/W, OE, UB/LB, ADS, CNTEN, and CNTRST.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-12AXC and AS7C36256PFSIG, the 70V9289L7PRF uniquely combines pipelined timing, dual address counters, and dual chip enables-making it optimal for real-time systems requiring autonomous burst transfers and scalable memory depth without external decode logic.

Availability

70V9289L7PRF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, avionics data concentrators, and DSP co-processing applications requiring stable component supply across extended product lifecycles.

Supply support for 70V9289L7PRF 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V9289L7PRF belongs to IDT's high-speed synchronous dual-port SRAM product line, engineered specifically for deterministic-latency applications where two independent processors or data streams require concurrent, conflict-free access to shared memory resources.

FAQ

What is the maximum operating frequency of the 70V9289L7PRF in pipelined mode?

The 70V9289L7PRF supports a maximum operating frequency of 83 MHz in pipelined output mode, derived from its guaranteed 12 ns minimum clock cycle time (tCYC2). This timing is validated across the full industrial temperature range (–40°C to +85°C) and 3.3 V ± 0.3 V supply, making the 70V9289L7PRF suitable for high-throughput real-time systems such as telecom line cards and DSP accelerators.

Does the 70V9289L7PRF support independent output modes on left and right ports?

Yes, the 70V9289L7PRF supports independent output mode selection per port via the FT/PIPEL and FT/PIPER pins. Setting FT/PIPEL = VIH configures the left port for pipelined operation (7.5 ns clock-to-data), while FT/PIPER = VIL configures the right port for flow-through mode (18 ns clock-to-data). This flexibility allows mixed-timing system architectures-for example, connecting a high-speed FPGA to one port and a slower microcontroller to the other-without compromising performance on either interface.

How does the dual chip enable (CE0/CE1) scheme enable depth expansion without external logic?

The 70V9289L7PRF uses dual chip enables per port (CE0L/CE1L and CE0R/CE1R) to implement depth expansion through simple address-line decoding. For example, two 70V9289L7PRF devices can be stacked to form a 128K × 18-bit memory: A16 selects between devices (CE0L = A16, CE1L = /A16), while all other address and control lines connect in parallel. No external gates or CPLDs are needed because CE0 = VIH or CE1 = VIL fully deselects the port-eliminating bus contention and simplifying PCB layout for scalable memory subsystems.

What is the function of the ADS pin on the 70V9289L7PRF, and how does it interact with the address counter?

The ADS (Address Strobe Enable) pin on the 70V9289L7PRF controls whether the rising edge of CLK loads the external address bus (ADS = VIL) or advances the internal address counter (ADS = VIH). When ADS = VIL, the current A0–A15 value is latched into the address register. When ADS = VIH and CNTEN = VIL, the counter increments autonomously-enabling burst transfers without continuous host address updates. This behavior is confirmed in Truth Table II and timing diagrams on pages 7 and 15 of the datasheet for the 70V9289L7PRF.

Is the 70V9289L7PRF pin-compatible with other members of the IDT70V9x89 family?

Yes, the 70V9289L7PRF shares identical pinout and package (128-pin TQFP) with the 70V9389L7PRF and 70V9289L9PRF variants. All share the same signal mapping, power/ground pin locations, and mechanical footprint-allowing drop-in replacement for speed or temperature grade changes (e.g., upgrading from commercial to industrial temp). However, functional equivalence requires verification of timing specs: the "7" suffix denotes 7.5/9/12 ns access timing, while "9" indicates 9 ns industrial-grade timing.