Renesas 70V9389L9PRFI

Overview

70V9389L9PRFI from IDT (now part of Renesas) is a high-speed, synchronous, pipelined dual-port static RAM with 64K × 18-bit (or 64K × 16-bit) organization, operating on a single 3.3V ±0.3V supply. It supports simultaneous independent read/write access on left and right ports, features flow-through or pipelined output modes, and delivers 15ns clock cycle time in pipelined mode for 66.7MHz operation - used in real-time packet buffering, FPGA co-processor memory, and telecom line-card data exchange.

For engineers reviewing the 70V9389L9PRFI datasheet, 70V9389L9PRFI pinout, 70V9389L9PRFI application, or 70V9389L9PRFI equivalent, key selection criteria include industrial temperature support (–40°C to +85°C), dual chip enables for seamless depth expansion, separate upper/lower byte controls for bus matching, and verified 7.5ns pipelined clock-to-data timing at 3.3V.

Technical Context

This device implements fully synchronous dual-port architecture with registered address, data, and control inputs on both ports - all latched on the rising edge of CLKL/CLKR. Its self-timed write pulse decouples internal write completion from clock edge timing, enabling minimal cycle time without external wait-state logic.

The integrated address counter (enabled via CNTENL/CNTENR and reset via CNTRSTL/CNTRSTR) supports burst-mode sequential access, while FT/PIPEL and FT/PIPER pins independently configure output latency per port. Dual CE0/CE1 per port allow selective power-down of either port's logic, achieving 0.4mA full-standby current under CMOS-level inactive conditions.

Key Specifications

Pinout & Package

70V9389L9PRFI is housed in a 128-pin Thin Quad Flatpack (TQFP) with 0.4mm pitch, body size 14mm × 20mm × 1.4mm. All VDD (pins 20, 49, 65, 84, 100, 111) and VSS (pins 19, 48, 64, 83, 99, 110) must be externally decoupled. Pin functions are strictly symmetric across left/right ports.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and AS7C362000B-15JIN, the 70V9389L9PRFI uniquely combines industrial temperature rating, integrated address counter, and symmetrical 128-pin TQFP packaging - making it the only option supporting robust burst-mode operation in harsh environments without layout redesign.

Availability

70V9389L9PRFI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and medical imaging systems requiring stable component supply across extended product lifecycles.

Supply support for 70V9389L9PRFI 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, specialized in high-performance timing, memory, and interface ICs for communications and computing infrastructure.

The 70V9389L9PRFI belongs to IDT's high-speed synchronous dual-port SRAM product line, engineered for deterministic, low-latency memory sharing between heterogeneous processors, FPGAs, and ASICs in real-time systems.

FAQ

What is the maximum operating frequency of the 70V9389L9PRFI in pipelined mode?

The 70V9389L9PRFI achieves a 15ns clock cycle time in pipelined mode (FT/PIPE = VIH), corresponding to a maximum operating frequency of 66.7MHz. This is guaranteed across the full industrial temperature range (–40°C to +85°C) and 3.3V ±0.3V supply, with tCD2 ≤ 9ns clock-to-data-out delay. The 70V9389L9PRFI datasheet specifies this performance under worst-case conditions, not typical-only values.

Does the 70V9389L9PRFI support true simultaneous access to the same memory location from both ports?

Yes, the 70V9389L9PRFI uses true dual-ported memory cells that permit concurrent read and write operations to the identical address location - one port reading while the other writes. This capability is intrinsic to its cell architecture and does not require arbitration logic, enabling lock-free data exchange in real-time inter-processor communication scenarios using the 70V9389L9PRFI.

How does the address counter function work on the 70V9389L9PRFI?

The 70V9389L9PRFI integrates independent address counters on each port, controlled by CNTENL/CNTENR (enable) and CNTRSTL/CNTRSTR (reset). When CNTEN = VIL on the rising CLK edge, the counter advances automatically - eliminating external increment logic. Reset forces the counter to address 0. This feature is validated in the 70V9389L9PRFI truth table and timing waveforms for burst-mode sequential access.

What is the standby power consumption of the 70V9389L9PRFI?

The 70V9389L9PRFI draws 0.4mA typical (2mA max) full-standby current (ISB3) when both ports are disabled via CE0/CE1 at CMOS levels (CE > VDD–0.2V) and all inputs held at rails. This ultra-low quiescent draw is confirmed in the DC Electrical Characteristics table of the 70V9389L9PRFI datasheet and enables energy-efficient idle states in battery-backed or thermally constrained systems.

Can the 70V9389L9PRFI be used for depth expansion without external logic?

Yes - the 70V9389L9PRFI provides dual chip enables (CE0 and CE1) per port, allowing straightforward depth expansion. For example, two devices can be stacked using A16 as a bank select: one device responds when A16 = 0 (CE0L = VIL, CE1L = VIH), the other when A16 = 1 (CE0L = VIH, CE1L = VIL). This configuration is explicitly illustrated in the 70V9389L9PRFI application note and requires no additional decoding logic.