Renesas 70V9389L7PRF8

Overview

70V9389L7PRF8 from Integrated Device Technology is a high-speed, 3.3V, 64K × 18/16-bit synchronous dual-port pipelined static RAM with true dual-ported memory cells enabling simultaneous read/write access to the same address on left and right ports, 12 ns cycle time in pipelined mode, 7.5 ns clock-to-data (tCD2), and industrial temperature support (–40°C to +85°C). It serves as shared memory buffer in real-time DSP systems requiring deterministic latency between two independent bus masters.

For engineers reviewing the 70V9389L7PRF8 datasheet, 70V9389L7PRF8 pinout, 70V9389L7PRF8 application, or 70V9389L7PRF8 equivalent, key selection criteria include pipelined vs. flow-through output mode configuration via FT/PIPE pins, dual chip enable depth expansion capability, separate upper/lower byte controls for 16-bit bus matching, and verified 83 MHz operation at 12 ns cycle time under industrial conditions.

Technical Context

The 70V9389L7PRF8 implements fully synchronous dual-port architecture with input registers on all address, data, and control lines-ensuring 4 ns setup and 0 ns hold timing relative to CLK. Its self-timed write pulse decouples internal write completion from clock edge timing, enabling fast cycle times without external wait-state logic.

It supports two distinct output modes: pipelined (FT/PIPE = VIH) delivers 7.5 ns tCD2 with 1-cycle latency, while flow-through (FT/PIPE = VIL) yields 18 ns tCD1 with zero-latency output. Address counter functionality-enabled by CNTEN and reset by CNTRST-is fully synchronous and operates independently per port, supporting burst-addressing in DMA-driven applications.

Key Specifications

Pinout & Package

70V9389L7PRF8 is housed in a 128-pin Thin Quad Flatpack (TQFP) with 0.4 mm pitch, body size 14 mm × 20 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 dual-port SRAM applications.

Compared with CY7C1375BV33-100AXC and AS7C361024B-12JIN, the 70V9389L7PRF8 uniquely delivers pipelined + flow-through mode flexibility, integrated address counter, and guaranteed 7.5 ns tCD2-making it optimal for latency-critical, burst-oriented embedded systems where timing predictability and feature integration reduce BOM count.

Availability

70V9389L7PRF8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, real-time DSP interfacing, and redundant PLC communication modules requiring stable component supply and long-term industrial-grade availability.

Supply support for 70V9389L7PRF8 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 high-performance interconnect solutions for communications, computing, and industrial markets.

The 70V9389L7PRF8 belongs to IDT's high-speed synchronous dual-port SRAM product line, engineered specifically for deterministic, low-latency shared-memory architectures in real-time embedded systems demanding simultaneous multi-master access.

FAQ

What is the maximum operating frequency of the 70V9389L7PRF8 in pipelined mode?

The 70V9389L7PRF8 achieves 83 MHz operation in pipelined mode, derived from its 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, and applies to both left and right ports independently when FT/PIPE = VIH. The 70V9389L7PRF8 datasheet specifies tCYC2 = 12 ns (max) for the L7 speed grade, confirming this frequency ceiling under worst-case conditions.

Does the 70V9389L7PRF8 support true simultaneous read–write to the same memory location?

Yes, the 70V9389L7PRF8 uses true dual-ported memory cells that allow concurrent read and write operations to the exact same address-one port reading while the other writes-without collision, arbitration, or data corruption. This capability is explicitly confirmed in the Functional Block Diagram and Features section of the 70V9389L7PRF8 datasheet and is fundamental to its role in master–master interconnect applications.

How does the address counter function in the 70V9389L7PRF8, and what signals control it?

The 70V9389L7PRF8 integrates a synchronous address counter per port, controlled by CNTENL/CNTENR (enable) and CNTRSTL/CNTRSTR (reset) signals. When CNTEN = VIL on the rising CLK edge, the counter advances automatically; CNTRST = VIL resets it to address 0. Both functions operate independently per port and are detailed in Truth Table II and Timing Waveform 15 of the 70V9389L7PRF8 datasheet.

What is the power consumption of the 70V9389L7PRF8 in standby mode, and how is it achieved?

The 70V9389L7PRF8 draws just 0.4 mA typical (1.5 mW) in full standby mode (ISB3), achieved by driving both CE0 and CE1 to CMOS high levels (> VDD – 0.2 V) while holding all inputs static. This disables internal circuitry including clocks and I/O drivers. The 70V9389L7PRF8 datasheet confirms ISB3 = 0.4 mA (typ.) at VDD = 3.3 V and TA = 25°C, with identical specs maintained across the industrial temperature range.

Can the 70V9389L7PRF8 be used for depth expansion, and what pins enable this?

Yes, the 70V9389L7PRF8 supports seamless depth expansion using its dual chip enables CE0 and CE1 per port. As shown in Figure 4 of the 70V9389L7PRF8 datasheet, connecting A16 to CE1 of one device and CE0 of another allows 128K × 18 expansion without external logic. This configuration leverages the "deselected–power down" behavior defined in Truth Table I, ensuring no bus contention or power penalty during expansion.