Renesas 70V9389L9PRF

Overview

70V9389L9PRF 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 address on independent left and right ports. It delivers pipelined output mode with 12 ns cycle time (83 MHz), 7.5 ns clock-to-data access, and industrial temperature operation (–40°C to +85°C). Used in real-time DSP co-processing, network packet buffering, and FPGA-based protocol bridging where deterministic latency and port independence are critical.

For engineers reviewing the 70V9389L9PRF datasheet, 70V9389L9PRF pinout, 70V9389L9PRF application, or 70V9389L9PRF equivalent, key selection considerations include pipelined vs. flow-through output timing, dual chip enable depth expansion capability, LVTTL-compatible 3.3V-only supply, separate upper/lower byte controls for multiplexed bus matching, and counter-enable/reset support for burst-addressing applications.

Technical Context

The 70V9389L9PRF implements fully synchronous dual-port operation with register-controlled address, data, and control inputs-requiring only 4 ns setup and 0 ns hold relative to CLK. 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 configurable output modes via FT/PIPE pins: pipelined (12 ns cycle, 7.5 ns tCD2) for maximum throughput in burst transfers, and flow-through (22 ns cycle, 18 ns tCD1) for minimal latency in single-cycle reads. Dual chip enables (CE0/CE1 per port) allow seamless depth expansion without external logic, while independent UBR/LBR and UBL/LBL enable byte-level granularity on both ports.

Key Specifications

Pinout & Package

70V9389L9PRF is housed in a 128-pin Thin Quad Flatpack (TQFP) package measuring 14 mm × 20 mm × 1.4 mm, with exposed thermal pad (not electrically connected). All VDD pins require local 3.3 V decoupling; all VSS pins must be solidly grounded. Pin functions are strictly symmetric across left (L) and right (R) ports.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1370D-133AXC and AS7C33128PFSIG, the 70V9389L9PRF uniquely combines synchronous pipelined operation, per-port asynchronous OE, and dual CE-based depth expansion-making it optimal for FPGA/DSP co-processor designs requiring deterministic timing and minimal glue logic.

Availability

70V9389L9PRF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and FPGA-based protocol bridging requiring stable component supply across extended product lifecycles.

Supply support for 70V9389L9PRF 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas in 2019. Known for high-performance, low-jitter timing and synchronous memory products.

The 70V9389L9PRF belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for real-time embedded systems demanding concurrent, deterministic memory access between heterogeneous processors or peripherals.

FAQ

What is the maximum operating frequency of the 70V9389L9PRF in pipelined mode?

The 70V9389L9PRF supports up to 83 MHz operation in pipelined output mode, corresponding to a 12 ns clock cycle time (tCYC2). This specification is guaranteed over the full industrial temperature range (–40°C to +85°C) and 3.3 V ±0.3 V supply. The 70V9389L9PRF achieves this performance through fully registered inputs and an optimized internal pipeline stage that delivers data on the second clock edge after address assertion.

Does the 70V9389L9PRF support independent byte-write control on each port?

Yes, the 70V9389L9PRF provides independent upper-byte (UB) and lower-byte (LB) controls per port-UBL/LBL on the left port and UBR/LBR on the right port. Each pair enables selective 9-bit writes to either half of the 18-bit data bus, allowing efficient 16-bit bus alignment and eliminating the need for external byte-mask logic in systems with mixed-width peripherals.

Can the 70V9389L9PRF be used for depth expansion without external logic?

Yes, the 70V9389L9PRF integrates dual chip enables (CE0 and CE1) per port, enabling direct depth expansion-for example, stacking two devices to create a 128K × 18-bit memory space-using only address MSB decoding. No external gates or CPLDs are needed, as CE0=LOW + CE1=HIGH selects a device, while CE0=HIGH + CE1=LOW places it in low-power standby.

What is the purpose of the FT/PIPE pin on the 70V9389L9PRF?

The FT/PIPE pin (separate FT/PIPEL and FT/PIPER signals) configures the output register behavior per port: logic LOW selects flow-through mode (data appears at outputs after tCD1 delay, ~18 ns), while logic HIGH enables pipelined mode (data appears after tCD2, ~7.5 ns, but with one-cycle latency). This lets designers optimize the 70V9389L9PRF for either lowest latency or highest throughput without hardware changes.

Is the 70V9389L9PRF compatible with LVTTL voltage levels?

Yes, the 70V9389L9PRF is fully LVTTL-compatible, operating from a single 3.3 V ±0.3 V supply and accepting input voltages where VIH ≥ 2.0 V and VIL ≤ 0.8 V. Its outputs drive to VOH ≥ 2.4 V (at –4 mA) and VOL ≤ 0.4 V (at +4 mA), meeting LVTTL specifications and enabling direct interfacing with FPGAs, DSPs, and microcontrollers without level-shifting circuitry.