Renesas 70V9279L7PRFI

Overview

70V9279L7PRFI from IDT (now part of Renesas) is a high-speed, 32K × 16-bit synchronous dual-port static RAM with true dual-ported memory cells enabling simultaneous read/write access to the same address from left and right ports, 10 ns pipelined cycle time at 100 MHz, LVTTL-compatible 3.3 V ±0.3 V supply, and industrial temperature range (–40°C to +85°C). It serves as shared memory buffer in real-time DSP systems requiring deterministic latency between processing cores.

For engineers reviewing the 70V9279L7PRFI datasheet, 70V9279L7PRFI pinout, 70V9279L7PRFI application, or 70V9279L7PRFI equivalent, key selection criteria include pipelined vs. flow-through output mode timing, port-to-port delay (tCWDD ≤ 35 ns), dual chip enable for depth expansion, counter-enable/counter-reset functionality, and 128-pin TQFP package compatibility with high-density PCB layouts.

Technical Context

This device implements fully synchronous operation on both ports with 4 ns setup and 1 ns hold on all control, address, and data inputs, supported by input registers for address, data, and control signals. Its dual-port architecture uses independent clock domains (CLKL/CLKR), separate upper- and lower-byte controls (UBL/LBL, UBR/LBR), and asynchronous OE per port - enabling concurrent burst transfers without arbitration logic.

The internal address counter (enabled via CNTENL/CNTENR) supports auto-incrementing reads/writes when ADS is deasserted, while FT/PIPEL and FT/PIPER pins configure each port independently for flow-through (tCD1 ≤ 20 ns) or pipelined (tCD2 ≤ 9 ns) output modes. Power management includes four standby current states (ISB1–ISB4), with full CMOS-level standby drawing only 0.4 mA typical.

Key Specifications

Pinout & Package

70V9279L7PRFI is housed in a 128-pin TQFP package (JEDEC MO-152AC) with exposed thermal pad, 14 mm × 20 mm footprint, and 0.4 mm lead pitch. 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 CY7C028V-15AXC and AS7C33256P-10BIN, the 70V9279L7PRFI uniquely combines 32K × 16 density, 10 ns pipelined cycle time, industrial temperature rating, and per-port synchronous clocking - making it optimal for new 3.3 V, high-determinism embedded designs where register-based timing closure is mandatory.

Availability

70V9279L7PRFI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial-grade qualification.

Supply support for 70V9279L7PRFI 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, is a fabless semiconductor company specializing in high-performance timing, memory interface, and RF solutions for communications and computing markets.

The 70V9279L7PRFI belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems where concurrent access and precise timing control are essential.

FAQ

What is the maximum operating frequency of the 70V9279L7PRFI in pipelined mode?

The 70V9279L7PRFI supports up to 100 MHz operation in pipelined output mode, corresponding to a 10 ns clock cycle time (tCYC2). This specification applies across the full industrial temperature range (–40°C to +85°C) and 3.3 V ±0.3 V supply, as verified in AC Electrical Characteristics Table 11a for the X7 speed grade. The 70V9279L7PRFI achieves this with 4 ns setup and 1 ns hold timing margins on all synchronous inputs.

Does the 70V9279L7PRFI support independent output modes on left and right ports?

Yes, the 70V9279L7PRFI supports independent output mode configuration: FT/PIPEL sets the left port (L) and FT/PIPER sets the right port (R). When driven high, each port operates in pipelined mode (tCD2 ≤ 9 ns); when low, flow-through mode (tCD1 ≤ 20 ns) is active. This allows heterogeneous system integration - for example, connecting a high-speed FPGA (pipelined) to a legacy microcontroller (flow-through) using a single 70V9279L7PRFI.

How does the address counter function in the 70V9279L7PRFI, and what signals control it?

The 70V9279L7PRFI integrates a per-port address counter controlled by CNTENL/CNTENR (enable) and CNTRSTL/CNTRSTR (reset). When CNTENX = VIL on the rising CLKX edge, the counter advances regardless of CE or OE state. ADSX = VIH selects internal counter output; ADSX = VIL loads external address. Reset occurs asynchronously when CNTRSTX = VIL. This eliminates external counter logic in sequential buffer applications - a key feature confirmed in Truth Table III and Timing Waveform drw 15–18.

What are the power consumption characteristics of the 70V9279L7PRFI in full standby mode?

In full standby mode (ISB3), where both ports are disabled with CMOS-level inputs (CE0/CE1 > VDD – 0.2 V and all inputs at rail), the 70V9279L7PRFI draws only 0.4 mA typical (400 µA) at VDD = 3.3 V and TA = 25°C. This ultra-low quiescent current is specified in DC Electrical Characteristics Table 9a and enables energy-efficient operation in always-on industrial gateways and battery-buffered systems where the 70V9279L7PRFI remains powered but inactive between bursts.

Is the 70V9279L7PRFI pin-compatible with other members of the IDT70V9279/69 family?

Yes, the 70V9279L7PRFI shares identical 128-pin TQFP pinout and signal mapping with all variants in the IDT70V9279/69 family (e.g., 70V9279S7PRFI, 70V9279L9PRFI), differing only in speed grade (X6/X7/X9), power rating (S/L), and temperature grade. Pin compatibility is confirmed in the "Pin Configuration" section (page 2) and "Pin Names" table (page 3) of the datasheet, which explicitly lists identical pin assignments across the family - enabling drop-in replacement within the same speed/temperature bin.