Renesas 70V9279S7PRFI8

Overview

70V9279S7PRFI8 from IDT (now part of Renesas) is a high-speed, 32K × 16-bit synchronous dual-port SRAM 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 operation, and industrial temperature range (–40°C to +85°C). It serves as on-chip buffer memory in real-time digital signal processors, network packet switches, and FPGA-based protocol accelerators.

For engineers reviewing the 70V9279S7PRFI8 datasheet, 70V9279S7PRFI8 pinout, 70V9279S7PRFI8 application, or 70V9279S7PRFI8 equivalent, key selection considerations include pipelined vs. flow-through output mode timing, dual chip enable depth expansion capability, separate upper/lower byte controls for bus matching, counter-enabled burst addressing, and 128-pin TQFP package compatibility with high-density PCB layouts.

Technical Context

This device implements fully synchronous dual-port architecture with independent clock inputs (CLKL/CLKR), register-controlled address/data/control paths, and self-timed write logic enabling minimal setup/hold requirements (4 ns setup, 1 ns hold). Both ports support pipelined (6.5 ns clock-to-data out) and flow-through output modes selected per port via FT/PIPE pins.

It integrates address strobe (ADSL/ADSR), counter enable (CNTENL/CNTENR), and counter reset (CNTRSTL/CNTRSTR) functions for burst-mode sequential access, while separate upper-byte (UBL/UBR) and lower-byte (LBL/LBR) controls allow byte-level granularity on multiplexed buses. Power management includes four standby current modes (ISB1–ISB4) triggered by CMOS/TTL-level chip enables.

Key Specifications

Pinout & Package

70V9279S7PRFI8 is housed in a 128-pin TQFP package (PKG128) with exposed thermal pad, 0.4 mm pitch, and 14 mm × 20 mm footprint. All VDD pins require local decoupling; all VSS pins must be connected to ground plane for signal integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and AS7C33256B-10BIN, the 70V9279S7PRFI8 delivers superior real-time determinism via pipelined output mode and integrated address counter, while its dual chip enables and byte controls provide greater flexibility in scalable industrial and telecom architectures.

Availability

70V9279S7PRFI8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and FPGA-accelerated edge computing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for 70V9279S7PRFI8 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 70V9279S7PRFI8 belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for deterministic, low-latency data sharing between heterogeneous processors, FPGAs, and ASICs in real-time embedded systems.

FAQ

What is the maximum operating frequency of the 70V9279S7PRFI8 in pipelined mode?

The 70V9279S7PRFI8 supports 100 MHz operation in pipelined output mode, corresponding to a 10 ns clock cycle time (tCYC2). This is validated across the industrial temperature range (–40°C to +85°C) and 3.3 V ±0.3 V supply, making it suitable for high-throughput packet buffering and real-time DSP applications where deterministic latency is critical. The 70V9279S7PRFI8 achieves this with 6.5 ns clock-to-data-out timing.

Does the 70V9279S7PRFI8 support simultaneous read and write to the same memory address?

Yes, the 70V9279S7PRFI8 uses true dual-ported SRAM cells that permit simultaneous read from one port and write to the same address on the other port - a core feature confirmed in the functional block diagram and truth tables. This eliminates arbitration logic and enables zero-cycle handshaking in co-processor and FPGA-ASIC interconnects. The 70V9279S7PRFI8 maintains data integrity under this condition without requiring external synchronization.

How does the address counter function in the 70V9279S7PRFI8, and what triggers it?

The 70V9279S7PRFI8 includes independent left/right address counters enabled by CNTENL/CNTENR. When CNTEN = VIL on the rising edge of CLK, the counter advances regardless of CE0/CE1 state. ADS = VIH selects internal counter address; ADS = VIL loads external address. CNTRST = VIL resets counter to 0x0000. This hardware counter reduces CPU load in burst transfers - a key capability of the 70V9279S7PRFI8 not found in basic SRAMs.

What are the power-saving modes supported by the 70V9279S7PRFI8, and how are they activated?

The 70V9279S7PRFI8 offers four standby modes: ISB1 (both ports TTL-disabled), ISB2 (one port active), ISB3 (full CMOS standby, 0.4 mA typ), and ISB4 (one port CMOS-standby). Activation is controlled by CE0/CE1 voltage levels relative to VDD thresholds (e.g., CE0 < 0.2 V & CE1 > VDD – 0.2 V). These modes are documented in Table 9a/b and enable granular power management - a distinguishing feature of the 70V9279S7PRFI8 versus generic SRAMs.

Is the 70V9279S7PRFI8 pin-compatible with other members of the IDT70V92xx family?

The 70V9279S7PRFI8 shares the same 128-pin TQFP package and core pinout with IDT70V9269 and IDT70V9279 variants, but A14L/A14R are No Connect (NC) on IDT70V9269 per Note 1 in the datasheet. Functionally, all share identical control, data, and clock pin assignments. However, speed grades (X6/X7/X9/X12/X15) and power variants (S/L) differ in timing parameters - the 70V9279S7PRFI8 is rated for industrial temp and 10 ns pipelined operation.