Renesas 70V9279L7PRFI8

Overview

70V9279L7PRFI8 from IDT (now 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 is used in real-time inter-processor communication, FPGA co-processing buffers, and telecom packet buffering where deterministic latency and port independence are critical.

For engineers reviewing the 70V9279L7PRFI8 datasheet, 70V9279L7PRFI8 pinout, 70V9279L7PRFI8 application, or 70V9279L7PRFI8 equivalent, key selection criteria include pipelined vs. flow-through output mode timing, dual chip enable depth expansion capability, separate upper/lower byte controls for bus matching, counter-enable address auto-increment functionality, and industrial-grade power-down current (1.32 mW standby).

Technical Context

This device implements fully synchronous dual-port architecture with independent clock inputs (CLKL/CLKR), registered address/data/control paths, and 4 ns setup / 1 ns hold timing on all inputs. It supports two distinct output modes-flow-through (tCD1 ≤ 20 ns) and pipelined (tCD2 ≤ 9 ns)-selected per port via FT/PIPE pins, enabling optimization for either low-latency or high-throughput system designs.

The memory integrates dedicated address counters per port with ADS strobe, CNTEN enable, and CNTRST reset functions, allowing burst-mode sequential access without external address generation logic. Dual CE0/CE1 enables support depth expansion without additional decoding logic, while UBL/LBL and OEL/OER provide byte-level granularity and output control per port.

Key Specifications

Pinout & Package

70V9279L7PRFI8 is housed in a 128-pin Thin Quad Flatpack (TQFP) package with exposed thermal pad (PKG128). Pin assignments are symmetric for left/right ports, supporting identical interface layout on PCBs for both sides.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and IS61WV102416BLL-10MLI, the 70V9279L7PRFI8 delivers superior timing performance (10 ns pipelined), integrated address automation, and flexible dual CE expansion - making it optimal for new high-speed, multi-domain embedded systems where determinism and integration reduce system-level complexity.

Availability

70V9279L7PRFI8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and avionics subsystems requiring stable component supply, long-term lifecycle assurance, and industrial-temperature qualified memory.

Supply support for 70V9279L7PRFI8 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, and interface solutions for communications, computing, and industrial markets.

The 70V9279L7PRFI8 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 with strict timing and reliability requirements.

FAQ

What is the maximum operating frequency of the 70V9279L7PRFI8 in pipelined mode?

The 70V9279L7PRFI8 supports up to 100 MHz operation in pipelined output mode, corresponding to a 10 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, with tCD2 ≤ 9 ns clock-to-data valid delay ensuring reliable high-speed data capture.

Does the 70V9279L7PRFI8 support independent output modes on left and right ports?

Yes, the 70V9279L7PRFI8 supports independent configuration: FT/PIPEL sets left port mode (flow-through or pipelined), and FT/PIPER sets right port mode. This allows one port to prioritize low latency (flow-through) while the other maximizes throughput (pipelined), enabling asymmetric system architectures such as CPU-FPGA interfaces with differing timing constraints.

How does the address counter function in the 70V9279L7PRFI8, and what signals control it?

The 70V9279L7PRFI8 integrates a 15-bit address counter per port, controlled by ADSX (address strobe), CNTENX (counter enable), and CNTRSTX (counter reset). When ADSX = low and CNTENX = low on a rising clock edge, the internal address increments automatically. CNTRSTX = low resets the counter to address 0 - eliminating need for external counter logic in burst-transfer applications.

What is the standby current consumption of the 70V9279L7PRFI8, and how is low power achieved?

The 70V9279L7PRFI8 achieves 1.32 mW typical standby power (ISB3) by disabling internal circuitry of each port when both CE0X and CE1X are deasserted (high). This automatic power-down is per-port, so one port can remain active while the other enters ultra-low-power state - critical for battery-backed or thermally constrained industrial systems.

Can the 70V9279L7PRFI8 be used for depth expansion beyond 32K × 16, and how is it implemented?

Yes, the 70V9279L7PRFI8 supports depth expansion using its dual chip enables (CE0X and CE1X). By tying CE0 of one device to CE1 of the next and using a single higher-order address bit to select between them, designers can construct 64K × 16 or larger configurations without external decoding logic - directly leveraging the device's built-in CE architecture as specified in the functional description and truth tables.