Renesas 70V9079L9PF8

Overview

70V9079L9PF8 from IDT (now Renesas) is a high-speed 32K × 8-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, 12ns max clock-to-data access in industrial temperature range (–40°C to +85°C), LVTTL-compatible 3.3V ±0.3V operation, and pipelined or flow-through output mode selectable via FT/PIPE pin - used in real-time DSP inter-processor communication buffers and FPGA co-processor data exchange subsystems.

For engineers reviewing the 70V9079L9PF8 datasheet, 70V9079L9PF8 pinout, 70V9079L9PF8 application, or 70V9079L9PF8 equivalent, key selection criteria include synchronous dual-port timing compliance (tCYC2 = 20ns min for pipelined mode), industrial-grade standby current (ISB3 = 0.4mA typ), 100-pin TQFP package footprint, and address counter support for burst-mode sequential access without external address generation logic.

Technical Context

This device implements fully synchronous dual-port architecture with independent clocked registers on all address, data, and control inputs (4ns setup / 1ns hold), self-timed internal write pulse decoupled from clock edge timing, and asynchronous OE for flexible bus interfacing. The dual chip enables (CE0/CE1 per port) enable depth expansion without external logic.

It supports two configurable output modes: pipelined (7.5ns clock-to-data out, 83MHz operation) and flow-through (12ns max access), selected per port via dedicated FT/PIPE pins. Address counter functionality (CNTEN/CNTRST) allows automatic sequential addressing during burst transfers, reducing host controller overhead in packet buffering applications.

Key Specifications

Pinout & Package

70V9079L9PF8 is housed in a 100-pin TQFP package (14mm × 14mm × 1.4mm) with exposed thermal pad. Pin functions are strictly defined per port (Left/Right), including dual clock inputs (CLKL/CLKR), dual address strobes (ADSL/ADSR), and independent chip enables (CE0L/CE1L, CE0R/CE1R). A15R and A15L are no-connect (NC) for this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and AS7C33256PFS-15BIN, the 70V9079L9PF8 uniquely combines pipelined output mode, per-port address counters, and industrial-grade 12ns access - making it optimal for FPGA/DSP co-processing where burst automation and sub-20ns latency are mandatory.

Availability

70V9079L9PF8 is available at Aetrix Electronics and suitable for real-time DSP inter-processor buffers, FPGA-CPU co-processing interfaces, and automotive radar signal processing buffers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70V9079L9PF8 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 70V9079L9PF8 belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for deterministic, low-latency data exchange between heterogeneous processors in real-time embedded systems.

FAQ

What is the maximum operating frequency of the 70V9079L9PF8 in pipelined mode?

The 70V9079L9PF8 supports a minimum clock cycle time of 20ns in pipelined output mode, corresponding to a maximum operating frequency of 50MHz. This is specified over the full industrial temperature range (–40°C to +85°C) and is guaranteed by AC characterization - not just typical performance. The 70V9079L9PF8 achieves this using registered inputs and a self-timed write pulse, ensuring reliable timing closure in FPGA- or ASIC-based systems.

Does the 70V9079L9PF8 support depth expansion without external logic?

Yes, the 70V9079L9PF8 supports depth expansion without external logic via its dual chip enable architecture: CE0L/CE1L and CE0R/CE1R per port. When configured in depth-expansion mode, one device's CE0 is tied low while CE1 is high, and adjacent devices use complementary CE states - enabling seamless 64K, 96K, or larger memory maps using only the existing pinout. This capability is explicitly validated in the datasheet's Figure 4 and Truth Table I.

What is the function of the FT/PIPE pin on the 70V9079L9PF8?

The FT/PIPEL and FT/PIPER pins on the 70V9079L9PF8 independently configure the output mode for the left and right ports: VIH selects pipelined mode (1-cycle latency, 7.5ns clock-to-data, 50MHz operation), while VIL selects flow-through mode (0-cycle latency, 12ns max access). These are DC control signals - not sampled on clock edges - and must remain stable during operation to avoid metastability or undefined output behavior.

How does the address counter feature work on the 70V9079L9PF8?

The 70V9079L9PF8 implements independent address counters per port controlled by CNTENL/CNTRSTL (left) and CNTENR/CNTRSTR (right). When CNTEN = low on the rising clock edge, the internal address increments automatically - enabling burst transfers without host-provided addresses. CNTRST = low resets the counter to address 0. This feature is confirmed in Truth Table II and timing diagrams (Figures 14–17) for both pipelined and flow-through modes.

Is the 70V9079L9PF8 pin-compatible with the 70V9089L9PF8?

No, the 70V9079L9PF8 is not pin-compatible with the 70V9089L9PF8. While both use 100-pin TQFP packages, the 70V9079L9PF8 has A15R and A15L designated as no-connect (NC) pins - confirming its 32K × 8 organization - whereas the 70V9089L9PF8 uses A15 for full 64K addressing. This difference is explicitly noted in the datasheet's Pin Configurations section (Note 1) and functional block diagram.