Renesas 709289L9PFI8

Overview

IDT709289L9PFI8 from Integrated Device Technology is a high-speed 64K × 16-bit synchronous pipelined dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address from both ports, 9 ns max clock-to-data access in pipelined mode, industrial temperature range (–40°C to +85°C), and TTL-compatible 5 V ±10% supply - used in real-time DSP co-processing, FPGA-based protocol bridging, and redundant control systems requiring deterministic latency.

For engineers reviewing the IDT709289L9PFI8 datasheet, IDT709289L9PFI8 pinout, IDT709289L9PFI8 application, or IDT709289L9PFI8 equivalent, key selection criteria include pipelined vs. flow-through output timing, dual-port depth expansion capability via CE0/CE1 pairing, byte-selectable write control (UB/LB), and industrial-grade reliability for embedded control subsystems.

Technical Context

This device implements fully synchronous operation on both left and right ports with registered address, data, and control inputs-achieving 4 ns setup and 0 ns hold times relative to CLK. Its dual independent address counters (CNTEN/CNTRST per port) support automatic address incrementing or external address strobing (ADSL/ADSR), enabling burst-mode sequential access without host CPU intervention.

The memory core uses true dual-ported SRAM cells with self-timed write logic, eliminating external write-pulse generation. Output mode (flow-through or pipelined) is selected per port via FT/PIPEL and FT/PIPER pins, directly affecting tCD (7.5 ns min in pipelined mode) and tCYC (15 ns min for 66.7 MHz operation).

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm. All V_CC and GND pins must be connected per datasheet Note 1–2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AC and R1EX24064ASG, the IDT709289L9PFI8 uniquely combines industrial temperature support, 5 V TTL compatibility, and registered synchronous timing - making it the only option for upgrading legacy 5 V control systems to deterministic dual-port buffering without redesigning power or signal integrity.

Availability

IDT709289L9PFI8 is available at Aetrix Electronics and suitable for real-time DSP co-processing, FPGA-based protocol bridging, and redundant control subsystems requiring stable component supply across extended product lifecycles.

Supply support for IDT709289L9PFI8 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), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, and RF solutions for communications, computing, and industrial markets.

The IDT709289 product line was designed for high-reliability embedded systems requiring deterministic, low-latency dual-port memory - particularly targeting telecom infrastructure, industrial automation, and military/aerospace avionics.

FAQ

What is the maximum operating frequency of the IDT709289L9PFI8 in pipelined mode?

The IDT709289L9PFI8 supports up to 66.7 MHz in pipelined output mode, derived from its 15 ns maximum clock cycle time (tCYC2). This frequency is guaranteed across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply, with all timing parameters validated under worst-case conditions per datasheet Table 11.

Does the IDT709289L9PFI8 support independent address counters on both ports?

Yes, the IDT709289L9PFI8 provides fully independent address counters on left and right ports, controlled by dedicated CNTENL/CNTRSTL and CNTENR/CNTRSTR pins. Each counter advances on the rising edge of its respective clock when CNTEN = VIL, enabling autonomous burst transfers without cross-port interference - a feature confirmed in Truth Table II and Figure 15 of the datasheet.

How does the dual chip enable scheme (CE0/CE1) work for depth expansion with the IDT709289L9PFI8?

The IDT709289L9PFI8 uses CE0X = VIL and CE1X = VIH to activate port X (left or right); setting CE0X = VIH or CE1X = VIL places that port in low-power standby. For depth expansion, multiple devices are stacked with identical address/data buses, and CE0/CE1 pairs are decoded externally to select individual units - eliminating need for additional logic gates as stated in the "Depth and Width Expansion" section (page 14).

Can the IDT709289L9PFI8 operate with different output modes on left and right ports simultaneously?

Yes, the IDT709289L9PFI8 allows independent output mode selection per port: FT/PIPEL controls the left port and FT/PIPER controls the right port. When FT/PIPEL = VIL and FT/PIPER = VIH, the left port operates in flow-through mode (tCD1 ≤ 20 ns) while the right port runs in pipelined mode (tCD2 ≤ 9 ns) - a configuration explicitly supported and timed in datasheet Figures 7–8 and Table 11.

What is the standby current specification for the IDT709289L9PFI8 under industrial conditions?

Under industrial conditions (–40°C to +85°C), the IDT709289L9PFI8 specifies ISB2 ≤ 195 mA max when one port is active (CE0X = VIL, CE1X = VIH) and outputs are disabled. This value is measured at f = fMAX with TTL-level inputs, and appears in Table 9 of the datasheet under the "709289L9" speed column - confirming suitability for thermally constrained industrial deployments.