Renesas 709279L12PF8

Overview

709279L12PF8 from IDT is a high-speed 32K x 16-bit synchronous dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address from both ports, 12ns max clock-to-data access (pipelined mode), 20ns clock cycle time, and industrial temperature support (–40°C to +85°C) in a 100-pin TQFP package - used in real-time inter-processor communication and FPGA co-processor buffering.

For engineers reviewing the 709279L12PF8 datasheet, 709279L12PF8 pinout, 709279L12PF8 application, or 709279L12PF8 equivalent, key selection criteria include pipelined vs. flow-through output mode configuration via FT/PIPE pin, dual chip enable for depth expansion without external logic, and TTL-compatible 5V ±10% operation with separate upper/lower byte controls for multiplexed bus compatibility.

Technical Context

The 709279L12PF8 implements fully synchronous operation on both left and right ports, with all control, address, and data inputs registered on the rising edge of CLKL/CLKR, achieving 4ns setup and 1ns hold times. Its self-timed write architecture enables fast cycle time independent of clock edge timing.

It supports two configurable output modes: pipelined (FT/PIPE = VIH, 9ns tCD2, 20ns tCYC2) or flow-through (FT/PIPE = VIL, 25ns tCD1, 30ns tCYC1), and includes an address counter with CNTEN/CNTRST pins for burst-mode sequential addressing without external address generation.

Key Specifications

Pinout & Package

709279L12PF8 is housed in a 100-pin TQFP (PN100) package with 0.5mm pitch, 14mm × 14mm footprint, and 1.4mm max height. All VCC and GND pins must be connected per datasheet layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and IDT70V9279L15PF, the 709279L12PF8 delivers superior 67MHz sustained throughput and 1mW ultra-low standby power - making it optimal for thermally constrained, high-throughput inter-processor links where timing margin and power efficiency are jointly critical.

Availability

709279L12PF8 is available at Aetrix Electronics and suitable for inter-processor communication, FPGA co-processor buffering, and telecom line card memory requiring stable component supply, long-term lifecycle support, and industrial-grade reliability.

Supply support for 709279L12PF8 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) is a fabless semiconductor company specializing in high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.

The IDT709279 family was designed specifically for deterministic, low-latency dual-processor and FPGA-ASIC bridging applications - emphasizing simultaneous access, pipelined throughput, and industrial temperature resilience.

FAQ

What is the maximum operating frequency of the 709279L12PF8 in pipelined mode?

The 709279L12PF8 supports up to 67MHz operation in pipelined output mode, derived from its 20ns maximum clock cycle time (tCYC2). This is confirmed in the AC Electrical Characteristics table (Table 11) under the 709279/69X12 speed grade for industrial temperature range. The device achieves this frequency with guaranteed 9ns clock-to-data (tCD2) and 6ns minimum clock high/low times.

Does the 709279L12PF8 support independent clock domains for left and right ports?

Yes, the 709279L12PF8 has fully independent clock inputs CLKL and CLKR, allowing asynchronous operation between ports. Each port's registers (address, data, control) are clocked only by their respective clock signal, enabling true dual-clock-domain interfacing - for example, connecting an FPGA running at 100MHz to an ARM processor at 66MHz without synchronization logic.

How does the address counter function in the 709279L12PF8, and what pins control it?

The 709279L12PF8 includes an internal address counter per port controlled by CNTENL/CNTENR (enable) and CNTRSTL/CNTRSTR (reset) pins. When CNTENX = VIL on the rising CLKX edge, the counter increments; when CNTRSTX = VIL, it resets to address 0. ADSX must be held high to use counter-generated addresses - verified in Truth Table III and Figure 15 of the datasheet.

What is the standby power consumption of the 709279L12PF8, and how is it achieved?

The 709279L12PF8 consumes 1mW typical standby power (ISB3), achieved by driving both CE0X and CE1X to CMOS high levels (>VCC – 0.2V), placing each port's internal circuitry into full standby. This is specified in Table 9 under the "L" (low-power) variant and confirmed for industrial temperature range - significantly lower than the 5mW of the "S" variant.

Can the 709279L12PF8 be used for depth expansion, and what signals enable this?

Yes, the 709279L12PF8 supports depth expansion using its dual chip enables CE0X and CE1X per port. As shown in Truth Table I and Figure 4, configuring CE0A = VIL/CE1A = VIH and CE0B = VIH/CE1B = VIL selects one device while deselecting the other - enabling seamless bank selection without external decoding logic. This is a core architectural feature explicitly documented for memory expansion.