Renesas 709079L12PF

Overview

709079L12PF from Integrated Device Technology is a 32K × 8-bit synchronous dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address from left and right ports, 12 ns maximum clock-to-data access (pipelined mode), 20 ns clock cycle time in pipelined output mode, and industrial temperature support (–40°C to +85°C), used in real-time DSP co-processing and high-speed inter-processor communication systems.

For engineers reviewing the 709079L12PF datasheet, 709079L12PF pinout, 709079L12PF application, or 709079L12PF equivalent, key selection considerations include pipelined vs. flow-through output timing, dual-chip-enable depth expansion capability, counter-enabled burst addressing, and low-power standby current of 1 mA (typ.) in L-grade configuration.

Technical Context

This device implements fully synchronous operation on both ports with registered address, data, and control inputs-requiring only 4 ns setup and 1 ns hold time relative to CLK. Its self-timed internal write pulse operates independently of clock edge transitions, enabling minimal cycle time without external timing constraints.

The dual-port architecture supports independent left/right port control via dedicated CE0/CE1, R/W, OE, ADS, CNTEN, and CNTRST signals. The FT/PIPE pin selects between flow-through (zero-latency) and pipelined (one-cycle latency) output modes per port, while the address counter enables automatic sequential addressing during burst transfers.

Key Specifications

Pinout & Package

709079L12PF is housed in a 100-pin Thin Quad Flatpack (TQFP) package, body size 14 mm × 14 mm × 1.4 mm, with exposed thermal pad (PN100 footprint). All VCC and GND pins must be individually decoupled 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, 709079L12PF offers native 5 V operation and integrated burst addressing, reducing external logic; versus IDT70V9089L12PF, it provides optimal cost/performance for 256 Kbit applications without unused address lines.

Availability

709079L12PF is available at Aetrix Electronics and suitable for real-time DSP co-processing, multi-core interconnect, and industrial motion control applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 709079L12PF 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT7090xx family was engineered specifically for deterministic, low-latency dual-processor and DSP-host memory sharing-emphasizing synchronous timing integrity, power efficiency, and industrial reliability in 5 V systems.

FAQ

What is the maximum operating frequency of the 709079L12PF in pipelined output mode?

The 709079L12PF supports a maximum clock frequency of 50 MHz in pipelined output mode, derived from its 20 ns maximum clock cycle time (tCYC2). This timing is guaranteed across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply, making it suitable for high-throughput embedded systems where deterministic latency is critical. The 709079L12PF achieves this without requiring external wait states or clock dividers.

Does the 709079L12PF support simultaneous read and write operations to the same memory location?

Yes, the 709079L12PF uses true dual-ported memory cells that allow simultaneous access-including concurrent read from one port and write to the same address on the other port. This capability is fundamental to its architecture and is explicitly confirmed in the Functional Block Diagram and Description sections of the datasheet. The 709079L12PF does not require arbitration logic or software coordination for such operations.

What is the function of the ADS pin on the 709079L12PF, and how does it differ from standard address latching?

The ADS (Address Strobe) pin on the 709079L12PF asynchronously loads the current address bus value into the internal address register on the next rising clock edge-enabling precise control over when external addresses are captured. Unlike conventional latched address buses, ADS allows dynamic switching between external address input and internal counter-generated addresses without pipeline stalls. This behavior is documented in Truth Table II and timing waveforms for the 709079L12PF.

How does the 709079L12PF achieve its 1 mA typical standby current, and what conditions must be met?

The 709079L12PF achieves 1 mA typical standby current (ISB3) when both ports are fully disabled using CMOS-level chip enables-specifically, when CE0 and CE1 are driven to voltages > VCC – 0.2 V or < 0.2 V, with all inputs held static. This ultra-low power state disables internal logic clocks and I/O drivers while retaining memory contents. The 709079L12PF datasheet confirms this value applies only under those exact bias conditions and at f = 0.

Is the 709079L12PF pin-compatible with other members of the IDT7090xx family, such as the IDT709089 series?

No, the 709079L12PF is not fully pin-compatible with the IDT709089 series: A15 is a No Connect (NC) for the 709079L12PF (32K × 8), whereas it is a functional address line for the 64K × 8 IDT709089 variants. Pin configurations, signal names, and package footprints match across the family, but A15's NC status in the 709079L12PF means direct substitution requires verification of address decoding logic. The 709079L12PF datasheet explicitly notes this distinction in Pin Configuration and Functional Description sections.