Renesas 709379L7PFG

Overview

709379L7PFG from Renesas Electronics (formerly IDT) is a high-speed, synchronous, pipelined dual-port static RAM with true dual-ported 32K × 18-bit memory architecture, supporting simultaneous independent read/write access on left and right ports. It operates at 100 MHz in pipelined mode (10 ns cycle time), features flow-through or pipelined output selection via FT/PIPE pins, and delivers 7.5 ns clock-to-data access in pipelined mode. It is used in real-time digital signal processing systems requiring low-latency inter-processor communication.

For engineers reviewing the 709379L7PFG datasheet, 709379L7PFG pinout, 709379L7PFG application, or 709379L7PFG equivalent, key selection criteria include its industrial temperature range (–40°C to +85°C), TTL-compatible 5 V ±10% supply, dual chip enables for depth expansion, and support for address counter enable/reset - all critical for deterministic timing in FPGA co-processor or telecom line card designs.

Technical Context

The 709379L7PFG implements fully synchronous operation on both ports with 4 ns setup / 0 ns hold timing on all control, address, and data inputs. Its internal architecture includes separate address/data/control registers per port, self-timed write logic, and independent upper-byte (I/O9–I/O17) and lower-byte (I/O0–I/O8) controls for bus-matching compatibility.

It supports two distinct output modes: flow-through (FT/PIPE = VIL, tCD1 ≤ 18 ns) and pipelined (FT/PIPE = VIH, tCD2 ≤ 7.5 ns), with corresponding clock cycle times of 22 ns and 12 ns respectively. The device also integrates an address counter with CNTEN/CNTRST control, enabling burst-mode sequential addressing without external logic.

Key Specifications

Pinout & Package

709379L7PFG is housed in a 100-pin Thin Quad Flatpack (TQFP) package with exposed thermal pad (PN100), body size 14 mm × 14 mm × 1.4 mm. 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 SRAM applications.

Compared with CY7C028V-15AXC and IDT70V9369S10PFGI, the 709379L7PFG uniquely supports 32K × 18-bit density at 5 V with 7.5 ns pipelined access - making it irreplaceable in legacy 5 V telecom and industrial systems requiring maximum bandwidth per pin count.

Availability

709379L7PFG is available at Aetrix Electronics and suitable for telecom infrastructure, FPGA co-processing, industrial motion control, and radar DSP applications requiring stable component supply and long-term lifecycle support.

Supply support for 709379L7PFG 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

Renesas Electronics Corporation is a global semiconductor leader delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT applications.

The 709379L7PFG belongs to Renesas' legacy IDT synchronous dual-port SRAM product line, engineered for deterministic, low-latency memory sharing in real-time multi-processor systems where concurrent access and precise timing control are mandatory.

FAQ

What is the maximum operating frequency of the 709379L7PFG in pipelined mode?

The 709379L7PFG achieves a 100 MHz maximum operating frequency in pipelined output mode, enabled by its 10 ns clock cycle time (tCYC2 = 12 ns min). This specification is guaranteed across the industrial temperature range (–40°C to +85°C) with 5.0 V ±10% supply. The 709379L7PFG's pipelined architecture ensures consistent 1-cycle latency for read operations, making it suitable for high-throughput DSP and packet processing applications.

Does the 709379L7PFG support independent output modes on left and right ports?

Yes, the 709379L7PFG supports independent output mode selection per port via dedicated FT/PIPEL (left) and FT/PIPER (right) pins. Each port can be configured for flow-through (VIL) or pipelined (VIH) operation, allowing asymmetric timing configurations - for example, pipelined reads on the CPU port for speed and flow-through writes on the peripheral port for simplicity. This flexibility is confirmed in the Functional Block Diagram and Truth Table I of the official datasheet.

What is the function of the CNTEN and CNTRST pins on the 709379L7PFG?

The CNTEN (Counter Enable) and CNTRST (Counter Reset) pins on the 709379L7PFG control an integrated address counter that generates sequential addresses without external logic. When CNTEN = VIL on the rising CLK edge, the counter advances; CNTRST = VIL resets it to address 0. Both signals operate synchronously per port (CNTENL/CNTRSTL and CNTENR/CNTRSTR), enabling burst-mode DMA transfers. This functionality is explicitly documented in Truth Table II and Timing Waveform 12 of the 709379L7PFG datasheet.

Is the 709379L7PFG RoHS-compliant and lead-free?

Yes, the 709379L7PFG is a green part compliant with RoHS directives. The datasheet explicitly states "Green parts available" in the Features section and confirms Pb-free (lead-free) packaging in the Ordering Information table, where the 'G' suffix denotes green material content. This applies to the PF (TQFP) package variant, including the 709379L7PFG ordering code, and meets JEDEC J-STD-609 Category 1 requirements.

Can the 709379L7PFG be used in depth-expanded memory configurations without external logic?

Yes, the 709379L7PFG supports logic-free depth expansion using its dual chip enables (CE0/CE1 per port). As detailed in Truth Table I and Figure 4 of the datasheet, asserting CE0 = VIL and CE1 = VIH selects a port, while CE0 = VIH or CE1 = VIL deselects and powers down that port. This allows stacking multiple 709379L7PFG devices to increase memory depth (e.g., 64K × 18-bit) using only address MSBs - no external decoders or glue logic required.