Renesas 70V9179L7PFG

Overview

70V9179L7PFG from Renesas Electronics is a high-speed 32K × 9-bit synchronous dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address from both ports, 12 ns cycle time in pipelined mode, LVTTL-compatible 3.3 V (±0.3 V) operation, and integrated address counters for burst applications. It serves as a low-latency shared memory buffer in real-time digital signal processors and FPGA-based communication subsystems.

For engineers reviewing the 70V9179L7PFG datasheet, 70V9179L7PFG pinout, 70V9179L7PFG application, or 70V9179L7PFG equivalent, key selection criteria include pipelined vs. flow-through output timing modes, dual chip enable support for depth expansion, counter-enable/counter-reset functionality, synchronous clock-to-data latency under 7.5 ns, and industrial-grade thermal performance up to +85°C.

Technical Context

The 70V9179L7PFG implements fully synchronous dual-port architecture with independent left/right clock inputs (CLKL/CLKR), registered address/data/control inputs, and self-timed write logic decoupled from clock edge timing. Each port features dedicated address strobe (ADSL/ADSR), counter enable (CNTENL/CNTENR), and counter reset (CNTRSTL/CNTRSTR) signals enabling deterministic address sequencing without external logic.

It supports two configurable output modes via FT/PIPEL and FT/PIPER pins: pipelined mode delivers 7.5 ns clock-to-data access with 12 ns minimum cycle time at 83 MHz, while flow-through mode provides lower latency read cycles with 22 ns minimum cycle time. Dual chip enables (CE0X/CE1X) allow seamless depth expansion without additional glue logic.

Key Specifications

Pinout & Package

70V9179L7PFG is housed in a 100-pin Thin Quad Flatpack (TQFP) package with 0.5 mm pitch, compliant with JEDEC MO-140, and marked "PNG100" in Renesas documentation. Pin 1 is located at top-left corner when notch faces upward; all VDD and VSS pins require local decoupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C3256B-12JIN and IS61WV3216BLL-10MLI, the 70V9179L7PFG uniquely integrates synchronous pipelined timing, dual-port address counters, and dual chip enables-enabling higher system-level throughput in FPGA/DSP co-processing without external control logic.

Availability

70V9179L7PFG is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, radar signal processing, and HD video overlay applications requiring stable component supply and long-term production continuity.

Supply support for 70V9179L7PFG 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 microcontrollers, analog, power, and memory solutions for automotive, industrial, and enterprise applications.

The 70V9179L7PFG belongs to Renesas' legacy IDT dual-port SRAM product line, designed specifically for high-bandwidth, low-latency shared memory in real-time embedded systems with strict timing determinism.

FAQ

What is the maximum operating frequency of the 70V9179L7PFG in pipelined output mode?

The 70V9179L7PFG supports up to 83 MHz operation in pipelined output mode, derived from its 12 ns minimum clock cycle time (tCYC2). This frequency is guaranteed across the commercial temperature range (0°C to +70°C) with 3.3 V ± 0.3 V supply. The 70V9179L7PFG achieves this using registered inputs and internal pipeline staging to minimize clock-to-data latency to 7.5 ns.

Does the 70V9179L7PFG support true simultaneous read/write operations on both ports?

Yes, the 70V9179L7PFG implements true dual-ported memory cells that allow simultaneous access-including concurrent read and write-to the same memory location from left and right ports. This capability eliminates arbitration overhead and is confirmed in the functional block diagram and truth tables. The 70V9179L7PFG maintains data integrity during such operations through internal cell design, not external protocol enforcement.

How does the address counter function in the 70V9179L7PFG, and what signals control it?

The 70V9179L7PFG includes independent address counters per port, controlled by CNTENL/CNTENR (enable) and CNTRSTL/CNTRSTR (reset) signals. When CNTEN = VIL on the rising CLK edge, the counter advances to the next address; ADS = VIH selects counter output over external address. The 70V9179L7PFG resets to A0 when CNTRST asserts, and supports interleaved burst transfers without CPU address bus involvement.

What is the purpose of the dual chip enables (CE0 and CE1) on each port of the 70V9179L7PFG?

The dual chip enables CE0X and CE1X per port provide flexible power management and depth expansion control. CE0 = VIL and CE1 = VIH enables normal operation; CE0 = VIH or CE1 = VIL places the port in low-power standby (1.5 mW typ). In depth expansion, CE0/CE1 combinations allow stacking multiple 70V9179L7PFG devices without external decode logic-directly supported in the functional description and truth table I.

Is the 70V9179L7PFG compatible with 5 V logic interfaces?

No, the 70V9179L7PFG is strictly a 3.3 V LVTTL-compatible device with VIH specified at 2.0 V minimum and VIL at 0.8 V maximum-designed for 3.3 V systems only. Its absolute maximum input voltage is +4.6 V, but sustained 5 V signaling violates DC operating conditions and risks reliability. For mixed-voltage systems, level translation is required before interfacing with 5 V controllers. The 70V9179L7PFG does not support 5 V tolerant I/O.