Renesas 70V3319S166PRFG

Overview

70V3319S166PRFG from Renesas Electronics (formerly IDT) is a high-speed 256K × 18-bit synchronous dual-port SRAM with true dual-port architecture enabling simultaneous read/write access to the same memory location from independent left and right ports. It operates at 166 MHz with 6 ns cycle time, 3.6 ns clock-to-data-out (pipelined), and supports selectable 3.3 V or 2.5 V I/O interfaces per port - used in network packet buffering, real-time DSP data exchange, and FPGA co-processor interconnects.

For engineers reviewing the 70V3319S166PRFG datasheet, 70V3319S166PRFG pinout, 70V3319S166PRFG application, or 70V3319S166PRFG equivalent, key selection criteria include pipelined output timing compliance, dual-chip-enable depth expansion capability, JTAG boundary-scan support (in BGA packages), industrial temperature operation up to +85°C, and LVTTL-compatible 3.3 V core with flexible I/O voltage configuration.

Technical Context

This device implements fully synchronous dual-port operation with registered address, data, and control inputs on both ports - delivering 1.7 ns setup and 0.5 ns hold times at 166 MHz. Its internal architecture includes separate byte enables (UBL/LBL and UBR/LBR), address strobe (ADSL/ADSR), counter enable (CNTENL/CNTENR), and repeat logic for burst address generation without external counters.

The 70V3319S166PRFG supports pipelined output mode only (FT/PIPE pins fixed high due to 128-pin TQFP pin count limitation), features Dual Cycle Deselect (DCD) for clean bus release, and integrates automatic power-down via dual chip enables (CE0/CE1) to reduce standby current to 15 mA in full CMOS standby mode.

Key Specifications

Pinout & Package

70V3319S166PRFG is packaged in a 128-pin Thin Quad Flatpack (TQFP) with 0.4 mm lead pitch and 14 mm × 20 mm body size. Pin functions are strictly defined per port (left/right), with dedicated clocks (CLKL/CLKR), chip enables (CE0L/CE1L, CE0R/CE1R), byte enables (UBL/LBL, UBR/LBR), and bidirectional I/O banks (I/O0L–I/O17L, I/O0R–I/O17R).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-166AXC and AS7C3256A-166JCIN, the 70V3319S166PRFG uniquely combines 256K depth, per-port 2.5/3.3 V I/O selection, integrated address counter with repeat, and TQFP packaging - making it optimal for space-constrained, mixed-voltage, burst-oriented embedded systems.

Availability

70V3319S166PRFG is available at Aetrix Electronics and suitable for network packet buffering, DSP-FPGA co-processing, and industrial motion control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for 70V3319S166PRFG 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 acquired Integrated Device Technology (IDT) in 2019 and now manufactures high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.

The 70V3319S166PRFG belongs to IDT's legacy high-speed synchronous dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor communication in real-time embedded systems with strict timing budgets.

FAQ

What is the maximum operating frequency of the 70V3319S166PRFG?

The 70V3319S166PRFG is rated for 166 MHz operation with a 6 ns clock cycle time in pipelined output mode. This frequency is guaranteed across the commercial temperature range (0°C to +70°C); the industrial grade variant supports 133 MHz up to +85°C. The device achieves this speed through fully registered inputs, self-timed write, and optimized memory cell design - no external PLL or clock multiplier is needed to reach 166 MHz performance.

Does the 70V3319S166PRFG support both 2.5 V and 3.3 V I/O interfaces simultaneously?

Yes, the 70V3319S166PRFG supports independent I/O voltage selection per port: OPTL configures the left port's VDDQL (2.5 V or 3.3 V), and OPTR configures the right port's VDDQR. This allows one port to interface with a 2.5 V FPGA bank while the other connects to a 3.3 V microcontroller - without level shifters. Core supply (VDD) remains fixed at 3.3 V, and each VDDQ must be supplied at the selected voltage level prior to applying signals.

Is JTAG boundary-scan supported on the 70V3319S166PRFG in its 128-pin TQFP package?

No, JTAG boundary-scan (IEEE 1149.1) is not supported on the 70V3319S166PRFG in the 128-pin TQFP package due to insufficient pin count - TDI, TDO, TCK, TMS, and TRST signals are omitted. JTAG is available only in the 208-pin and 256-pin BGA variants (e.g., 70V3319S166PFG). For TQFP-based designs requiring testability, external boundary-scan controllers or functional testing must be used instead.

What is the purpose of the ADS, CNTEN, and REPEAT signals on the 70V3319S166PRFG?

ADSL/ADSR latches the current address into an internal counter; CNTENL/CNTENR enables automatic increment on each clock cycle; REPEATL/REPEATR resets the counter to the last ADS-loaded address. Together, they eliminate the need for external address generators in burst-mode applications - for example, streaming video lines or FFT coefficient tables. The 70V3319S166PRFG uses these signals to perform sequential reads/writes with only one initial address setup.

Can the 70V3319S166PRFG be used in depth-expanded memory configurations?

Yes, the 70V3319S166PRFG supports depth expansion using dual chip enables (CE0 and CE1). When CE0 is asserted low and CE1 is held high, the port is active; asserting both CE0 and CE1 high places the port in power-down mode. This enables stacking multiple devices to increase memory depth (e.g., 512K × 18) without additional decode logic - the same address and control signals drive all devices, with chip select handled solely by CE0/CE1 pairing.