Renesas 70V3319S166PRF

Overview

70V3319S166PRF from Integrated Device Technology 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 166MHz (6ns cycle time), delivers 6Gbps aggregate bandwidth, supports selectable 3.3V or 2.5V I/O interfaces per port, and features pipelined output mode only (no flow-through) in its 128-pin TQFP package. It is used in real-time packet buffering for telecom line cards.

For engineers reviewing the 70V3319S166PRF datasheet, 70V3319S166PRF pinout, 70V3319S166PRF application, or 70V3319S166PRF equivalent, key selection criteria include guaranteed 3.6ns clock-to-data-out timing at 166MHz, dual chip enables for seamless depth expansion, separate byte controls for 18-bit bus matching, industrial-grade temperature support up to +85°C, and JTAG-compatibility exclusion due to 128-pin TQFP pin count limitation.

Technical Context

This device implements fully synchronous operation on both ports with input registers for address, data, and control signals-enabling minimal 1.7ns setup and 0.5ns hold times at 166MHz. Its memory array uses true dual-port cells, not pseudo-dual-port or shared-bus arbitration, allowing concurrent access without internal contention.

The 70V3319S166PRF integrates independent address counters per port with CNTEN/REPEAT/ADSR controls, supports Dual Cycle Deselect (DCD) in pipelined mode, and provides automatic power-down via CE0/CE1 assertion. Core logic runs at 3.3V (±150mV), while each port's I/O voltage (VDDQ) is independently configurable to 3.3V or 2.5V via OPTL/OPTR pins-verified for mixed-voltage interoperation.

Key Specifications

Pinout & Package

70V3319S166PRF is housed in a 128-pin Thin Quad Flatpack (TQFP) with 0.5mm pitch, body size 14mm × 20mm × 1.4mm. Pin functions are symmetrically distributed across left (L) and right (R) ports, with dedicated clocks (CLKL/CLKR), chip enables (CE0L/CE1L, CE0R/CE1R), byte enables (UBL/LBL, UBR/LBR), and 18-bit 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 IDT70V3319S133PFI, the 70V3319S166PRF uniquely delivers 166MHz performance in a commercial-grade 128-pin TQFP with per-port selectable I/O voltage-making it optimal for high-throughput telecom and FPGA-adjacent applications where voltage flexibility and speed are jointly critical.

Availability

70V3319S166PRF is available at Aetrix Electronics and suitable for telecom infrastructure, FPGA-based acceleration, and digital signal processing applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 70V3319S166PRF 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, is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance silicon solutions for communications and computing markets.

The 70V3319S166PRF belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for real-time, low-latency data buffering in telecom line cards, network processors, and FPGA co-processing subsystems.

FAQ

What is the maximum guaranteed clock frequency for the 70V3319S166PRF?

The 70V3319S166PRF is characterized and guaranteed to operate at 166MHz across the commercial temperature range (0°C to +70°C), delivering a 6ns clock cycle time and 3.6ns maximum clock-to-data-out (tCD2) in pipelined mode. This specification is validated per AC Electrical Characteristics Table 11 in the official datasheet.

Does the 70V3319S166PRF support flow-through output mode?

No, the 70V3319S166PRF does not support flow-through output mode. As explicitly stated in the datasheet (page 4, Note 8), the 128-pin TQFP package lacks sufficient pins to implement the PIPE/FT selection function. The device operates exclusively in pipelined output mode, with tCD2 = 3.6ns (max) at 166MHz.

Can the left and right ports of the 70V3319S166PRF operate at different I/O voltages?

Yes, the 70V3319S166PRF supports independent I/O voltage selection per port: OPTL configures the left port's VDDQL (3.3V or 2.5V), and OPTR configures the right port's VDDQR (3.3V or 2.5V). This allows one port to interface with a 3.3V FPGA while the other connects to a 2.5V ASIC, as confirmed in Pin Names table (page 5) and DC Operating Conditions (pages 7–8).

Is JTAG boundary-scan supported on the 70V3319S166PRF in its 128-pin TQFP package?

No, JTAG is not supported on the 70V3319S166PRF in the 128-pin TQFP package. Due to pin count limitations, the TDI, TDO, TCK, TMS, and TRST pins are omitted - a restriction explicitly noted on page 4 (Note 9) and page 1 of the datasheet. JTAG is only available on the 208-pin and 256-pin BGA variants.

What is the purpose of the CNTEN and REPEAT signals on the 70V3319S166PRF?

The CNTEN signal enables the internal address counter on each port, advancing the address on every rising clock edge when asserted low. REPEAT resets the counter to the last valid address loaded via ADS, enabling efficient burst reads/writes without host CPU intervention - a feature documented in Truth Table II (page 6) and functional description (page 2).