Renesas 70V3319S166BC8

Overview

70V3319S166BC8 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 option in TQFP package). It is used in real-time packet buffering for telecom line cards.

For engineers reviewing the 70V3319S166BC8 datasheet, 70V3319S166BC8 pinout, 70V3319S166BC8 application, or 70V3319S166BC8 equivalent, key selection criteria include guaranteed 166MHz operation in commercial grade, 128-pin TQFP packaging with no JTAG or PL/FT option, dual chip enables for depth expansion, and independent VDDQ voltage selection per port via OPT pins.

Technical Context

This device implements fully synchronous dual-port operation with clocked address, data, and control registers on both ports-enabling 1.7ns setup and 0.5ns hold times at 166MHz. It uses self-timed write logic to minimize cycle time and includes dedicated address strobe (ADSL/ADSR), counter enable (CNTENL/CNTENR), and repeat (REPEATL/REPEATR) functions for burst address generation.

The 70V3319S166BC8 integrates separate upper/lower byte enables (UBL/LBL and UBR/LBR) for multiplexed bus compatibility, dual-cycle deselect (DCD) support in pipelined mode, and automatic power-down controlled independently per port via CE0/CE1. Its core runs at 3.3V ±150mV while I/O voltage per port is configurable to either 3.3V or 2.5V via OPTL/OPTR pins and corresponding VDDQL/VDDQR supplies.

Key Specifications

Pinout & Package

70V3319S166BC8 is housed in a 128-pin Thin Quad Flatpack (TQFP) package with 0.5mm pitch, 14mm × 20mm footprint, and exposed thermal pad (not electrically connected). All VDD pins require 3.3V supply; VDDQL/VDDQR must match OPTL/OPTR logic levels (3.3V if VIH, 2.5V if VIL).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV18 and IDT70V3519S133BG, the 70V3319S166BC8 uniquely delivers 166MHz commercial-grade performance in a compact 128-pin TQFP with integrated address counter logic-making it optimal for space-constrained, high-throughput embedded designs where flow-through mode is unnecessary.

Availability

70V3319S166BC8 is available at Aetrix Electronics and suitable for telecom infrastructure, FPGA acceleration, and industrial motion control applications requiring stable component supply and long-term production continuity.

Supply support for 70V3319S166BC8 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 high-performance timing, memory interface, and RF solutions for communications and computing markets.

The 70V33xx family was designed specifically for ultra-low-latency, high-bandwidth dual-port memory applications in networking equipment, test instrumentation, and real-time control systems demanding deterministic access timing.

FAQ

What is the maximum operating frequency of the 70V3319S166BC8?

The 70V3319S166BC8 is rated for 166MHz operation (6ns clock cycle time) in the commercial temperature range (0°C to +70°C). This is confirmed by AC Electrical Characteristics Table 11 in the datasheet, which specifies tCYC2 = 6ns min for pipelined mode. Industrial-grade variants like 70V3319S133BC8 operate up to 133MHz across −40°C to +85°C.

Does the 70V3319S166BC8 support flow-through output mode?

No, the 70V3319S166BC8 does not support flow-through output mode. As explicitly stated in the datasheet (page 4, Note 8), "PIPE/FT option in PKG128 is not supported due to limitation in pin count. Device is pipelined outputs only on each port." The 128-pin TQFP package lacks sufficient pins to implement the FT/PIPE control signal routing required for mode selection.

Can the left and right ports of the 70V3319S166BC8 operate at different I/O voltages?

Yes, the 70V3319S166BC8 supports independent I/O voltage selection per port. OPTL sets VDDQL (left port I/O supply) to 3.3V (VIH) or 2.5V (VIL), and OPTR sets VDDQR (right port I/O supply) identically but independently. This allows mixed-voltage interfacing-for example, left port at 3.3V to an FPGA and right port at 2.5V to an ASIC-without external level shifters.

What is the function of the REPEAT and CNTEN pins on the 70V3319S166BC8?

REPEATL/REPEATR and CNTENL/CNTENR enable hardware-addressed burst operations. When CNTENX = VIL, the internal address counter increments on each CLKX rising edge. When REPEATX is asserted, the counter resets to the last valid address loaded via ADSX. This eliminates software overhead for sequential memory access in applications like video frame buffering or packet payload streaming.

Is JTAG debugging supported on the 70V3319S166BC8?

No, JTAG is not supported on the 70V3319S166BC8. As noted in the datasheet (page 4, Note 9): "Due to the limited pin count, JTAG is not supported in the PKG128 package." The 128-pin TQFP lacks dedicated TCK, TMS, TDI, TDO, and TRST pins required for IEEE 1149.1 compliance. JTAG is available only on larger packages like the 208-pin fpBGA (e.g., 70V3319S166BF) and 256-pin BGA variants.