Renesas 70V3319S133BF

Overview

70V3319S133BF 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 133MHz (7.5ns cycle time), supports selectable 3.3V or 2.5V I/O interfaces per port, and delivers 4.2ns clock-to-data-out in pipelined mode for real-time data buffering in telecom line cards and packet-switching engines.

For engineers reviewing the 70V3319S133BF datasheet, 70V3319S133BF pinout, 70V3319S133BF application, or 70V3319S133BF equivalent, key selection criteria include its 128-pin TQFP package with pipelined-only output mode, industrial temperature support (–40°C to +85°C), dual chip enable for depth expansion, and JTAG-unavailable configuration - all critical for deterministic latency in FPGA co-processor memory subsystems.

Technical Context

This device implements fully synchronous dual-port operation with independent clock domains (CLKL/CLKR), register-controlled address/data/control inputs, and self-timed write logic to achieve 6ns minimum cycle time at 166MHz. Each port features separate byte enables (UBL/LBL, UBR/LBR), address strobe (ADSL/ADSR), counter enable (CNTENL/CNTENR), and repeat functionality for burst-mode addressing.

The 70V3319S133BF uses LVTTL-compatible signaling with core VDD = 3.3V ±150mV and independently configurable I/O supply (VDDQL/VDDQR) at either 3.3V or 2.5V via OPTL/OPTR pins. Due to 128-pin TQFP pin count limitation, pipelined output mode is fixed - flow-through mode and JTAG are not supported.

Key Specifications

Pinout & Package

70V3319S133BF is housed in a 128-pin Thin Quad Flatpack (TQFP) with 0.5mm pitch, body size 14mm × 20mm × 1.4mm. Pin functions are asymmetrically distributed across left (L) and right (R) ports, with dedicated clock, address, data I/O, control, and power terminals per side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-133AXC and AS7C3256B-133JCIN, the 70V3319S133BF uniquely delivers per-port I/O voltage selection and dual chip enables in the same 128-pin footprint - enabling mixed-voltage integration and scalable memory depth without layout changes.

Availability

70V3319S133BF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and avionics data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70V3319S133BF 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 computing solutions.

The 70V3319S133BF belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for deterministic-latency, multi-processor memory sharing in telecom, test equipment, and real-time control systems.

FAQ

What is the maximum operating frequency of the 70V3319S133BF?

The 70V3319S133BF is rated for 133MHz operation (7.5ns clock cycle time) across the industrial temperature range (–40°C to +85°C). Its pipelined output mode achieves 4.2ns clock-to-data-out (tCD2) at this frequency, making it suitable for systems requiring guaranteed sub-5ns read latency. The device does not support 166MHz operation in the 128-pin TQFP package due to timing margin constraints.

Does the 70V3319S133BF support flow-through output mode?

No, the 70V3319S133BF in the 128-pin TQFP package does not support flow-through output mode. As explicitly stated in the datasheet notes, "PIPE/FT option in PKG128 is not supported due to limitation in pin count. Device is pipelined outputs only on each port." All timing parameters and functional behavior assume fixed pipelined operation with 1-cycle latency.

How is I/O voltage configured on the 70V3319S133BF?

I/O voltage on the 70V3319S133BF is configured per port using the OPTL and OPTR pins. Setting OPTL = VIH (3.3V) selects 3.3V I/O levels for the left port and requires VDDQL = 3.3V; setting OPTL = VIL (0V) selects 2.5V I/O levels and requires VDDQL = 2.5V. The right port operates identically via OPTR and VDDQR. Both ports may be set to the same or different voltages simultaneously.

What is the purpose of the CNTEN and REPEAT signals on the 70V3319S133BF?

CNTENL/CNTENR enable automatic address incrementing on each clock cycle, while REPEATL/REPEATR reset the internal address counter to the last valid address loaded via ADSL/ADSR. This combination supports efficient burst-mode memory access - for example, in packet buffering where sequential addresses are written rapidly, then repeated reads occur from a known starting point without reloading the base address.

Is JTAG debugging supported on the 70V3319S133BF?

No, JTAG is not supported on the 70V3319S133BF in the 128-pin TQFP package. The datasheet explicitly states: "Due to the limited pin count, JTAG is not supported in the PKG128 package." JTAG signals (TCK, TMS, TDI, TDO, TRST) are omitted from this variant's pinout, and the boundary-scan logic is disabled. For JTAG-capable variants, consider the 208-pin fpBGA or 256-pin BGA packages.