Renesas 70V3319S133BF8

Overview

70V3319S133BF8 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. Designed for real-time inter-processor communication in telecom line cards and packet buffering systems.

For engineers reviewing the 70V3319S133BF8 datasheet, 70V3319S133BF8 pinout, 70V3319S133BF8 application, or 70V3319S133BF8 equivalent, this device requires attention to port-specific VDDQ/OPT configuration, pipelined-only operation in its 128-pin TQFP package, and dual chip enable depth expansion capability without external logic.

Technical Context

The 70V3319S133BF8 implements fully synchronous dual-port operation with registered address, data, and control inputs on both ports-enabling 1.7ns setup and 0.5ns hold times at 133MHz. Its memory array uses true dual-port cells, not pseudo-dual-port or multiplexed architectures, allowing concurrent access without arbitration logic.

It features independent counter-enable and repeat functions per port for burst address generation, dual-cycle deselect (DCD) for pipelined outputs, and separate upper/lower byte enables (UB/LB) supporting 9-bit and 9-bit I/O partitioning. JTAG boundary scan (IEEE 1149.1) is omitted due to pin count constraints in the BF8 (128-pin TQFP) package.

Key Specifications

Pinout & Package

70V3319S133BF8 is housed in a 128-pin Thin Quad Flatpack (TQFP) package measuring 14 mm × 20 mm × 1.4 mm, with 0.5 mm lead pitch. The package supports surface-mount reflow assembly and provides full signal access for dual-port operation, though JTAG and PL/FT mode are disabled due to pin limitations.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-133AXC and IDT70V3519S133BG, the 70V3319S133BF8 uniquely combines industrial temperature range, 128-pin TQFP compactness, and per-port 2.5V/3.3V I/O selection - making it optimal for cost-sensitive, mixed-voltage embedded designs where JTAG and flow-through mode are unnecessary.

Availability

70V3319S133BF8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and medical imaging systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 70V3319S133BF8 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, and RF power solutions for communications and computing markets.

The 70V33xx family was designed specifically for high-bandwidth, low-latency shared-memory applications in networking equipment, baseband processors, and real-time control systems - emphasizing deterministic timing, dual-port concurrency, and flexible I/O voltage operation.

FAQ

What is the maximum operating frequency of the 70V3319S133BF8?

The 70V3319S133BF8 is rated for 133MHz operation, corresponding to a 7.5ns clock cycle time in pipelined mode. This frequency is guaranteed across the full industrial temperature range (–40°C to +85°C) and applies to both left and right ports independently. The device does not support 166MHz operation - that speed grade is reserved for the 70V3319S166 variants.

Does the 70V3319S133BF8 support flow-through output mode?

No, the 70V3319S133BF8 does not support flow-through output mode. Due to pin count limitations in its 128-pin TQFP (BF8) package, the FT/PIPEL and FT/PIPER pins are unimplemented, and the device operates exclusively in pipelined output mode on both ports. This ensures deterministic 1-cycle latency but removes flow-through timing flexibility.

How is I/O voltage selected on each port of the 70V3319S133BF8?

I/O voltage is selected independently per port using the OPTL and OPTR pins. Driving OPTL to VIH (≥2.0V) configures the left port for 3.3V I/O operation and requires VDDQL = 3.3V; driving it to VIL (≤0.8V) configures 2.5V I/O and requires VDDQL = 2.5V. The same logic applies to OPTR and VDDQR. Both ports may operate at different voltages simultaneously.

What is the purpose of the CNTEN and REPEAT signals on the 70V3319S133BF8?

CNTEN enables the internal address counter on each port; when asserted (VIL), the counter advances on each clock edge regardless of other control signals. REPEAT resets the counter to the last valid address loaded via ADS (Address Strobe). Together, they enable autonomous burst addressing - reducing host processor load during sequential memory accesses such as DMA transfers or frame buffering.

Can the 70V3319S133BF8 be used in depth-expanded memory configurations?

Yes, the 70V3319S133BF8 supports depth expansion using its dual chip enable (CE0X/CE1X) architecture. Two or more devices can share address and data buses while using complementary CE pairs to select individual units - eliminating the need for external decode logic. The dual-cycle deselect (DCD) feature prevents bus contention during rapid switching between devices in pipelined mode.