Renesas 70T3319S133BF

Overview

70T3319S133BF from Integrated Device Technology is a high-speed 256K × 18-bit synchronous dual-port static RAM with true dual-port architecture enabling simultaneous read/write access to the same memory location. It operates at 133MHz (7.5ns cycle time), supports selectable 2.5V or 3.3V I/O interfaces per port, and features pipelined/flow-through output modes, JTAG IEEE 1149.1 compliance, and industrial temperature range (–40°C to +85°C). It is used in real-time packet buffering for telecom line cards.

For engineers reviewing the 70T3319S133BF datasheet, 70T3319S133BF pinout, 70T3319S133BF application, or 70T3319S133BF equivalent, key selection criteria include dual-port latency tolerance, voltage-flexible I/O configuration, collision detection flag timing (≤4.2ns), interrupt flag response (≤7ns), and BGA package compatibility with 0.8mm ball pitch fpBGA footprint.

Technical Context

The 70T3319S133BF implements fully synchronous operation on both left and right ports with independent clock inputs (CLKL/CLKR), dual chip enables (CE0/CE1 per port), and separate byte controls (UBL/LBL, UBR/LBR) for multiplexed bus matching. Its address strobe (ADSL/ADSR) and counter enable (CNTENL/CNTENR) logic supports burst-mode address generation without external counters.

It integrates self-timed write circuitry enabling minimal 5ns cycle time in pipelined mode, while supporting flow-through mode with 15ns minimum cycle time. The device includes dedicated sleep mode pins (ZZL/ZZR) that disable dynamic inputs except JTAG, and provides collision detection (COLL/COLR) and interrupt flags (INTL/INTR) for inter-port coordination in shared-memory systems.

Key Specifications

Pinout & Package

70T3319S133BF is packaged in a 208-pin fine-pitch Ball Grid Array (fpBGA) with 0.8mm ball pitch and 15mm × 15mm body size. All VDD pins require 2.5V connection; VDDQ pins must be set to 2.5V or 3.3V depending on OPT pin state per port.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-133BZXI and AS7C3256A-133JCIN, the 70T3319S133BF uniquely combines 2.5V core efficiency, per-port voltage selectability, hardware collision detection, and pipelined sub-5ns access - making it optimal for power-constrained, mixed-voltage, real-time shared-memory systems.

Availability

70T3319S133BF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and avionics applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 70T3319S133BF 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, specializes in high-performance timing, memory interface, and RF solutions for communications and computing markets.

The 70T33xx family was designed specifically for deterministic, low-latency shared-memory architectures in telecom line cards, DSP co-processing, and safety-critical control systems requiring simultaneous dual-port access and hardware arbitration signals.

FAQ

What is the maximum operating frequency of the 70T3319S133BF?

The 70T3319S133BF is rated for 133MHz operation with a guaranteed 7.5ns pipelined clock cycle time. This speed grade is supported in both commercial and industrial temperature ranges and applies to the BF208 fpBGA package variant. Higher speeds (166MHz/200MHz) are not available in this package.

Does the 70T3319S133BF support mixed-voltage operation between its two ports?

Yes, the 70T3319S133BF supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL to VDD configures the left port for 3.3V I/O levels (requiring VDDQL = 3.3V), while setting OPTR to VSS configures the right port for 2.5V I/O levels (requiring VDDQR = 2.5V). This enables direct interfacing with heterogeneous logic families without external level shifters.

How does the collision detection feature work on the 70T3319S133BF?

The 70T3319S133BF asserts COLL (left port) or COLR (right port) within 4.2ns when both ports attempt to access the same memory address simultaneously. These open-drain flags are asynchronous and remain asserted until the conflicting access completes. They are used for hardware arbitration in real-time systems where software polling would introduce unacceptable latency.

What is the purpose of the ADS and REPEAT pins on the 70T3319S133BF?

ADSL/ADSR latches the current address on the rising edge of CLK, enabling burst-mode sequential access without external counters. REPEATL/REPEATR resets the internal address counter to the last ADS-loaded address - allowing circular buffer implementation with zero FPGA logic. Both functions operate independently per port and do not affect CE0/CE1 or R/W timing.

Can the 70T3319S133BF enter low-power sleep mode while maintaining JTAG accessibility?

Yes, asserting ZZL or ZZR places the corresponding port into sleep mode, reducing dynamic current to ≤5mA while preserving JTAG functionality (TCK, TMS, TDI, TDO, TRST remain active). Static inputs (PL/FT, OPT, and the ZZ pins themselves) retain their states during sleep, enabling boundary-scan testing without full device wake-up.