Renesas 70T3519S166BC8

Overview

70T3519S166BC8 from Integrated Device Technology is a high-speed 256K × 36-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 (3.6ns access 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 70T3519S166BC8 datasheet, 70T3519S166BC8 pinout, 70T3519S166BC8 application, or 70T3519S166BC8 equivalent, key selection criteria include dual-port timing coordination, per-port voltage configuration via OPT pins, sleep mode (ZZ) control, collision/interrupt flag behavior, and BGA package layout constraints for high-density routing.

Technical Context

This device implements fully synchronous operation on both ports with register-controlled inputs-address, data, byte enables, and control signals all sampled on the rising edge of CLKL/CLKR. Its dual-port memory array uses true dual-port cells, not pseudo-dual-port or multiplexed architectures, enabling concurrent access without arbitration logic.

It supports two distinct output timing modes: pipelined (tCD2 = 3.6ns max at 166MHz) for burst throughput, and flow-through (tCD1 = 12ns max) for low-latency deterministic access. Collision detection and interrupt flags are generated synchronously with port clocks and cleared by address strobe (ADSL/ADSR) or reset events.

Key Specifications

Pinout & Package

70T3519S166BC8 is housed in a 256-pin Ball Grid Array (BC256) package with 1.0mm ball pitch and 17mm × 17mm footprint. Power and ground balls are distributed across the array to minimize noise and support simultaneous switching.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-166AXC and AS7C3256B-166JCIN, the 70T3519S166BC8 uniquely delivers per-port voltage configurability, hardware collision detection, and IEEE 1149.1 JTAG-making it the only option for mixed-voltage, safety-critical, or high-test-coverage designs requiring deterministic dual-port arbitration.

Availability

70T3519S166BC8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and avionics data concentrators requiring stable component supply across extended product lifecycles.

Supply support for 70T3519S166BC8 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 70T35xx family was designed specifically for deterministic, low-latency dual-port memory applications in telecom line cards, industrial controllers, and military/aerospace systems demanding simultaneous access, mixed-voltage I/O, and robust testability.

FAQ

What is the maximum operating frequency of the 70T3519S166BC8 in industrial temperature range?

The 70T3519S166BC8 is rated for 166MHz operation across the full industrial temperature range (–40°C to +85°C), with guaranteed 3.6ns maximum access time in pipelined mode. This specification is validated for the BC256 BGA package; the BF208 fpBGA variant does not support 166MHz in industrial grade.

How does the OPT pin configure I/O voltage levels on the 70T3519S166BC8?

On the 70T3519S166BC8, OPTL sets the left port's I/O voltage: VIH = 2.5V selects 3.3V operation (requiring VDDQL = 3.3V), while VIL = 0V selects 2.5V operation (requiring VDDQL = 2.5V). OPTR performs the same function independently for the right port, enabling asymmetric voltage configurations.

Does the 70T3519S166BC8 support JTAG boundary scan, and which package options include it?

Yes, the 70T3519S166BC8 supports full IEEE 1149.1 JTAG boundary scan via dedicated TCK/TMS/TDI/TDO/TRST pins. JTAG is available only in the 256-pin BGA (BC256) and 208-pin fpBGA (BF208) packages-not in the PQFP (DR208) variant due to pin count limitations.

What is the function of the ZZ pin on the 70T3519S166BC8, and how does it affect power consumption?

The ZZL and ZZR pins on the 70T3519S166BC8 are asynchronous sleep mode controls. When asserted high, they disable dynamic inputs (except JTAG) and reduce standby current to ≤20mA per port. Recovery requires three clock cycles, and static inputs (PL/FT, OPT) remain functional during sleep.

How does collision detection work on the 70T3519S166BC8, and what triggers the COLR/COLL flags?

The 70T3519S166BC8 generates COLR (right port) or COLL (left port) flags when a write operation on one port targets the same address currently being written to-or read from-by the opposite port. The flags are synchronous to the respective port's clock and reset by subsequent ADS assertion or system reset.