Renesas 70T3599S166BC

Overview

70T3599S166BC 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. It operates at 166MHz (3.6ns access), supports independent 2.5V core and selectable 2.5V/3.3V I/O supplies per port, and features pipelined or flow-through output modes. It is used in real-time packet buffering for telecom line cards requiring deterministic latency and collision detection.

For engineers reviewing the 70T3599S166BC datasheet, 70T3599S166BC pinout, 70T3599S166BC application, or 70T3599S166BC equivalent, this page delivers verified timing parameters, BGA package mapping, industrial temperature support (–40°C to +85°C), JTAG-compliant boundary scan, and dual-chip-enable depth expansion capability - all confirmed for the BC256 256-pin BGA variant.

Technical Context

The 70T3599S166BC implements fully synchronous operation on both left and right ports with independent clock inputs (CLKL/CLKR), address strobes (ADSL/ADSR), and counter enable/repeat logic for burst addressing. Its dual-port memory array uses true dual-port cells with register-controlled inputs to achieve minimal setup/hold times (1.5ns setup, 0.5ns hold @ 200MHz).

It supports configurable I/O voltage per port via OPTL/OPTR pins - setting each port to either 2.5V or 3.3V signaling independently - while maintaining a fixed 2.5V ±100mV core supply (VDD). Sleep mode (ZZL/ZZR) reduces dynamic power by disabling non-JTAG inputs without affecting static control signals.

Key Specifications

Pinout & Package

70T3599S166BC 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 for low-impedance supply delivery; VDD (2.5V core) and VDDQ (I/O supply) pins are segregated per port.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-166BZXI and AS7C3256B-166JCN, the 70T3599S166BC uniquely delivers industrial temperature support, hardware collision detection, per-port I/O voltage selection, and pipelined/flow-through mode flexibility - making it the only option for deterministic, mixed-voltage, real-time dual-port memory applications.

Availability

70T3599S166BC is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and aerospace data concentrators requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70T3599S166BC 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 solutions for communications and computing markets.

The 70T35xx family was designed specifically for high-throughput, low-latency dual-port memory applications in networking, test equipment, and real-time control systems - emphasizing deterministic timing, flexible voltage operation, and hardware-assisted arbitration.

FAQ

What is the maximum operating frequency of the 70T3599S166BC at industrial temperature?

The 70T3599S166BC is rated for 166MHz operation over the full industrial temperature range (–40°C to +85°C). This corresponds to a guaranteed 6ns clock cycle time and 3.6ns maximum clock-to-data delay in pipelined mode. The 200MHz speed grade (S200) is commercial-only and not available in the BC256 package.

Does the 70T3599S166BC support JTAG boundary scan, and which package options include it?

Yes, the 70T3599S166BC supports IEEE 1149.1 JTAG boundary scan with dedicated TCK, TMS, TDI, TDO, and TRST pins. JTAG is implemented in the BC256 (256-pin BGA) and BFG208 (208-pin fpBGA) packages. It is explicitly excluded from the DR208 (208-pin PQFP) package due to pin count limitations.

How does the 70T3599S166BC handle simultaneous access to the same memory location from both ports?

The 70T3599S166BC uses true dual-port memory cells that permit simultaneous read/write access to identical addresses. When contention occurs, the device asserts collision flags (COLL/COLR) and interrupt outputs (INTL/INTR) asynchronously. These signals enable external logic or firmware to resolve conflicts without data corruption or bus lockup.

Can the left and right ports of the 70T3599S166BC operate at different I/O voltages?

Yes. The 70T3599S166BC allows independent I/O voltage selection per port using OPTL and OPTR pins. Setting OPTL = VDD (2.5V) configures the left port for 3.3V signaling (requiring VDDQL = 3.3V), while OPTR = VSS (0V) sets the right port to 2.5V signaling (requiring VDDQR = 2.5V). This enables mixed-voltage system integration.

What is the purpose of the REPEAT and CNTEN signals in the 70T3599S166BC address counter?

The CNTEN signal enables automatic address increment on each clock rising edge, supporting burst-mode sequential access. REPEAT, when asserted, resets the internal counter to the last valid address loaded via ADS - allowing rapid re-access to a known location without reloading the address bus. Both functions reduce CPU overhead in DMA and streaming applications.