Renesas 70T3589S166BC8

Overview

70T3589S166BC8 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. Used in real-time packet buffering for telecom line cards and FPGA co-processor interconnects.

For engineers reviewing the 70T3589S166BC8 datasheet, 70T3589S166BC8 pinout, 70T3589S166BC8 application, or 70T3589S166BC8 equivalent, key selection criteria include industrial-grade timing (–40°C to +85°C), dual chip enables for depth expansion, JTAG IEEE 1149.1 compliance, and support for asynchronous interrupt/collision detection flags in high-concurrency memory systems.

Technical Context

This device implements fully synchronous operation on both left and right ports with register-controlled address, data, and control inputs-enabling minimal setup/hold times (1.5ns setup, 0.5ns hold @ 200MHz). Its dual-port memory array uses true dual-port cells, not time-multiplexed or pseudo-dual configurations.

The architecture includes independent counter/address registers per port with ADS strobe, CNTEN enable, and REPEAT latch functionality. Each port supports configurable I/O voltage (2.5V or 3.3V) via dedicated OPT pins and VDDQ supplies, while core logic runs strictly at 2.5V ±100mV.

Key Specifications

Pinout & Package

70T3589S166BC8 is packaged in a 256-pin Ball Grid Array (BC256) with 17mm × 17mm footprint and 1.0mm ball pitch. All VDD pins require connection to 2.5V; VDDQ pins must match OPT pin configuration (3.3V if OPT = VDD, 2.5V if OPT = VSS). A17L and A17R are no-connect pins per datasheet note.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-166AXC and IDT70V27L15PF8, the 70T3589S166BC8 uniquely delivers industrial-grade 166MHz performance with per-port I/O voltage selection, JTAG visibility, and hardware address counters-making it optimal for new designs demanding deterministic latency and mixed-voltage integration.

Availability

70T3589S166BC8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and avionics data recording applications requiring stable component supply across extended product lifecycles.

Supply support for 70T3589S166BC8 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 70T35xx family was designed specifically for ultra-low-latency, high-bandwidth dual-port memory applications in telecom switching, test equipment, and real-time embedded systems requiring deterministic access and robust signal integrity.

FAQ

What is the maximum operating frequency of the 70T3589S166BC8 under industrial temperature conditions?

The 70T3589S166BC8 is rated for 166MHz operation across the full industrial temperature range of –40°C to +85°C. This is confirmed in the datasheet's DC and AC Electrical Characteristics tables (Table 9 and Table 11), where 166MHz timing parameters-including 3.6ns max access time and 6ns min clock cycle in pipelined mode-are explicitly specified for industrial grade. The 200MHz speed grade (S200) is commercial-only and not offered in this variant.

Does the 70T3589S166BC8 support independent voltage supplies for each port's I/O interface?

Yes, the 70T3589S166BC8 supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL = VDD (2.5V) configures the left port for 3.3V I/O levels with VDDQL = 3.3V; setting OPTL = VSS (0V) configures it for 2.5V I/O levels with VDDQL = 2.5V. The same applies independently to the right port. This allows mixed-voltage system integration-for example, interfacing a 2.5V FPGA to a 3.3V DSP using a single 70T3589S166BC8.

How does the address counter and REPEAT function operate in the 70T3589S166BC8?

The 70T3589S166BC8 implements a per-port address counter that increments on each rising CLK edge when CNTENx = L. ADSx strobes load an external address into the counter; REPEATx, when asserted, resets the counter to the last ADSx-loaded address-not to power-up state. This enables efficient burst transfers without software intervention. The counter operates independently of CE, BE, or R/W states, and is validated in Truth Table II (page 7 of the datasheet).

What is the purpose of the ZZL and ZZR pins on the 70T3589S166BC8, and how do they affect power consumption?

ZZL and ZZR are port-specific sleep mode inputs. When asserted (VIH), each pin disables dynamic inputs on its respective port-reducing standby current to ≤20mA (ISB3, Table 9). JTAG inputs remain active during sleep, enabling debug access without waking the port. This feature is essential for power-sensitive applications like avionics recorders, where the 70T3589S166BC8 can enter low-power state between data bursts while retaining boundary-scan capability.

Is JTAG boundary-scan supported on the 70T3589S166BC8, and what package constraints apply?

Yes, JTAG boundary-scan compliant with IEEE 1149.1 is supported on the 70T3589S166BC8-but only in the 256-pin BGA (BC256) package. The datasheet explicitly states "JTAG is not supported in the DR208 package" (page 4, note 9) and confirms JTAG pin assignments (TCK, TMS, TDI, TDO, TRST) are present and functional in the BC256 pinout (page 3). This makes the 70T3589S166BC8 suitable for high-reliability systems requiring production testability and field debug.