Renesas 70T3599S133BFGI8

Overview

70T3599S133BFGI8 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 on independent left and right ports. It operates at 133MHz (7.5ns cycle time), supports selectable 2.5V or 3.3V I/O interfaces per port, and features pipelined or flow-through output modes. Designed for real-time inter-processor communication in telecom line cards and packet buffer applications.

For engineers reviewing the 70T3599S133BFGI8 datasheet, 70T3599S133BFGI8 pinout, 70T3599S133BFGI8 application, or 70T3599S133BFGI8 equivalent, this device delivers deterministic low-latency memory sharing between heterogeneous processors, supports JTAG IEEE 1149.1 boundary scan, and provides industrial-grade reliability (-40°C to +85°C) in a 208-pin fpBGA package.

Technical Context

The 70T3599S133BFGI8 implements fully synchronous operation on both ports with independent clock inputs (CLKL/CLKR), dual chip enables (CE0/CE1 per port), and byte-enable controls (BE0–BE3) for 9-bit granularity writes. Its address counter logic supports auto-increment via CNTEN and repeat addressing via REPEAT signals, enabling burst transfers without external address generation.

It integrates interrupt and collision detection flags (INTR/COLR, INTL/COLL) to signal concurrent access conflicts, and includes sleep mode (ZZL/ZZR) that reduces dynamic power while preserving JTAG accessibility. The core runs at 2.5V ±100mV, while I/O voltage is independently configurable per port via OPTL/OPTR pins and corresponding VDDQL/VDDQR supplies.

Key Specifications

Pinout & Package

70T3599S133BFGI8 is housed in a 208-pin fine-pitch Ball Grid Array (BFG208) package measuring 15mm × 15mm × 1.4mm with 0.8mm ball pitch. All VDD pins require 2.5V supply; VDDQL/VDDQR must match selected I/O voltage (2.5V or 3.3V) per port based on OPTL/OPTR configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 70T3599S133BFGI8, the BC256 variant offers identical functionality in a larger package for thermal headroom, while the Cypress part trades configurability and dual-width flexibility for lower density and fixed I/O voltage - making it unsuitable for mixed-voltage or high-burst-rate designs.

Availability

70T3599S133BFGI8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and radar signal processing applications requiring stable component supply across extended product lifecycles.

Supply support for 70T3599S133BFGI8 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 deterministic, low-latency inter-processor communication in systems requiring simultaneous dual-port access - targeting telecom, defense, and industrial automation.

FAQ

What is the maximum operating frequency of the 70T3599S133BFGI8?

The 70T3599S133BFGI8 is rated for 133MHz operation (7.5ns cycle time) in both commercial and industrial temperature ranges. This frequency is guaranteed under pipelined output mode with tCYC2 ≤ 7.5ns. It does not support 166MHz or 200MHz variants - those require different suffixes (S166/S200) and are unavailable in the BFG208 package.

Does the 70T3599S133BFGI8 support independent I/O voltage selection per port?

Yes, the 70T3599S133BFGI8 supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL to VDD (2.5V) configures the left port for 3.3V I/O levels with VDDQL = 3.3V; setting it to VSS (0V) configures 2.5V operation with VDDQL = 2.5V. The right port operates identically but independently using OPTR and VDDQR.

How does the address counter function work on the 70T3599S133BFGI8?

The 70T3599S133BFGI8 implements an internal address counter controlled by CNTENL/CNTENR and ADSL/ADSR. When CNTENX = VIL and ADSX = VIH on the rising clock edge, the counter increments. REPEATX resets the counter to the last valid ADS-loaded address. This enables automatic burst addressing without CPU involvement - essential for streaming applications like video frame buffers.

What is the purpose of the ZZL and ZZR pins on the 70T3599S133BFGI8?

ZZL and ZZR are independent sleep mode enable inputs for the left and right ports. When asserted (VIH), they disable dynamic inputs and reduce current draw to ≤15mA while preserving JTAG functionality. Static inputs (PL/FTx, OPTx, and ZZx themselves) remain active. Sleep mode requires 2 cycles to activate and 3 cycles to recover, ensuring glitch-free entry/exit.

Is JTAG boundary scan supported on the 70T3599S133BFGI8?

Yes, the 70T3599S133BFGI8 fully supports IEEE 1149.1 JTAG boundary scan via dedicated TCK, TMS, TDI, TDO, and TRST pins. This capability is retained even in sleep mode, enabling in-system test and debug without waking the memory core - a key advantage over non-JTAG-enabled dual-port SRAMs.