Renesas 70T3599S133BFI

Overview

70T3599S133BFI 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 133MHz (4.2ns access time), supports independent 2.5V core and selectable 2.5V/3.3V I/O interfaces per port, and features pipelined or flow-through output modes for burst data transfer in telecom switching fabric.

For engineers reviewing the 70T3599S133BFI datasheet, 70T3599S133BFI pinout, 70T3599S133BFI application, or 70T3599S133BFI equivalent, this device is selected for deterministic latency, JTAG-compliant boundary scan, industrial temperature operation (–40°C to +85°C), and depth-expansion capability via dual chip enables-critical for packet buffer and protocol processor designs.

Technical Context

The 70T3599S133BFI implements fully synchronous dual-port operation with separate clock domains (CLKL/CLKR), address strobe (ADSL/ADSR), and counter-based address generation (CNTENL/CNTENR, REPEATL/REPEATR). Its memory array uses true dual-port cells, eliminating arbitration overhead and enabling concurrent access without collision-induced stalls.

It integrates dedicated interrupt (INTL/INTR) and collision detection (COLL/COLR) logic, dual-cycle deselect (DCD) for pipelined mode, and independent sleep control (ZZL/ZZR) that disables dynamic inputs while preserving JTAG accessibility. The OPTL/OPTR pins configure per-port I/O voltage (2.5V or 3.3V), decoupling core and interface supply domains.

Key Specifications

Pinout & Package

70T3599S133BFI is housed in a 256-pin Ball Grid Array (BGA) package measuring 17mm × 17mm × 1.4mm with 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).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-133AXC and AS7C3256P-133JCIN, the 70T3599S133BFI provides unique value through per-port I/O voltage configurability, integrated JTAG, and hardware collision/interrupt logic-enabling higher integration and lower system-level validation effort in telecom and industrial control.

Availability

70T3599S133BFI is available at Aetrix Electronics and suitable for telecom switching fabric, industrial PLC data exchange, network packet buffer, and radar signal processing applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70T3599S133BFI 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, RF, and sensor solutions for communications, computing, and industrial markets.

The 70T3599S133BFI belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for deterministic-latency, high-bandwidth data buffering in telecom infrastructure, military/aerospace systems, and real-time industrial controllers.

FAQ

What is the maximum operating frequency of the 70T3599S133BFI?

The 70T3599S133BFI is rated for 133MHz operation in both commercial and industrial temperature ranges. This corresponds to a 7.5ns clock cycle time in pipelined output mode and guarantees a maximum 4.2ns access time. It is not rated for 166MHz or 200MHz operation in the BGA package variant-those speeds are only supported in other package options like BC256 under commercial conditions.

Does the 70T3599S133BFI support independent voltage selection for each port's I/O interface?

Yes, the 70T3599S133BFI supports independent I/O voltage selection per port using the 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 I/O with VDDQL = 2.5V. The same applies independently to the right port via OPTR and VDDQR.

How does the collision detection feature work in the 70T3599S133BFI?

The 70T3599S133BFI asserts COLL (left port) or COLR (right port) when both ports attempt to write to the same memory address simultaneously. These open-drain outputs activate within 4.2ns (max) of the violating clock edge and remain asserted until the conflict resolves. They interface directly with external logic or microcontrollers to trigger error-handling routines without software polling.

Is JTAG boundary scan supported on the 70T3599S133BFI?

Yes, the 70T3599S133BFI fully supports IEEE 1149.1 JTAG boundary scan via dedicated TCK, TMS, TDI, TDO, and TRST pins. This capability is retained even when the device enters sleep mode (ZZL/ZZR asserted), allowing in-system test and debug without disrupting system power states.

What is the function of the REPEATL and REPEATR pins on the 70T3599S133BFI?

The REPEATL and REPEATR pins control the address counter's repeat behavior on the left and right ports. When asserted (VIH), the counter resets to the last valid address loaded via ADSL or ADSR-enabling rapid burst access to a fixed memory region without repeated address bus transactions. This is commonly used for descriptor table reads or command queue servicing.