Renesas 70V3599S166DR

Overview

70V3599S166DR from IDT (now Renesas) is a high-speed 128K × 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 (6ns cycle time), delivers 12Gbps aggregate bandwidth, supports selectable pipelined or flow-through output modes, and features dual chip enables for seamless depth expansion in telecom switching fabric and network packet buffer applications.

For engineers reviewing the 70V3599S166DR datasheet, 70V3599S166DR pinout, 70V3599S166DR application, or 70V3599S166DR equivalent, this device is selected for deterministic low-latency memory sharing between tightly coupled processors, FPGA-to-ASIC data bridges, and real-time packet inspection engines requiring sub-4ns clock-to-data timing and independent 3.3V/2.5V I/O voltage control per port.

Technical Context

This device implements fully synchronous dual-port operation with registered address, data, and control inputs on both ports-enabling 1.7ns setup and 0.5ns hold times at 166MHz. Its internal architecture includes separate byte-enable logic per 9-bit data group, dual-cycle deselect (DCD) for pipelined mode, and JTAG-compliant IEEE 1149.1 test infrastructure.

The memory supports autonomous address counter operation via CNTEN/REPEAT/ADSR signals, allowing burst-mode sequential access without external address generation. Each port's I/O voltage (3.3V or 2.5V) is independently configurable via OPTL/OPTR pins, while core VDD remains fixed at 3.3V ±150mV-ensuring compatibility with mixed-voltage system designs.

Key Specifications

Pinout & Package

70V3599S166DR is packaged in a 208-pin Plastic Quad Flatpack (PQFP) with 0.5mm lead pitch and 28mm × 28mm body size. Pin functions are symmetrically distributed across left (L) and right (R) ports, with dedicated power/ground, clock, control, address, and bidirectional I/O banks.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-166AXC and IS61WV12836BLL-166TQLI, the 70V3599S166DR uniquely delivers per-port I/O voltage configurability, IEEE 1149.1 JTAG, and programmable output pipeline depth-making it the only choice for mixed-voltage, test-critical, or burst-optimized systems.

Availability

70V3599S166DR is available at Aetrix Electronics and suitable for telecom infrastructure, network security appliances, FPGA-based prototyping platforms, and industrial real-time controllers requiring stable component supply across extended product lifecycles.

Supply support for 70V3599S166DR 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

IDT (Integrated Device Technology), now part of Renesas Electronics, specializes in high-performance timing, memory, and interface solutions for communications and computing markets.

The 70V3599S166DR belongs to IDT's high-speed synchronous dual-port SRAM family, engineered specifically for deterministic, low-latency memory sharing in packet-switched networks and multi-processor coherency architectures.

FAQ

What is the maximum operating frequency of the 70V3599S166DR?

The 70V3599S166DR is rated for 166MHz operation in commercial temperature range (0°C to +70°C), achieving a 6ns clock cycle time. This specification is validated under full-load conditions with 3.3V core supply and proper signal integrity layout-exceeding 133MHz industrial-grade variants in throughput-critical applications.

Does the 70V3599S166DR support independent I/O voltage selection per port?

Yes, the 70V3599S166DR supports independent 3.3V or 2.5V I/O operation per port via OPTL and OPTR pins. When OPTL = VIH (3.3V), left-port I/Os operate at 3.3V levels and require VDDQL = 3.3V; when OPTL = VIL (0V), left-port I/Os operate at 2.5V levels and require VDDQL = 2.5V-enabling direct interfacing with mixed-voltage FPGAs or ASICs without level shifters.

How does the pipelined versus flow-through output mode affect timing in the 70V3599S166DR?

In pipelined mode (PL/FTL = VIH), the 70V3599S166DR inserts a 1-clock-cycle delay between address registration and data output, yielding faster 3.6ns tCD2 but requiring pipeline-aware controller logic. In flow-through mode (PL/FTL = VIL), output data appears combinatorially after address setup, resulting in longer 12ns tCD1 but eliminating pipeline stalls-ideal for simple state machines or asynchronous handshaking.

What is the function of the CNTEN and REPEAT signals in the 70V3599S166DR?

CNTEN enables automatic address incrementing on each clock edge, allowing burst-mode sequential access without external address counters. REPEAT resets the internal address counter to the last valid address loaded via ADS, enabling circular buffer or ping-pong memory access patterns. Both signals operate independently per port and remain active regardless of chip enable state-supporting background address generation during idle cycles.

Is JTAG boundary-scan supported on the 70V3599S166DR?

Yes, the 70V3599S166DR implements full IEEE 1149.1 JTAG boundary-scan functionality via dedicated TCK, TMS, TDI, TDO, and TRST pins. This enables automated PCB test coverage, interconnect verification, and in-system programming diagnostics-critical for high-reliability telecom and industrial deployments where field failure analysis is essential.