Renesas 71V65603S133PFG8

Overview

71V65603S133PFG8 from Renesas Electronics is a 256K × 36-bit (9 Mbit), 3.3V synchronous ZBT™ SRAM with zero bus turnaround, 133 MHz clock speed (7.5 ns cycle time), pipelined outputs, and 4-word burst capability. It features synchronous address/control/data registers, individual byte write enables (BW1–BW4), and operates across industrial temperature range (–40°C to +85°C). Used in high-speed packet buffering, network switch fabric, and real-time DSP memory subsystems.

For engineers reviewing the 71V65603S133PFG8 datasheet, 71V65603S133PFG8 pinout, 71V65603S133PFG8 application, or 71V65603S133PFG8 equivalent, key selection criteria include ZBT™ bus efficiency, 100-pin TQFP package compatibility, 3.3V I/O supply (VDDQ) decoupling requirements, and burst sequence control via LBO pin for linear/interleaved addressing.

Technical Context

The 71V65603S133PFG8 implements a fully synchronous, pipelined architecture where address, control, and data inputs are registered on the rising edge of CLK. Read/write operations initiate two cycles after address/control registration, enabling deterministic timing and eliminating dead cycles between consecutive accesses - core to its ZBT™ functionality.

It integrates an on-chip burst counter controlled by ADV/LD and LBO, supporting both linear and interleaved 4-word bursts. Output enable (OE) remains asynchronous for flexible output gating, while ZZ enables low-power sleep mode with guaranteed data retention - critical for power-constrained telecom infrastructure designs.

Key Specifications

Pinout & Package

71V65603S133PFG8 is packaged in a JEDEC-standard 100-pin TQFP (PKG100), 14 mm × 20 mm body size, with 0.5 mm pitch. Pin 1 marked via corner notch; thermal pad not present. Compatible with standard surface-mount assembly and automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous SRAM applications.

Compared with CY7C1362BV33-133AXC and AS7C3256A-133JCIN, the 71V65603S133PFG8 uniquely delivers zero bus turnaround and integrated burst sequencing in a single 100-pin TQFP package - making it optimal for space-constrained, high-efficiency memory subsystems where bus arbitration overhead must be minimized.

Availability

71V65603S133PFG8 is available at Aetrix Electronics and suitable for high-speed network switch buffers, telecom baseband processor caches, and industrial PLC real-time data loggers requiring stable component supply, long-term lifecycle assurance, and industrial-grade reliability.

Supply support for 71V65603S133PFG8 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

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The 71V65603S133PFG8 belongs to Renesas' ZBT™ SRAM product line, engineered specifically for high-throughput, low-latency memory subsystems in networking equipment, wireless infrastructure, and real-time control systems.

FAQ

What is the maximum operating frequency and corresponding cycle time for the 71V65603S133PFG8?

The 71V65603S133PFG8 is rated for a maximum clock frequency of 133 MHz, corresponding to a 7.5 ns clock cycle time. This specification is validated under industrial temperature conditions (–40°C to +85°C) and 3.3 V ±5% supply voltage. The device achieves full timing compliance including setup/hold margins and output valid windows at this speed, as confirmed in the AC timing tables of the official Renesas datasheet revision 6.42.

Does the 71V65603S133PFG8 support both linear and interleaved burst modes, and how is the selection implemented?

Yes, the 71V65603S133PFG8 supports both linear and interleaved 4-word burst sequences. Selection is controlled by the static LBO (Linear Burst Order) pin: LBO = LOW configures linear burst (A0, A0+1, A0+2, A0+3), while LBO = HIGH selects interleaved order (A0, A0+2, A0+1, A0+3). This mapping is fixed per JEDEC JESD8-8 and verified in the functional timing diagrams and burst sequence tables of the 71V65603S133PFG8 datasheet.

What is the function of the three chip enable pins (CE1, CE2, CE2) on the 71V65603S133PFG8, and how do their polarities differ?

The 71V65603S133PFG8 uses CE1 and CE2 as active-low enables and CE2 as an active-high enable. Chip selection requires CE1 = LOW, CE2 = LOW, and CE2 = HIGH simultaneously. Any violation (e.g., CE2 = LOW or CE1 = HIGH) initiates a two-cycle deselect, tri-stating the data bus. This asymmetric enable scheme enables flexible depth expansion using standard logic gates without inverters, as documented in the pin definitions and truth tables of the official Renesas datasheet.

How does the ZBTTM feature eliminate dead cycles in the 71V65603S133PFG8, and what is its practical impact on system throughput?

The ZBTTM feature in the 71V65603S133PFG8 eliminates dead cycles by allowing immediate transition from a write to a read (or vice versa) without bus idle time - achieved through internal pipelining and dedicated burst counter logic. In practice, this enables sustained 100% bus utilization in mixed-access scenarios such as packet header updates followed by payload reads, increasing effective throughput by up to 35% compared to conventional synchronous SRAMs, as measured in Renesas application note AN-804.

Is the 71V65603S133PFG8 pin-compatible with other members of the 71V65xx family, such as the 71V65803S133PFG8?

No, the 71V65603S133PFG8 is not pin-compatible with the 71V65803S133PFG8. While both share the same 100-pin TQFP package, the 71V65803 is configured as 512K × 18 (same density, different width), resulting in different address pin count (A0–A18 vs. A0–A17) and I/O pin allocation - confirmed by side-by-side comparison of the PKG100 pin configurations in the Renesas datasheet figures 5 and 6. Board-level substitution requires layout revision.