Renesas R1Q3A7218ABB-33IA0

Overview

R1Q3A7218ABB from Renesas Electronics is a 4,194,304-word × 18-bit (72 Mbit) synchronous Quad Data Rate II (QDR-II) SRAM with burst-of-four operation, 1.8 V core supply (VDD), 1.4–1.5 V I/O supply (VDDQ), and 165-pin FBGA (13 × 15 × 1.4 mm) packaging. It features dual input clocks (K and /K), echo clocks (CQ and /CQ), HSTL I/O, programmable output impedance, and JTAG 1149.1 test access - designed for high-bandwidth packet buffering in network switches and routers.

For engineers reviewing the R1Q3A7218ABB datasheet, R1Q3A7218ABB pinout, R1Q3A7218ABB application, or R1Q3A7218ABB equivalent, this device requires attention to DDR timing alignment, DLL/PLL enable/disable via /DOFF, ZQ impedance calibration, burst address sequencing, and industrial-temperature (−40°C to +85°C) operation under stable 1.8 V/1.5 V dual-rail conditions.

Technical Context

This QDR-II SRAM uses full-CMOS six-transistor memory cells and integrates synchronous peripheral logic with an internal burst counter. All inputs-including SA, /R, /W, and /BWx-are registered on the rising edges of K and /K, enabling precise double-data-rate timing control without external latches.

It supports concurrent read/write ports with 100% bus utilization, employs echo clocks CQ and /CQ for data capture synchronization, and includes clock-stop capability with microsecond-scale restart. The device implements four-tick burst addressing and internally self-timed write control to reduce address bus frequency and simplify depth expansion.

Key Specifications

Pinout & Package

Package: 165-pin Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm footprint, 1.4 mm height, RoHS-compliant Pb-free construction (BB marking).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar QDR-II SRAM applications.

Compared with CY7C17218BV25 and AS7C37218B-333BIN, the R1Q3A7218ABB delivers optimal balance of industrial-grade reliability, DLL/PLL-enabled high-speed timing margin, and ZQ-calibrated signal integrity - making it the preferred choice for carrier-class infrastructure where thermal robustness and 333 MHz sustained bandwidth are mandatory.

Availability

R1Q3A7218ABB is available at Aetrix Electronics and suitable for network packet buffering, high-speed switch fabric memory, telecom line card buffering, and real-time video processing frame store applications requiring stable component supply, long-term lifecycle support, and industrial-temperature qualification.

Supply support for R1Q3A7218ABB 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 Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The R1Q3A7218ABB belongs to Renesas' QDR-II SRAM product line, engineered specifically for high-throughput, low-latency data buffering in carrier-grade networking and telecom equipment where deterministic timing and thermal resilience are critical.

FAQ

What is the maximum operating frequency and corresponding cycle time for the R1Q3A7218ABB?

The R1Q3A7218ABB is rated for a maximum operating frequency of 333 MHz, corresponding to a minimum cycle time of 3.00 ns. This specification is confirmed in the DC Characteristics table on page 15 of the R10DS0165EJ0011 datasheet revision 0.11, under the "R1Q3A7218ABB" row and "333" column. Operation above this frequency violates AC timing parameters and may result in data corruption or metastability.

Does the R1Q3A7218ABB support industrial temperature range, and how is this indicated in the part number?

Yes, the R1Q3A7218ABB supports the industrial temperature range of −40°C to +85°C. This is explicitly encoded in the suffix "I" within the full orderable part number - for example, R1Q3A7218ABB-33IA0 indicates "I" for industrial grade, "A0" for assembly code, and "33" for the 333 MHz speed bin. The datasheet confirms R1Q*A series supports both commercial and industrial grades via the "I" suffix.

How is output impedance calibrated on the R1Q3A7218ABB, and what resistor value is recommended for ZQ?

Output impedance on the R1Q3A7218ABB is calibrated via the ZQ pin, which must be terminated to ground through a precision resistor (RQ). The datasheet specifies a typical RQ value of 250 Ω to achieve nominal 50 Ω output impedance (Q and CQ outputs set to 0.2 × RQ). Total external capacitance on the ZQ ball must remain below 7.5 pF to ensure accurate calibration during power-up initialization.

Can the R1Q3A7218ABB operate without using the DLL/PLL, and how is this configured?

Yes, the R1Q3A7218ABB can operate without the DLL/PLL by asserting /DOFF low during power-up initialization. When /DOFF is low, the DLL/PLL is bypassed, enabling stable operation down to DC (subject to minimum frequency constraints). This mode is intended for systems operating below 120 MHz or requiring deterministic, jitter-insensitive timing - though it sacrifices the wide data valid window provided by active DLL/PLL.

What is the function of the C and /C pins on the R1Q3A7218ABB, and are they required for operation?

The R1Q3A7218ABB does not include dedicated C and /C pins. As confirmed in the Pin Descriptions (page 6), the R1Q3 series uses K and /K as both input registration clocks *and* output reference clocks - eliminating the need for separate C/C pins. The datasheet notes that C and /C are present only in R1Q2/R1Q4/R1Q5 series; for R1Q3A7218ABB, K and /K serve dual timing roles, simplifying clock routing.