Infineon Technologies CY7C1545KV18-400BZXI

Overview

CY7C1545KV18-400BZXI from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 2M × 36 organization, 400 MHz maximum clock frequency, 2.0-cycle read latency, and separate read/write DDR ports delivering 900 MT/s effective data rate. It uses HSTL I/O, 1.8 V core (VDD), and 1.4–1.8 V I/O supply (VDDQ), and is packaged in a 165-ball FBGA (13 × 15 × 1.4 mm) for high-bandwidth networking buffer applications.

For engineers reviewing the CY7C1545KV18-400BZXI datasheet, CY7C1545KV18-400BZXI pinout, CY7C1545KV18-400BZXI application, or CY7C1545KV18-400BZXI equivalent, key selection criteria include its four-word burst architecture, echo clocks (CQ/CQ), QVLD data-valid signaling, DOFF-configurable latency mode, and JTAG 1149.1 test access support.

Technical Context

The CY7C1545KV18-400BZXI implements a synchronous pipelined QDR II+ architecture with independent read and write ports, each operating at DDR rates on rising edges of K and K clocks. Its 2M × 36 configuration maps to 19 address bits (A[18:0]), and it supports depth expansion via RPS/WPS and four byte-write selects (BWS[3:0]).

It integrates a PLL for precise data placement and uses echo clocks (CQ/CQ) aligned to K/K to simplify high-speed capture. The DOFF pin enables runtime switching between 2.0-cycle (PLL enabled) and 1.0-cycle (QDR I mode, PLL disabled) read latency - confirmed by functional description and timing tables in Rev. *O datasheet.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body, 0.8 mm ball pitch, RoHS-compliant Pb-free finish (BZXI suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1545KV18-400BZXI, the -450BZXI variant trades higher power and thermal load for marginal bandwidth gain, while the AS7C362000B-400BIN sacrifices configurability and calibration for lower unit cost - making the original optimal for latency-aware, high-reliability telecom infrastructure.

Availability

CY7C1545KV18-400BZXI is available at Aetrix Electronics and suitable for high-speed network switch buffers, telecom line card packet memory, baseband processing in 4G LTE eNodeB, and ATE pattern memory applications requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for CY7C1545KV18-400BZXI 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

Cypress Semiconductor (now part of Infineon Technologies) is a U.S.-based semiconductor company specializing in high-performance memory, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

The QDR® II+ SRAM product line was designed specifically for deterministic, high-bandwidth buffering in networking ASICs and telecom infrastructure - emphasizing concurrent access, low-latency predictability, and signal integrity at >400 MHz.

FAQ

What is the function of the DOFF pin on CY7C1545KV18-400BZXI?

The DOFF (PLL Turn Off) pin is an active-low control that configures the device's read latency mode. When pulled HIGH, the internal PLL is enabled and the device operates in QDR II+ mode with 2.0-cycle read latency. When pulled LOW, the PLL is disabled and the device reverts to QDR I timing with 1.0-cycle latency and a reduced maximum frequency of 167 MHz - verified in the Functional Description and Timing section of Rev. *O datasheet.

How does the ZQ pin affect output driver impedance?

The ZQ pin connects to an external 240 Ω resistor to ground, enabling on-die impedance calibration. This sets the output driver impedance of CQ, CQ, and Q[35:0] to 48 Ω (0.2 × 240 Ω), matching standard PCB trace impedances. If ZQ is tied directly to VDDQ, the device enters minimum-impedance mode (~30 Ω); it must never be left floating or connected to GND - per Pin Definitions on page 5 of the datasheet.

Can CY7C1545KV18-400BZXI perform concurrent read and write operations to the same address?

Yes - the QDR II+ architecture supports fully independent read and write ports sharing a common address bus. Concurrent access to the same address is permitted and results in coherent behavior: the write completes before the subsequent read returns updated data, ensured by internal pipelining and self-timed write circuitry - explicitly confirmed in the Functional Description and Truth Table sections of the datasheet.

What is the purpose of the QVLD signal, and how is it timed?

QVLD is a synchronous output that pulses HIGH for one K/K clock cycle to indicate when Q[35:0] data is valid and stable. It is edge-aligned with the CQ and CQ echo clocks - not with K/K - ensuring precise correlation to captured data in source-synchronous receiver designs. This eliminates timing uncertainty in high-speed interfaces, as defined in the Pin Definitions and Switching Characteristics sections.