Infineon Technologies CY7C1545KV18-450BZC

Overview

CY7C1545KV18 from Cypress Semiconductor is a 2M × 36-bit, 72-Mbit QDR® II+ SRAM with synchronous pipelined architecture, dual independent read/write ports, 450 MHz clock operation (900 Mbps DDR data rate), 2.0-cycle read latency when DOFF = HIGH, and HSTL I/O interface. It serves as high-bandwidth buffer memory in network packet processors requiring concurrent access to ingress/egress data paths.

For engineers reviewing the CY7C1545KV18 datasheet, CY7C1545KV18 pinout, CY7C1545KV18 application, or CY7C1545KV18 equivalent, key selection criteria include burst depth (4-word), x36 bus width, 1.8V core / 1.4–1.8V I/O supply compatibility, FBGA-165 package footprint, and QDR II+ timing compliance for deterministic low-latency memory access in telecom line cards.

Technical Context

This device implements a true dual-port architecture with physically separate read and write data paths-no bus turnaround required-enabling simultaneous read and write operations on the same clock cycle. Its 4-word burst transfers 144 bits per access (36-bit × 4), synchronized to both K and K clocks with echo clocks CQ/CQ for precise DDR capture.

The internal PLL enables accurate data placement at 450 MHz; when disabled via DOFF = LOW, it reverts to QDR I mode (1-cycle latency, ≤167 MHz). Address inputs are multiplexed and latched on alternating K edges, supporting 19-bit addressing for the 2M-depth array.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T36150 and IS61WV204836B, CY7C1545KV18 uniquely delivers 450 MHz QDR II+ performance with programmable latency and HSTL compatibility-making it optimal for next-gen packet processing where deterministic bandwidth and flexible timing modes are critical.

Availability

CY7C1545KV18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card design, baseband processor cache, and high-speed test equipment requiring stable component supply and long-term industrial availability.

Supply support for CY7C1545KV18 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) designs high-performance memory and programmable solutions for networking, automotive, and industrial systems, with emphasis on signal integrity and timing precision.

CY7C1545KV18 belongs to Cypress's QDR® II+ SRAM product line, engineered specifically for deterministic, low-latency, concurrent-read-write memory subsystems in high-speed communications infrastructure.

FAQ

What is the function of the DOFF pin on CY7C1545KV18?

The DOFF (PLL Turn Off) pin controls operational mode: when pulled HIGH, the internal PLL is active and the device operates in QDR II+ mode with 2.0-cycle read latency at up to 450 MHz; when pulled LOW, the PLL is disabled and the device reverts to QDR I timing with 1-cycle latency and maximum frequency reduced to 167 MHz. This pin must not be left floating and is typically pulled up via ≤10 kΩ resistor for normal operation.

How does the ZQ pin affect signal integrity in high-speed designs?

The ZQ pin connects to an external 240 Ω resistor to ground to calibrate the output driver impedance of CQ, CQ, and Q[35:0] pins to approximately 48 Ω (0.2 × RQ). This calibration compensates for process, voltage, and temperature variations, ensuring consistent HSTL signal rise/fall times and minimizing reflections on 50 Ω PCB traces-critical for reliable 900 Mbps DDR signaling.

Can CY7C1545KV18 support partial writes without read-modify-write cycles?

Yes. The device provides four independent Byte Write Select signals (BWS[3:0]), each controlling a 9-bit lane of the 36-bit data bus. When a BWS signal is deasserted (HIGH), the corresponding 9-bit segment remains unaltered during a write operation. This enables true partial-word updates-such as modifying only header fields in a packet buffer-without requiring a prior read cycle or external logic.

What is the significance of the CQ and CQ echo clocks?

CQ and CQ are free-running, phase-aligned echo copies of the K and K input clocks, respectively. They are sourced from the same internal PLL path as the data outputs and provide a local timing reference at the receiver. This eliminates skew between clock and data paths, simplifies PCB layout, and enables robust source-synchronous capture of Q[35:0] at 900 Mbps-especially valuable in FPGA- or ASIC-based systems where clock recovery margins are tight.