Cypress Semiconductor Corp CY7C1145KV18-450BZXC

Overview

CY7C1145KV18-450BZXC from Cypress Semiconductor is a 512K × 36-bit, 18-Mbit QDR® II+ synchronous SRAM with separate read/write ports, 450 MHz clock operation (900 Mbps DDR data rate), 2.0-cycle read latency, and HSTL I/O interface. It delivers full data coherency and concurrent read/write transactions for high-bandwidth packet buffering in network line cards.

For engineers reviewing the CY7C1145KV18-450BZXC datasheet, CY7C1145KV18-450BZXC pinout, CY7C1145KV18-450BZXC application, or CY7C1145KV18-450BZXC equivalent, key selection criteria include burst depth (four-word), DOFF-controlled latency mode (QDR I vs. QDR II+), echo clock timing (CQ/CQ), byte write select granularity (BWS[3:0]), and 165-ball FBGA package compatibility with high-speed PCB layout constraints.

Technical Context

The CY7C1145KV18 implements a true dual-port architecture with independent K/K clocks driving separate read and write pipelines-no bus turnaround required. Its four-word burst transfers 144 bits per read cycle (36-bit × 4) and supports depth expansion via RPS/WPS and BWS[3:0] controls.

Internal PLL enables precise 2.0-cycle read latency when DOFF = HIGH; disabling PLL (DOFF = LOW) reverts to QDR I mode (1-cycle latency, ≤167 MHz). Echo clocks CQ/CQ align with output data edges, and QVLD provides explicit valid-data indication synchronized to CQ/CQ.

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 option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T36120L10BG and ISSI IS61WV102436B, CY7C1145KV18-450BZXC delivers 4.5× higher bandwidth and deterministic 2-cycle latency with integrated timing aids (CQ/CQ/QVLD), making it optimal for next-generation packet-processing pipelines where timing margin is constrained.

Availability

CY7C1145KV18-450BZXC is available at Aetrix Electronics and suitable for network line cards, high-speed test equipment, telecom baseband units, and defense radar subsystems requiring stable component supply across extended production lifecycles.

Supply support for CY7C1145KV18-450BZXC 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 applications.

CY7C1145KV18 belongs to the QDR® II+ SRAM product line, engineered specifically for deterministic, high-throughput data buffering in packet-switched infrastructure where concurrent read/write and precise timing alignment are mandatory.

FAQ

What is the function of the DOFF pin?

The DOFF pin controls internal PLL operation: when tied HIGH, the device operates in QDR II+ mode with 2.0-cycle read latency and 450 MHz capability; when tied LOW, the PLL is disabled and the device reverts to QDR I timing (1-cycle latency, max 167 MHz). This dual-mode flexibility allows backward compatibility while enabling peak performance in new designs.

How does the ZQ pin affect signal integrity?

ZQ connects to an external resistor to ground to calibrate output driver impedance for CQ, CQ, and Q[35:0] pins. Calibration sets output impedance to 0.2 × RQ, matching typical PCB trace impedances (e.g., 50 Ω with 250 Ω resistor). This minimizes reflections and ensures clean signal edges at 450 MHz, critical for reliable DDR data capture.

Can CY7C1145KV18-450BZXC perform partial writes without read-modify-write?

Yes-four independent Byte Write Select inputs (BWS[3:0]) allow masking of 9-bit byte lanes during write operations. Each BWS bit controls nine consecutive data bits (e.g., BWS0 → D[8:0]), enabling selective updates of sub-36-bit fields without disturbing other bytes in the same location, reducing latency and bus traffic.

What is the role of QVLD in system timing?

QVLD is asserted synchronously with the first valid word of each four-word burst on Q[35:0], edge-aligned to CQ/CQ. It eliminates ambiguity in data-valid window detection, allowing receivers to latch data without complex delay-chain tuning or eye-diagram margining-especially valuable in FPGA-based systems with limited IO timing resources.