Cypress Semiconductor Corp CY7C1145KV18-400BZXI

Overview

CY7C1145KV18 from Cypress Semiconductor is a 18-Mbit QDR® II+ SRAM with 512K × 36 organization, 2.0-cycle read latency, 400 MHz clock frequency (900 Mbps DDR data rate), and 165-ball FBGA (13 × 15 × 1.4 mm) package. It features separate read/write ports, echo clocks (CQ/CQ), QVLD data-valid indicator, and programmable impedance via ZQ pin - deployed in high-speed network packet buffers and telecom line cards requiring deterministic low-latency memory access.

For engineers reviewing the CY7C1145KV18 datasheet, CY7C1145KV18 pinout, CY7C1145KV18 application, or CY7C1145KV18 equivalent, key selection criteria include its 400 MHz operation with 2.0-cycle read latency, HSTL I/O compatibility (VDDQ = 1.4–1.8 V), JTAG 1149.1 test support, and depth expansion via RPS/WPS port selects - all critical for synchronous burst memory subsystems in FPGA- or ASIC-based infrastructure equipment.

Technical Context

The CY7C1145KV18 implements a true dual-port QDR II+ architecture with independent read and write pipelines, enabling concurrent transactions without bus turnaround. Its four-word burst transfers 144 bits per read/write cycle (36-bit × 4), synchronized to both K and K rising edges, delivering sustained 900 Mbps per port at 400 MHz.

Internal PLL ensures precise data placement relative to echo clocks CQ/CQ, while DOFF pin enables mode switching between QDR II+ (2-cycle latency, up to 400 MHz) and QDR I (1-cycle latency, ≤167 MHz). Byte write select signals BWS[3:0] provide granular 9-bit byte control across the 36-bit data bus.

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.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed burst SRAM applications.

Compared with IDT72T36120 and IS61WV102436B, CY7C1145KV18 delivers 20% higher bandwidth, eliminates external clock forwarding components via integrated PLL and echo clocks, and provides deterministic data validity with QVLD - reducing FPGA logic utilization and timing closure effort in high-end infrastructure designs.

Availability

CY7C1145KV18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, FPGA-based protocol acceleration, and high-speed test equipment requiring stable component supply and long-term industrial availability.

Supply support for CY7C1145KV18 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 fabless 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 memory subsystems in networking and telecom infrastructure - emphasizing concurrent access, low-latency predictability, and signal integrity at multi-Gbps rates.

FAQ

What is the function of the DOFF pin on CY7C1145KV18?

The DOFF (PLL Turn Off) pin controls internal PLL operation: when pulled HIGH, the device operates in QDR II+ mode with 2.0-cycle read latency and up to 400 MHz clock rate; when pulled LOW, the PLL is disabled and the device reverts to QDR I timing with 1-cycle latency and a maximum frequency of 167 MHz. This pin must be externally biased - typically via a 10 kΩ pull-up resistor for normal operation.

How does the ZQ pin affect output driver impedance?

The ZQ pin connects to an external resistor (RQ) tied to ground, enabling on-die impedance calibration: output drivers for Q[35:0], CQ, and CQ are tuned to 0.2 × RQ. For example, a 60 Ω RQ yields 12 Ω driver impedance. Alternatively, tying ZQ directly to VDDQ activates minimum-impedance mode. ZQ must never be left floating or connected to GND, as this disables calibration and risks signal integrity failure.

Can CY7C1145KV18 perform partial writes without reading existing data?

Yes - the device supports true partial writes using BWS[3:0] (Byte Write Select) signals. Each BWS bit enables or disables one 9-bit byte within the 36-bit D[35:0] bus. When a BWS line is deasserted (HIGH), the corresponding byte remains unaltered in memory, eliminating the need for read-modify-write sequences. This capability is essential for efficient metadata or header updates in packet processing applications.

What is the role of QVLD in system timing design?

QVLD is an edge-aligned output strobe that asserts coincident with valid data on Q[35:0]. Unlike fixed-delay sampling schemes, QVLD eliminates reliance on worst-case setup/hold margins by providing a dynamic, cycle-accurate indication of data validity. This allows FPGA or ASIC receivers to sample data using QVLD as a capture enable, significantly easing timing closure at 400 MHz and improving robustness against PVT variation.