Infineon Technologies CY7C1145KV18-400BZXCT

Overview

CY7C1145KV18-400BZXCT from Cypress Semiconductor is a 18-Mbit QDR® II+ SRAM with 512K × 36 organization, 400 MHz 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 (VDDQ = 1.4–1.8 V), integrated PLL for precise timing, and echo clocks (CQ/CQ) to simplify high-speed data capture in networking packet buffers.

For engineers reviewing the CY7C1145KV18-400BZXCT datasheet, CY7C1145KV18-400BZXCT pinout, CY7C1145KV18-400BZXCT application, or CY7C1145KV18-400BZXCT equivalent, key selection criteria include burst depth (four 36-bit words), byte-write select granularity (BWS[3:0]), QVLD timing alignment, DOFF-controlled latency mode switching, and 165-ball FBGA (13 × 15 × 1.4 mm) thermal/mechanical constraints.

Technical Context

This device implements a synchronous pipelined QDR II+ architecture with physically isolated read and write data paths-eliminating bus turnaround overhead. It latches address inputs on alternating rising edges of K and K clocks, enabling concurrent read and write operations without arbitration delay.

The internal PLL synchronizes CQ/CQ echo clocks to K/K for deterministic data capture, while the DOFF pin toggles between 2.0-cycle (PLL enabled) and 1.0-cycle (QDR I mode, ≤167 MHz) read latency. Byte write enables (BWS[3:0]) support partial-word updates across all 36 data bits with per-byte masking.

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 dual-port SRAM applications.

Compared with AS7C36256P-15JIN and MT47H64M16HR-37E, CY7C1145KV18-400BZXCT delivers guaranteed 2-cycle latency, concurrent read/write at 400 MHz, and hardware-synchronized data capture - essential for deterministic real-time systems where jitter or arbitration stalls are unacceptable.

Availability

CY7C1145KV18-400BZXCT is available at Aetrix Electronics and suitable for high-speed network packet buffers, telecom line card data caches, baseband processing memory, and test equipment pattern generators requiring stable component supply and long-term industrial availability.

Supply support for CY7C1145KV18-400BZXCT 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, with emphasis on signal integrity and timing precision.

This device belongs to the QDR® II+ SRAM product line, engineered specifically for deterministic, low-latency, high-throughput buffering in packet-switched infrastructure - prioritizing concurrent access, echo-clock synchronization, and system-level timing closure over raw density or cost-per-bit.

FAQ

What is the function of the DOFF pin on CY7C1145KV18-400BZXCT?

The DOFF (PLL Disable) pin controls the internal phase-locked loop: when pulled HIGH, the PLL is active and enables 2.0-cycle read latency at up to 400 MHz; when pulled LOW, the PLL is bypassed and the device operates in QDR I mode with 1.0-cycle latency but limited to ≤167 MHz. This pin must be externally biased - floating is not allowed.

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

The ZQ pin calibrates the output driver impedance of Q[35:0], CQ, and CQ pins to match the PCB's characteristic impedance (typically 50 Ω). A 50 Ω resistor between ZQ and ground sets output impedance to 10 Ω (0.2 × 50 Ω); connecting ZQ to VDDQ enables minimum impedance mode. Incorrect ZQ termination causes signal reflections and eye closure at 900 MT/s.

Can CY7C1145KV18-400BZXCT perform partial writes without corrupting adjacent data?

Yes - the four independent byte write select signals (BWS[3:0]) allow masking of any 9-bit subset of the 36-bit data bus during write operations. For example, asserting only BWS[0] writes D[8:0] while preserving D[35:9] unchanged. This is implemented in hardware and requires no additional control logic or timing overhead.

What timing relationship exists between QVLD and the echo clocks CQ/CQ?

QVLD is edge-aligned with both CQ and CQ outputs: it asserts coincident with the rising edge of CQ that corresponds to the first valid word of a four-word read burst. This alignment eliminates the need for external delay tuning and guarantees that Q[35:0] data is valid within ±50 ps of the QVLD assertion edge - critical for reliable capture in FPGA-based receivers.