Infineon Technologies CY7C1623KV18-250BZXC

Overview

CY7C1623KV18-250BZXC from Infineon Technologies (formerly Cypress) is a 144-Mbit (8 M × 18) DDR-II Synchronous Pipelined SRAM with Separate I/O architecture, operating at 250 MHz clock frequency (500 MT/s effective data rate), 1.8 V core supply, HSTL I/O, and 165-ball FBGA (15 × 17 × 1.4 mm) package. It supports two-word burst reads/writes, echo clocks (CQ/CQ), and programmable impedance via ZQ pin for high-speed memory subsystems in networking line cards and packet buffering applications.

For engineers reviewing the CY7C1623KV18-250BZXC datasheet, CY7C1623KV18-250BZXC pinout, CY7C1623KV18-250BZXC application, or CY7C1623KV18-250BZXC equivalent, key selection criteria include DDR-II SIO timing compliance, DOFF-controlled DDR-I/DDR-II mode switching, C/C and CQ/CQ clock pair routing, HSTL drive strength configuration, and 1.8 V core + flexible VDDQ (1.4–1.8 V) power domain management.

Technical Context

The device implements a synchronous pipelined architecture with independent read and write ports sharing a common address bus. Address latching occurs on alternating rising edges of complementary K/K clocks, while write data is registered on both K and K edges - enabling true DDR write capture without bus turnaround.

Read data is output-synchronized to C/C clocks (or K/K in single-clock mode), with echo clocks CQ/CQ phase-aligned to C/C to eliminate board-level skew. The internal PLL ensures precise data placement, and DOFF pin selection determines whether operation follows DDR-II (1.5-cycle latency, 250 MHz max) or DDR-I (1-cycle latency, 167 MHz max) timing models.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm × 1.4 mm body, RoHS-compliant, Pb-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C3256B-25JCIN and IS61WV102418BLL-15BLI, CY7C1623KV18-250BZXC delivers 5× higher effective bandwidth, eliminates bus turnaround delays, and provides on-die impedance calibration - making it uniquely suited for DDR-II–based packet processing pipelines.

Availability

CY7C1623KV18-250BZXC is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, high-speed test equipment memory, and industrial protocol gateway buffer applications requiring stable component supply and long-term lifecycle support.

Supply support for CY7C1623KV18-250BZXC 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

Infineon Technologies acquired Cypress Semiconductor in 2020 and maintains its high-performance memory portfolio, including legacy SRAMs optimized for deterministic timing and signal integrity in infrastructure applications.

This part belongs to the Cypress DDR-II SIO SRAM product line, designed specifically for high-throughput, low-latency memory subsystems in networking, telecom, and test equipment where bus turnaround elimination and echo-clock–assisted data capture are critical.

FAQ

What is the function of the DOFF pin, and how does it affect timing?

The DOFF pin controls the internal PLL: when asserted HIGH, the device operates in DDR-II mode with 1.5-cycle read latency and supports up to 250 MHz clock frequency; when LOW, the PLL is disabled and the device reverts to DDR-I timing with 1-cycle latency and a maximum clock of 167 MHz. This allows system-level flexibility to trade latency for bandwidth or maintain operation under marginal voltage/temperature conditions.

How are CQ and CQ echo clocks used in system design?

CQ and CQ are free-running output clocks synchronized to C and C respectively, and are intended to be routed alongside Q[17:0] signals to the memory controller. They provide source-synchronous timing references that eliminate the need for per-device flight-time compensation, enabling robust data capture at 500 MT/s without complex receiver deskew logic or training sequences.

Can CY7C1623KV18-250BZXC operate with only one clock (K) instead of K/K?

No - the device requires both K and K differential clock inputs for all synchronous operations. The K/K pair is used to latch addresses, control signals, and write data; omitting either clock violates setup/hold timing and causes undefined behavior. In single-clock-domain systems, K and K must still be supplied as complementary signals derived from the same source.

What is the purpose of the ZQ pin, and how should it be connected?

ZQ enables on-die output impedance calibration: connecting an external resistor (typically 240 Ω) between ZQ and GND sets driver impedance to 0.2 × RQ (e.g., 48 Ω), matching standard PCB trace impedances. Leaving ZQ unconnected or tying it to GND is prohibited; connecting to VDDQ enables minimum-impedance mode but forfeits calibration accuracy.