Cypress Semiconductor Corp CY7C1520KV18-333BZXI

Overview

CY7C1520KV18-333BZXI from Cypress Semiconductor is a 72-Mbit synchronous DDR-II SRAM configured as 2M × 36, operating at 333 MHz clock frequency with double-data-rate (666 MHz effective) I/O, 1.8 V core supply, and HSTL-compatible interfaces. It implements two-word burst addressing, echo clocks (CQ/CQ), and a PLL for precise data placement-used in high-bandwidth packet buffering and network switch fabric memory subsystems.

For engineers reviewing the CY7C1520KV18-333BZXI datasheet, CY7C1520KV18-333BZXI pinout, CY7C1520KV18-333BZXI application, or CY7C1520KV18-333BZXI equivalent, key selection criteria include DDR-II read latency (1.5 cycles with DOFF HIGH), dual-clock domain support (K/K and C/C), 165-ball FBGA package compatibility, and JTAG 1149.1 test access capability.

Technical Context

The CY7C1520KV18-333BZXI integrates a pipelined SRAM core with synchronous peripheral logic, using a 1-bit burst counter driven by A0 to generate sequential 36-bit word pairs on each access. All address, control, and write data inputs are registered on rising edges of complementary K/K clocks.

Read data is output-synchronized to rising edges of C/C clocks (or K/K in single-clock mode), with echo clocks CQ/CQ phase-aligned to C/C to simplify system-level timing capture. The device supports programmable output impedance via ZQ pin and operates with either 1.5 V or 1.8 V VDDQ, enabling interoperability with mixed-voltage DDR-I/II systems.

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch ball grid array (FBGA), 13 mm × 15 mm × 1.4 mm body, RoHS-compliant (Pb-free).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DDR-II SRAM applications.

Compared with AS7C3256A-15TIN and IS61WV102418BLL-10BLI, CY7C1520KV18-333BZXI uniquely delivers DDR-II bandwidth with deterministic echo-clock timing and field-configurable latency-critical for line-rate telecom and radar processing where jitter-sensitive burst transfers dominate.

Availability

CY7C1520KV18-333BZXI is available at Aetrix Electronics and suitable for telecom line cards, network switch buffers, test equipment memory, and radar signal processing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for CY7C1520KV18-333BZXI 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 system-level timing robustness.

CY7C1520KV18 belongs to Cypress's DDR-II synchronous SRAM product line, engineered specifically for deterministic, low-jitter, high-bandwidth buffering in packet-switched and real-time signal processing systems.

FAQ

What is the function of the DOFF pin on CY7C1520KV18-333BZXI?

The DOFF pin selects DDR-II read latency mode: when asserted HIGH, it enables 1.5-cycle latency for improved timing margin in high-speed systems; when LOW, it configures the device for 1-cycle DDR-I latency. This setting determines internal clock-to-output delay paths and must be held stable during operation.

Can CY7C1520KV18-333BZXI operate with only K and K clocks, without C and C?

Yes-the device supports single-clock mode where C and C are tied to K and K respectively. In this configuration, read data is output-synchronized to K/K edges, and echo clocks CQ/CQ derive from K/K. However, deskew capability and maximum timing margin are reduced compared to dual-clock operation.

How does the ZQ pin affect output drive strength?

The ZQ pin connects to an external 240 Ω resistor to ground, enabling on-die calibration of HSTL output drivers to match 50 Ω differential trace impedance. This adjusts output slew rate and termination, minimizing reflections and ensuring clean eye diagrams at 666 MT/s-no external series resistors required.

Is CY7C1520KV18-333BZXI pin-compatible with CY7C1518KV18-333BZXI?

No-they share the same 165-ball FBGA footprint but differ in pin assignment: CY7C1520KV18 uses BWS[3:0] and DQ[35:0], while CY7C1518 uses BWS[1:0] and DQ[17:0]. Address count also differs (21 vs. 22 pins), making direct substitution impossible without PCB redesign and firmware adaptation.