Infineon Technologies CY7C1320KV18-250BZXC

Overview

CY7C1320KV18-250BZXC from Cypress Semiconductor is a 18-Mbit DDR II synchronous SRAM configured as 512K × 36, operating at 250 MHz with 500 MT/s effective data rate via double-data-rate interface. It features two-word burst architecture, echo clocks (CQ/CQ), and programmable output impedance via ZQ pin. Designed for high-bandwidth buffering in network packet processors and telecom line cards.

For engineers reviewing the CY7C1320KV18-250BZXC datasheet, CY7C1320KV18-250BZXC pinout, CY7C1320KV18-250BZXC application, or CY7C1320KV18-250BZXC equivalent, key selection criteria include 250 MHz clock frequency, 512K × 36 organization, HSTL I/O compatibility, 1.8 V core supply, and FBGA-165 package mechanical constraints.

Technical Context

This SRAM implements a synchronous pipelined architecture with internal burst counter driven by A0, delivering two consecutive 36-bit words per access. Read latency is 1.5 cycles when DOFF = HIGH (DDR II mode) or 1 cycle when DOFF = LOW (DDR I mode).

It uses dual input clocks (K/K) for address/control latching and dual output clocks (C/C) with corresponding echo clocks (CQ/CQ) to compensate for board-level flight time skew. All data inputs and outputs are registered to respective clock edges, and output drive strength is calibrated via external ZQ resistor.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body height, RoHS-compliant, Pb-free option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C331024B-250BIN and IS61WV102436BLL-250BLI, CY7C1320KV18-250BZXC uniquely delivers echo clocks for simplified high-speed capture, ZQ-based impedance tuning for signal integrity, and DOFF-configurable latency-critical for systems where timing margin and board-level signal integrity are constrained.

Availability

CY7C1320KV18-250BZXC is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, baseband processing cache, and radar signal processing FIFO applications requiring stable component supply and long-term production continuity.

Supply support for CY7C1320KV18-250BZXC 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

Cypress Semiconductor (now part of Infineon Technologies) designs high-performance memory and programmable solutions for communications, industrial, and automotive markets, with emphasis on signal integrity and system-level timing robustness.

The CY7C13xxKV18 family targets high-speed networking and real-time signal processing systems requiring deterministic DDR-II SRAM performance with minimal controller-side timing compensation logic.

FAQ

What is the function of the DOFF pin on CY7C1320KV18-250BZXC?

The DOFF (DDR Off) pin selects read latency mode: when asserted HIGH, the device operates in DDR II mode with 1.5-cycle latency; when LOW, it reverts to DDR I mode with 1-cycle latency. This enables compatibility with legacy controllers while allowing optimized timing in new designs. The pin is sampled synchronously on the K clock edge during initialization.

Can CY7C1320KV18-250BZXC operate without external C and C clocks?

Yes - the device supports single-clock mode using only K and K for both input and output timing. In this configuration, read data is driven on K/K rising edges, and CQ/CQ are generated relative to K/K. However, echo clock functionality and optimal deskew capability require external C/C signals.

How is output impedance calibrated using the ZQ pin?

ZQ connects to an external precision resistor (typically 240 Ω) tied to ground. During calibration, the device measures this resistance and adjusts its DQ and CQ output driver strength to deliver 0.2 × RQ (e.g., 48 Ω). Direct connection to VDDQ enables minimum impedance mode (~30 Ω); floating or grounding ZQ is prohibited.

Is CY7C1320KV18-250BZXC pin-compatible with other members of the CY7C13xxKV18 family?

No - CY7C1320KV18 (512K × 36) and CY7C1318KV18 (1M × 18) share the same 165-ball FBGA package and pinout, but differ in address width (19 vs. 20 bits), BWS count (4 vs. 2), and DQ width (36 vs. 18). Interchange requires PCB layout revision and firmware address mapping changes.