Cypress Semiconductor Corp CY7C2570KV18-450BZC

Overview

CY7C2570KV18 from Cypress Semiconductor is a 72-Mbit synchronous pipelined SRAM with DDR II+ architecture, configured as 2M × 36-bit, supporting 450 MHz operation (2.2 ns clock period), 2.5-cycle read latency, and on-die termination (ODT) for D[x:0], BWS[x:0], and K/K inputs. It delivers 1100 MT/s data throughput in networking packet buffers requiring deterministic low-latency burst access.

For engineers reviewing the CY7C2570KV18 datasheet, CY7C2570KV18 pinout, CY7C2570KV18 application, or CY7C2570KV18 equivalent, key selection criteria include its 2M × 36 organization, HSTL I/O compatibility with 1.4–1.8 V VDDQ, echo clock (CQ/CQ) timing alignment, QVLD data-valid signaling, and FBGA-165 package thermal and routing constraints.

Technical Context

This device implements a synchronous pipelined SRAM core with dual-edge DDR II+ interface: addresses latched on alternate rising edges of K/K clocks, write data registered on both K and K rising edges, and read data driven on both K and K rising edges. It uses a PLL for precise data placement and supports programmable ODT impedance selection via the ODT pin tied to ZQ reference resistor.

The CY7C2570KV18 operates with two distinct latency modes-2.5-cycle read latency when DOFF = HIGH (DDR II+ mode) or 1-cycle latency when DOFF = LOW (DDR I–compatible mode). Its 36-bit data bus is managed by four active-low byte write selects (BWS[3:0]), each controlling a 9-bit segment, enabling granular partial writes without read-modify-write cycles.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm body, 0.8 mm ball pitch, 1.4 mm height, RoHS-compliant Pb-free option available.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-bandwidth synchronous SRAM applications.

Compared with CY7C2568KV18, CY7C2570KV18 provides higher burst bandwidth (36-bit vs. 18-bit) at identical latency and clock rate; versus AS7C362000B-15JIN, it trades asynchronous simplicity for deterministic DDR timing, echo-clock synchronization, and integrated termination - essential for 450 MHz system-level signal integrity.

Availability

CY7C2570KV18 is available at Aetrix Electronics and suitable for networking packet buffers, telecom line card memory, high-speed test equipment memory, and industrial real-time controller cache requiring stable component supply across extended product lifecycles.

Supply support for CY7C2570KV18 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 automotive, industrial, and communications markets, with emphasis on signal integrity and timing precision.

The CY7C2570KV18 belongs to Cypress' DDR II+ SRAM product line, engineered specifically for deterministic, high-bandwidth buffering in packet-switched infrastructure where burst efficiency, ODT integration, and echo-clock timing alignment are critical.

FAQ

What is the function of the DOFF pin on CY7C2570KV18?

The DOFF (Double-Off) pin selects read latency mode: when asserted HIGH, it enables 2.5-cycle DDR II+ latency; when LOW, it configures the device for 1-cycle DDR I–compatible timing. This pin is sampled at power-up and remains static during operation - it is not dynamically switchable mid-operation. The mode affects internal pipeline staging but does not alter pinout, voltage, or clocking requirements.

How does the ZQ pin calibrate on-die termination?

The ZQ pin connects to an external 240 Ω ±1% resistor to ground. During power-up initialization, the device measures this reference to calibrate internal ODT resistance values and output driver strengths. Calibration occurs once per power cycle and adjusts all ODT-enabled pins (DQ, BWS, K/K) to match the target impedance. No periodic recalibration is required under stable thermal conditions.

Can CY7C2570KV18 operate with only one clock (K) instead of differential K/K?

No - the CY7C2570KV18 requires both K and K inputs for proper DDR II+ operation. The architecture relies on complementary clock edges to register write data and drive read data. Driving K only or shorting K/K violates timing specifications and causes undefined behavior. External clock generators must provide true differential LVDS- or HSTL-compatible K/K pairs with matched trace lengths.

What is the purpose of the QVLD signal and how is it timed?

QVLD (Valid Output Indicator) signals when read data on DQ[35:0] is valid and stable. It is edge-aligned with the CQ and CQ echo clocks - asserted coincident with the first rising edge of CQ that corresponds to valid data. This eliminates setup/hold uncertainty at the receiver, allowing latch enable generation directly from QVLD without fixed delay circuits or PLL-based deskew.