Cypress Semiconductor Corp CY7C1570KV18-500BZXC

Overview

CY7C1570KV18-500BZXC from Cypress Semiconductor is a 72-Mbit synchronous pipelined DDR II+ SRAM configured as 2M × 36, operating at 500 MHz with 2.5-cycle read latency and dual-edge DDR data transfer at 1000 Mbps. It features echo clocks (CQ/CQ), QVLD data-valid indicator, and programmable impedance matching via ZQ pin. Used in high-bandwidth networking line cards and FPGA co-processor buffers where deterministic low-latency burst access is required.

For engineers reviewing the CY7C1570KV18-500BZXC datasheet, CY7C1570KV18-500BZXC pinout, CY7C1570KV18-500BZXC application, or CY7C1570KV18-500BZXC equivalent, key selection criteria include DDR II+ timing compliance, 2.5-cycle vs. 1-cycle latency mode switching via DOFF, HSTL I/O compatibility, and FBGA-165 package thermal/mechanical constraints for dense PCB layouts.

Technical Context

This SRAM implements a two-word burst architecture with synchronous address latching on alternating K/K rising edges. Read data is driven on both K and K rising edges, synchronized to echo clocks CQ/CQ, enabling precise data capture without external strobes. The internal PLL ensures accurate data placement relative to clock edges when DOFF = HIGH.

All control inputs (R/W, LD, BWS[3:0]) are registered on K rising edge; data inputs DQ[35:0] are sampled on both K and K edges. Write operations use on-chip self-timed logic, while output tristating occurs automatically after deselection-critical for depth-expanded memory stacks without wait-state insertion.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C362000B-500BIN and IS61WV102436BLL-5BLI, CY7C1570KV18-500BZXC delivers 4× higher density and integrated timing aids (CQ/CQ, QVLD, ZQ), making it optimal for new 500 MHz DDR II+ designs where signal integrity and deterministic latency are non-negotiable.

Availability

CY7C1570KV18-500BZXC is available at Aetrix Electronics and suitable for high-speed network line cards, FPGA co-processor buffers, telecom baseband processing, and automated test equipment requiring stable component supply across extended product lifecycles.

Supply support for CY7C1570KV18-500BZXC 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) is a fabless semiconductor company specializing in high-performance memory, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

CY7C1570KV18 belongs to Cypress's QDR/DDR II+ SRAM product line, engineered specifically for applications demanding deterministic low-latency burst access, precise DDR timing control, and robust signal integrity in multi-gigabit memory interfaces.

FAQ

What is the function of the DOFF pin on CY7C1570KV18-500BZXC?

The DOFF (DLL/PLL Turn Off) pin is an active-low control that disables the internal phase-locked loop. When asserted LOW, the device reverts to DDR I timing with 1-cycle read latency and a maximum frequency of 167 MHz. When held HIGH (typically via 10 kΩ pull-up), DDR II+ mode activates with 2.5-cycle latency and full 500 MHz operation. This pin enables runtime mode switching for power/performance optimization.

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

The ZQ pin connects to an external precision resistor (RQ) tied to ground, enabling on-die calibration of DQ, CQ, and CQ output driver impedance to exactly 0.2 × RQ. This matches the memory's output impedance to the PCB trace impedance (typically 50 Ω), minimizing reflections and improving eye diagram margins without requiring discrete series or parallel termination resistors on the board.

Can CY7C1570KV18-500BZXC be used in depth-expanded memory configurations?

Yes - its automatic output tristating upon read deselect, combined with echo clock synchronization and deterministic 2.5-cycle latency, enables seamless depth expansion. When one device completes its burst and tristates, the next device in the stack can begin driving valid data on the same bus without wait states, provided LD and R/W are properly sequenced across devices using shared K/K clocks.

What is the significance of the QVLD signal in system timing design?

QVLD is a synchronous output that asserts edge-aligned with CQ and CQ to indicate when DQ[35:0] data is valid. Unlike fixed-delay assumptions, QVLD eliminates timing uncertainty in FPGA or ASIC capture logic - designers can use it directly as a latch enable, removing the need for manual delay tuning or IDELAYCTRL calibration in Xilinx/Intel devices operating above 500 Mbps per pin.