Cypress Semiconductor Corp CY7C25702KV18-500BZC

Overview

CY7C25702KV18 from Cypress Semiconductor is a 72-Mbit synchronous pipelined DDR II+ SRAM with 2M × 36 organization, 550 MHz clock support, 2.5-cycle read latency (DOFF = HIGH), on-die termination (ODT) for D[35:0]/BWS[3:0]/K/K, and HSTL I/O compatible with 1.4–1.8 V VDDQ. It serves as high-bandwidth buffer memory in network packet processors requiring precise DDR timing and echo-clock–synchronized data capture.

For engineers reviewing the CY7C25702KV18 datasheet, CY7C25702KV18 pinout, CY7C25702KV18 application, or CY7C25702KV18 equivalent, key selection criteria include burst depth (2-word), ODT configuration range (RQ/1.66 or RQ/3.33), QVLD timing alignment with CQ/CQ, and compatibility with 550 MHz K/K differential clocking in depth-expanded SRAM stacks.

Technical Context

This device implements a synchronous pipelined architecture where all address, control, and data signals are registered on rising edges of K (positive) and K (negative) clocks. Read operations initiate on K edge, deliver two sequential 36-bit words on alternating K/K edges, and assert QVLD edge-aligned with CQ/CQ to indicate valid output windows.

The integrated PLL ensures accurate data placement relative to echo clocks, while ODT supports programmable termination impedance via ZQ resistor and ODT pin state-enabling elimination of external resistors for D[35:0], BWS[3:0], and K/K inputs without signal integrity compromise at 1100 MT/s.

Key Specifications

Pinout & Package

Package: 165-ball FBGA (13 mm × 15 mm × 1.4 mm), RoHS-compliant, ball pitch 0.8 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C25682KV18, CY7C25702KV18 delivers full 36-bit width in one package-reducing interconnect count and skew-while AS7C362000B-15JIN lacks DDR timing, ODT, and echo clocks entirely, making it unsuitable for high-speed pipeline applications.

Availability

CY7C25702KV18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, baseband processing cache, and test equipment pattern memory requiring stable component supply across extended product lifecycles.

Supply support for CY7C25702KV18 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 focus on signal integrity and timing-critical systems.

CY7C25702KV18 belongs to the QDR II+ SRAM product line, engineered specifically for deterministic, low-latency, high-bandwidth memory interfaces in packet-switched infrastructure and real-time signal processing platforms.

FAQ

What is the function of the DOFF pin?

The DOFF (Double-Off) pin selects read latency mode: when asserted HIGH, the device operates in DDR II+ mode with 2.5-cycle read latency; when LOW, it reverts to DDR I mode with 1-cycle latency. This pin is sampled at power-up and latched synchronously to K, enabling runtime latency adaptation without reset.

How does ODT configuration interact with the ZQ pin?

ZQ connects to a precision 240 Ω resistor to ground and calibrates internal ODT driver strength. ODT pin state selects the calibration range: LOW enables RQ/3.33 (175–350 Ω), HIGH enables RQ/1.66 (175–250 Ω). The calibrated value applies to D[35:0], BWS[3:0], and K/K inputs simultaneously.

Can CY7C25702KV18 be used in depth-expanded configurations?

Yes-the device supports seamless depth expansion via shared K/K clocks and automatic tri-state control on deselection. When one device completes its read burst, its outputs tri-state on the next K rising edge, allowing immediate access to the next device without wait states or external bus arbitration logic.

What is the timing relationship between QVLD and CQ/CQ?

QVLD is edge-aligned with both CQ and CQ rising edges, with propagation delay matching within ±0.05 ns. This alignment ensures that QVLD assertion precisely coincides with the center of the valid data window established by CQ/CQ, enabling reliable latch enable generation in FPGA or ASIC capture logic.