Cypress Semiconductor Corp CY7C12501KV18-400BZC

Overview

CY7C12501KV18 from Cypress Semiconductor is a 36-Mbit DDR II+ SRAM configured as 1M × 36, operating at up to 400 MHz with 2.0-cycle read latency, HSTL I/O, and dual echo clocks (CQ/CQ) for precise data capture in high-speed memory subsystems used in network packet buffers and baseband processing.

For engineers reviewing the CY7C12501KV18 datasheet, CY7C12501KV18 pinout, CY7C12501KV18 application, or CY7C12501KV18 equivalent, key selection criteria include 1M × 36 bus width support, 400 MHz clock frequency, DOFF-configurable latency mode, QVLD timing alignment, and 165-ball FBGA (13 × 15 × 1.4 mm) mechanical compatibility.

Technical Context

This device implements a synchronous pipelined SRAM core with DDR II+ architecture, using two independent input clocks (K and K) to latch addresses and register write data on alternating rising edges. Read data is driven synchronously on both K and K edges, enabling true double-data-rate operation at 900 Mbps effective data rate.

The integrated PLL ensures accurate data placement relative to echo clocks CQ/CQ, while QVLD provides edge-aligned validity indication. Byte write select inputs (BWS[3:0]) enable granular 8-bit writes across the full 36-bit data bus without disturbing adjacent bytes.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C12481KV18 and AS7C336000B-400BIN, CY7C12501KV18 uniquely combines 36-bit width, echo-clock–assisted timing, and QVLD–guided capture - reducing system-level timing margin risk in FPGA-based high-speed designs.

Availability

CY7C12501KV18 is available at Aetrix Electronics and suitable for telecom infrastructure, wireless baseband processing, and industrial vision systems requiring stable component supply, long-lifecycle support, and guaranteed FBGA package availability.

Supply support for CY7C12501KV18 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 programmable analog/digital ICs for industrial, automotive, and communications markets.

CY7C12501KV18 belongs to the DDR II+ SRAM product line, designed specifically for high-bandwidth, low-latency buffering in networking and wireless infrastructure where deterministic timing and wide data paths are essential.

FAQ

What is the function of the DOFF pin on CY7C12501KV18?

The DOFF (Data-Off) pin configures read latency mode: when asserted HIGH, it enables 2.0-cycle DDR II+ latency; when LOW, it selects 1.0-cycle DDR I–compatible latency. This pin is sampled synchronously on the rising edge of the K clock during initialization and remains latched until reset or power cycle.

How does the ZQ pin calibrate output impedance?

ZQ connects to an external 240 Ω resistor to ground, allowing internal circuitry to adjust driver output impedance to 48 Ω (0.2 × 240 Ω). This calibration ensures consistent signal integrity across voltage and temperature variations and matches typical PCB trace impedances without requiring external series resistors.

Can CY7C12501KV18 operate with only one clock input (K only)?

No. The device requires both K and K inputs - they are complementary and used together for address latching, data registration, and output timing. Driving only K while leaving K floating or grounded violates AC timing specifications and will cause functional failure; both must be driven with proper differential swing and phase relationship.

What is the purpose of the QVLD signal in system-level timing?

QVLD is edge-aligned with the CQ and CQ echo clocks and indicates exactly when valid read data appears on DQ[35:0]. It eliminates setup/hold uncertainty at the receiving device (e.g., FPGA input register), enabling reliable capture without manual timing margining or delay-chain tuning in high-speed designs.