Infineon Technologies CY7C12501KV18-400BZXC

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 interface, 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 data width, 400 MHz clock support, DOFF-configurable latency mode, QVLD timing validation, and 165-ball FBGA package compatibility with high-density PCB layouts.

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 MT/s effective bandwidth.

The internal PLL ensures accurate data placement relative to echo clocks CQ/CQ, while QVLD provides edge-aligned validity indication. DOFF pin selects between 2.0-cycle (DOFF = HIGH) and 1-cycle (DOFF = LOW) read latency modes, allowing interoperability with legacy DDR I timing constraints.

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, CY7C12501KV18 offers double the data width per access, reducing bus cycles for wide-data transfers; versus AS7C362000B-400BIN, it adds critical timing control features (DOFF, QVLD) essential for robust high-speed system integration.

Availability

CY7C12501KV18 is available at Aetrix Electronics and suitable for network packet buffering, baseband signal processing, and high-speed test equipment requiring stable component supply, long-term lifecycle assurance, and full traceability.

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) designs high-performance memory and microcontroller solutions for demanding embedded and communications applications.

CY7C12501KV18 belongs to the DDR II+ SRAM product line, engineered specifically for ultra-low-latency, high-bandwidth memory subsystems in networking, wireless infrastructure, and test instrumentation.

FAQ

What is the function of the DOFF pin on CY7C12501KV18?

The DOFF (Double-Off) pin configures read latency mode: when asserted HIGH, it enables 2.0-cycle latency for optimal DDR II+ performance; when LOW, it reverts to 1-cycle latency compatible with DDR I timing. This pin must be held static during operation and is sampled only at initialization.

How does the ZQ pin affect output driver impedance?

ZQ connects to an external resistor to ground (RQ), enabling on-die calibration of DQ, CQ, and CQ output driver impedance to 0.2 × RQ. This achieves precise 25–50 Ω matching to PCB traces without external termination resistors, improving signal integrity at 900 MT/s.

Can CY7C12501KV18 operate with VDDQ = 1.5 V?

Yes - the device supports VDDQ from 1.4 V to 1.8 V, including 1.5 V. At 1.5 V, HSTL output drive strength is reduced versus 1.8 V, but remains compliant with HSTL Class I specifications; DC and AC timing parameters remain valid per datasheet Table 1.

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

QVLD is edge-aligned with CQ and CQ and asserts exactly when DQ[35:0] carries valid read data. It eliminates setup/hold uncertainty in FPGA or ASIC capture logic, allowing direct use as a data-valid strobe instead of relying on clock-phase assumptions or complex deskew circuits.