Infineon Technologies CY7C1525KV18-250BZXIT

Overview

CY7C1525KV18-250BZXIT from Cypress Semiconductor is an 8M × 9 (72-Mbit) QDR® II SRAM with synchronous pipelined architecture, dual independent read/write ports, 250 MHz operation (40 ns clock period), DDR interfaces on both ports (500 Mbps per pin), and 1.8V core / 1.4–1.8V I/O supply. It delivers high-bandwidth buffering for network packet processing in telecom line cards.

For engineers reviewing the CY7C1525KV18-250BZXIT datasheet, CY7C1525KV18-250BZXIT pinout, CY7C1525KV18-250BZXIT application, or CY7C1525KV18-250BZXIT equivalent, key selection criteria include burst depth (2-word), read latency (1 or 1.5 cycles depending on DOFF), echo clock support (CQ/CQ), JTAG 1149.1 compliance, and FBGA-165 package compatibility with high-speed PCB layout constraints.

Technical Context

This SRAM implements true QDR II architecture: separate read and write data paths eliminate bus turnaround delays, enabling concurrent read and write transactions at full bandwidth. Address latching occurs on alternating rising edges of K/K clocks, while C/C clocks control output register timing to minimize skew.

The device integrates a PLL for precise data placement, supports programmable impedance via ZQ pin, and uses synchronous self-timed writes with byte-level write enable (BWS0 only, since x9 configuration). DOFF pin selects between 1-cycle (LOW) and 1.5-cycle (HIGH) read latency modes - critical for deterministic timing in pipeline-constrained systems.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body height, RoHS-compliant Pb-free finish (BZXIT suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10BG and IS61WV102418BLL-10BLI, CY7C1525KV18-250BZXIT uniquely delivers DDR bandwidth at 250 MHz with echo clocks and configurable latency - making it optimal for new high-speed packet-processing architectures where timing precision and concurrency are mandatory.

Availability

CY7C1525KV18-250BZXIT is available at Aetrix Electronics and suitable for telecom infrastructure, network processor co-design, baseband radio development, and high-speed test equipment requiring stable component supply and long-term lifecycle assurance.

Supply support for CY7C1525KV18-250BZXIT 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.

This device belongs to the QDR® II SRAM product line, engineered specifically for deterministic, high-bandwidth memory interfacing in packet-switched systems where concurrent access and sub-ns timing control are essential.

FAQ

What is the function of the DOFF pin on CY7C1525KV18-250BZXIT?

The DOFF (Data Output OFFset) pin selects read latency mode: when asserted HIGH, it enables 1.5-cycle read latency for improved timing margin in systems with longer clock-to-data flight times; when LOW, it configures 1-cycle latency for minimal pipeline delay. This setting directly affects the number of clock cycles between address assertion and valid Q[8:0] output.

Does CY7C1525KV18-250BZXIT support single-ended clocking?

No - the device requires differential clock pairs (K/K and C/C) for proper operation. Both K and K must be driven with complementary signals; using only one degrades timing performance and violates AC specifications. The architecture relies on edge-aligned dual-clock domains to manage read/write address latching and output registration.

How is byte write control implemented in the 8M × 9 configuration?

In CY7C1525KV18-250BZXIT, only BWS0 is used for byte write enable - it controls all 9 bits simultaneously. Unlike x8 or x18 variants, this x9 configuration does not support nibble- or sub-byte write granularity; asserting BWS0 LOW enables writing the full 9-bit word, while HIGH disables all bits in that access.

Can the ZQ pin be left unconnected if impedance calibration is not required?

No - ZQ must be connected to a 240 Ω ±1% resistor to ground for HSTL output driver calibration. Leaving it floating causes undefined output drive strength, leading to signal integrity failures including overshoot, undershoot, and timing violations at 500 Mbps. The calibration occurs automatically at power-up and during operation.