Infineon Technologies CY7C1512AV18-250BZIT

Overview

CY7C1512AV18-250BZIT from Cypress Semiconductor is a 4M × 18 (72-Mbit), 1.8V QDR® II SRAM with separate read/write ports, 250 MHz clock operation, 2-word burst transfers, DDR interfaces on both ports (500 MT/s effective data rate), and 1.5-cycle read latency with DLL enabled. It serves as high-bandwidth buffer memory in network packet processors requiring concurrent access without bus turnaround.

For engineers reviewing the CY7C1512AV18-250BZIT datasheet, CY7C1512AV18-250BZIT pinout, CY7C1512AV18-250BZIT application, or CY7C1512AV18-250BZIT equivalent, key selection criteria include its dual-clock DDR timing architecture, HSTL-18 I/O compliance, 165-ball FBGA package, DLL-controlled latency mode, and depth expansion via RPS/WPS port selects.

Technical Context

This SRAM implements a synchronous pipelined QDR II architecture with physically independent read and write data paths, eliminating bus turnaround overhead. Its dual-edge DDR I/O uses K/K for input capture and C/C for output timing, with echo clocks CQ/CQ referenced to C/C to compensate for flight-time skew in high-speed backplanes.

The device supports two operational modes: DLL-enabled (1.5-cycle read latency, up to 250 MHz) and DLL-disabled (1-cycle latency, QDR I timing, max 167 MHz). Address multiplexing across shared A[20:0] pins enables 4M-depth addressing while minimizing pin count, and byte write select BWS[1:0] allows partial-word writes without read-modify-write cycles.

Key Specifications

Pinout & Package

165-ball Fine-Pitch Ball Grid Array (FBGA) package, 15 mm × 17 mm × 1.4 mm body height, 0.8 mm ball pitch, Pb-free compatible. Pinout optimized for signal integrity with dedicated VDDQ/VSS planes, distributed ZQ impedance calibration, and echo clock pairs adjacent to data groups.

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 IS61WV102418B, CY7C1512AV18-250BZIT delivers 2× higher bandwidth (500 vs. 334 MT/s) and deterministic dual-port concurrency, but requires DLL tuning and tighter layout for echo clock routing-making it optimal for new high-speed data plane designs.

Availability

CY7C1512AV18-250BZIT 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 and long-term industrial availability.

Supply support for CY7C1512AV18-250BZIT 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 U.S.-based semiconductor company specializing in high-performance memory, microcontrollers, and programmable analog/digital ICs for industrial, automotive, and communications markets.

CY7C1512AV18 belongs to Cypress's QDR II SRAM product line, engineered specifically for deterministic, low-latency, concurrent-access memory subsystems in networking and telecom infrastructure where bus turnaround overhead must be eliminated.

FAQ

What is the function of the DOFF pin on CY7C1512AV18-250BZIT?

The DOFF (DLL Turn Off) pin is an active-low control that disables the internal Delay Lock Loop. When pulled LOW, the device operates in QDR I mode with 1-cycle read latency and a maximum frequency of 167 MHz. When pulled HIGH (typically via 10 kΩ pull-up), DLL is enabled, supporting 250 MHz operation and 1.5-cycle latency. This pin directly determines timing mode and frequency ceiling.

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

The ZQ pin connects to an external resistor to ground (typically 50 Ω) to calibrate the output driver impedance of Q[17:0], CQ, and CQ signals. This ensures matched 50 Ω drive strength to the PCB trace, minimizing reflections and maintaining signal integrity at 500 MT/s. Leaving ZQ unconnected or tied to GND violates specification and causes undefined output drive levels.

Can CY7C1512AV18-250BZIT operate with a single clock domain?

Yes-it supports Single Clock Mode where only K/K clocks control both input registers (D[17:0], RPS, WPS) and output registers (Q[17:0]). In this mode, C/C are unused, and data is driven on K/K edges. However, this sacrifices echo clock benefits and increases timing margin pressure; dual-clock mode with C/C and CQ/CQ is recommended for >200 MHz operation.

What is the purpose of BWS[1:0] in write operations?

BWS[1:0] (Byte Write Select) enables partial-word writes without read-modify-write cycles. BWS0 controls D[8:0], BWS1 controls D[17:9]. When either is deasserted, the corresponding 9-bit byte remains unchanged in memory. This is critical for updating packet headers or metadata fields within larger data structures while preserving adjacent payload bytes.