Infineon Technologies CY7C1512AV18-250BZC

Overview

CY7C1512AV18-250BZC from Cypress Semiconductor is a 4M × 18 (72-Mbit), 1.8V QDR® II SRAM with dual independent read/write ports, 250 MHz clock operation, 1.5-cycle read latency (DLL enabled), and DDR interfaces on both ports delivering 500 MT/s effective data rate. It implements synchronous pipelined burst architecture for high-bandwidth networking buffer applications requiring zero bus turnaround.

For engineers reviewing the CY7C1512AV18-250BZC datasheet, CY7C1512AV18-250BZC pinout, CY7C1512AV18-250BZC application, or CY7C1512AV18-250BZC equivalent, key selection criteria include 165-ball FBGA package compatibility, HSTL-18 I/O compliance, DLL-enabled timing mode, echo clock (CQ/CQ) support for source-synchronous capture, and depth expansion via RPS/WPS port selects.

Technical Context

This QDR II SRAM uses separate K/K input clocks for address/data capture and C/C output clocks for data launch, enabling precise DDR timing control and eliminating bus contention. Its internal architecture comprises two 2M × 18 memory arrays with multiplexed address latching on alternating K-clock edges.

The device supports both DLL-on (1.5-cycle read latency, up to 250 MHz) and DLL-off (1-cycle latency, QDR I mode, up to 167 MHz) operation via the DOFF pin. Echo clocks CQ/CQ are free-running and synchronized to C/C, simplifying high-speed data capture in multi-device systems.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 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 QDR II SRAM applications.

Compared with IDT72T3615L10BG and IS61WV102418B, CY7C1512AV18-250BZC delivers 4× higher density, 2.5× higher bandwidth, and integrated echo-clock timing-making it uniquely suitable for next-generation packet-switched infrastructure requiring deterministic, full-duplex memory access.

Availability

CY7C1512AV18-250BZC is available at Aetrix Electronics and suitable for packet buffering in Layer 2/3 switches, high-speed network interface controllers, and telecom line card buffers requiring stable component supply across multi-year production cycles.

Supply support for CY7C1512AV18-250BZC 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 connectivity solutions for industrial, automotive, and communications markets.

CY7C1512AV18 belongs to Cypress's QDR II SRAM product line, engineered specifically for high-bandwidth, low-latency buffering in packet-switched networking equipment where deterministic timing and concurrent read/write throughput are critical.

FAQ

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

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 maximum frequency reduced to 167 MHz. For standard QDR II operation at 250 MHz with 1.5-cycle latency, DOFF must be held HIGH via a ≤10 kΩ pull-up to VDDQ.

How does the ZQ pin affect output drive strength and signal integrity?

The ZQ pin calibrates the output impedance of Q[17:0] and CQ/CQ signals to match the system data bus. Connecting ZQ to a precision resistor (RQ) to ground sets output impedance to 0.2 × RQ. Direct connection to VDDQ enables minimum impedance mode. ZQ must never be left floating or tied to VSS, as this disables impedance control and risks signal integrity failure.

Can CY7C1512AV18-250BZC operate in single-clock mode, and how is it configured?

Yes-it supports single-clock mode using only K/K for both input registration and output launch (replacing C/C). To enable, tie C and C to K and K respectively, and configure the device to use K/K as the sole timing reference. In this mode, data output timing follows K/K edges, simplifying clock routing at the cost of reduced deskew capability versus dual-clock mode.

What is the purpose of the BWS[1:0] pins, and how do they enable byte-level writes?

BWS0 and BWS1 are active-low byte write selects that gate D[8:0] and D[17:9], respectively. During each 18-bit write burst, asserting either BWS pin allows corresponding byte lanes to be updated while leaving unselected bytes unchanged. This enables efficient partial-word writes-critical for modifying packet headers or status fields without full-word read-modify-write cycles.