Cypress Semiconductor Corp CY7C1523AV18-200BZC

Overview

CY7C1523AV18 from Cypress Semiconductor is a 72-Mbit (4M × 18) synchronous pipelined SRAM with DDR-II Separate I/O architecture, operating at 200 MHz clock frequency (400 MT/s effective data rate), supporting 2-word burst reads/writes, and featuring dual input clocks (K/K) and dual output clocks (C/C) for precise timing control in high-speed memory subsystems. It is used in network packet buffering, baseband processing, and FPGA co-processor cache layers requiring low-latency, high-bandwidth parallel memory access.

For engineers reviewing the CY7C1523AV18 datasheet, CY7C1523AV18 pinout, CY7C1523AV18 application, or CY7C1523AV18 equivalent, key selection criteria include DDR-II SIO interface compatibility, 1.8V core/VDDQ operation, HSTL I/O compliance, DLL-enabled 1.5-cycle read latency, and 165-ball FBGA (15 × 17 mm) mechanical fit in space-constrained telecom and test equipment designs.

Technical Context

This SRAM implements a true separate I/O DDR architecture: independent read and write ports eliminate bus turnaround delay, and address latching occurs on alternating rising edges of K/K to support 2-word burst addressing. Internal pipelining enables continuous burst throughput without inter-burst gaps.

Synchronous operation relies on four critical clock domains: K/K for address/control/data input registration, C/C for output data registration, CQ/CQ echo clocks synchronized to C/C for receiver-side deskewing, and optional DLL activation via DOFF pin to align internal timing paths for 300 MHz–capable operation (DLL enabled) or fallback to DDR-I timing at ≤167 MHz (DLL disabled).

Key Specifications

Pinout & Package

165-ball Fine-Pitch Ball Grid Array (FBGA) package, 15 mm × 17 mm footprint, 1.4 mm height, RoHS-compliant, with 0.8 mm ball pitch and standard JEDEC MO-245AC mechanical outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61WV102418B and R1EX24012AS, CY7C1523AV18 uniquely combines DLL-enabled 1.5-cycle latency, echo-clock–assisted deskewing, and dual-byte write select-making it optimal for systems demanding both timing precision and flexible partial-word update capability at 200 MHz.

Availability

CY7C1523AV18 is available at Aetrix Electronics and suitable for network infrastructure, FPGA acceleration, baseband processing, and automated test equipment requiring stable component supply across extended production lifecycles.

Supply support for CY7C1523AV18 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 logic solutions for industrial, automotive, and communications markets.

CY7C1523AV18 belongs to Cypress's DDR-II SIO SRAM product line, designed specifically for high-bandwidth, low-latency memory subsystems in networking, test, and signal processing equipment where deterministic timing and scalable parallel interfaces are essential.

FAQ

What is the function of the DOFF pin, and how does it affect timing?

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 DDR-I mode with 1-cycle read latency and reduced maximum frequency (≤167 MHz). When HIGH, DLL is enabled, supporting 1.5-cycle latency and full 200 MHz operation. This pin allows runtime mode switching without changing clock frequencies or controller firmware.

Can CY7C1523AV18 operate with only K and K clocks, without C and C?

Yes. In single-clock mode, the device uses K and K for both input registration and output data timing-driving Q[17:0] on rising edges of K/K instead of C/C. However, echo clocks (CQ/CQ) remain functional and phase-aligned to K/K, preserving deskew capability. This mode simplifies clock distribution but forfeits independent read/write clock domain separation.

How many address lines are required, and what is their multiplexing behavior?

CY7C1523AV18 requires 21 address lines (A[20:0]) to access its 4M-word array. Addresses are multiplexed across read and write operations and latched on alternating rising edges of K/K-first edge captures the base address, second edge captures the burst offset. No external address multiplexer is needed; internal logic handles 2-word burst sequencing automatically.

What is the purpose of the ZQ pin, and how must it be connected?

ZQ is an impedance calibration reference pin. It must be connected to a 240 Ω resistor tied to ground to calibrate output driver strength for Q[17:0], CQ, and CQ to match 50 Ω transmission lines. Alternatively, tying ZQ to VDDQ enables minimum impedance mode (≈30 Ω). Leaving ZQ floating or connecting it to VSS violates specification and causes undefined output drive behavior.