Cypress Semiconductor Corp CY7C1525V18-200BZC

Overview

CY7C1525V18 from Cypress Semiconductor is an 8M × 9 (72-Mbit), 1.8V QDR-II SRAM with separate read/write ports, 250 MHz clock operation, DDR interfaces on both ports (500 MT/s effective data rate), and 165-ball FBGA (15 × 17 × 1.4 mm) packaging. It delivers full data coherency and synchronous self-timed writes for high-throughput packet buffering in network line cards.

For engineers reviewing the CY7C1525V18 datasheet, CY7C1525V18 pinout, CY7C1525V18 application, or CY7C1525V18 equivalent, key selection criteria include its dual-clock DDR timing architecture, 9-bit wide x8M depth configuration, HSTL I/O compatibility, echo clock support (CQ/CQ), and JTAG 1149.1 test access.

Technical Context

The CY7C1525V18 implements a true QDR-II architecture with physically independent read and write data paths-no bus turnaround required. Its 2-word burst transfers occur on every rising edge of K/K (write) and C/C (read), enabling concurrent read/write operations at full bandwidth.

It uses a Delay Lock Loop (DLL) for precise output data placement relative to C/C clocks, and supports echo clocks (CQ/CQ) referenced to C/C to simplify high-speed data capture. Address inputs are multiplexed across both ports, latched on alternating edges of K/K, reducing pin count while maintaining full port independence.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm × 1.4 mm body, 1.0 mm ball pitch, RoHS-compliant.

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, the CY7C1525V18 provides 2× higher effective bandwidth, 1.8V core power savings, and hardware-assisted timing deskew-critical for 10G+ packet processing but requires tighter layout control for DDR clock routing.

Availability

CY7C1525V18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, high-speed test equipment, and avionics data recorders requiring stable component supply and long-term industrial temperature support.

Supply support for CY7C1525V18 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.

The QDR-II SRAM product line targets high-throughput, low-latency memory subsystems in packet-switched infrastructure-optimized for deterministic concurrent access and signal integrity at >500 MT/s.

FAQ

What is the function of the ZQ pin on CY7C1525V18?

The ZQ pin calibrates the output driver impedance of Q[8:0], CQ, and CQ to match the system data bus. It must be connected to a precision resistor (typically 100 Ω) to ground; connecting directly to VDDQ enables minimum impedance mode. Leaving ZQ floating or tied to GND violates specification and causes output timing violations.

Can CY7C1525V18 operate in single-clock mode?

Yes-when C and C are tied together and driven by K (or K), the device enters single-clock mode. In this mode, Q[8:0] is clocked by K/K, CQ/CQ are derived from K/K, and all timing references shift to the K clock domain. The DLL remains active unless disabled via DOFF.

How does the BWS0 signal differ from NWS0/NWS1 in CY7C1525V18?

CY7C1525V18 uses BWS0 (Byte Write Select) for full 9-bit write enable-there is no nibble-level select. NWS0/NWS1 exist only in the x8 variant (CY7C1510V18) to control D[3:0] and D[7:4]. BWS0 assertion enables writing all 9 bits; deassertion holds the entire word unchanged.

Is the DOFF pin required to be connected for normal operation?

No-DOFF is optional. When left unconnected or pulled HIGH, the internal DLL operates normally for precise output timing. Pulling DOFF LOW disables the DLL, reverting to basic flip-flop output timing with increased jitter and reduced timing margin; this mode is not recommended for 250 MHz operation.