Infineon Technologies CY7C1425AV18-167BZXC

Overview

CY7C1425AV18-167BZXC from Cypress Semiconductor is a 4M × 9 (36-Mbit) QDR-II™ SRAM with independent read/write ports, 167 MHz maximum clock frequency, 1.8 V core supply, and 1.4–1.8 V I/O supply. It delivers concurrent 2-word burst transfers at 334 MT/s per port using DDR interfaces on both K/K and C/C clock domains, targeting high-bandwidth packet buffering in network line cards.

For engineers reviewing the CY7C1425AV18-167BZXC datasheet, CY7C1425AV18-167BZXC pinout, CY7C1425AV18-167BZXC application, or CY7C1425AV18-167BZXC equivalent, key selection criteria include its 9-bit data width, 165-ball FBGA package, HSTL-compatible I/Os, DLL-controlled timing accuracy, and support for depth expansion via WPS/RPS and BWS0 control.

Technical Context

The device implements a synchronous pipelined QDR-II architecture with physically separate read and write data paths, eliminating bus turnaround delays. Address latching occurs on rising edges of dedicated K (read) and K (write) clocks, while output data is synchronized to C/C echo clocks to minimize skew across high-speed PCB traces.

Internally, it uses a dual 2M × 9 memory array with on-chip self-timed write circuitry and a Delay Lock Loop (DLL) for precise 500 Mbps DDR edge placement. All synchronous inputs pass through registers clocked by K/K, and all outputs are registered to C/C, ensuring deterministic setup/hold timing at 167 MHz operation.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm × 1.4 mm body, RoHS-compliant lead-free finish (BZXC suffix).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar QDR-II SRAM applications.

Compared with CY7C1425AV18-200BZXC, this part trades peak bandwidth for lower power and relaxed timing; compared with AS7C336818A-167BIN, it provides superior signal integrity via HSTL I/O, DLL, and echo clocks-critical for >10 cm trace lengths in telecom infrastructure.

Availability

CY7C1425AV18-167BZXC is available at Aetrix Electronics and suitable for high-speed packet buffering, network switch fabric memory, baseband processing memory, and FPGA co-processor cache applications requiring stable component supply across extended production lifecycles.

Supply support for CY7C1425AV18-167BZXC 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 systems, with headquarters in San Jose, CA.

This device belongs to the QDR-II SRAM product line, engineered specifically for deterministic, low-latency, full-duplex memory access in packet-switched infrastructure equipment operating at OC-192 and beyond.

FAQ

What is the function of the ZQ pin on CY7C1425AV18-167BZXC?

The ZQ pin is an output impedance calibration input that connects to a 240 Ω resistor to ground. It adjusts the HSTL driver output impedance to match 50 Ω transmission lines, ensuring signal integrity across high-speed PCB traces. Leaving ZQ unconnected or tying it to GND violates the specification and causes undefined drive strength.

Can CY7C1425AV18-167BZXC operate with only a single clock domain?

Yes-it supports single-clock mode where K and C are tied together, and K and C are tied together. In this configuration, data is clocked out on K/K edges instead of C/C, simplifying clock tree design at the cost of reduced flight-time deskew capability. The DLL remains active and aligns output timing to the combined clock.

How does the BWS0 signal differ from NWS signals in other QDR-II parts?

BWS0 is a single active-low byte write select controlling all 9 bits of D[8:0]. Unlike NWS0/NWS1 in x8 devices (which mask nibbles), BWS0 provides coarse-grained 9-bit write enable-no partial-byte masking is supported. It is sampled synchronously with D[8:0] on the rising edge of K during write operations.

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

No-DOFF is an optional DLL disable input. When left unconnected or pulled HIGH, the DLL operates normally. Only connect DOFF to GND if system-level timing analysis confirms DLL-free operation meets setup/hold requirements; doing so invalidates all DLL-dependent AC timing parameters in the datasheet.