Infineon Technologies CY7C1426AV18-167BZXC

Overview

CY7C1426AV18-167BZXC from Cypress Semiconductor is a 36-Mbit QDR-II SRAM with 4M × 9 organization, operating at 167 MHz (600 Mbps DDR data rate), featuring separate read/write ports, echo clocks (CQ/CQ), and HSTL I/O for high-speed networking buffers and packet memory in telecom line cards.

For engineers reviewing the CY7C1426AV18-167BZXC datasheet, CY7C1426AV18-167BZXC pinout, CY7C1426AV18-167BZXC application, or CY7C1426AV18-167BZXC equivalent, key selection criteria include burst depth (4-word), dual-clock timing (K/K and C/C), DLL-enabled data placement accuracy, and 165-ball FBGA package compatibility with high-density PCB routing.

Technical Context

This device implements QDR-II architecture with fully independent synchronous read and write ports sharing a multiplexed address bus. Each port uses dedicated DDR interfaces: write data sampled on rising edges of K/K, read data driven on rising edges of C/C, with echo clocks CQ/CQ referenced to output clocks for precise capture timing.

The internal Delay Lock Loop (DLL) aligns output data to C/C edges within ±50 ps jitter, while variable-drive HSTL outputs support impedance-matched signaling at 1.4 VDDQ. Core logic operates at 1.8 V ±0.1 V, I/O at 1.4–1.8 V, and write operations are self-timed with synchronous port selects (WPS/RPS) and byte-level write enables (BWS0).

Key Specifications

Pinout & Package

165-ball Fine-Pitch Ball Grid Array (FBGA) package, 15 mm × 17 mm × 1.4 mm body, RoHS-compliant, with 0.8 mm ball pitch and bottom-side thermal pad (not electrically connected). Pinout optimized for differential clock routing (K/K, C/C), echo clock symmetry (CQ/CQ), and HSTL I/O termination via ZQ calibration.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-bandwidth dual-port SRAM applications.

Compared with IDT72T3615L10PA and IS61WV102418BLL-167BLI, CY7C1426AV18-167BZXC uniquely delivers full 36-Mbit depth with echo clocks, ZQ calibration, and BWS0 - essential for telecom systems requiring deterministic timing, long-term signal integrity, and partial-word updates.

Availability

CY7C1426AV18-167BZXC is available at Aetrix Electronics and suitable for network packet buffering, high-speed test equipment memory, baseband signal processing, and optical transport network framing requiring stable component supply across extended product lifecycles.

Supply support for CY7C1426AV18-167BZXC 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 communications, automotive, and industrial markets, with headquarters in San Jose, CA.

CY7C1426AV18 belongs to the QDR-II SRAM product line, engineered specifically for deterministic, low-latency, dual-port memory access in 10G/40G networking infrastructure and high-speed instrumentation.

FAQ

What is the function of the ZQ pin on CY7C1426AV18-167BZXC?

The ZQ pin calibrates output driver impedance for Q[8:0] and CQ/CQ signals. It must be connected to a 240 Ω resistor to ground to set output impedance to 50 Ω (0.2 × RQ), ensuring signal integrity on controlled-impedance PCB traces. Direct connection to VDDQ enables minimum drive strength; floating or grounding ZQ is prohibited and causes undefined behavior.

Can CY7C1426AV18-167BZXC operate with only a single clock (K) instead of differential K/K?

Yes - the device supports single-clock mode where K serves as both positive and negative input clock. In this mode, CQ is generated relative to K, and data is clocked using K for both input sampling and output driving. However, differential K/K is required to achieve full 167 MHz timing margins and minimize jitter-induced setup/hold violations in production systems.

How does the BWS0 signal affect write operations in CY7C1426AV18-167BZXC?

BWS0 is an active-low byte write select that gates the entire 9-bit D[8:0] bus. When asserted (LOW), D[8:0] is written to memory; when deasserted (HIGH), the write operation is ignored and memory contents remain unchanged. Unlike nibble-select variants, BWS0 provides full 9-bit granularity - no partial-byte masking within the 9-bit word is supported.

Is the DOFF pin required to be tied to a specific voltage in normal operation?

In normal operation, DOFF must be tied to VDDQ (1.4–1.8 V) to enable the internal Delay Lock Loop. Leaving DOFF floating or connecting it to ground disables the DLL, shifting output timing to a fixed-delay mode with degraded skew performance (>200 ps variation). For production use, DOFF is always VDDQ-connected unless DLL bypass is explicitly required for test diagnostics.