Infineon Technologies CY7C1315CV18-167BZC

Overview

CY7C1315CV18 from Cypress Semiconductor is a 18-Mbit QDR-II SRAM with 512K × 36 organization, designed for high-bandwidth packet buffering in network switches and routers. It supports concurrent read/write operations at 167 MHz (334 MT/s), delivers 4-word burst transfers per access, uses separate DDR read/write ports with echo clocks (CQ/CQ), and operates with 1.8 V core supply and 1.4–1.8 V I/O supply.

For engineers reviewing the CY7C1315CV18 datasheet, CY7C1315CV18 pinout, CY7C1315CV18 application, or CY7C1315CV18 equivalent, key selection criteria include QDR-II burst timing, 165-ball FBGA package compatibility, DLL-enabled 1.5-cycle read latency, HSTL-18 I/O compliance, and depth-expansion support via BWS[3:0] and port-select signals.

Technical Context

This device implements true dual-port synchronous pipelined architecture: independent K/K clocks latch write addresses and data, while C/C clocks drive read outputs with echo clocks CQ/CQ aligned to output timing. The Delay Lock Loop (DLL) enables precise 1.5-cycle read latency at full speed; disabling DLL via DOFF pin reverts operation to QDR-I mode with 1-cycle latency at ≤167 MHz.

All inputs are registered on rising edges of K or K; all outputs pass through registers clocked by C or C. Address bus is fully multiplexed-17 address lines (A[16:0]) serve both ports-and byte write select (BWS[3:0]) allows granular 9-bit byte-level writes across the 36-bit data path without disturbing unselected bytes.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1315CV18-200BZC, this -167BZC variant trades peak bandwidth for relaxed voltage and jitter requirements; versus AS7C331024B-167BIN, it delivers true concurrent read/write capability and deterministic burst timing essential for packet-processing pipelines.

Availability

CY7C1315CV18 is available at Aetrix Electronics and suitable for network infrastructure, high-speed test instrumentation, telecom baseband subsystems, and medical imaging hardware requiring stable component supply over extended production lifecycles.

Supply support for CY7C1315CV18 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, industrial, and automotive systems.

CY7C1315CV18 belongs to the QDR-II SRAM product line, engineered specifically for deterministic, low-latency, concurrent-access buffering in packet-switched and real-time signal processing architectures.

FAQ

What is the function of the DOFF pin on CY7C1315CV18?

The DOFF pin disables the internal Delay Lock Loop when pulled LOW. In this state, the device operates in QDR-I mode with 1-cycle read latency and reduced maximum frequency (≤167 MHz). This mode simplifies timing closure in systems where DLL calibration adds complexity or risk, and is commonly used during bring-up or safety-critical validation phases.

How does the BWS[3:0] signal enable partial writes in CY7C1315CV18?

BWS[3:0] are four active-low byte write select signals that independently gate 9-bit segments of the 36-bit D[35:0] bus. When a BWS bit is HIGH, its corresponding 9-bit byte is masked and unchanged during the write cycle; only bytes with LOW BWS are updated. This allows atomic modification of packet headers or metadata without reading-modify-write sequences.

Can CY7C1315CV18 operate with only a single clock domain (K-only)?

Yes - the device supports single-clock-mode operation where K serves as both input and output clock. In this mode, C and C are tied to K and K respectively, and Q[35:0] is clocked by K/K instead of C/C. Echo clocks CQ/CQ remain functional and phase-aligned to K/K, preserving source-synchronous capture capability without requiring separate C/C routing.

What is the purpose of the ZQ pin and how should it be terminated?

ZQ calibrates output driver impedance for Q[35:0] and CQ/CQ signals. It must be connected to a precision resistor (RQ) between ZQ and GND; typical RQ = 240 Ω yields 48 Ω output impedance (0.2 × RQ). Direct connection to VDDQ enables minimum-impedance mode (~24 Ω); floating or GND ties are prohibited and will cause undefined output behavior.