Infineon Technologies CY7C1314KV18-250BZI

Overview

CY7C1314KV18 from Cypress Semiconductor is a 512K × 36-bit, 18-Mbit QDR® II SRAM with separate read/write ports, 250 MHz operation (4 ns cycle time), 1.8 V core supply, and 1.4–1.8 V I/O supply. It delivers 3.6 Gbps bandwidth via DDR interfaces on both ports, supports two-word burst transfers, and uses echo clocks (CQ/CQ) for high-speed data capture in networking and packet buffering applications.

For engineers reviewing the CY7C1314KV18 datasheet, CY7C1314KV18 pinout, CY7C1314KV18 application, or CY7C1314KV18 equivalent, key selection criteria include its 165-ball FBGA package, DOFF-configurable 1- or 1.5-cycle read latency, synchronous self-timed writes, JTAG 1149.1 test access, and HSTL-compatible variable-drive outputs.

Technical Context

The CY7C1314KV18 implements QDR II architecture with fully independent read and write ports sharing a single 18-bit address bus (A[17:0]), enabling concurrent transactions without bus turnaround. Address latching occurs on alternate rising edges of K/K clocks, and all synchronous inputs are registered to K or K.

Read data is output-synchronized to C/C clocks with echo clocks CQ/CQ referenced to those outputs; write data is sampled on K/K rising edges. The device includes a PLL for precise data placement, programmable output impedance via ZQ, and four byte-write selects (BWS[3:0]) for granular 9-bit write control across its 36-bit data width.

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 IDT72T3652 and IS61WV102436B, CY7C1314KV18 uniquely combines 250 MHz DDR operation, HSTL+ZQ impedance tuning, and CQ/CQ echo clocks - making it the only option supporting deterministic 3.6 Gbps line-rate packet buffering in 1.5 V/1.8 V systems.

Availability

CY7C1314KV18 is available at Aetrix Electronics and suitable for high-speed packet buffering, network switch fabric memory, telecom line card buffering, and baseband processing requiring stable component supply and long-term industrial availability.

Supply support for CY7C1314KV18 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 markets.

CY7C1314KV18 belongs to Cypress's QDR II SRAM product line, engineered specifically for deterministic, low-latency, concurrent-access memory subsystems in networking and telecom infrastructure equipment.

FAQ

What is the function of the DOFF pin on CY7C1314KV18?

The DOFF (Data Output OFF) pin configures read latency mode: when asserted HIGH, the device operates in QDR II mode with 1.5-cycle read latency; when LOW or tied to VSS, it reverts to QDR I mode with 1-cycle latency. This setting is sampled synchronously on the K clock and affects timing closure requirements for the memory controller.

Can CY7C1314KV18 operate with a single clock domain instead of differential clocks?

Yes - the device supports single-clock mode where K and K are tied together, and C and C are tied together. In this configuration, Q[35:0] and CQ/CQ are driven from the same clock source, simplifying board layout at the cost of reduced skew tolerance compared to differential C/C operation.

How does the ZQ pin affect signal integrity in high-speed designs?

The ZQ pin connects to an external resistor to ground (typically 240 Ω) to calibrate the output driver impedance of Q[35:0], CQ, and CQ to approximately 48 Ω (0.2 × RQ). This matching minimizes reflections and improves eye diagram margins on 50 Ω PCB traces operating at 500 MT/s.

Is CY7C1314KV18 pin-compatible with earlier QDR I devices like CY7C1314V18?

No - CY7C1314KV18 uses a 165-ball FBGA package with different pin assignments (e.g., dedicated C/C and CQ/CQ pins, ZQ, and expanded BWS signals), whereas CY7C1314V18 uses a 119-ball package and lacks echo clocks and impedance calibration. Board redesign is required for migration.