Infineon Technologies CY7C1170KV18-400BZC

Overview

CY7C1170KV18 from Cypress Semiconductor is a 18-Mbit synchronous pipelined DDR II+ SRAM configured as 512K × 36, operating at up to 400 MHz (2.5-cycle read latency), with 1.8 V core supply and 1.4–1.8 V I/O supply, HSTL-compatible interfaces, and integrated PLL for precise data placement - deployed in high-bandwidth networking line cards and packet buffering subsystems.

For engineers reviewing the CY7C1170KV18 datasheet, CY7C1170KV18 pinout, CY7C1170KV18 application, or CY7C1170KV18 equivalent, key selection criteria include confirmed 2.5-cycle DDR II+ read latency mode, echo clock (CQ/CQ) timing alignment, QVLD validity signaling, DOFF-controlled PLL enable/disable behavior, and 165-ball FBGA (13 × 15 × 1.4 mm) package compatibility with depth-expansion memory architectures.

Technical Context

The CY7C1170KV18 implements a two-word burst DDR II+ architecture where each read/write access transfers 36-bit data on alternating rising edges of complementary K/K clocks. Address latching occurs on K only; write data is registered on both K and K edges; read data is driven synchronously on both clock edges with echo clocks CQ/CQ edge-aligned to output timing.

It integrates a phase-locked loop (PLL) for accurate internal clock synthesis and data placement, supports programmable output impedance via ZQ calibration, and provides QVLD to indicate valid output data aligned with CQ/CQ. The DOFF pin enables switching between DDR II+ (2.5-cycle latency, up to 400 MHz) and DDR I (1-cycle latency, ≤167 MHz) operation modes.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body height, RoHS-compliant, 0.8 mm ball pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed burst SRAM applications.

Compared with IDT72T3652 and IS61WV102436B, the CY7C1170KV18 delivers 40% higher bandwidth at 400 MHz with built-in timing aids (CQ/CQ, QVLD, ZQ), reducing FPGA logic utilization and PCB routing complexity in high-speed packet processing designs.

Availability

CY7C1170KV18 is available at Aetrix Electronics and suitable for packet buffering, network processor interfacing, depth-expanded memory arrays, and real-time signal processing requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for CY7C1170KV18 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) is a fabless semiconductor company specializing in high-performance memory, microcontrollers, and programmable logic solutions for industrial, automotive, and communications markets.

The CY7C1170KV18 belongs to Cypress's DDR II+ SRAM product line, engineered specifically for deterministic, low-latency, high-throughput buffering in packet-switched infrastructure where echo-clock synchronization and programmable impedance eliminate system-level timing closure challenges.

FAQ

What is the function of the DOFF pin on CY7C1170KV18?

The DOFF pin is an active-low PLL disable control. When pulled HIGH, the internal PLL is enabled, allowing DDR II+ operation at up to 400 MHz with 2.5-cycle read latency. When pulled LOW, the PLL is disabled and the device operates in DDR I mode with 1-cycle latency and maximum frequency reduced to 167 MHz. This dual-mode capability supports backward compatibility and flexible system timing design.

How does the ZQ pin affect output drive strength?

The ZQ pin connects to an external precision resistor (typically 50 Ω) to ground, enabling on-die calibration of CQ, CQ, and DQ[35:0] output driver impedance. The calibrated value equals 0.2 × RQ, resulting in 10 Ω nominal output resistance - matching standard 50 Ω transmission lines when terminated. This eliminates need for external series resistors and maintains signal integrity across voltage and temperature variations.

Can CY7C1170KV18 be used without the PLL in systems requiring strict jitter control?

Yes - asserting DOFF LOW disables the PLL and reverts the device to DDR I timing, where all operations are referenced directly to the external K/K clocks without internal multiplication. This reduces jitter contribution from PLL circuitry and is appropriate for systems where absolute clock fidelity outweighs bandwidth requirements, though maximum frequency drops to 167 MHz.

What is the role of QVLD in system-level data capture?

QVLD is a synchronous output signal edge-aligned with CQ and CQ that asserts HIGH only when DQ[35:0] carries valid read data. It replaces the need for fixed delay-based sampling windows or complex deskew logic in FPGA receivers, enabling robust, process-voltage-temperature-independent data capture using simple register-based latching on the rising edge of QVLD.