Infineon Technologies CY7C1312KV18-300BZXI

Overview

CY7C1312KV18 from Cypress Semiconductor is a 1M × 18, 18-Mbit QDR® II SRAM with separate read/write ports, 333 MHz clock operation (666 MHz DDR data rate), 1.5-cycle read latency (DOFF = HIGH), and 1.8 V core / 1.4–1.8 V I/O supply. It delivers concurrent burst transfers of two 18-bit words per access for high-bandwidth networking buffer applications.

For engineers reviewing the CY7C1312KV18 datasheet, CY7C1312KV18 pinout, CY7C1312KV18 application, or CY7C1312KV18 equivalent, key selection criteria include dual-clock DDR timing support, echo clock (CQ/CQ) synchronization for high-speed capture, JTAG 1149.1 testability, and FBGA-165 package compatibility with depth expansion via RPS/WPS.

Technical Context

The CY7C1312KV18 implements a synchronous pipelined QDR II architecture with physically independent read and write data paths-eliminating bus turnaround overhead. It uses K/K clocks for address/data input latching and C/C clocks for output timing, with echo clocks CQ/CQ aligned to C/C for skew-compensated data capture.

It supports two-word burst transfers on every access, with configurable read latency (1 cycle in QDR I mode when DOFF = LOW; 1.5 cycles in native QDR II mode when DOFF = HIGH). Internal self-timed writes and programmable output impedance (via ZQ pin) enable robust signal integrity at 333 MHz.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm, RoHS-compliant, with 0.8 mm ball pitch and bottom-side thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T36120L5 and IS61WV102418B, CY7C1312KV18 uniquely delivers 666 MT/s DDR bandwidth with echo-clock–assisted capture and QDR II's concurrent read/write capability - essential for modern packet-processing architectures where bus efficiency and timing determinism are non-negotiable.

Availability

CY7C1312KV18 is available at Aetrix Electronics and suitable for high-speed network packet buffering, telecom line card data buffers, and baseband processing applications requiring stable component supply, long-term lifecycle support, and guaranteed FBGA-165 sourcing.

Supply support for CY7C1312KV18 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 systems, with emphasis on signal integrity and timing precision.

The QDR® II SRAM product line targets high-bandwidth, low-latency buffering in networking and telecom infrastructure - specifically engineered to replace asynchronous SRAMs and simplify DDR controller design through deterministic burst and echo-clock interfaces.

FAQ

What is the function of the DOFF pin on CY7C1312KV18?

The DOFF (Data Output OFFset) pin configures read latency mode: when asserted HIGH, it enables native QDR II operation with 1.5-cycle read latency; when LOW (or tied to VSS), it reverts to QDR I mode with 1-cycle latency. This provides backward compatibility while preserving timing margin for pipeline-critical designs.

Can CY7C1312KV18 operate with only one clock domain (K only)?

Yes - in single-clock mode, K serves as both input and output clock; C/C are unused, and Q[17:0] are driven on K/K edges. However, echo clocks CQ/CQ remain inactive, and deskew benefits are lost. This mode simplifies clock routing but sacrifices timing margin at maximum frequency.

How is output impedance calibrated using the ZQ pin?

ZQ connects to an external resistor (RQ) to ground; internal circuitry sets Q[17:0] and CQ/CQ driver impedance to 0.2 × RQ. Typical RQ = 240 Ω yields 48 Ω output impedance. Direct connection to VDDQ enables minimum impedance (~24 Ω); ZQ must never be left floating or tied to GND.

Is JTAG boundary scan supported during normal operation?

Yes - JTAG 1149.1 functionality operates independently of memory operation. TAP signals (TCK, TMS, TDI, TDO) are sampled asynchronously and do not interfere with K/K or C/C timing. Boundary scan can be performed in-system without halting data traffic or resetting the device.