Infineon Technologies CY7C1245KV18-400BZXC

Overview

CY7C1245KV18-400BZXC from Cypress Semiconductor is a 1M × 36, 36-Mbit QDR® II+ SRAM with 2.0-cycle read latency, 400 MHz clock operation (800 MT/s DDR), 1.8 V core supply, and 1.4–1.8 V I/O supply. It features separate read/write ports, four-word burst transfers, echo clocks (CQ/CQ), and QVLD data-valid indicator - deployed in high-speed network packet buffers and FPGA co-processor memory interfaces.

For engineers reviewing the CY7C1245KV18-400BZXC datasheet, CY7C1245KV18-400BZXC pinout, CY7C1245KV18-400BZXC application, or CY7C1245KV18-400BZXC equivalent, key selection criteria include 400 MHz sustained DDR bandwidth, HSTL-compatible 165-ball FBGA package, DOFF-configurable QDR I/II+ mode, and JTAG 1149.1 test access for production validation.

Technical Context

This device implements a synchronous pipelined QDR II+ architecture with independent read and write ports sharing a multiplexed 18-bit address bus. All inputs are registered on rising edges of K/K clocks; outputs are edge-aligned to CQ/CQ echo clocks and qualified by QVLD.

The internal PLL enables precise 2.0-cycle read latency when DOFF = HIGH; disabling the PLL via DOFF = LOW reverts operation to QDR I timing (1-cycle latency, ≤167 MHz). Depth expansion uses RPS/WPS and BWS[3:0] signals, supporting 36-bit-wide burst writes with byte-select granularity.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C362000B-400BIN and IS45S32800J-400BLI, CY7C1245KV18-400BZXC uniquely combines 36-bit width, DOFF-switchable latency modes, integrated ZQ calibration, and JTAG testability - making it optimal for new high-reliability telecom and test equipment designs requiring design margin and production test coverage.

Availability

CY7C1245KV18-400BZXC is available at Aetrix Electronics and suitable for network packet buffering, FPGA co-processor memory, and telecom baseband processing requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for CY7C1245KV18-400BZXC 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 networking, automotive, and industrial applications, with emphasis on signal integrity and system-level timing robustness.

CY7C1245KV18 belongs to the QDR® II+ SRAM product line, engineered specifically for full-duplex, burst-oriented memory subsystems in packet-processing and FPGA-accelerated systems demanding deterministic latency and DDR bandwidth.

FAQ

What is the function of the DOFF pin on CY7C1245KV18-400BZXC?

The DOFF pin controls the internal PLL: when pulled HIGH, the device operates in QDR II+ mode with 2.0-cycle read latency at up to 400 MHz; when pulled LOW, the PLL is disabled and the device reverts to QDR I timing with 1-cycle latency and maximum 167 MHz operation. This allows backward compatibility and flexible timing trade-offs without changing hardware layout.

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 pins to ~50 Ω. This matches standard PCB trace impedances, minimizing reflections and ensuring clean eye diagrams at 800 MT/s - eliminating need for external series termination resistors.

Can CY7C1245KV18-400BZXC perform simultaneous read and write operations to the same address?

Yes - the QDR II+ architecture supports fully independent read and write ports. Concurrent access to the same address is permitted and results in coherent behavior: the most recently written data becomes immediately available on the next read cycle, guaranteed by the synchronous self-timed write circuitry and full data coherency design.

What is the role of QVLD in system timing validation?

QVLD is a synchronous output that pulses high exactly when Q[35:0] data is valid and stable relative to CQ/CQ edges. Unlike relying on clock-to-output timing specs alone, QVLD provides a deterministic, pin-level assertion of data readiness - enabling robust FPGA capture logic without margin-intensive static timing analysis or complex dynamic calibration.