Cypress Semiconductor Corp CY7C1245KV18-400BZC

Overview

CY7C1245KV18 from Cypress Semiconductor is a 1M × 36, 36-Mbit QDR® II+ SRAM with 2.0-cycle read latency, 400 MHz clock operation (800 Mbps DDR per port), 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 signaling - deployed in high-speed packet buffering for network line cards and telecom switching fabric.

For engineers reviewing the CY7C1245KV18 datasheet, CY7C1245KV18 pinout, CY7C1245KV18 application, or CY7C1245KV18 equivalent, key selection criteria include its 400 MHz synchronous timing, dual DDR interfaces, DOFF-configurable latency mode (QDR I vs. QDR II+), HSTL I/O compatibility, and 165-ball FBGA package footprint.

Technical Context

The CY7C1245KV18 implements a true dual-port architecture with physically independent read and write data paths - eliminating bus turnaround overhead. Its 2.0-cycle read latency is enforced when DOFF is HIGH, while asserting DOFF LOW reverts it to QDR I mode (1-cycle latency, ≤167 MHz). All address and control inputs are registered on K/K rising edges.

It uses an internal PLL for precise data placement and includes echo clocks (CQ/CQ) aligned to K/K for simplified high-speed capture. The device supports byte-write masking via BWS[3:0], depth expansion via RPS/WPS, and impedance tuning via ZQ pin tied to external resistor or VDDQ.

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 high-bandwidth burst SRAM applications.

Compared with IDT72T36120L10BG and IS61WV102436B, the CY7C1245KV18 uniquely supports 1.4 V I/O operation, configurable latency via DOFF, and integrated echo clocks - making it optimal for next-generation telecom and defense systems demanding flexible timing and robust high-speed signaling.

Availability

CY7C1245KV18 is available at Aetrix Electronics and suitable for network packet buffering, telecom switch fabric, high-speed test equipment, and defense radar signal processing requiring stable component supply and long-term obsolescence management.

Supply support for CY7C1245KV18 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 solutions for industrial, automotive, and communications markets.

The CY7C1245KV18 belongs to Cypress's QDR® II+ SRAM product line, engineered specifically for deterministic, low-latency, concurrent-access memory in high-speed networking and signal processing systems.

FAQ

What is the function of the DOFF pin on CY7C1245KV18?

The DOFF (PLL Disable) pin is an active-LOW input that disables the internal PLL. When pulled LOW, the device operates in QDR I mode with 1-cycle read latency and maximum clock frequency of 167 MHz. When HIGH (via pull-up), it enables QDR II+ mode with 2-cycle latency and up to 400 MHz operation. This provides hardware-selectable timing flexibility for system-level optimization.

How does the ZQ pin affect output driver performance?

The ZQ pin connects to an external resistor to ground to calibrate output driver impedance. It sets CQ, CQ, and Q[35:0] output impedance to 0.2 × RQ, matching typical 50 Ω transmission lines. If tied directly to VDDQ, it enables minimum impedance mode (≈25 Ω). ZQ must never be left floating or tied to GND, as this disables calibration and risks signal integrity failure.

Can CY7C1245KV18 perform simultaneous read and write operations?

Yes - the CY7C1245KV18 has fully independent read and write ports with separate data buses, clocks, and control signals (RPS/WPS). A read burst on Q[35:0] and a write burst on D[35:0] can occur concurrently on the same clock cycle, delivering true 1.6 GB/s aggregate bandwidth (800 MT/s per port) without arbitration or bus turnaround delays.

What is the role of QVLD in system timing design?

QVLD is a synchronous output that pulses high for one K/K cycle precisely when valid data appears on Q[35:0]. It is edge-aligned with CQ/CQ, enabling reliable source-synchronous capture in FPGA or ASIC receivers. Unlike asynchronous ready signals, QVLD eliminates setup/hold uncertainty and simplifies timing closure in 400 MHz DDR interfaces.