Infineon Technologies CY7C4121KV13-667FCXC

Overview

CY7C4121KV13-667FCXC from Cypress Semiconductor is a 144-Mbit QDR™-IV HP SRAM configured as 8M × 18, operating at 667 MHz with 5.0-cycle read latency and 3.0-cycle write latency. It features dual independent DDR data ports (A/B), on-die termination, bus inversion, and on-chip ECC for soft error correction - deployed in high-throughput packet buffering and network switch fabric memory subsystems.

For engineers reviewing the CY7C4121KV13-667FCXC datasheet, CY7C4121KV13-667FCXC pinout, CY7C4121KV13-667FCXC application, or CY7C4121KV13-667FCXC equivalent, key selection criteria include concurrent port transaction capability, 1334 MT/s random transaction rate, HSTL/SSTL/POD I/O compatibility, and JTAG 1149.1 test access support for production validation.

Technical Context

This QDR-IV HP SRAM uses differential clocking (CK/CK#) to latch port A addresses on the rising edge and port B addresses on the falling edge, enabling time-multiplexed dual-port access via a single address bus. Control signals operate at SDR while both data ports run DDR with dedicated input (DKA/DKB) and output (QKA/QKB) clocks.

The device integrates per-bit deskew training, programmable ODT for CK/ADDR/DQ, ZQ-based output impedance calibration, and IEEE 1149.1 boundary scan with 1.3-V LVCMOS signaling. Its ECC circuitry achieves <0.01 FITs/Mb SER, targeting mission-critical telecom and military computing where radiation-induced errors must be mitigated.

Key Specifications

Pinout & Package

Package: 361-ball Fine-Pitch Chip Array Ball Grid Array (FCBGA), 21 mm × 21 mm, Pb-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-performance QDR SRAM applications.

Compared with IDT72T36120L10BG and AS7C3256A-15JCIN, CY7C4121KV13-667FCXC uniquely combines 1334 MT/s random throughput, dual-port DDR concurrency, and on-chip SEC-DED ECC - making it the sole option among the three for radiation-aware, full-duplex packet processing in 5G infrastructure.

Availability

CY7C4121KV13-667FCXC is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, high-performance test equipment, and military radar signal processing requiring stable component supply and long-term lifecycle support.

Supply support for CY7C4121KV13-667FCXC 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 demanding embedded and communications systems, with headquarters in San Jose, CA.

CY7C4121KV13 belongs to the QDR-IV HP SRAM product line, engineered specifically for ultra-low-latency, high-concurrency memory subsystems in networking, test instrumentation, and defense electronics where deterministic timing and data integrity are non-negotiable.

FAQ

What is the function of the ZQ pin on CY7C4121KV13-667FCXC?

The ZQ pin connects to an external 240 Ω ±1% precision resistor to ground and enables internal calibration of output driver impedance. This process matches the SRAM's DQ, CK, and ADDR output drive strength to the PCB trace impedance, ensuring signal integrity at 667 MHz DDR rates without requiring discrete termination resistors.

Does CY7C4121KV13-667FCXC support both HSTL and SSTL I/O standards?

Yes - the device supports HSTL Class I and SSTL_12 (JESD8-16A compliant) when VDDQ = 1.2 V ±50 mV or 1.25 V ±50 mV, and POD (JESD8-24 compliant) when VDDQ = 1.1 V ±50 mV. The I/O standard is selected via configuration registers during initialization, not by hardware strapping.

How does the address parity feature work on this SRAM?

The AP input accepts even parity across active address bits (A[21:0] for ×18 mode), and the PE# output asserts low if a parity mismatch is detected during address latching. PE# remains asserted until cleared by writing to the Configuration Register - enabling system-level fault logging and safe failover in telecom control planes.

Can CY7C4121KV13-667FCXC operate with only one data port enabled?

Yes - port A and port B are independently controllable via LDA#/LDB# and RWA#/RWB#. Disabling one port (e.g., holding LDB# HIGH) halts command registration for that port while allowing full operation on the other, supporting asymmetric traffic patterns in protocol-aware buffers without reconfiguration overhead.