Product Summary

The KSZ8721B is a 2.5V 10/100BasTX/FX MII Physical Layer Transceiver. Operating at 2.5 volts to meet low voltage and low power requirements, the KSZ8721B is a 10BaseT/100BaseTX/FX Physical Layer Transceiver, which provides an MII to transmit and receive data. It contains the 10BaseT Physical Medium Attachment (PMA), Physical Medium Dependent (PMD), and Physical Coding Sub-layer (PCS) functions. Moreover, the KSZ8721B has on-chip 10BaseT output filtering, which eliminates the need for external filters and allows a single set of line magnetics to be used to meet requirements for both 100BaseTX and 10BaseT.

Parametrics

KSZ8721B absolute maximum ratings: (1)Supply Voltage: (VDDC, VDD_PLL, VDD_TX, VDD_RCV, VDD_RX): –0.5V to +3.0V, (VDDIO): –0.5V to +4.0V; (2)Input Voltage: –0.5V to +4.0V; (3)Output Voltage: –0.5V to +4.0V; (4)Lead Temperature (soldering, 10 sec.): 270℃; (5)Storage Temperature (TS): –55℃ to +150℃.

Features

KSZ8721B features: (1)Single chip 100BaseTX/100BaseFX/10BaseT physical layer solution; (2)2.5V CMOS design, power consumption <200mW (excluding output driver current ); (3)Fully compliant to IEEE 802.3u standard; (4)Supports Media Independent Interface (MII) and Reduced MII (RMII); (5)Supports 10BaseT, 100BaseTX and 100BaseFX with Far_End_Fault Detection; (6)Supports power down mode and power saving mode; (7)Configurable through MII serial management ports or via external control pins; (8)Supports auto-negotiation and manual selection for 10/100Mbps speed and full/half-duplex mode; (9)On-chip built-in analog front end filtering for both 100BaseTX and 10BaseT.

Diagrams

KSZ8721B functional diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
KSZ8721B
KSZ8721B

IC TXRX PHY 10/100 2.5V 48-SSOP
Data Sheet
0-1: $2.59
1-25: $2.07
25-100: $1.61
100-250: $1.53
250-500: $1.50
KSZ8721B TR
KSZ8721B TR

IC TXRX PHY 10/100 2.5V 48SSOP
Data Sheet
0-1: $2.59
1-25: $2.07
25-100: $1.61
100-250: $1.53
250-500: $1.50
KSZ8721BI
KSZ8721BI

IC TXRX PHY 10/100 2.5V 48SSOP
Data Sheet
0-1: $2.96
1-25: $2.37
25-100: $1.84
100-250: $1.75
250-500: $1.71
KSZ8721BA4 TR
KSZ8721BA4 TR

TXRX 10/100 3.3V 48-SSOP
Data Sheet
Negotiable 
KSZ8721BA4
KSZ8721BA4

TXRX 10/100 3.3V 48-SSOP
Data Sheet
Negotiable 
KSZ8721B-EVAL
KSZ8721B-EVAL

BOARD EVALUATION FOR KSZ8721B
Data Sheet
Negotiable 
KSZ8721BI TR
KSZ8721BI TR

TXRX PHY 10/100 2.3.3/5V 48-SSOP
Data Sheet
0-1000: $1.68
KSZ8721BL TR
KSZ8721BL TR

IC TXRX PHY 10/100 3.3V 48LQFP
Data Sheet
0-1: $2.77
1-25: $2.21
25-100: $1.72
100-250: $1.64
250-500: $1.60