KSZ8721SL Micrel Inc, KSZ8721SL Datasheet - Page 8

• Manufacturer Part Number: KSZ8721SL
• Description: IC TXRX PHY 10/100 3.3V 48-SSOP
• Manufacturer: Micrel Inc
• Type: Transceiverr

Specifications of KSZ8721SL

• Number Of Drivers/receivers: 1/1
• Protocol: IEEE 802
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 48-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1630 - BOARD EVALUATION FOR KSZ8721SL
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 576-1031-5; 576-1512-5; 576-1512-5; KSZ8721SL

Micrel, Inc.
June 2009
Pin Number
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
Pin Name
NWAYEN
VDDRCV
PHYAD0
SPD100/
VDDRX
VDDTX
VDDIO
FXSD/
LED0/
LED1/
LED3/
TEST
FXEN
REXT
INT#/
nFEF
LED2
GND
GND
GND
GND
PD#
RX+
TX+
RX-
TX-
Type
Ipu/O
Ipu/O
Ipu/O
Ipu/O
Ipu/O
Ipd/O
Gnd
Gnd
Gnd
Gnd
Ipu
O
O
P
P
P
P
I
I
I
(1)
Pin Function
See “Circuit Design Ref. for Power Supply” section for details.
Management Interface (MII) Interrupt Out. Interrupt level set by Register 1f, bit 9.
During reset, latched as PHYAD[0]. See “Strapping Options” section for details.
Link/Activity LED Output. The external pull-down enable test mode and only used for
the factory test. Active low.
Speed LED Output. Latched as SPEED (Register 0, bit 13) during power-up/ reset. See
“Strapping Options” section for details. Active low.
Full-duplex LED Output. Latched as DUPLEX (register 0h, bit 8) during power-up/ reset.
See “Strapping DUPLEX Options” section for details. Active low.
Collision LED Output. Latched as ANEG_EN (register 0h, bit 12) during power-up/
reset. See “Strapping Options” section for details.
details.
Receive Input. Differential receive input pins for 100FX, 100BASE-TX, or 10BASE-T.
Receive Input: Differential receive input pin for 100FX, 100BASE-TX, or 10BASE-T.
Fiber Mode Enable / Signal Detect in Fiber Mode. If FXEN = 0, FX mode is disable. The
default is “0”. See “100BT FX Mode” section for more details.
Ground.
Ground.
Analog 2.5V power supply. 2.5V power output of voltage regulator. See “Circuit Design
Ref. for Power Supply” section for details.
Ground.
Transmit Outputs: Differential transmit output for 100FX, 100BASE-TX, or 10BASE-T.
Transmit Outputs: Differential transmit output for 100FX, 100BASE-TX, or 10BASE-T.
Transmitter 2.5V power supply. See “Circuit Design Ref. for Power Supply” section for
details.
Ground.
Digital IO 2.5/3.3V tolerant power supply. 3.3V power input of voltage regulator.
Power Down. 1 = Normal operation, 0 = Power-down. Active low.
Analog 2.5V power supply. See “Circuit Design Ref. for Power Supply” section for
External resistor (6.49kW ) connects to REXT and GND.
Link/Act
No Link
Link
Act
Speed
10BT
100BT
Duplex
Half
Full
Collision
No Collision
Collision
Pin State
H
L
–
Pin State
H
L
Pin State
H
L
Pin State
H
L
8
LED Definition PHYAD0
“Off”
“On”
“Toggle”
LED Definition
“Off”
“On”
LED Definition
“Off”
“On”
LED Definition
“Off”
“On”
M9999-062509-1.3
KS8721BL/SL