KSZ8721CL TR Micrel Inc, KSZ8721CL TR Datasheet - Page 7

• Manufacturer Part Number: KSZ8721CL TR
• Description: TXRX 10/100 3.3V 48-LQFP
• Manufacturer: Micrel Inc
• Type: Transceiverr

Specifications of KSZ8721CL TR

• Number Of Drivers/receivers: 1/1
• Protocol: MII
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: KSZ8721CLTR; KSZ8721CLTR

April 2005
Notes:
1. P = Power supply.
KS8721CL
Pin Number
GND = Ground.
I = Input.
I/O = Bidirectional.
Ipd = Input w/ internal pull-down.
Ipd/O = Input w/ internal pull-down during reset, output pin otherwise.
Ipu = Input w/ internal pull-up.
Ipu/O = Input w/ internal pull-up during reset, output pin otherwise.
O = Output.
19
20
21
22
23
24
25
26
27
28
29
30
LED0/TEST
Pin Name
RMII_BTB
COL/RMII
NWAYEN
PHYAD0
PHYAD0
SPD100/
VDDIO
LED1/
LED2/
LED3/
TXD2
TXD3
CRS/
INT#/
nFEF
GND
PD#
Type
Ipd/O
Ipd/O
Ipu/O
Ipu/O
Ipu/O
Ipu/O
Ipu/O
GND
Ipd
Ipd
Ipu
P
(1)
Pin Function
MII Transmit Data Input.
MII Transmit Data Input.
MII Collision Detect Output.
During reset, the pull-up/pull-down value is latched as RMII select. See “Strapping
Options” section for details.
MII Carrier Sense Output.
During reset, the pull-up/pull-down value is latched as RMII back-to-back mode
when RMII mode is selected. See “Strapping Options” section for details.
Ground.
Digital IO 2.5/3.3V tolerant power supply. 3.3V power input of voltage regulator.
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 LED Output. The external pull-down enable test mode and only used
for the factory test. Active low.
Link
No Link
Link
Speed LED Output. Latched as SPEED (Register 0, bit 13) during power-up/
reset. See “Strapping Options” section for details. Active low.
Speed
10BT
100BT
Full-duplex LED Output. Latched as DUPLEX (register 0h, bit 8) during power-up/
reset. See “Strapping DUPLEX Options” section for details. Active low.
Duplex
Half
Full
LED Output. Latched as ANEG_EN (register 0h, bit 12) during power-up/
reset. See “Strapping Options” section for details.
Activity
Activity
Power Down. 1 = Normal operation, 0 = Power-down. Active low.
Pin State
H
L
Pin State
H
L
Pin State
H
L
Pin State
–
7
LED Definition
“Off”
“On”
LED Definition
“Off”
“On”
LED Definition
“Off”
“On”
LED Definition
“Toggle”
M9999-041405
Micrel, Inc.