
Micrel, Inc.
KSZ8841-PMQL
October 2007
10
M9999-100407-1.5
Pin
Number
Pin
Name
Type
Pin Function
Active Low signal to host CPU to request an interrupt when any one of the interrupt
conditions occurs in the registers. This pin should be pull-up externally.
17
NC
—
No connect
18
NC
—
No connect
19
EECS
Opu
EEPROM Chip Select
This signal is used to select an external EEPROM device
20
NC
—
No connect
21
NC
—
No connect
22
NC
—
No connect
23
DGND
Gnd
Digital Ground
24
VDDCO
P
1.2V Core Voltage Output. (Internal 1.2V LDO power supply output)
This pin provides 1.2V power supply to all 1.2V power pin, VDDC, VDDA, VDDAP. It is
recommended the pin should be connected to 3.3V power rail by a 100ohm resistor for
the internal LDO application.
25
NC
—
No connect
26
EEEN
Ipd
EEPROM Enable
EEPROM is enabled and connected when this pin is pull-up.
EEPROM is disabled when this pin is pull-down or no connect.
27
P1LED3
Opd
Port 1 LED Indicator
See the description in pins 3, 4, and 5.
28
EEDO
Opd
EEPROM Data Out
This pin is connected to DI input of the serial EEPROM.
29
EESK
Opd
EEPROM Serial Clock
4
s serial clock to load configuration data from the serial EEPROM.
30
EEDI
Ipd
EEPROM Data In
This pin is connected to DO output of the serial EEPROM.
31
NC
—
No connect
32
VDDIO
P
3.3V digital I/O VDD.
33
VDDIO
P
3.3V digital I/O VDD.
34
DGND
Gnd
Digital ground
35
DGND
Gnd
Digital ground
36
PWRDN
Ipu
Full-chip power-down input. Active Low.
37
AGND
Gnd
Analog ground
38
VDDA
P
1.2V analog VDD
39
AGND
Gnd
Analog ground
40
NC
—
No connect
41
NC
—
No connect
42
AGND
Gnd
Analog ground
43
VDDA
P
1.2V analog VDD
44
NC
—
No connect