14 / 48 page
IP1001 LF
Data Sheet
14/48
Dec. 18, 2007
Copyright © 2006, IC Plus Corp.
IP1001-DS-R06
Pin description (continued)
Pin no.
Label
Type
Description
Miscellaneous
33
X1
I
Reference Clock.
25 MHz crystal reference or oscillator input.
Connects to crystal to provide the 25MHz crystal input. If a
25MHz oscillator is used, connect X1 to the oscillator’s output.
The input voltage of this pin should not exceed 1.8V. A voltage
divider formed by 2 resistors is recommended if the output
voltage of oscillator is over 1.8V. Please refer to the Crystal
Specifications in detail.
34
X2
O
Reference Clock.
25 MHz crystal reference.
35
RESET#
I
Hardware reset
Active low.
IP1001 enters reset state when this pin is pulled low.
37
NC_TEST
IPL
It is used for scan test only. It should be left open for normal
operation.
10
CLK_OUT
O
125M clock output
It is used by external MAC device. This signal is always active
after reset.
25
CAP
Capacitor pin
It should be connected to GND through an external 10uF
capacitor. It is used to stabilize the internal analog power.
17
R_SET
I
Band gap Reference
Add an external 6.19k
Ω±1% resistor between this pin and
GND. IP1001 utilizes this resistor to set the current source.
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