ics9ums9001 Integrated Device Technology, ics9ums9001 Datasheet - Page 13

• Manufacturer Part Number: ics9ums9001
• Description: Pc Main Clock - Ck540
• Manufacturer: Integrated Device Technology

IDT
Comments
Power-up w/ TEST_SEL = 1 to enter test mode
Cycle power to disable test mode
TEST_MODE -->low Vth input
TEST_MODE is a real time input
If TEST_SEL HW pin is 0 during power-up,
test mode can be invoked through B9b3.
If test mode is invoked by B9b3, only B9b4
is used to select HI-Z or REF/N
FSLB/TEST_Mode pin is not used.
Cycle power to disable test mode, one shot control
B9b3: 1= ENTER TEST MODE, Default = 0 (NORMAL OPERATION)
B9b4: 1= REF/N, Default = 0 (HI-Z)
Test Clarification Table
ICS9UMS9001
PC MAIN CLOCK - CK540
TM
/ICS
TM
PC MAIN CLOCK - CK540
TEST_SEL
HW PIN
<2.0V
>2.0V
>2.0V
>2.0V
>2.0V
<2.0V
<2.0V
13
HW
TEST_MODE
HW PIN
X
X
X
0
0
1
1
ENTRY BIT
TEST
B9b3
X
X
X
X
0
1
1
Advance Information
SW
REF/N or
B9b4
HI-Z
0
0
1
0
1
0
1
NORMAL
OUTPUT
REF/N
REF/N
REF/N
REF/N
HI-Z
HI-Z
1247A—08/28/08