Selection Pin for 1X and 2X Output Frequency Options. Please refer to the table
Frequency Selection Options
for further details.
Crystal connection. If using an external reference, this pin must be left unconnected.
Crystal connection or external reference frequency input. This pin has dual functions. It
can be connected either to an external crystal or an external reference clock.
Power supply for the entire chip.
Spread spectrum clock output.
Ground connection.
Modulation Profile
Specifications
Description
Frequency Range
Modulation Equation
Frequency Deviation
FSEL=0
FSEL=1
Specification
13MHz < CLKIN < 30MHz
F
IN
/640
-1.5% (Typ) @ 50MHz
-1.5% (Typ) @ 25MHz
Frequency Selection Options
FSEL Pin
0
Input Frequency (MHz)
13-30
Output Frequency (MHz)
26-60
1
13-30
13-30
Rev. 2 | Page 2 of 7 | www.onsemi.com
ASM3P2474A
Absolute Maximum Ratings
Symbol
VDD, V
IN
T
STG
T
s
T
J
T
DV
Storage temperature
Max. Soldering Temperature (10 sec)
Junction Temperature
Static Discharge Voltage
(As per JEDEC STD22- A114-B)
Parameter
Voltage on any pin with respect to Ground
Rating
-0.5 to +4.6
-65 to +125
260
150
2
Unit
V
°
C
°
C
°
C
KV
Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect
device reliability.
Operating Conditions
Parameter
VDD
T
A
C
L
C
IN
Supply Voltage
Operating Temperature (Ambient Temperature)
Load Capacitance
Input Capacitance
Description
Min
3
0
Max
3.6
70
15
7
Unit
V
°
C
pF
pF
DC Electrical Characteristics
Symbol
V
IL
V
IH
I
IL
I
IH
I
XOL
I
XOH
V
OL
V
OH
I
DD
I
CC
VDD
t
ON
Z
OUT
Input low voltage
Input high voltage
Input low current
Input high current
XOUT output low current (@ 0.4V, VDD = 3.3V)
XOUT output high current (@ 2.5V, VDD = 3.3V)
Output low voltage (VDD = 3.3V, I
OL
= 8mA)
Output high voltage (VDD = 3.3V, I
OH
= 8mA)
Static supply current
Dynamic supply current
(3.3V, 25MHz and no load and FSEL=1)
Operating voltage
Power-up time (first locked cycle after power-up)
Output impedance
45
1
Parameter
Min
VSS-0.3
2.0
Typ
Max
0.8
VDD+0.3
-35
35
Unit
V
V
µA
µA
mA
mA
3
3
0.4
2.5
1.6
4.0
3.0
3.3
3.6
5
V
V
mA
mA
V
mS
Note: 1. XIN /CLKIN pin is pulled low.
Rev. 2 | Page 3 of 7 | www.onsemi.com
ASM3P2474A
AC Electrical Characteristics
Symbol
CLKIN
ModOUT
f
d
f
d
t
LH
t
HL
1
1
Parameter
Input frequency
Output frequency
Frequency Deviation
Frequency Deviation
FSEL = 0
FSEL = 1
Output Frequency = 13MHz
Output Frequency = 30MHz
Output Frequency = 26MHz
Output Frequency = 60MHz
Min
13
26
13
Typ
Max
30
60
30
Unit
MHz
MHz
%
%
-1.8
-0.9
-1.8
-0.9
0.4
0.3
45
0.85
0.7
±200
50
55
1.1
0.9
Output rise time (measured from 0.8 to 2.0V)
Output fall time (measured at 2.0V to 0.8V)
Jitter (cycle-to-cycle)
Output duty cycle
nS
nS
pS
%
t
JC
t
D
Note: 1. t
LH
and t
HL
are measured into a capacitive load of 15pF.
Typical Crystal Specifications
Fundamental AT cut parallel resonant crystal
Nominal frequency
Frequency tolerance
Operating temperature range
Storage temperature
Load capacitance(C
P
)
Shunt capacitance
ESR
25MHz
± 30 ppm or better at 25°
C
-25° to +85°
C
C
-40° to +85°
C
C
18pF
7pF maximum
25
Ω
Note: Note: C
L
is Load Capacitance and Rx is used to prevent oscillations at overtone frequency of the Fundamental frequency.
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