When SSON is HIGH, the spread spectrum is enabled and when LOW, it turns off the
spread spectrum. Connect the pin to ground when Spread Spectrum feature is not
required.
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.
Rev. 2 | Page 2 of 12 | www.onsemi.com
ASM3P2579A
Pin Configuration (8-pin SOIC and TSSOP Packages)
XIN / CLKIN
1
XOUT
2
8
7
VDD
NC
ModOUT
VSS
ASM3P2579A
6
5
SSON
3
NC
4
Pin Description
Pin#
1
2
3
4
5
6
7
8
Pin Name
XIN / CLKIN
XOUT
Type
I
O
I
-
P
O
-
P
Description
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.
Crystal connection. If using an external reference, this pin must be left unconnected.
When SSON is HIGH, the spread spectrum is enabled and when LOW, it turns off the
spread spectrum. Connect the pin to ground When Spread Spectrum feature is not
required.
No connect.
Ground connection.
Spread spectrum clock output.
No connect.
Power supply for the entire chip.
SSON
NC
VSS
ModOUT
NC
VDD
Modulation Profile
Specifications
Description
Frequency Range
Modulation Equation
Frequency Deviation
Specification
12MHz < CLKIN < 30MHz
F
IN
/640
±1% @ 24MHz
Rev. 2 | Page 3 of 12 | www.onsemi.com
ASM3P2579A
Absolute Maximum Ratings
Symbol
VDD, V
IN
T
STG
T
A
T
s
T
J
T
DV
Storage temperature
Operating temperature
Max. Soldering Temperature (10 sec)
Junction Temperature
Static Discharge Voltage
(As per JEDEC STD22- A114-B)
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.
Parameter
Rating
-0.5 to +4.6
-65 to +125
-40 to +85
260
150
2
Unit
V
°C
°C
°C
°C
KV
Voltage on any pin with respect to Ground
DC Electrical Characteristics for 2.5V Supply
(Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated.)
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
Parameter
Min
VSS-0.3
2.0
-
-
-
-
-
1.8
-
-
2.375
-
-
Typ
-
-
-
-
3
3
-
-
1.1
3.5
2.5
-
50
Max
0.8
VDD+0.3
-35
35
-
-
0.6
-
-
-
2.625
5
-
Unit
V
V
µA
µA
mA
mA
V
V
mA
mA
V
mS
Ω
XOUT output low current (@ 0.5V, VDD = 2.5V)
XOUT output high current (@ 1.8V, VDD = 2.5V)
Output low voltage (VDD = 2.5V, I
OL
= 8mA)
Output high voltage (VDD = 2.5V, I
OH
= 8mA)
Static supply current
Operating Voltage
Power-up time (first locked cycle after power-up)
Output impedance
1
Dynamic supply current (2.5V, 24MHz and no load)
Note: 1. XIN / CLKIN is made low.
AC Electrical Characteristics for 2.5V Supply
Symbol
CLKIN
ModOUT
f
d
t
LH
t
HL
1
1
Parameter
Input frequency
Output frequency
Input Frequency = 12MHz
Frequency Deviation
Input Frequency = 30MHz
Output rise time (measured from 0.7V to 1.7V)
Output fall time (measured from 1.7V to 0.7V)
Jitter (cycle-to-cycle)
Output duty cycle
Min
12
12
-
-
0.7
0.4
-
45
Typ
-
-
±1.65
±0.80
1.5
1.0
-
50
Max
30
30
-
Unit
MHz
MHz
%
-
1.9
1.1
200
55
nS
nS
pS
%
t
JC
t
D
Note: 1. t
LH
and t
HL
are measured into a capacitive load of 15pF.
Rev. 2 | Page 4 of 12 | www.onsemi.com
ASM3P2579A
DC Electrical Characteristics for 3.3V Supply
(Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated.)
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