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 (3.3V).
Spread spectrum clock output.
Ground connection.
Pin Configuration (8-pin SOIC and TSSOP Packages)
XIN / CLKIN
XOUT
1
2
8
VDD
7
ASM3P2879A
REFOUT
3
NC
4
6
NC
ModOUT
5
VSS
Pin Description
Pin#
1
2
3
4
5
6
7
8
Pin Name
XIN / CLKIN
XOUT
REFOUT
NC
VSS
ModOUT
NC
VDD
Type
I
O
O
-
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.
Buffered output of the input frequency.
No connect.
Ground connection.
Spread spectrum clock output.
No connect.
Power supply for the entire chip
Rev. 2 | Page 2 of 12 | www.onsemi.com
ASM3P2879A
Modulation Profile
Specifications
Description
Frequency Range
Modulation Equation
Frequency Deviation
For 2.5V Supply
For 3.3V Supply
Specification
13MHz < CLKIN < 30MHz
13MHz < CLKIN < 30MHz
F
IN
/640
±1% @ 24MHz
Absolute Maximum Ratings
Symbol
VDD, V
IN
T
STG
T
A
T
s
T
J
T
DV
Storage temperature
Operating temperature
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
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.
Rev. 2 | Page 3 of 12 | www.onsemi.com
ASM3P2879A
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
-
-
1.2
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 = 2.5 V, I
OL
= 8mA)
Output high voltage (VDD = 2.5 V, 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 with no load)
Note: 1. XIN/CLKIN pin is pulled low.
AC Electrical Characteristics for 2.5V Supply
Symbol
CLKIN
ModOUT
f
d
t
LH
t
HL
1
1
Parameter
Input frequency
Output frequency
Frequency Deviation
Input Frequency = 13MHz
Input Frequency = 30MHz
Min
13
13
-
-
0.8
0.5
-
45
Typ
-
-
±1.75
±0.80
1.7
0.9
-
50
Max
30
30
-
-
1.9
1.2
200
55
Unit
MHz
MHz
%
nS
nS
pS
%
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
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
ASM3P2879A
DC Electrical Characteristics for 3.3V 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
-
-
-
-
-
2.5
-
-
2.7
-
-
Typ
-
-
-
-
3
3
-
-
1.2
4.5
3.3
-
45
Max
0.8
VDD+0.3
-35
35
-
-
0.4
-
-
-
3.6
5
-
Unit
V
V
µA
µA
mA
mA
V
V
mA
mA
V
mS
Ω
XOUT output low current (@ 0.4V, VDD = 3.3V)
XOUT output high current (@ 2.5V, VDD = 3.3V)
Output low voltage (VDD = 3.3 V, I
OL
= 8mA)
Output high voltage (VDD = 3.3 V, I
OH
= 8mA)
Static supply current
Operating Voltage
Power-up time (first locked cycle after power-up)
Clock output impedance
1
Dynamic supply current (3.3V, 24MHz and with no load)
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