Power-down control pin. Pull low to enable power-down mode. Connect to V
DD
if not
used.
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.
Specifications
Description
Frequency Range
Modulation Equation
Frequency Deviation
For 2.5V Supply
For 3.3V Supply
Specification
30MHz < CLKIN < 50MHz
F
IN
/1280
±0.75% (Typ) @ 46MHz
Absolute Maximum Ratings
Symbol
V
DD
, 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
2.375
-40
Max
3.6
+85
15
7
Unit
V
°
C
pF
pF
Rev. 2 | Page 2 of 7 | www.onsemi.com
ASM3P2780A
DC Electrical Characteristics for 2.5V Supply
Symbol
V
IL
V
IH
I
IL
I
IH
I
XOL
I
XOH
V
OL
V
OH
I
DD
I
CC
V
DD
t
ON
Z
OUT
Input low voltage
Input high voltage
Input low current
Input high current
XOUT output low current (@ 0.6V, V
DD
= 2.5V)
XOUT output high current (@ 1.8V, V
DD
= 2.5V)
Output low voltage (V
DD
= 2.5 V, I
OL
= 8mA)
Output high voltage (V
DD
= 2.5 V, I
OH
= 8mA)
Static supply current
Operating Voltage
Power-up time (first locked cycle after power-up)
Output impedance
2
1
Parameter
Min
V
SS
-0.3
2.0
Typ
Max
0.8
V
DD
+0.3
-35
35
Unit
V
V
µA
µA
mA
mA
3
3
0.6
1.8
10
4.0
2.375
2.5
50
2.625
5
V
V
uA
mA
V
mS
Dynamic supply current (2.5V, 46MHz and no load)
Note: 1. XIN / CLKIN pin and PD pin are pulled low.
2. V
DD
and XIN / CLKIN input are stable, PD pin is made high from 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 = 30MHz
Input Frequency = 50MHz
Min
30
30
Typ
Max
50
50
Unit
MHz
MHz
%
±1.10
±0.65
0.7
0.4
45
1.3
0.8
±200
50
55
1.6
1.0
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
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 3 of 7 | www.onsemi.com
ASM3P2780A
DC Electrical Characteristics for 3.3V Supply
Symbol
V
IL
V
IH
I
IL
I
IH
I
XOL
I
XOH
V
OL
V
OH
I
DD
I
CC
V
DD
t
ON
Z
OUT
Input low voltage
Input high voltage
Input low current
Input high current
XOUT output low current (@ 0.4V, V
DD
= 3.3V)
XOUT output high current (@ 2.5V, V
DD
= 3.3V)
Output low voltage (V
DD
= 3.3 V, I
OL
= 8mA)
Output high voltage (V
DD
= 3.3 V, I
OH
= 8mA)
Static supply current
Operating Voltage
Power-up time (first locked cycle after power-up)
Output impedance
2
1
Parameter
Min
V
SS
-0.3
2.0
Typ
Max
0.8
V
DD
+0.3
-35
35
Unit
V
V
µA
µA
mA
mA
3
3
0.4
2.5
10
5.0
2.7
3.3
45
3.6
5
V
V
uA
mA
V
mS
Dynamic supply current (3.3V, 46MHz and no load)
Notes: 1. XIN / CLKIN pin and PD pin are pulled low.
2. V
DD
and XIN / CLKIN input are stable, PD pin is made high from low.
AC Electrical Characteristics for 3.3V Supply
Symbol
CLKIN
ModOUT
f
d
t
LH
t
HL
1
1
Parameter
Input frequency
Output frequency
Frequency Deviation
Input Frequency = 30MHz
Input Frequency = 50MHz
Min
30
30
Typ
Max
50
50
Unit
MHz
MHz
%
±1.10
±0.65
0.5
0.3
1.1
0.8
±200
45
50
55
1.4
1.1
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.
Modulation Profile
Rev. 2 | Page 4 of 7 | www.onsemi.com
ASM3P2780A
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
33MHz
± 50 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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