MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
MDS 1621C A
I C R O
C
LOC K
Pin Assignment
X1/ICLK
VDD
VDD
GND
GND
GND
GND
13.5M
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
X2
NC
24.5M
24.5M
27M
VDD
GND
PD
MK1621
Audio Clock Source
16 pin narrow (150 mil) SOIC
Pin Descriptions
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
X1/ICLK
VDD
VDD
GND
GND
GND
GND
13.5M
PD
GND
VDD
27M
24.5M
24.5M
NC
X2
Type
I
P
P
P
P
P
P
O
I
P
P
O
O
O
-
O
Description
Crystal connection. Connect to 24.576 MHz crystal or clock.
Connect to +3.3V or 5V.
Connect to +3.3V or 5V.
Connect to ground.
Connect to ground.
Connect to ground.
Connect to ground.
13.500 MHz clock output.
Power Down. Active low. Clocks stop low.
Connect to ground.
Connect to +3.3V or 5V.
27.000 MHz clock output.
24.576 MHz buffered crystal clock output.
24.576 MHz buffered crystal clock output.
No Connect.
Crystal connection. Connect to 24.576 MHz crystal. Leave unconnected for clock input.
Key: I = Input, O = output, P = power supply connection
2
Revision 072597
Printed 11/15/00
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
MDS 1621C A
I C R O
C
LOC K
Electrical Specifications
Parameter
Supply voltage, VDD
Inputs and Clock Outputs
Ambient Operating Temperature
Soldering Temperature
Storage temperature
Operating Voltage, VDD
Input High Voltage, VIH
Input Low Voltage, VIL
Output High Voltage, VOH
Output Low Voltage, VOL
Operating Supply Current, IDD, 5.0V
Operating Supply Current, IDD, 3.3V
Power Down Supply Current, IDDPD, 5V
Short Circuit Current
Input Capacitance
Input Frequency
Input Crystal Accuracy
Frequency Error, 27 MHz
Frequency Error, 13.5 MHz
Output Clock Rise Time
Output Clock Fall Time
Output Clock Duty Cycle
Maximum Absolute Jitter, short term
Notes:
Conditions
Referenced to GND
Referenced to GND
Max of 10 seconds
-65
3.0
2
IOH=-12mA
IOL=12mA
No Load
No Load
No Load
Each output
VDD-0.4
Minimum
MK1621
Audio Clock Source
Typical
Maximum
7
VDD+0.5
70
260
150
5.5
0.8
0.4
23
13
7
±50
7
24.576
±30
6
6
1.5
1.5
55
Units
V
V
°C
°C
°C
V
V
V
V
V
mA
mA
µA
mA
pF
MHz
ppm
ppm
ppm
ns
ns
%
ps
ABSOLUTE MAXIMUM RATINGS (Note 1)
-0.5
0
DC CHARACTERISTICS (VDD = 5V unless noted)
AC CHARACTERISTICS (VDD = 5V unless noted)
0.8 to 2.0V
2.0 to 0.8V
At VDD/2
45
50
200
1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged
exposure to levels above the operating limits but below the Absolute Maximums may affect device reliability.
External Components
The MK1621 requires a minimum number of external components for proper operation. Decoupling
capacitors of 0.1µF should be connected between VDD and GND on pins 3 and 5, as close to the MK1621
as possible. A series termination resistor of 33Ω may be used for each clock output. If a clock input is not
used, the 24.576 MHz crystal must be connected as close to the chip as possible; if the crystal has a load
capacitance of 18pF or less, no external capacitors are needed for the crystal. If exact tuning is required for
crystals with load capacitance above 18 pF, crystal capacitors should be connected from pins X1 to ground
and X2 to ground. The value (in pF) of these crystal capacitors should be = (C
L
-18)*2, where C
L
is the
crystal load capacitance in pF. So for a crystal with 20pF load capacitance, the crystal capacitors should be
4pF each.
3
Revision 072597
Printed 11/15/00
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
MDS 1621C A
I C R O
C
LOC K
Package Outline and Package Dimensions
MK1621
Audio Clock Source
16 pin SOIC narrow
Symbol
A
b
c
D
E
H
e
h
Q
Inches
Min
Max
0.055 0.070
0.013 0.019
0.007 0.010
0.385 0.400
0.150 0.160
0.225 0.245
.050 BSC
0.016
0.004
0.01
Millimeters
Min
Max
1.397
1.778
0.330
0.483
0.191
0.254
9.779 10.160
3.810
4.064
5.715
6.223
1.27 BSC
0.406
0.102
0.254
E
H
D
Q
e
b
c
h x 45°
A
Ordering Information
Part/Order Number
MK1621-01S
MK1621-01STR
Marking
MK1621-01S
MK1621-01S
Shipping packaging
tubes
tape and reel
Package
16 pin SOIC
16 pin SOIC
Temperature
0-70°C
0-70°C
While the information presented herein has been checked for both accuracy and reliability, MicroClock Incorporated assumes no responsibility for either its use or for the
infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in
normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements
are not recommended without additional processing by MicroClock. MicroClock reserves the right to change any circuitry or specifications without notice. MicroClock does not
authorize or warrant any MicroClock product for use in life support devices or critical medical instruments.
4
Revision 072597
Printed 11/15/00
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
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