MK1621-01S [IDT]
Clock Generator, 27MHz, CMOS, PDSO16, 0.150 INCH, SOIC-16;
| 型号： | MK1621-01S |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | Clock Generator, 27MHz, CMOS, PDSO16, 0.150 INCH, SOIC-16 时钟 光电二极管 外围集成电路 晶体 |
| 文件： | 总4页 (文件大小：35K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MK1621
Audio Clock Source
ICR O CLOC K
Description
Features
The MK1621 is a low cost, low jitter, high
performance clock synthesizer designed for audio
systems. Using analog Phase-Locked Loop (PLL)
techniques, the device accepts a 24.576 MHz
crystal or clock input to produce multiple output
clocks. The power down pin turns off the device,
drawing less than 10 µA at 3.3 V.
• Packaged in 16 pin narrow (150 mil) SOIC
• Inexpensive 24.576 MHz crystal or clock input
• Power down turns off chip
• Low jitter
• Four output clocks
• 25 mA output drive capability at TTL levels
• 3.3V or 5V supply voltage
MicroClock offers a wide variety of clock
synthesizers for desktop and portable computers.
Consult MicroClock to eliminate crystals and
oscillators from your board.
• Advanced, low power, sub-micron CMOS process
Block Diagram
VDD GND
3
5
PD
Output
Buffer
Clock Synthesis
and Control
Circuitry
27.000 MHz
13.500 MHz
Output
Buffer
24.576 MHz
crystal
X1
24.576 MHz
24.576 MHz
Output
Buffer
Crystal
Oscillator
X2
(Capacitors optional)
MDS 1621C A
1
Revision 072597
Printed 11/15/00
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
MK1621
Audio Clock Source
ICR O CLOC K
Pin Assignment
X2
1
16
15
14
13
12
11
10
9
X1/ICLK
VDD
2
3
4
5
6
7
NC
VDD
24.5M
24.5M
27M
GND
GND
GND
VDD
GND
PD
GND
8
13.5M
16 pin narrow (150 mil) SOIC
Pin Descriptions
Number
Name
X1/ICLK
VDD
VDD
GND
GND
GND
GND
13.5M
PD
Type Description
1
2
I
P
P
P
P
P
P
O
I
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.
3
4
5
Connect to ground.
6
Connect to ground.
7
Connect to ground.
8
13.500 MHz clock output.
Power Down. Active low. Clocks stop low.
Connect to ground.
9
10
11
12
13
14
15
16
GND
VDD
27M
P
P
O
O
O
-
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.
24.5M
24.5M
NC
X2
O
Crystal connection. Connect to 24.576 MHz crystal. Leave unconnected for clock input.
Key: I = Input, O = output, P = power supply connection
MDS 1621C A
2
Revision 072597
Printed 11/15/00
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
MK1621
Audio Clock Source
ICR O CLOC K
Electrical Specifications
Parameter
Conditions
Minimum
Typical
Maximum Units
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply voltage, VDD
Referenced to GND
7
VDD+0.5
70
V
V
Inputs and Clock Outputs
Ambient Operating Temperature
Soldering Temperature
Storage temperature
Referenced to GND
Max of 10 seconds
-0.5
0
°C
°C
°C
260
-65
150
DC CHARACTERISTICS (VDD = 5V unless noted)
Operating Voltage, VDD
3.0
2
5.5
0.8
0.4
V
V
Input High Voltage, VIH
Input Low Voltage, VIL
V
Output High Voltage, VOH
Output Low Voltage, VOL
IOH=-12mA
IOL=12mA
No Load
VDD-0.4
V
V
Operating Supply Current, IDD, 5.0V
Operating Supply Current, IDD, 3.3V
Power Down Supply Current, IDDPD, 5V
Short Circuit Current
23
13
7
mA
mA
µA
mA
pF
No Load
No Load
Each output
±50
7
Input Capacitance
AC CHARACTERISTICS (VDD = 5V unless noted)
Input Frequency
24.576
MH z
ppm
ppm
ppm
ns
Input Crystal Accuracy
±30
6
Frequency Error, 27 MHz
Frequency Error, 13.5 MHz
6
Output Clock Rise Time
0.8 to 2.0V
2.0 to 0.8V
At VDD/2
1.5
1.5
55
Output Clock Fall Time
ns
Output Clock Duty Cycle
Maximum Absolute Jitter, short term
45
50
%
200
ps
Notes: 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 33Wmay 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 -18)*2, where C is the
L
L
crystal load capacitance in pF. So for a crystal with 20pF load capacitance, the crystal capacitors should be
4pF each.
MDS 1621C A
3
Revision 072597
Printed 11/15/00
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
MK1621
Audio Clock Source
ICR O CLOC K
16 pin SOIC narrow
Package Outline and Package Dimensions
Inches
Symbol Min Max
Millimeters
Min
Max
1.778
0.483
0.254
A
b
0.055 0.070 1.397
0.013 0.019 0.330
0.007 0.010 0.191
c
E
H
D
E
H
e
0.385 0.400 9.779 10.160
0.150 0.160 3.810
0.225 0.245 5.715
4.064
6.223
.050 BSC
0.016
0.01
1.27 BSC
h
0.406
0.254
Q
0.004
0.102
h x 45°
D
A
c
Q
b
e
Ordering Information
Part/Order Number
MK1621-01S
Marking
Shipping packaging
tubes
Package
Temperature
0-70°C
MK1621-01S
MK1621-01S
16 pin SOIC
16 pin SOIC
MK1621-01STR
tape and reel
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.
MDS 1621C A
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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