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PDF ICS580-01 Data sheet ( Hoja de datos )
| Número de pieza | ICS580-01 | |
| Descripción | Glitch-Free Clock Multiplexer | |
| Fabricantes | Integrated Circuit Systems | |
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ICS580-01
Glitch-Free Clock Multiplexer
Description
The ICS580-01 is a clock multiplexer (mux)
designed to switch between 2 clock sources with no
glitches or short pulses. The operation of the mux is
controlled by an input pin but the part can also be
configured to switch automatically if one of the
input clocks stops. The part also provides clock
detection by reporting when an input clock has
stopped.
For a clock mux with zero delay and smooth
switching, see either the ICS581-01 or ICS581-02.
Block Diagram
Features
• Packaged in 16 pin narrow (150 mil) SOIC
• No short pulses or glitches on output
• Operates to 200 MHz
• Does not add jitter or phase noise to the clock
• User controlled or automatic switching
• Low skew outputs
• Clock detect feature
• Ideal for systems with backup or redundant clocks
• Selectable timeouts for clock detection
• Separate supply voltages allow power supply voltage
translation
• Operates to 2.5 V
VDDI
VDDC
INB
INA
SELB
DIV
1
0
Transition
Detector
Transition
Detector
Timer
CLK1
OE1
CLK2
OE2
NO_INA
OE3
NO_INB
OE4
MDS 580-01 A
1 Revision 030300
Printed 11/28/00
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408) 295-9800tel • www.icst.com
1 page  
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ICS580-01
Glitch-Free Clock Multiplexer
Electrical Specifications
Parameter
Conditions
ABSOLUTE MAXIMUM RATINGS
Minimum
Supply voltage, VDD
Referenced to GND
Inputs and Clock Outputs
Referenced to GND
-0.5
Ambient Operating Temperature
0
Ambient Operating Temperature, I version
Industrial temperature
-40
Soldering Temperature
Max of 10 seconds
Storage temperature
-65
DC CHARACTERISTICS (VDDC = VDDI = 3.3 V unless noted)
Operating Voltage, VDDC
2.5
Operating Voltage, VDDI
VDDC
Input High Voltage, VIH, note 3
INA and INB only
(VDDC/2)+1
Input Low Voltage, VIL, note 3
INA and INB only
Input High Voltage, VIH
Non-clock inputs
2
Input Low Voltage, VIL
Non-clock inputs
Output High Voltage, VOH
IOH=-12mA
VDDC-0.5
Output Low Voltage, VOL
IOL=12mA
Operating Supply Current, IDD
50 MHz inputs, no load
Short Circuit Current
On-chip pull-up resistor, non-clock inputs
Pull-up to VDDC
Input Capacitance
AC CHARACTERISTICS (VDDC = VDDI = 3.3 V unless noted)
Input Frequency, INA and INB. Note 1.
VDDC = 5 V
1/timeout
VDDC = 3.3 V
1/timeout
VDDC = 2.7 V
1/timeout
Propagation Delay, INA or INB to output
VDDC = 5 V
VDDC = 3.3 V
VDDC = 2.7 V
Transition Detector Timeout, DIV=0
VDDI = 5 V
175
VDDI = 3.3 V
500
VDDI = 2.7 V
750
Transition Detector Timeout, DIV=1
VDDI = 5 V
20
VDDI = 3.3 V
55
VDDI = 2.7 V
100
Output Clock Rise Time
Output Clock Fall Time
Output Clock Skew, CLK1 to CLK2
Note 2
-250
Typical
VDDC/2
VDDC/2
6
±70
250
4
4
5
6
350
1000
1500
40
110
200
0
Maximum
7
VDD+0.5
70
85
260
150
5.5
5.5
VDDI
(VDDC/2)-1
VDDC
0.8
0.5
270
220
180
8
10
12
700
2000
3000
80
210
400
1.5
1.5
250
Units
V
V
°C
°C
°C
°C
V
V
V
V
V
V
V
V
mA
mA
kΩ
pF
MHz
MHz
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ps
Note 1. Frequencies less than the minimum may cause a timeout, which will not guarantee glitch-free switching unless the clock is
actually stopped.
Note 2. Assumes identically loaded outputs with identical rise times, measured at VDD/2.
Note 3. Output duty cycle is set by duty cycle of input clock at VDDC/2.
MDS 580-01 A
5 Revision 030300
Printed 11/28/00
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408) 295-9800tel • www.icst.com
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet ICS580-01.PDF ] | |
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