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PDF ICS9248-80 Data sheet ( Hoja de datos )
| Número de pieza | ICS9248-80 | |
| Descripción | Frequency Generator & Integrated Buffers | |
| Fabricantes | Integrated Circuit Systems | |
| Logotipo |  |
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Integrated
Circuit
Systems, Inc.
ICS9248 - 80
General Purpose 133MHz System Clock
General Description
The ICS9248-80 is a general purpose system clock. It
provides 8 output CLKs, 1 REF CLK and excellent power
management features through CLK_STOP#.
Spread spectrum may be enabled through I2C programming.
Spread spectrum typically reduces EMI by 8dB to 10 dB.
This simplifies EMI qualification without resorting to board
design iterations or costly shielding. The ICS9248-80
employs a proprietary closed loop design, which tightly
controls the percentage of spreading over process and
temperature variations.
Features
Extended temperature range (-20°C to +70°C)
Output features:
- 8 CLK outputs @ 3.3V, up to 133.34MHz.
- 1-REF output @ 3.3V, 14.31818MHz.
Spread Spectrum for EMI control
I2C interface to stop clocks, select spread and frequency.
Excellent power managment feature through CLK_STOP#
and individual stop clocks through I2C.
Input is from a 14.31818MHz crystal.
Block Diagram
Pin Configuration
9248-80 Rev A 3/21/00
28-Pin 209 mil SSOP
* These inputs have a 120K internal pull-up to 3.3V.
** These inputs have a 120K internal pull-down to GND.
Pentium II is a trademark of Intel Corporation
I2C is a trademark of Philips Corporation
ICS reserves the right to make changes in the device data identified in
this publication without further notice. ICS advises its customers to
obtain the latest version of all device data to verify that any
information being relied upon by the customer is current and accurate.
1 page  
ICS9248 - 80
Absolute Maximum Ratings
Core Supply Voltage . . . . . . . . . . . . . . . . . . . . . . 4.6V
I/O Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . 3.6V
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND 0.5 V to VDD +0.5 V
Ambient Operating Temperature . . . . . . . . . . . . 20°C to +70°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . 65°C to +150°C
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are
stress specifications only and functional operation of the device at these or any other conditions above those listed in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may affect product reliability.
Electrical Characteristics - Input/Supply/Common Output Parameters
TA = -20°C - +70º C; Supply Voltage VDD = 3.3 V +/-5% (unless otherwise stated)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
Input Low Current
Operating Supply Current
VIH
VIL
IIH
IIL1
IIL2
IDD2.5OP
VIN = VDD
VIN = 0 V; Inputs with no pull-up resistors
VIN = 0 V; Inputs with pull-up resistors
CL = 0 pF; Select @ 66 MHz
2
VSS-0.3
-5
-200
VDD+0.3 V
0.8 V
0.1 5 µA
2.0 µA
-100 µA
50 100 mA
Input frequency
Fi VDD = 3.3 V;
Input Capacitance1
Transition Time1
Settling Time1
Clk Stabilization1
CIN
CINX
TTrans
TS
TSTAB
Logic Inputs
X1 & X2 pins
To first crossing of target Freq.
From first crossing to 1% of target Freq.
From VDD = 3.3 V to 1% target Freq.
1Guaranteed by design, not 100% tested in production.
14.318
6
1.3
0.3
<3
5
2
3
MHz
pF
pF
ms
ms
ms
5
5 Page | ||
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| PDF Descargar | [ Datasheet ICS9248-80.PDF ] | |
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