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PDF ICS840-77 Data sheet ( Hoja de datos )
| Número de pieza | ICS840-77 | |
| Descripción | CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER | |
| Fabricantes | Integrated Circuit Systems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ICS840-77 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS840-77
77.76MHZ, LVCMOS/LVTTL
OSCILLATOR REPLACEMENT
GENERAL DESCRIPTION
The ICS840-77 is a SONET Oscillator Replace-
ICS ment and a member of the HiPerClocksTM
HiPerClockS™ family of high performance devices from ICS.
The ICS840-77 uses a 19.44MHz crystal to
synthesize 77.76MHz. The ICS840-77 has
excellent jitter performance. The ICS840-77 is packaged in
a small 8-pin TSSOP, making it ideal for use in systems with
limited board space.
www.DataSheet4U.com
FEATURES
• One LVCMOS/LVTTL output, 15Ω output impedence
• Crystal oscillator interface designed for 19.44MHz,
18pF parallel resonant crystal
• Output frequency: 77.76MHz
• Random jitter: 2.82ps (typical)
• Deterministic jitter: 0.205ps (typical)
• 3.3V operating supply
• 0°C to 70°C ambient operating temperature
• Available in both standard and lead-free RoHS-compliant
packages
BLOCK DIAGRAM
OE Pullup
19.44MHz
XTAL_IN
XTAL_OUT
Clock
Synthesizer
77.76MHz
Q0
Q1
PIN ASSIGNMENT
VDD
XTAL_OUT
XTAL_IN
OE
1
2
3
4
8 Q1
7 Q0
6 VDDO
5 GND
ICS840-77
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
ICS840-77
8-Lead SOIC
3.90mm x 4.92mm x 1.37mm body package
M Package
Top View
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on
initial product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications
without notice.
840AG-77
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 7, 2005
1
1 page  
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS840-77
77.76MHZ, LVCMOS/LVTTL
OSCILLATOR REPLACEMENT
PARAMETER MEASUREMENT INFORMATION
1.65V ± 0.15V
VDD,
www.DataSheet4UV.cDoDOm
LVCMOS
GND
-1.65V ± 0.15V
SCOPE
Qx
Q0, Q1
t PW
V
DDO
2
t
PERIOD
odc = t PW x 100%
t PERIOD
3.3V OUTPUT LOAD AC TEST CIRCUIT
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
20%
Clock
Outputs
80%
tR
80%
tF
20%
OUTPUT RISE/FALL TIME
840AG-77
www.icst.com/products/hiperclocks.html
5
REV. A NOVEMBER 7, 2005
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ICS840-77.PDF ] | |
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