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ICS840-77

Integrated Circuit Systems
Part Number ICS840-77
Manufacturer Integrated Circuit Systems
Description CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER
Published Jul 14, 2008
Detailed Description PRELIMINARY Integrated Circuit Systems, Inc. ICS840-77 77.76MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT FEATURES • One LV...
Datasheet PDF File ICS840-77 PDF File

ICS840-77
ICS840-77

Overview
PRELIMINARY Integrated Circuit Systems, Inc.
ICS840-77 77.
76MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT 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 GENERAL DESCRIPTION The ICS840-77 is a SONET Oscillator Replacement and a member of the HiPerClocks TM 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.
IC S www.
DataSheet4U.
com BLOCK DIAGRAM OE Pullup 77.
76MHz 19.
44MHz PIN ASSIGNMENT Q0 VDD XTAL_OUT XTAL_IN OE 1 2 3 4 8 7 6 5 Q1 Q0 VDDO GND XTAL_IN Clock Synthesizer Q1 ICS840-77 8-Lead TSSOP 4.
40mm x 3.
0mm x 0.
925mm package body G Package Top View XTAL_OUT 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 PRELIMINARY Integrated Circuit Systems, Inc.
ICS840-77 77.
76MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT Type Power Input Input Power Power Pullup Description Power supply pin.
Cr ystal oscillator interface.
XTAL_IN is the input, XTAL_OUT is the output.
Output enable pin.
When HIGH, outputs are enabled.
When LOW, forces outputs to HiZ state.
LVCMOS/LVTTL interface levels.
Power supply ground.
TABLE 1.
PIN DESCRI...


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