PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS840-77
77.76MH
Z
, LVCMOS/LVTTL
O
SCILLATOR
R
EPLACEMENT
F
EATURES
•
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
G
ENERAL
D
ESCRIPTION
The ICS840-77 is a SONET Oscillator Replace-
ment 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
B
LOCK
D
IAGRAM
OE
Pullup
77.76MHz
19.44MHz
P
IN
A
SSIGNMENT
Q0
V
DD
XTAL_OUT
XTAL_IN
OE
1
2
3
4
8
7
6
5
Q1
Q0
V
DDO
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
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
