840AG-77
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 7, 2005
1
Integrated
Circuit
Systems, Inc.
ICS840-77
77.76MH
Z
, LVCMOS/LVTTL
O
SCILLATOR
R
EPLACEMENT
PRELIMINARY
G
ENERAL
D
ESCRIPTION
The ICS840-77 is a SONET Oscillator Replace-
ment and a member of the HiPerClocks
TM
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.
F
EATURES
One LVCMOS/LVTTL output, 15 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
0C to 70C ambient operating temperature
Available in both standard and lead-free RoHS-compliant
packages
HiPerClockSTM
ICS
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
1
2
3
4
8
7
6
5
B
LOCK
D
IAGRAM
P
IN
A
SSIGNMENT
Clock
Synthesizer
XTAL_IN
XTAL_OUT
OE
Q0
Pullup
19.44MHz
77.76MHz
Q1
V
DD
XTAL_OUT
XTAL_IN
OE
Q1
Q0
V
DDO
GND
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
2
Integrated
Circuit
Systems, Inc.
ICS840-77
77.76MH
Z
, LVCMOS/LVTTL
O
SCILLATOR
R
EPLACEMENT
PRELIMINARY
T
ABLE
2. P
IN
C
HARACTERISTICS
T
ABLE
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840AG-77
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 7, 2005
3
Integrated
Circuit
Systems, Inc.
ICS840-77
77.76MH
Z
, LVCMOS/LVTTL
O
SCILLATOR
R
EPLACEMENT
PRELIMINARY
T
ABLE
4A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
DD
= V
DDO
= 3.3V0.3V, T
A
= 0C
TO
70C
T
ABLE
5. C
RYSTAL
C
HARACTERISTICS
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
DD
4.6V
Inputs, V
I
-0.5V to V
DD
+ 0.5 V
Outputs, V
O
-0.5V to V
DDO
+ 0.5V
Package Thermal Impedance,
JA
8 Lead TSSOP
101.7C/W (0 mps)
8 Lead SOIC
112.7C/W (0 lfpm)
Storage Temperature, T
STG
-65C to 150C
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanent damage to the
device. These ratings are stress specifications only. Func-
tional operation of product at these conditions or any condi-
tions beyond those listed in the
DC Characteristics
or
AC
Characteristics
is not implied. Exposure to absolute maxi-
mum rating conditions for extended periods may affect prod-
uct reliability.
T
ABLE
4B. LVCMOS/LVTTL DC C
HARACTERISTICS
,
V
DD
= V
DDO
= 3.3V0.3V, T
A
= 0C
TO
70C
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840AG-77
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 7, 2005
4
Integrated
Circuit
Systems, Inc.
ICS840-77
77.76MH
Z
, LVCMOS/LVTTL
O
SCILLATOR
R
EPLACEMENT
PRELIMINARY
T
ABLE
6. AC C
HARACTERISTICS
,
V
DD
= V
DDO
= 3.3V0.3V, T
A
= 0C
TO
70C
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840AG-77
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 7, 2005
5
Integrated
Circuit
Systems, Inc.
ICS840-77
77.76MH
Z
, LVCMOS/LVTTL
O
SCILLATOR
R
EPLACEMENT
PRELIMINARY
P
ARAMETER
M
EASUREMENT
I
NFORMATION
O
UTPUT
R
ISE
/F
ALL
T
IME
3.3V O
UTPUT
L
OAD
AC T
EST
C
IRCUIT
SCOPE
Qx
LVCMOS
1.65V 0.15V
-1.65V 0.15V
Clock
Outputs
20%
80%
80%
20%
t
R
t
F
Q0, Q1
GND
V
DD,
V
DDO
O
UTPUT
D
UTY
C
YCLE
/P
ULSE
W
IDTH
/P
ERIOD
t
PERIOD
t
PW
t
PERIOD
odc =
V
DDO
2
x 100%
t
PW
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