Datasheet

PI6C490094
1:4 24MHz Clock Buffer
Features
Description
ÎÎSupport XTAL or Clock input at 24MHz
The PI6C490094 is a low jitter clock buffer supporting either
XTAL or reference input. Two of its outputs can support wide
operating voltage from 1.8V to 3.3V. It is a cost effective way to
generate multiple outputs for all kinds of applications that need
24MHz with different power supplies.
ÎÎFour buffered outputs support VDDO operation
ÎÎVery low phase jitter(RMS) : < 1.5ps (max)
ÎÎVery low additive jitter: <300fs (typ)
ÎÎ3.3V supply voltage for Core
ÎÎ1.8V ~ 3.3V supply voltage for
two output banks
ÎÎPackaging: 16-pin TSSOP
ÎÎCommercial & Industrial Temperature support
Applications
ÎÎNetworking Systems
ÎÎFemtocell BTS
ÎÎPeripheral
Block Diagram
Pin Configuration (16-Pin TSSOP)
VDD
VDDO1
CLK1
CLK2
X1/CLKIN
X2
Crystal
Oscillator
CLK3
CLK4
GND
13-0129
OE# V
DDO2
X1/ICLKIN
1
16
X2
VDD
2
15
GND
GND
3
14
VDD
VDD
4
13
CLK1
VDD02
5
12
CLK2
CLK4
6
11
VDDO1
GND
7
10
CLK3
OE#
8
9
GND
16-pin (173 mil) TSSOP
1
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PI6C490094
Rev A
08/09/13
PI6C490094
1:4 24MHz Clock Buffer
Pin number
Pin Name
Type
Description
1
X1/CLKIN
Input
Crystal connection or clock input
2, 4, 14
VDD
Power
Supply voltage 3.3V
5
VDDO2
Power
Supply voltage from 1.8V to 3.3V for CLK3 and CLK4
6
CLK4
Output
Clock Output 4
7, 9, 15
GND
Power
Connect to Ground
8
OE#
Input
Global output enable when low. Internal pull-down resistor.
10
CLK3
Output
Clock Output 3
11
VDDO1
Power
Supply voltage from 1.8V to 3.3V for CLK1 and CLK2
12
CLK2
Output
Clock Output 2
13
CLK1
Output
Clock Output 1
16
X2
Output
Crystal connection
Function Table
OE#
CLK1/CLK2/CLK3/CLK4
0
Enabled
1
Hi-Z, weak pull down
13-0129
2
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PI6C490094
Rev A
08/09/13
PI6C490094
1:4 24MHz Clock Buffer
Maximum Ratings
(Above which useful life may be impaired. For user guidelines, not tested.)
Note: Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at these
or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
reliability.
Storage Temperature........................................................... –65°C to +150°C
Ambient Temperature with Power Applied ...................... -40ºC to+85ºC
Supply Voltage to Ground Potential, VDD .........................–0.5V to +4.6V
ESD Protection (HBM) ........................................................................ 2000V
Power Requirements(Over operating free-air temperature range)
Symbol
Parameter
Min.
Typ.
Max.
Units
VDD
Power Supply Voltage
3.135
3.3
3.465
V
VDDO
Power Supply Voltage for outputs
1.71
3.465
V
IDD
Power supply current, no load
5
mA
TA
Ambient Operating Temperature
tUP
Power Supply Ramp Time
0
+70
-40
+85
°C
4
ms
DC Electrical Characteristics
Symbol
Parameter
Condition
Min.
VIH
Input High Voltage
CLKIN, OE#
VDD/2+1
VIL
Input Low Voltage
CLKIN, OE#
VOH
Output High Voltage
IOH = -8mA
VOL
Output Low Voltage
IOL = 8mA
ZO
Nominal Output Impedance
R PD
Internal Pull-down Resistor
CIN
Input Capacitance
13-0129
Typ.
Max.
V
VDD/2-1
V
W
20
OE#
170
CLKIN
220
OE#
4
CLKIN
7.5
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V
V
VDDo – 0.4
0.4
3
Units
PI6C490094
kW
pF
Rev A
08/09/13
PI6C490094
1:4 24MHz Clock Buffer
AC Electrical Characteristics
Symbol
Parameter
FIN
Input Frequency
tR
(Note 4)
Conditions
Min.
Typ.
Max.
Units
Fundamental Crystal
24
MHz
Input Clock
24
MHz
Output Rise Time
20% to 80% 24MHz, Note 1
1
ns
tF
Output Fall Time
80% to 20% 24MHz, Note 1
1
ns
tDC
Duty Cycle
Jphase
Clock Phase Jitter (RMS)
24MHz, Note 2
Jadd
Additive Jitter
24MHz, Note 3
47
53
%
1.5
ps
300
fs
1. Note 1: Measured with 7 pF lump load.
2. Note 2: 12 kHz to 20 MHz offset frequency using a crystal input.
3. Note 3: CLKIN input with X2 floating.
4. Note 4: Do not drive this device without a crystal or valid clock input
0.1µF
VDD
OUTPUTS
0.1µF
CLOAD
VDD
GND
CLK out
GND
CMOS Test Configuration
13-0129
4
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PI6C490094
Rev A
08/09/13
PI6C490094
1:4 24MHz Clock Buffer
Crystal Oscillator Circuit
X1
C1
24pF
Crystal�(CL�=�16pF)
X2
C2
24pF
Typical Crystal Requirement
Parameter
Minimum
Typical
Maximum
Mode of Oscillation
Fundamental
Frequency
24
Units
MHz
Equivalent Series Resistance
(ESR)
50
Ω
Shunt Capacitance
7
pF
Drive Level
1
mW
Recommended Crystal Specification
Pericom recommends:
a) FL2400068, SMD 3.2x2.5(4P), 24MHz, CL=18pF, -20~70C, +/-20ppm, http://www.pericom.com/pdf/datasheets/se/FL.pdf
b) FL2400075, SMD 3.2x2.5(4P), 24MHz, CL=18pF, -40~85C, +/-20ppm, http://www.pericom.com/pdf/datasheets/se/FL.pdf
b) FY2400041, SMD 5x3.2(4P), 24MHz, CL=18pF, -20~70C, +/-30ppm, http://www.pericom.com/pdf/datasheets/se/FY_F9.pdf
For other crystal options, please contact Pericom sales.
Thermal Information
Symbol
Description
QJA
Junction-to-ambient thermal resistance
QJC
Junction-to-case thermal resistance
13-0129
Condition
Still air
84.0 OC/W
17.0 OC/W
5
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PI6C490094
Rev A
08/09/13
PI6C490094
1:4 24MHz Clock Buffer
Packaging Mechanical: 16-Pin TSSOP (L)
DATE: 05/03/12
Notes:
1. Refer JEDEC MO-153F/AB
2. Controlling dimensions in millimeters
3. Package outline exclusive of mold flash and metal burr
DESCRIPTION: 16-Pin, 173mil Wide TSSOP
PACKAGE CODE: L
DOCUMENT CONTROL #: PD-1310
REVISION: F
12-0372
Ordering Information
Ordering Code
Package Code
Package Type
Operating Temperature
PI6C490094LE
L
Pb-free & Green, 16-pin TSSOP
Commercial
PI6C490094LIE
L
Pb-free & Green, 16-pin TSSOP
Industrial
Notes:
• Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
• E = Pb-free and Green
• X suffix = Tape/Reel
Pericom Semiconductor Corporation • 1-800-435-2336
13-0129
6
www.pericom.com
PI6C490094
Rev A
08/09/13