1www.pericom.com PI6C490098 RevA 2/06/2012
PI6C490098
Features
ÎSupport XTAL or Clock input at 25MHz
Îree buered outputs support VDD operation
ÎVery low phase jitter(RMS) : < 0.5ps
ÎVery low additive jitter: <300fs (typ)
Î3.3V supply voltage for Core
Î1.8V ~ 3.3V supply voltage for two outputs
ÎPackaging: 16-pin TSSOP
ÎCommercial & Industrial Temperature support
Applications
ÎNetworking Systems
ÎFemtocell BTS
ÎPeripheral
Block Diagram Pin Conguration (16-Pin TSSOP)
Description
e PI6C490098 is a low jitter clock buer 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 eective way to
generate multiple outputs for all kinds of applications that need
25MHz with dierent power supplies.
1:3 25MHz Clock Buffer
X2
GND
VDD
CLK1
CLK2
VDDO
CLK3
GND
X1/ICLKIN
VDD
GND
VDD
NC
NC
GND
OE#
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
16-pin (173 mil) TSSOP
X1/CLKIN Crystal
Oscillator
OE#
CLK3
V
V
CLK2
CLK1
GND
X2
DDO
DD
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2www.pericom.com PI6C490098 RevA 2/06/2012
PI6C490098
1:3 25MHz Clock Buer
Function Table
Pin number Pin Name Type Description
1 X1/CLKIN Input Crystal connection or clock input
2, 4, 14 VDD Power 3.3V Supply voltage for core and CLK1
5, 6, NC No connect
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 VDDO Power Supply voltage from 1.8V to 3.3V for CLK2 and CLK3
12 CLK2 Output Clock Output 2
13 CLK1 Output Clock Output 1
16 X2 Output Crystal connection
OE# CLK1/CLK2/CLK3
0 Enabled
1 Hi-Z, weak pull down
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3www.pericom.com PI6C490098 RevA 2/06/2012
PI6C490098
1:3 25MHz Clock Buer
Power Requirements(Over operating free-air temperature range)
Storage Temperature .......................................................... –65°C to +150°C
Supply Voltage to Ground Potential, VDD ........................–0.5V to +4.6V
Note: Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the device. is 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 specication is not implied. Exposure to absolute
maximum rating conditions for extended periods may aect
reliability.
Maximum Ratings
(Above which useful life may be impaired. For user guidelines, not tested.)
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
TAAmbient Operating Temperature 0 +70 °C
-40 +85
tUP Power Supply Ramp Time 4 ms
Symbol Parameter Condition Min. Typ. Max. Units
VIH Input High Voltage CLKIN, OE# VDD/2+1 V
VIL Input Low Voltage CLKIN, OE# VDD/2-1 V
VOH Output High Voltage IOH = -8mA VDDO – 0.4 V
VOL Output Low Voltage IOL = 8mA 0.4 V
ZONominal Output Impedance 20 W
RPD Internal Pull-down Resistor OE# 230 kW
CLKIN 320
CIN Input Capacitance OE# 5 pF
CLKIN 7
DC Electrical Characteristics
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4www.pericom.com PI6C490098 RevA 2/06/2012
PI6C490098
1:3 25MHz Clock Buer
AC Electrical Characteristics (Note 4)
Symbol Parameter Conditions Min. Typ. Max. Units
FIN Input Frequency Fundamental Crystal 25 MHz
Input Clock 25 MHz
tROutput Rise Time 20% to 80% 25MHz, Note 1, 1 ns
tFOutput Fall Time 80% to 20% 25MHz, Note 1, 1 ns
tDC Duty Cycle Note 2 50 53 %
Ferror Output Frequency Synthesis Error 0 ppm
Jphase Clock Phase Jitter (RMS) 25MHz, Note 2 0.5 1.5 ps
Jadd Additive Jitter 25MHz, Note 3, 300 fs
1. Note 1: Measured with 7 pF lump load.
2. Note 2: 12 kHz to 20 MHz oset frequency using a crystal input.
3. Note 3: CLKIN input with X2 oating.
4. Note 4: Do not drive this device without a crystal or valid clock input
VDD
CLOAD (7pF lump load)
VDD
GND GND
CLK out
OUTPUTS
0.1µF
0.1µF
VDD
VDDO
CMOS Test Conguration
C1
20pF
Crystal�(CL�=�16pF)
C2
20pF
X1
X2
Crystal Oscillator Circuit
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5www.pericom.com PI6C490098 RevA 2/06/2012
PI6C490098
1:3 25MHz Clock Buer
1
DESCRIPTION: 16-Pin, 173-Mil Wide, TSSOP
PACKAGE CODE: L
DOCUMENT CONTROL NO.
PD - 1310
REVISION: E
DATE: 03/09/05
Note:
1. Package Outline Exclusive of Mold Flash and Metal Burr
2. Controlling dimentions in millimeters
3. Ref: JEDEC MO-153F/AB
Pericom Semiconductor Corporation
3545 N. 1st Street, San Jose, CA 95134
1-800-435-2335 • www.pericom.com
.193
.201
.047
max.
.002
.006
SEATING
PLANE
.0256
BSC
.018
.030
.004
.008
.252
BSC
1
16
.169
.177
0.05
0.15
6.4
0.45
0.75
0.09
0.20
4.3
4.5
1.20
4.9
5.1
0.65 0.19
0.30
.007
.012
Pericom Semiconductor Corporation • 1-800-435-2336
Packaging Mechanical: 16-Pin TSSOP (L)
Ordering Information
Ordering Code Package Code Package Type Operating Temperature
PI6C490098LE L Pb-free & Green, 16-pin TSSOP Commercial
PI6C490098LIE 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 sufx = Tape/Reel
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