HD151TS302RP
Spread Spectrum Clock for EMI Solution
ADE-205-655A (Z)
Preliminary
Rev. 1
Sep. 2001
Description
The HD151TS302 is a high-performance Spread Spectrum Clock modulator. It is suitable for low EMI
solution.
Features
Supports 10 MHz to 60 MHz operation. (Designed for XIN = 24 MHz and 48 MHz)
1 copy of clock out with spread spectrum modulation @3.3 V
1 copy of reference clock @3.3 V
Programmable spread spectrum modulation (0.5%, 1.0%, 3.0% down spread modulation and spread
spectrum disable mode.)
SOP8pin
Pin to pin compatible with HD151TS301RP
Key Specifications
Supply voltages : VDD = 3.3 V0.165 V
Ta = 0 to 70C operating range
Clock output duty cycle = 505%
Cycle to cycle jitter =
250 ps typ.
HD151TS302RP
Rev.1, Sep. 2001, page 2 of 9
Block Diagram
Synthesizer
Mode Control
1/n
OSC
SSC Modulator
VDD
CLKOUT
SSCCLKOUT
GND
SEL0
XIN
XOUT
SEL1
1/m
Pin Arrangement
(Top view)
8
SEL1
1
7
CLKOUT
6
SEL0
5
XOUT
SSCCLKOUT
2
VDD
3
GND
4
XIN
HD151TS302RP
Rev.1, Sep. 2001, page 3 of 9
SSC Function Table
SEL1 :0
Spread Percentage
0 0
1.0%
0 1
3.0%
1 0
SSC OFF
1 1
0.5%
Note:
3.0% SSC is selected for default by internal pull-up & down resistors.
Clock Frequency Table
XIN(MHz)
SSCCLKOUT(MHz)
CLKOUT(MHz)
48
48
*1
48
*2
24
24
*1
24
*2
Notes: 1. With spread spectrum modulation.
2. Without spread spectrum modulation.
Pin Descriptions
Pin name
No.
Type
Description
GND
3
Ground
GND pin
VDD
2
Power
Power supplies pin. Normally 3.3 V.
CLKOUT
7
Output
Normally 3.3 V reference clock output.
SSCCLKOUT
1
Output
Spread spectrum modulated clock output.
XIN
4
Input
Oscillator input.
XOUT
5
Output
Oscillator output.
SEL0
6
Input
SSC mode select pin. LVCMOS level input.
Pull-up by internal resistor. (100 k
).
SEL1
8
Input
SSC mode select pin. LVCMOS level input.
Pulldown by internal resistor (100 k
).
HD151TS302RP
Rev.1, Sep. 2001, page 4 of 9
Absolute Maximum Ratings
Item
Symbol
Ratings
Unit
Conditions
Supply voltage
VDD
0.5 to 4.6
V
Input voltage
V
I
0.5 to 4.6
V
Output voltage
*1
V
O
0.5 to
VDD+0.5
V
Input clamp current
I
IK
50
mA
V
I
< 0
Output clamp current
I
OK
50
mA
V
O
< 0
Continuous output current
I
O
50
mA
V
O
= 0 to VDD
Maximum power dissipation
at Ta = 55C (in still air)
0.7
W
Storage temperature
T
stg
65 to +150
C
Notes:
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage
to the device. These are stress ratings only, and functional operation of the device at these or
any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute maximum rated conditions for extended periods may affect device
reliability.
1. The input and output negative voltage ratings may be exceeded if the input and output clamp
current ratings are observed.
Recommended Operating Conditions
Item
Symbol
Min
Typ
Max
Unit Conditions
Supply voltage
VDD
3.135
3.3
3.465
V
DC input signal voltage
0.3
--
VDD+0.3
V
High level input voltage
V
IH
2.0
--
VDD+0.3
V
Low level input voltage
V
IL
0.3
--
0.8
V
Operating temperature
T
a
0
--
70
C
Input clock duty cycle
45
50
55
%
HD151TS302RP
Rev.1, Sep. 2001, page 5 of 9
DC Electrical Characteristics
Ta = 0 to 70C, VDD = 3.3 V5%
Item
Symbol
Min
Typ
Max
Unit
Test Conditions
Input low voltage
V
IL
--
--
0.8
V
Input high voltage
V
IH
2.0
--
--
V
Input current
I
I
--
--
10
A
V
I
= 0 V or 3.465 V,
VDD = 3.465 V, XIN pin
--
--
100
V
I
= 0 V or 3.465 V,
VDD = 3.465 V,
SEL0, SEL1 pins
Input slew rate
1
--
4
V / ns 20% 80%
Input capacitance
C
I
--
--
4
pF
SEL0, SEL1
Operating current
--
7
--
mA
XIN = 24 MHz, C
L
= 0 pF,
VDD = 3.3 V
DC Electrical Characteristics / Clock Output & SSC Clock Output
Ta = 0 to 70C, VDD = 3.3 V5%
Item
Symbol
Min
Typ
Max
Unit
Test Conditions
Output voltage
V
OH
3.1
--
--
V
I
OH
= 1 mA, VDD = 3.3 V
V
OL
--
--
50
mV
I
OL
= 1 mA, VDD = 3.3 V
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