MB88153A
Spread Spectrum Clock Generator
MB88153A is a clock generator for EMI (Electro Magnetic Interference) reduction. The peak of unnecessary (EMI) can
be attenuated by making the oscillation frequency slightly modulate periodically with the internal modulator. It corre-
sponds to both of the center spread which modulates input frequency as Middle Centered and down spread which
modulates so as not to exceed input frequency.
Features
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■
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Power down pin : 10
A (Typ-sample) consumption current at power down
Input frequency : 16.6 MHz to 134 MHz
Output frequency : 16.6 MHz to 134 MHz (One-fold input frequency)
Modulation rate can select from
0.5
,
1.5
Modulation clock output Duty : 40
to 60
Modulation clock Cycle-Cycle Jitter : Less than 100 ps
Low current consumption by CMOS process : 4.0 mA (24 MHz : Typ-sample, no load)
Power supply voltage : 3.3 V
0.3 V
Operating temperature :
Package : 8-pin SOP
1.0
or
3.0
. (For center spread / down spread.)
40 °C to
85 °C
Cypress Semiconductor Corporation
Document Number: 002-08313 Rev. *A
•
198 Champion Court
•
San Jose
,
CA 95134-1709
•
408-943-2600
Revised December 29, 2016
MB88153A
Contents
Product Lineup ................................................................... 3
Pin Assignment ................................................................... 3
Pin Description ................................................................... 3
I/o Circuit Type ................................................................... 4
Handling Devices ................................................................ 5
Preventing Latch-up .................................................... 5
Handling unused pins .................................................. 5
Power supply pins ....................................................... 5
Clock I/O circuit ........................................................... 5
Block Diagram .................................................................... 6
Pin Setting .......................................................................... 7
Absolute Maximum Ratings ............................................... 9
Recommended Operating Conditions .............................. 10
Electrical Characteristics .................................................. 11
DC Characteristics .................................................... 11
AC Characteristics ..................................................... 12
Output Clock Duty Cycle (Tdcc
½
Tb/ta) ......................... 14
Input Frequency (Fin
½
1/tin) ........................................... 14
Output Slew Rate (Sr) ..................................................... 14
Cycle-cycle Jitter .............................................................. 14
Modulation Wave Form .................................................... 15
Lock-up Time .................................................................... 16
Interconnection Circuit Example ....................................... 18
Spectrum Example Characteristics .................................. 19
Ordering Information ......................................................... 20
Package Dimension
.................................................................21
Document History Page .................................................... 22
Sales, Solutions, and Legal Information ........................... 23
Document Number: 002-08313 Rev. *A
Page 2 of 23
MB88153A
1. Product Lineup
MB88153A has four kinds of modulation rate and modulation type (center spread/down spread).
Product
MB88153A-100
MB88153A-101
MB88153A-110
MB88153A-111
Modulation rate
Modulation type
Down spread
Center spread
1.0
3.0
0.5
1.5
2. Pin Assignment
TOP VIEW
CKIN 1
V
DD
2
V
SS
3
CKOUT 4
8
XPD
FREQ0
FREQ1
ENS
MB88153A
7
6
5
FPT-8P-M02
3. Pin Description
Pin name
CKIN
V
DD
V
SS
CKOUT
ENS
FREQ1
FREQ0
XPD
I/O
I
Pin no.
1
2
3
4
5
6
7
8
Description
Clock input pin
Power supply voltage pin
GND pin
Modulated clock output pin
“L” output at power down
Modulation enable setting pin
Frequency setting pin
Frequency setting pin (with pull-up resistor)
Power down pin (with pull-up resistor)
Power down at “L” input
---
---
O
I
I
I
I
Document Number: 002-08313 Rev. *A
Page 3 of 23
MB88153A
4. I/O Circuit Type
Pin
CKIN,
ENS,
FREQ1
Circuit type
Remarks
CMOS hysteresis input
FREQ0
CMOS hysteresis input with pull-up
resistor 50 k
(Typ)
50 kΩ
XPD
50 kΩ
800 kΩ
CMOS hysteresis input with 50 k
800 k
(Typ) pull-up resistors
Note : If “L” is input to XPD when the
XPD function is selected, 50 k
pull-up resistor is disconnected.
(Continued)
Document Number: 002-08313 Rev. *A
Page 4 of 23
MB88153A
(Continued)
Pin
CKOUT
Circuit type
Remarks
CMOS output
“L” output at power down
5. Handling Devices
5.1 Preventing Latch-up
A latch-up can occur if, on this device, (a) a voltage higher than V
DD
or a voltage lower than V
SS
is applied to an input
or output pin or (b) a voltage higher than the rating is applied between V
DD
pin and V
SS
pin. The latch-up, if it occurs,
significantly increases the power supply current and may cause thermal destruction of an element. When you use this
device, be very careful not to exceed the maximum rating.
5.2 Handling unused pins
Do not leave an unused input pin open, since it may cause a malfunction. Handle by, using a pull-up or
pull-down resistor.
Unused output pin should be opened.
5.3 Power supply pins
Please design connecting the power supply pin of this device by as low impedance as possible from the current supply
source.
We recommend connecting electrolytic capacitor (about 10
F) and the ceramic capacitor (about 0.01
F) in parallel
between V
SS
pin and V
DD
pin near the device, as a bypass capacitor.
5.4 Clock I/O circuit
Noise near the CKIN pin may cause the device to malfunction. Design the printed circuit board so that the wiring for the
clock input does not intersect any other wiring.
Please pay attention so that an overshoot and an undershoot do not occur to an input clock of CKIN pin.
Design the printed circuit board that surrounds the CKIN and CKOUT pins with ground.
Document Number: 002-08313 Rev. *A
Page 5 of 23
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