Spansion
®
Analog and Microcontroller
Products
The following document contains information on Spansion analog and microcontroller products. Although the
document is marked with the name “Fujitsu”, the company that originally developed the specification, Spansion
will continue to offer these products to new and existing customers.
Continuity of Specifications
There is no change to this document as a result of offering the device as a Spansion product. Any changes that
have been made are the result of normal document improvements and are noted in the document revision
summary, where supported. Future routine revisions will occur when appropriate, and changes will be noted in a
revision summary.
Continuity of Ordering Part Numbers
Spansion continues to support existing part numbers beginning with “MB”. To order these products, please use
only the Ordering Part Numbers listed in this document.
For More Information
Please contact your local sales office for additional information about Spansion memory, analog, and
microcontroller products and solutions.
FUJITSU MICROELECTRONICS
DATA SHEET
DS04-29129-2E
Spread Spectrum Clock Generator
MB88154A
MB88154A-101/102/103/111/112/113
■
DESCRIPTION
MB88154A is a clock generator for EMI (Electro Magnetic Interference) reduction. The peak of unnecessary
radiation noise (EMI) can be attenuated by making the oscillation frequency slightly modulate periodically with
the internal modulator. It corresponds 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.
■
FEATURE
• Input frequency : 16.6 MHz to 80 MHz
• Output frequency: 16.6 MHz to 80 MHz (One time input frequency)
• Modulation rate can select from
±
0.5%,
±
1.0%,
±
1.5% or
−
1.0%,
−
2.0%,
−
3.0%. (For center spread / down
spread.)
• Equipped with crystal oscillation circuit: Range of oscillation 16.6 MHz to 48 MHz
• The external clock can be input: 16.6 MHz to 80 MHz
• Modulation clock output duty : 40% to 60%
• Modulation clock cycle-cycle jitter : Less than 100 ps
• Low current consumption by CMOS process : 5.0 mA (24 MHz : Typ-sample, no load)
• Power supply voltage : 3.3 V
±
0.3 V
• Operating temperature :
−
40
°C
to
+85 °C
• Package : SOP 8-pin
Copyright©2007-2009 FUJITSU MICROELECTRONICS LIMITED All rights reserved
2009.6
MB88154A
■
PRODUCT LINEUP
MB88154A has two kinds of input frequency, and three kinds of modulation type (center/down spread), total six
line-ups.
Product
Input/Output frequency
Modulation type
MB88154A-101
MB88154A-102
MB88154A-103
MB88154A-111
MB88154A-112
MB88154A-113
50 MHz to 80 MHz
33 MHz to 67 MHz
16.6 MHz to 40 MHz
50 MHz to 80 MHz
33 MHz to 67 MHz
16.6 MHz to 40 MHz
Center spread
Down spread
■
PIN ASSIGNMENT
TOP VIEW
CKOUT 1
V
DD
2
V
SS
3
XIN 4
MB88154A
8 SEL1
7 REFOUT
6 SEL0
5 XOUT
FPT-8P-M02
■
PIN DESCRIPTION
Pin name
CKOUT
V
DD
V
SS
XIN
XOUT
SEL0
REFOUT
SEL1
I/O
O
⎯
⎯
I
O
I
O
I
Pin no.
1
2
3
4
5
6
7
8
Modulated clock output pin
Power supply voltage pin
GND pin
Crystal resonator connection pin/clock input pin
Crystal resonator connection pin
Modulation rate setting pin
Non-modulated clock output pin
Modulation rate setting pin
Description
2
DS04-29129-2E
MB88154A
■
I/O CIRCUIT TYPE
Pin
SEL0
SEL1
Circuit type
Remarks
CMOS hysteresis input
CKOUT
REFOUT
• CMOS output
• I
OL
=
3 mA
Note : For XIN and XOUT pins, refer to “■ OSCILLATION CIRCUIT”
DS04-29129-2E
3
MB88154A
■
HANDLING DEVICES
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.
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.
The attention when the external clock is used
Input the clock to XIN pin, and XOUT pin should be opened when you use the external clock.
Please pay attention so that an overshoot and an undershoot do not occur to an input clock of XIN pin.
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
μF)
and the ceramic capacitor (about 0.01
μF)
in
parallel between V
SS
pin and V
DD
pin near the device, as a bypass capacitor.
Oscillation circuit
Noise near the XIN and XOUT pins may cause the device to malfunction. Design printed circuit boards so that
electric wiring of XIN or XOUT pin and the resonator do not intersect other wiring.
Design the printed circuit board that surrounds the XIN and XOUT pins with ground.
4
DS04-29129-2E
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