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PDF SM8761 Data sheet ( Hoja de datos )
| Número de pieza | SM8761 | |
| Descripción | Spread Spectrum Clock Generator | |
| Fabricantes | Nippon Precision Circuits | |
| Logotipo |  |
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SM8761 series
Spread Spectrum Clock Generator
OVERVIEW
The SM8761 series are compact clock generator ICs that have a spread spectrum (SS) function to reduce unde-
sirable EMI radiation. They have a built-in crystal oscillator circuit, PLL, and loop filter. They accept an input
www.DataSheet4U.ccolmock signal, generated using an external crystal or direct external clock input, and output an SS-modulated
clock signal. In addition, versions are available for center spread and down spread modulation mode, and all
have a mode control pin to select the SS modulation function.
FEATURES
I Spread spectrum clock output to reduce EMI
I Correspond to wide range of output frequency
I Low jitter
I Operating supply voltage: 3.3 ± 0.3V
I Multiplication: 1-time multiplication
I Package: 8-pin SOP
Spectrum modulation mode
Spectrum modulation rate*1
Crystal element connection
Input frequency
External input clock
Output frequency
Multiplication
Jitter (Cycle-to-Cycle)
SM8761AA
Down spread
– 1.0% to – 3.8%
20MHz to 40MHz
20MHz to 108MHz
20MHz to 108MHz
1-time multiplication
200ps (typ) @33MHz
120ps (typ) @75MHz
SM8761AB
Center spread
± 0.75% to ± 2.25%
12MHz to 32MHz
12MHz to 32MHz
12MHz to 32MHz
1-time multiplication
200ps (typ) @16MHz
*1. The modulation rate that can be selected varies with the input frequency.
PINOUT
(Top view)
PACKAGE DIMENSIONS
(Unit: mm)
XT 1
VDD 2
VSS 3
CLKOUT 4
8 XTN
7 MSEL1
6 MSEL0
5 TSTN
0.695typ
5.2 ± 0.3
0.15
+
−
0.1
0.05
APPLICATIONS
I Printer (laser/inkjet)
I Photocopiers, scanners
I LCD/PDP displays
I Projectors
I Miscellaneous electronic equipment
1.27
0.10
0.4 ± 0.1 0.12 M
0 to 10°
ORDERING INFORMATION
Device
SM8761AAS
SM8761ABS
Package
8-pin SOP
NIPPON PRECISION CIRCUITS INC.—1
1 page  
SM8761 series
SM8761AB
VDD = 3.3 ± 0.3V, VSS = 0V, Ta = −20 to +80°C unless otherwise noted.
Parameter
Current
consumption
www.DataSheet4U.com
Input voltage
Input current
Output voltage
Symbol
Pins
Condition
VDD = 3.3V, Ta = 25°C,
external input clock, fin = 12MHz,
all outputs unloaded
IDD VDD
VDD = 3.3V, Ta = 25°C,
external input clock, fin = 24MHz,
all outputs unloaded
VIH1
VIM1 MSEL0, MSEL1 VDD = 3.3V
VIL1
VIH2
TSTN
VDD = 3.3V
VIL2
VIH3
XT VDD = 3.3V
VIL3
IIH1 VIN = VDD
MSEL0, MSEL1
IIL1 VIN = 0V
IIH2 VIN = VDD, built-in pull-up resistor
TSTN
IIL2 VIN = 0V, built-in pull-up resistor
IIH3 VIN = VDD
XT
IIL3 VIN = 0V
VOH IOH = −2mA
CLKOUT
VOL IOL = 2mA
Rating
min typ max
–58
– 6 10
0.85VDD
0.45VDD
–
0.85VDD
–
0.80VDD
–
–
–1
–
–100
–
–40
VDD – 0.4
–
–
0.50VDD
–
–
–
–
–
–
–
–
–
–
–
–
–
–
0.55VDD
0.15VDD
–
0.15VDD
–
0.20VDD
1
–
1
–
40
–
–
0.4
Unit
mA
V
µA
V
NIPPON PRECISION CIRCUITS INC.—5
5 Page 
www.DataSheet4U.com
SM8761 series
Please pay your attention to the following points at time of using the products shown in this document.
The products shown in this document (hereinafter “Products”) are not intended to be used for the apparatus that exerts harmful influence on
human lives due to the defects, failure or malfunction of the Products. Customers are requested to obtain prior written agreement for such
use from NIPPON PRECISION CIRCUITS INC. (hereinafter “NPC”). Customers shall be solely responsible for, and indemnify and hold NPC
free and harmless from, any and all claims, damages, losses, expenses or lawsuits, due to such use without such agreement. NPC reserves
the right to change the specifications of the Products in order to improve the characteristic or reliability thereof. NPC makes no claim or
warranty that the contents described in this document dose not infringe any intellectual property right or other similar right owned by third
parties. Therefore, NPC shall not be responsible for such problems, even if the use is in accordance with the descriptions provided in this
document. Any descriptions including applications, circuits, and the parameters of the Products in this document are for reference to use the
Products, and shall not be guaranteed free from defect, inapplicability to the design for the mass-production products without further testing
or modification. Customers are requested not to export or re-export, directly or indirectly, the Products to any country or any entity not in
compliance with or in violation of the national export administration laws, treaties, orders and regulations. Customers are requested
appropriately take steps to obtain required permissions or approvals from appropriate government agencies.
NIPPON PRECISION CIRCUITS INC.
4-3, Fukuzumi 2-chome, Koto-ku,
Tokyo 135-8430, Japan
Telephone: +81-3-3642-6661
Facsimile: +81-3-3642-6698
http://www.npc.co.jp/
Email: sales@npc.co.jp
NC0408AE 2004.12
NIPPON PRECISION CIRCUITS INC.—11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet SM8761.PDF ] | |
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