ASM3P2854B PulseCore Semiconductor, ASM3P2854B Datasheet

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ASM3P2854B

Manufacturer Part Number
ASM3P2854B
Description
Custom Clock Generator
Manufacturer
PulseCore Semiconductor
Datasheet
August 2007
rev 0.3
Features
Product Description
ASM3P2854B is a part of the two chip custom clock
generator solution for NEC FAX system. Together with
ASM3P2855A, ASM3P2854B realizes all the seventeen
clocks
subsystems of the FAX system. It uses an inexpensive
24MHz crystal as the input to generate two 66.66MHz low
EMI (spread spectrum) clocks used by ASIC1 for system
/ DDR SDRAM, two 33.33MHz low EMI (spread
spectrum) clocks used by ASIC2 and ASIC3 for system /
DDR SDRAM, a 25MHz low EMI (Spread Spectrum)
clock used by ASIC1 for LCD, Serial port, and buzzer, a
Block Diagram
1715 S. Bascom Ave Suite 200 Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018
required
Generates Custom Clocks for FAX system from
an inexpensive 24MHz Crystal
2x 66.66MHz low EMI (Spread Spectrum) clocks
for ASIC1 (System / DDR SDRAM)
1 x 48MHz for USB1.1 HOST
2 x 33.33MHz low EMI (Spread Spectrum)
clocks for System / DDR SDRAM of ASIC2 and
ASIC3
XIN / CLKIN
by
XOUT
the
various
(24 MHz)
Notice: The information in this document is subject to change without notice.
Crystal
Custom Clock Generator for Fax System
PulseCore Semiconductor Corporation
components
S1
S2
www.pulsecoresemi.com
and
GND
VDD
PLL
PLL
PLL
48MHz clock used by USB1.1 HOST, and a 12MHz clock
used by USB PHY (USB2.0). One of the four
Programmable
24.00448MHz,
20.40464MHz used for Printer Engine control is
selectable through
accuracy of the synthesized programmable clocks is
within +/- 18ppm. The custom clock generator works with
a Supply Voltage for 3.3V. The device is available in a
16L TSSOP Green package, in commercial temperature
range. The output Clocks have an accuracy of ±50ppm.
GND_FOUT
VDD_FOUT
1x 25MHz low EMI (Spread Spectrum) clock for
LCD, Serial port, and buzzer of ASIC1
1x 12MHz for USB PHY (USB2.0)
1x Programmable clock for printer engine control
One of the four programmable clock outputs
selection through two Select Pins
Supply Voltage 3.3V +/- 0.3V
Available in 16L TSSOP, Green package
Commercial Temperature operation
2
2
21.33732MHz,
clock
66.6MHz SSCLK
33.3MHz SSCLK
25MHz SSCLK
48MHz
12MHz
PCLK
two Select pins S1 and S2. The
(PCLK)
ASM3P2854B
21.19962MHz
www.DataSheet4U.com
frequencies
and
of

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ASM3P2854B Summary of contents

Page 1

... EMI (Spread Spectrum) clocks for System / DDR SDRAM of ASIC2 and ASIC3 Product Description ASM3P2854B is a part of the two chip custom clock generator solution for NEC FAX system. Together with ASM3P2855A, ASM3P2854B realizes all the seventeen clocks required ...

Page 2

... Custom Clock Generator for Fax System Notice: The information in this document is subject to change without notice. 25MHz SSCLK PCLK XOUT VDD 66.6MHz SSCLK 13 ASM3P2854B 12 5 66.6MHz SSCLK 6 GND 33.3MHz SSCLK 8 9 12MHz 33.3MHz SSCLK Description www.DataSheet4U.com ASM3P2854B ...

Page 3

... Custom Clock Generator for Fax System Notice: The information in this document is subject to change without notice. Programmable Clock (MHz) 24.00448 21.33732 21.19962 20.40464 Parameter Min Typ 0 +3.0 +3.3 +3.0 +3.3 www.DataSheet4U.com ASM3P2854B Rating Unit -0.5 to +4.6 V -65 to +125 °C 260 °C 150 ° Max Units +70 °C +3 ...

Page 4

... VDD=3.3V) XOH = 15mA 15mA) 2.5 OH 3.0 3.0 Parameter At Pin 7 At Pin 8 At Pins 9 and 10 At Pins 12 and 13 At Pin 15* At Pin 16 Output Frequency = 25MHz Output Frequency = 33.3MHz Output Frequency = 66.6MHz www.DataSheet4U.com ASM3P2854B Typ Max Unit 0.8 V VDD + 0.3 V -35 µA 35 µ 0 ...

Page 5

... ESR Custom Clock Generator for Fax System Notice: The information in this document is subject to change without notice 510Ω Crystal MHz ± 50 ppm or better at 25°C -25°C to +85°C -40°C to +85°C 18pF 7pF maximum 25 Ω www.DataSheet4U.com ASM3P2854B ...

Page 6

... A Seating Plane Dimensions Inches Min Max Min 0.043 0.002 0.006 0.05 0.031 0.041 0.80 0.007 0.012 0.19 0.004 0.008 0.09 0.193 0.201 4.90 0.169 0.177 4.30 0.026 BSC 0.252 BSC 0.020 0.030 0.50 0° 8° 0° www.DataSheet4U.com ASM3P2854B C θ L Millimeters Max 1.20 0.15 1.05 0.30 0.20 5.10 4.50 0.65 BSC 6.40 BSC 0.75 8° ...

Page 7

... G = GREEN PACKAGE, LEAD FREE, and RoHS DEVICE NUMBER X= Automotive (-40C to +125C Reserved 2 = Non PLL based 3 = EMI Reduction 4 = DDR support products 5 = STD Zero Delay Buffer PulseCore Semiconductor Mixed Signal Product www.DataSheet4U.com ASM3P2854B Temperature Commercial Commercial U = MSOP E = TQFP L = LQFP U = MSOP P = PDIP D = QSOP X = SC-70 I= Industrial ...

Page 8

... PulseCore against all claims arising from such use. Custom Clock Generator for Fax System Notice: The information in this document is subject to change without notice. www.DataSheet4U.com ASM3P2854B Copyright © PulseCore Semiconductor All Rights Reserved Preliminary Information Part Number: ASM3P2854B Document Version: 0 ...

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