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840NT4NLGI

Description
Clock Drivers u0026 Distribution Sys DDR Clock B4/T4 25MHz - 200MHz
Categorysemiconductor    Analog mixed-signal IC   
File Size579KB,30 Pages
ManufacturerIDT (Integrated Device Technology, Inc.)
Websitehttp://www.idt.com/
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840NT4NLGI Overview

Clock Drivers u0026 Distribution Sys DDR Clock B4/T4 25MHz - 200MHz

840NT4NLGI Parametric

Parameter NameAttribute value
Product CategoryClock Drivers & Distribution
ManufacturerIDT (Integrated Device Technology, Inc.)
RoHSDetails
Package / CaseVFQFPN-48
PackagingTray
Height0.9 mm
Length7 mm
Moisture SensitiveYes
Factory Pack Quantity260
Width7 mm
System & DDR Clocks for Freescale
B4/T4 Processor Systems
840NT4
DATA SHEET
General Description
The 840NT4 is a PLL-based clock generator designed to interface
with Freescale B4/T4 Processor systems. The clock generator offers
low jitter, low-skew clock outputs, frequency margining (0.025 -
0.312MHz step granularity), and spread spectrum clocking that
meets the ever-growing demands of Freescale’s next generation
processors.
Features
Ten LVCMOS clock outputs: four system clocks, four DDR clocks,
one RTC output, and one 25MHz reference clock
Selectable input reference: crystal oscillator interface or
differential LVPECL input
Output Frequency Range: 25MHz - 200MHz
Serial Interface: I
2
C programmable
Frequency Margining in <0.312MHz steps
Spread spectrum for EMI reduction
VCO range: 2GHz – 2.4GHz
Voltage supply modes:
Core (V
DD
, V
DDXTAL
, V
DDA
) all core voltages must be identical
Output (V
DDO_A
,V
DDO_B
, V
DDO_C,
V
DDO_REF0
, V
DDO_REF1
)
Core / Output
3.3V / 3.3V
3.3V / 2.5V
3.3V / 1.8V
2.5V / 2.5V
2.5V / 1.8V
Output voltage levels are independently selectable
-40°C to 85°C ambient operating temperature
Lead-free (RoHS 6) packaging
Output Frequency Reference Table
XTAL (MHz)
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
FSEL[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
SYSCLK
QA & QB (MHz)
66.67
66.67
66.67
66.67
100
100
100
100
125
125
125
125
133.33
133.33
133.33
133.33
DDRCLK
QC (MHz)
66.67
100
125
133.33
66.67
100
125
133.33
66.67
100
125
133.33
66.67
100
125
133.33
Pin Assignment
GND_QC
SSC_EN
V
DDO_C
V
DDO_C
SDATA
SADR
SCLK
QC3
QC2
QC1
QC0
V
DD
FSEL3
FSEL2
FSEL1
FSEL0
GNDA
V
DDA
GND
V
DD
MR
PLL_SEL
REF_SEL
GND_XTAL
36 35 34 33 32 31 30
29 28 27 26 25
37
24
38
23
39
22
40
21
20
41
840NT4
42
19
43
18
44
17
45
16
46
15
47
14
48
13
1 2
3
4 5 6 7
8
9 10 11 12
V
DDO_REF0
XTAL_OUT
GND_REF
V
DDO_REF1
XTAL_IN
V
DDXTAL
OE_REF
QREF0
QREF1
nPCLK
PCLK
V
DD
OE_C
GND_QB
QB2
QB1
QB0
V
DDO_B
V
DDO_A
QA
OE_A
OE_B
GND_QA
REFOUT_SEL
840NT4
48-lead, 7.0mm x 7.0mm VFQFN
REVISION 1 6/16/14
1
©2014 INTEGRATED DEVICE TECHNOLOGY, INC.

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