DATASHEET
Low Power Clock for Intel Atom
®
-Based Systems
Recommended Application:
NM10 Express Chipset + N450/D410/D510 Atom
®
CPUs
Output Features:
•
2 - 0.8V push-pull differential CPU pairs
•
2 - 0.8V push-pull differential PCIEX pairs
•
1 - 0.8V push-pull differential SATA75 pair
•
1 - 0.8V push-pull differential DOT96 pair
•
1 - 0.8V push-pull differential CPU/PCIEX selectable pair
•
1 - PCI (33MHz)
•
1 - PCICLK_F, (33MHz) free-running
•
1 - USB, 48MHz
•
1 - 12/48MHz
•
1 - 25MHz
•
1 - REF, 14.318MHz
•
1 - 12.288MHz
9LPRS436C
Key Specifications:
•
CPU outputs cycle-cycle jitter < 85ps
•
PCIEX outputs cycle-cycle jitter < 125ps
•
SATA outputs cycle-cycle jitter < 125ps
•
PCI outputs cycle-cycle jitter < 500ps
•
+/- 100ppm frequency accuracy on all clocks
Features/Benefits:
•
VDDSUSP allows 25MHz to run in S-states
•
Supports programmable spread percentage
•
Uses external 25MHz crystal, external crystal load caps
are required for frequency tuning
•
PEREQ# pins to support PCIEX/SATA power
management.
•
Low power differential clock outputs (No 50Ω resistor to
GND needed)
•
Integrated 33Ω series resistor on all differential outputs.
Pin Configuration
**FS3/12_288M_2x
VDD12_288
PEREQ1#
PEREQ2#
**FS4/PCICLK0_2x
GND
VDDPCI
**ITP_EN/PCICLK_F0_2x
PEREQ3#
*SEL12_48#/12_48MHz_2x
VDD
FS
L
A/USB48_2x
GND
DOTT_96MHzLR
DOTC_96MHzLR
FS
L
B
GNDSATA
SATAT_LR/PCIeT_LR3
SATAC_LR/PCIeC_LR3
VDDSATA
PCIeT_LR0
PCIeC_LR0
PCIeT_LR1
PCIeC_LR1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
GND
GND
REF0_2x/FSLC
VDD14
Vtt_PwrGd/WOL_STOP#
VDDSUSP
25MHz
GND
X1_25
X2_25
PCI&PCIEX_STOP#
CPU_STOP#
SDATA
SCLK
GND
CPUT_LR0
CPUC_LR0
VDDCPU
CPUT_LR1
CPUC_LR1
CPUITPT_LR2/PCIeT_LR2
CPUITPC_LR2/PCIeC_LR2
VDDPCIEX
GND
48-TSSOP
* Internal Pull-Up Resistor
** Internal Pull-Down Resistor
IDT
®
Low Power Clock for Intel Atom
®
-Based Systems
9LPRS436
1561C —08/24/11
1
9LPRS436C
Low Power Clock for Intel Atom
®
-Based Systems
Vtt_PwrGd/WOL_STOP#
PCI&PCIEX_STOP#
REF0_2x/FSLC
48 47 46 45 44 43 42 41 40 39 38 37
**FS3/12_288M_2x
1
VDD12_288
2
PEREQ1#
3
PEREQ2#
4
**FS4/PCICLK0_2x
5
GND
6
VDDPCI
7
**ITP_EN/PCICLK_F0_2x
8
PEREQ3#
9
*SEL12_48#/12_48MHz_2x
10
VDD
11
FSLA/USB48_2x
12
13 14 15 16 17 18 19 20 21 22 23 24
DOTT_96MHzLR
PCIeT_LR0
DOTC_96MHzLR
PCIeC_LR0
PCIeT_LR1
SATAT_LR/PCIeT_LR3
SATAC_LR/PCIeC_LR3
PCIeC_LR1
GNDSATA
VDDSATA
GND
FSLB
36
SDATA
35
SCLK
34
GND
33
CPUT_LR0
32
CPUC_LR0
31
VDDCPU
30
CPUT_LR1
29
CPUC_LR1
28
CPUITPT_LR2/PCIeT_LR2
27
CPUITPC_LR2/PCIeC_LR2
26
VDDPCIEX
25
GND
9LPRS436
48 MLF
6x6mm
0.4mm pitch
* Internal Pull-Up Resistor
** Internal Pull-Down Resistor
IDT
®
Low Power Clock for Intel Atom
®
-Based Systems
CPU_STOP#
VDDSUSP
VDD14
25MHz
X1_25
X2_25
GND
GND
GND
1561C — 08/24/11
2
9LPRS436C
Low Power Clock for Intel Atom
®
-Based Systems
Pin Description
PIN #
PIN NAME
1
**FS3/12_288M_2x
2
VDD12_288
3
PEREQ1#
TYPE
DESCRIPTION
I/O
Frequency select latch input pin / 12.288MHz output, 3.3V
PWR Power for 12.288MHz PLL and output buffer, nominal 3.3V.
Real-time input pin that controls SATACLK and PCIEXCLK outputs that are
IN
selected through the SMBus. 1 = selected outputs are disabled, 0 = selected
outputs are enabled.
Real-time input pin that controls SATACLK and PCIEXCLK outputs that are
IN
selected through the SMBus. 1 = selected outputs are disabled, 0 = selected
outputs are enabled.
I/O
Frequency select latch input pin / 3.3V PCI clock output.
PWR Ground pin.
PWR Power supply for PCI clocks, nominal 3.3V
ITP Enable Latched Input/Free Running PCI clock output.
ITP_Enable Selects the functionality of the CPU_ITP/SRC output as follows:
I/O
1 = CPU_ITP output
0 = SRC output
Real-time input pin that controls PCIEXCLK outputs that are selected through
IN
the SMBus. 1 = selected outputs are disabled, 0 = selected outputs are
enabled.
Latched select input for 12/48MHz output. 1=12MHz, 0=48MHz. 12/48MHz
I/O
clock output.
PWR Power supply, nominal 3.3V
3.3V tolerant input for CPU frequency selection. Low voltage threshold inputs,
I/O
see input electrical characteristics for Vil_FS and Vih_FS values. / 48.00MHz
USB clock
PWR Ground pin.
True clock of low power differential pair for 96.00MHz DOT clock. No 50ohm
OUT
to GND needed. No Rs needed.
Complementary clock of low power differential pair for 96.00MHz DOT clock.
OUT
No 50ohm resistor to GND needed. No Rs needed.
3.3V tolerant input for CPU frequency selection. Refer to input electrical
IN
characteristics for Vil_FS and Vih_FS values.
PWR Ground pin for the SATA outputs
True clock of differential SATA pair. / True clock of differential PCI-Express pair
OUT - selectable by FS(4:3) ; both are 0.8V differential push pull outputs with
integrated 33ohm series resistor.
Complementary clock of differential SATA pair. / Complementary clock of
OUT differential PCI-Express pair - selectable by FS(4:3); both are 0.8V differential
push pull outputs with integrated 33ohm series resistor.
PWR Supply for SATA clocks, 3.3V nominal
True clock of 0.8V differential push-pull PCI_Express pair with integrated
OUT
33ohm series resistor
Complementary clock of 0.8V differential push-pull PCI_Express pair with
OUT
integrated 33ohm series resistor
True clock of 0.8V differential push-pull PCI_Express pair with integrated
OUT
33ohm series resistor
Complementary clock of 0.8V differential push-pull PCI_Express pair with
OUT
integrated 33ohm series resistor
1561C — 08/24/11
4
5
6
7
8
PEREQ2#
**FS4/PCICLK0_2x
GND
VDDPCI
**ITP_EN/PCICLK_F0_2x
9
10
11
12
13
14
15
16
17
18
PEREQ3#
*SEL12_48#/12_48MHz_2x
VDD
FSLA/USB48_2x
GND
DOTT_96MHzLR
DOTC_96MHzLR
FSLB
GNDSATA
SATAT_LR/PCIeT_LR3
19
20
21
22
23
24
SATAC_LR/PCIeC_LR3
VDDSATA
PCIeT_LR0
PCIeC_LR0
PCIeT_LR1
PCIeC_LR1
IDT
®
Low Power Clock for Intel Atom
®
-Based Systems
3
9LPRS436C
Low Power Clock for Intel Atom
®
-Based Systems
Pin Description (Continued)
25
26
27
GND
VDDPCIEX
CPUITPC_LR2/PCIeC_LR2
PWR
PWR
OUT
Ground pin.
Power supply for PCI Express clocks, nominal 3.3V
Complementary clock of differential pair CPU output. / Complementary clock of
differential PCIEX pair. These are 0.8V push pull outputs. No external 50ohm
resistor to GND or 33ohm series resistor needed.
True clock of differential pair CPU output. / True clock of differential PCIEX
pair. These are 0.8V push pull outputs. No external 50ohm resistor to GND or
33ohm series resistor needed.
Complementary clock of differential pair 0.8V push-pull CPU outputs with
integrated 33ohm series resistor.
True clock of differential pair 0.8V push-pull CPU outputs with integrated
33ohm series resistor.
Supply for CPU clocks, 3.3V nominal
Complementary clock of differential pair 0.8V push-pull CPU outputs with
integrated 33ohm series resistor.
True clock of differential pair 0.8V push-pull CPU outputs with integrated
33ohm series resistor.
Ground pin.
Clock pin of SMBus circuitry, 5V tolerant.
Data pin for SMBus circuitry, 5V tolerant.
Stops CPU0 clock when enabled.
Stops all PCICLKs at logic 0 level, when low. Free running PCICLKs are not
effected by this input.
Crystal output, Nominally 25.00MHz.
Crystal input, Nominally 25.00MHz.
Ground pin.
25MHz clock output, 3.3V
Supply for suspend mode, powers 25MHz PLL, 25M output and XTAL
oscillator. 3.3V Nominal
This active high 3.3V LVTTL input is a level sensitive strobe used to determine
when latch inputs are valid and are ready to be sampled / Asynchronous active
low input pin that stops all outputs except free running 25Mhz
Power for 14.31818MHz PLL and REF output, nominal 3.3V.
2x strength 14.318 MHz reference clock./ 3.3V tolerant input for CPU frequency
selection. Refer to input electrical characteristics for Vil_FS and Vih_FS
values.
Ground pin.
Ground pin.
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
CPUITPT_LR2/PCIeT_LR2
CPUC_LR1
CPUT_LR1
VDDCPU
CPUC_LR0
CPUT_LR0
GND
SCLK
SDATA
CPU_STOP#
PCI&PCIEX_STOP#
X2_25
X1_25
GND
25MHz
VDDSUSP
OUT
OUT
OUT
PWR
OUT
OUT
PWR
IN
I/O
IN
IN
OUT
IN
PWR
OUT
PWR
44
45
46
47
48
Vtt_PwrGd/WOL_STOP#
VDD14
REF0_2x/FSLC
GND
GND
IN
PWR
I/O
PWR
PWR
IDT
®
Low Power Clock for Intel Atom
®
-Based Systems
1561C — 08/24/11
4
9LPRS436C
Low Power Clock for Intel Atom
®
-Based Systems
General Description
The
9LPRS436C
is a low power CK505-compatible clock targeted at Intel-based Netbooks and Nettops. This clock synthesizer
provides a single chip solution for systems using the Intel NM10 chipset paired with the Intel N450/D410/D510 Atom
®
CPUs. The
9LPRS436C
is driven with a 25MHz crystal.
Block Diagram
25M
NonSS
PLL
14.318M
NonSS
PLL
12.288M
CPU
25M
XTAL
SS PLL
PCI
PCIe/
SATA
75M/
100M
NonSS
PLL
DOT96
48MHz
12_48MHz
Series Resistors for Single Ended Outputs
Number of
Loads
to Drive
1
2
Notes:
1. Preferred drive strengths using CK505 clock sources. Transmission lines to load do not share
series resistors.
2. Desktop/Mobile Platforms with Zo = 50/55 ohms use the first resistor value.
3. Systems with Zo = 60 ohms use the resistor values in brackets [ ].
Match Point for N & P
Voltage / Current (mA)
0.56 / 33 (17
Ω
)
0.92 / 66 (14
Ω
)
Number of Loads Actually Driven.
1 Load
Rs=
33
Ω
[39
Ω
]
39
Ω
[43
Ω
]
2 Loads
Rs=
-
22
Ω
[27
Ω
]
3 Loads
Rs=
-
-
D.C.Drive Strength
IDT
®
Low Power Clock for Intel Atom
®
-Based Systems
1561C — 08/24/11
5
