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DS125RT410SQ Datasheet(PDF) 4 Page - Texas Instruments

Part # DS125RT410SQ
Description  Low-Power Multi-Rate Quad Channel Retimer
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DS125RT410SQ Datasheet(HTML) 4 Page - Texas Instruments

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DS125RT410
SNLS459A – APRIL 2013 – REVISED OCTOBER 2015
www.ti.com
Pin Functions (continued)
PIN
I/O, TYPE (1)
DESCRIPTION
NAME
NO.
LOOP FILTER CONNECTION PINS
LPF_CP_0
47
Loop filter connection
I/O, analog
LPF_REF_0
48
Place a 22 nF ± 10% capacitor between LPF_CP_0 and LPF_REF_0
LPF_CP_1
38
Loop filter connection
I/O, analog
LPF_REF_1
37
Place a 22 nF ± 10% capacitor between LPF_CP_1 and LPF_REF_1
LPF_CP_2
23
Loop filter connection
I/O, analog
LPF_REF_2
24
Place a 22 nF ± 10% capacitor between LPF_CP_2 and LPF_REF_2
LPF_CP_3
14
Loop filter connection
I/O, analog
LPF_REF_3
13
Place a 22 nF ± 10% capacitor between LPF_CP_3 and LPF_REF_3
REFERENCE CLOCK I/O
Input is 2.5 V, 25 MHz ± 100-ppm reference clock from external oscillator
REFCLK_IN
19
I, 2.5-V analog
No stringent phase noise requirement
O, 2.5-V
Output is 2.5 V, buffered replica of reference clock input for connecting multiple DS125RT410
REFCLK_OUT
42
analog
devices on a board
LOCK INDICATOR PINS
LOCK0
45
LOCK1
40
O, 2.5-V
Output is 2.5 V, the pin is high when CDR lock is attained on the corresponding channel.
LOCK2
21
LVCMOS
These pins are shared with SMBus address strap input functions read at start-up.
LOCK3
16
SMBus MASTER MODE PINS
O, 2.5-V
Output is 2.5 V, the pin goes low to indicate that the SMBus master EEPROM read has been
ALL_DONE
41
LVCMOS
completed.
I, 2.5-V
Input is 2.5 V, a transition from high to low starts the load from the external EEPROM. The
READ_EN
44
LVCMOS
READ_EN pin must be tied low when in SMBus slave mode.
INTERRUPT OUTPUT
Used to signal horizontal or vertical eye opening out of tolerance, loss of signal detect, or
O, 3.3-V
CDR unlock.
INT
43
LVCMOS,
External 2-k
Ω to 5-kΩ pullup resistor is required.
Open Drain
Pin is 3.3-V LVCMOS tolerant.
SERIAL MANAGEMENT BUS (SMBus) INTERFACE
Input is 2.5 V, selects SMBus master mode or SMBus slave mode.
EN_SMB = High for slave mode
EN_SMB
20
I, 2.5-V analog
EN_SMB = Float for master mode
Tie READ_EN pin low for SMBus slave mode. See Table 4.
I/O, 3.3-V
Data Input and Open Drain Output
SDA
18
LVCMOS,
External 2-k
Ω to 5-kΩ pullup resistor is required.
Open Drain
Pin is 3.3-V LVCMOS tolerant.
I/O, 3.3-V
Clock Input and Open Drain Clock Output
SDC
17
LVCMOS,
External 2-k
Ω to 5-kΩ pullup resistor is required.
Open Drain
Pin is 3.3-V LVCMOS tolerant.
Input is 2.5 V, the ADDR_[3:0] pins set the SMBus address for the retimer.
ADDR_0
45
These pins are strap inputs. Their state is read on power-up to set the SMBus address in
ADDR_1
40
I, 2.5-V
SMBus control mode.
ADDR_2
21
LVCMOS
High = 1 k
Ω to VDD, Low = 1 kΩ to GND
ADDR_3
16
These pins are shared with the lock indicator functions. See Table 1.
POWER
3, 6, 7,
VDD
10, 15,
Power
VDD = 2.5 V ± 5%
46
22, 27,
GND
30, 31,
Power
Ground reference.
34, 39
Ground reference. The exposed pad at the center of the package must be connected to
DAP
PAD
Power
ground plane of the board with at least 4 vias to lower the ground impedance and improve
the thermal performance of the package.
4
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Product Folder Links: DS125RT410


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