4 Pin Configuration and Functions

Figure 4-1 135-Pin fcBGA, 0.8mm BGA Pin Pitch (Top View)

Table 4-1 Pin Functions

PIN		TYPE	INTERNAL PULL-UP/ PULL-DOWN	DESCRIPTION
NAME	NO.	TYPE	INTERNAL PULL-UP/ PULL-DOWN	DESCRIPTION
HIGH SPEED DIFFERENTIAL I/Os
RX0P	C15	Input	None	Inverting and non-inverting differential inputs to the equalizer. An on-chip 100Ω termination resistor connects RXP to RXN. These inputs are AC coupled on-chip with physical 220nF capacitors.
RX0N	B15	Input	None
RX1P	B13	Input	None	Inverting and non-inverting differential inputs to the equalizer. An on-chip 100Ω termination resistor connects RXP to RXN. These inputs are AC coupled on-chip with physical 220nF capacitors.
RX1N	A13	Input	None
RX2P	B11	Input	None	Inverting and non-inverting differential inputs to the equalizer. An on-chip 100Ω termination resistor connects RXP to RXN. These inputs are AC coupled on-chip with physical 220nF capacitors.
RX2N	A11	Input	None
RX3P	B9	Input	None	Inverting and non-inverting differential inputs to the equalizer. An on-chip 100Ω termination resistor connects RXP to RXN. These inputs are AC coupled on-chip with physical 220nF capacitors.
RX3N	A9	Input	None
RX4P	B7	Input	None	Inverting and non-inverting differential inputs to the equalizer. An on-chip 100Ω termination resistor connects RXP to RXN. These inputs are AC coupled on-chip with physical 220nF capacitors.
RX4N	A7	Input	None
RX5P	B5	Input	None	Inverting and non-inverting differential inputs to the equalizer. An on-chip 100Ω termination resistor connects RXP to RXN. These inputs are AC coupled on-chip with physical 220nF capacitors.
RX5N	A5	Input	None
RX6P	B3	Input	None	Inverting and non-inverting differential inputs to the equalizer. An on-chip 100Ω termination resistor connects RXP to RXN. These inputs are AC coupled on-chip with physical 220nF capacitors.
RX6N	A3	Input	None
RX7P	C1	Input	None	Inverting and non-inverting differential inputs to the equalizer. An on-chip 100Ω termination resistor connects RXP to RXN. These inputs are AC coupled on-chip with physical 220nF capacitors.
RX7N	B1	Input	None
TX0P	G15	Output	None	Inverting and non-inverting 50Ω driver outputs. These outputs are AC coupled on-chip with physical 220nF capacitors.
TX0N	H15	Output	None
TX1P	H13	Output	None	Inverting and non-inverting 50Ω driver outputs. These outputs are AC coupled on-chip with physical 220nF capacitors.
TX1N	J13	Output	None
TX2P	H11	Output	None	Inverting and non-inverting 50Ω driver outputs. These outputs are AC coupled on-chip with physical 220nF capacitors.
TX2N	J11	Output	None
TX3P	H9	Output	None	Inverting and non-inverting 50Ω driver outputs. These outputs are AC coupled on-chip with physical 220nF capacitors.
TX3N	J9	Output	None
TX4P	H7	Output	None	Inverting and non-inverting 50Ω driver outputs. These outputs are AC coupled on-chip with physical 220nF capacitors.
TX4N	J7	Output	None
TX5P	H5	Output	None	Inverting and non-inverting 50Ω driver outputs. These outputs are AC coupled on-chip with physical 220nF capacitors.
TX5N	J5	Output	None
TX6P	H3	Output	None	Inverting and non-inverting 50Ω driver outputs. These outputs are AC coupled on-chip with physical 220nF capacitors.
TX6N	J3	Output	None
TX7P	G1	Output	None	Inverting and non-inverting 50Ω driver outputs. These outputs are AC coupled on-chip with physical 220nF capacitors.
TX7N	H1	Output	None
CALIBRATION CLOCK PINS
CAL_CLK_IN	E1	Input, 2.5V CMOS	Weak pull-down	25MHz (±100 PPM) 2.5V single-ended clock from external oscillator. No stringent phase noise or jitter requirements on this clock. Used to calibrate VCO frequency range. This clock is not used to recover data.
CAL_CLK_OUT	E15	Output, 2.5V CMOS	None	2.5V buffered replica of calibration clock input (pin E1) for connecting multiple devices in a daisy-chained fashion.
SYSTEM MANAGEMENT BUS (SMBUS) PINS
ADDR0	D13	Input, 4-level	None	4-level strap pins used to set the SMBus address of the device. The pin state is read on power-up. The multi-level nature of these pins allows for 16 unique device addresses. The four strap options include: 0: 1kΩ to GND R: 10kΩ to GND F: Float 1: 1kΩ to VDD Refer to Section 6.4.4 for more information.
ADDR1	E13	Input, 4-level	None
EN_SMB	E3	Input, 4-level	None	Four-level 2.5V input used to select between SMBus controller mode (float) and SMBus target mode (high). The four defined levels are: 0: 1kΩ to GND - RESERVED, TI test mode . R: 10kΩ to GND - RESERVED, TI test mode F: Float - SMBus Controller Mode 1: 1kΩ to VDD - SMBus Target Mode
SDA	E12	I/O, 3.3V LVCMOS, Open Drain	None	SMBus data input and open drain output. External 2kΩ to 5kΩ pull-up resistor is required as per SMBus interface standard. This pin is 3.3V LVCMOS tolerant.
SDC	F12	I/O, 3.3V LVCMOS, Open Drain	None	SMBus clock input and open drain clock output. External 2kΩ to 5kΩ pull-up resistor is required as per SMBus interface standard. This pin is 3.3V LVCMOS tolerant.
SMBUS MASTER MODE PINS
READ_EN_N	F13	Input, 3.3V LVCMOS	Weak pull-up	SMBus Controller Mode (EN_SMB=Float): When asserted low, initiates the SMBus controller mode EEPROM read function. Once EEPROM read is complete (indicated by assertion of ALL_DONE_N low), this pin can be held low for normal device operation. This pin is 3.3V tolerant. SMBus Target Mode (EN_SMB=1): When asserted low, this causes the device to be held in reset (I²C state machine reset and register reset). This pin should be pulled high or left floating for normal operation in SMBus Target Mode. This pin is 3.3V tolerant.
ALL_DONE_N	D3	Output, LVCMOS	None	Indicates the completion of a valid EEPROM register load operation when in SMBus Controller Mode (EN_SMB=Float): High = External EEPROM load failed or incomplete Low = External EEPROM load successful and complete When in SMBus target mode (EN_SMB=1), this output reflects the status of READ_EN_N input.
MISCELLANEOUS PINS
INT_N	F3	Output, LVCMOS, Open-Drain	None	Open-drain 3.3V tolerant active-low interrupt output. It pulls low when an interrupt occurs. The events which trigger an interrupt are programmable through SMBus registers. This pin can be connected in a wired-OR fashion with other device's interrupt pin. A single pull-up resistor in the 2kΩ to 5kΩ range is adequate for the entire INT_N net.
TEST0	E2	Input, LVCMOS	Weak pull-up	Reserved TI test pins. During normal (non-test-mode) operation, these pins are configured as inputs and therefore they are not affected by the presence of a signal. These pins may be left floating, tied to GND, or connected to a 2.5V (max) output.
TEST1	E14	Input, LVCMOS	Weak pull-up
TEST4	F4	Input, LVCMOS	Weak pull-up	Reserved TI test pin. During normal (non-test-mode) operation, this pin is configured as an input and therefore is not affected by the presence of a signal. This pin should be tied to GND or left floating.
TEST5	E4	Input, LVCMOS	Weak pull-up	Reserved TI test pin. During normal (non-test-mode) operation, this pin is configured as an input and therefore is not affected by the presence of a signal. This pin may be left floating, tied to GND, or connected to a 2.5V (max) output.
TEST6	D4	Input, LVCMOS	Weak pull-up
TEST7	D12	Input, LVCMOS	Weak pull-up
POWER
VDD	D6, D8, D10, E5, E6, E7, E8, E9, E10, F6, F8, F10	Power	None	Power supply, VDD = 2.5V ±5%. TI recommends connecting at least six de-coupling capacitors between the Retimer’s VDD plane and GND as close to the Retimer as possible. For example, four 0.1μF capacitors and two 1μF capacitors directly beneath the device or as close to the VDD pins as possible. The VDD pins on this device should be connected through a low-resistance path to the board VDD plane.
GND	A1, A2, A4, A6, A8, A10, A12, A14, A15, B2, B4, B6, B8, B10, B12, B14, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, D1, D2, D5, D7, D9, D11, D14, D15, E11, F1, F2, F5, F7, F9, F11, F14, F15, G2, G3, G4, G5, G6, G7, G8, G9, G10, G11, G12, G13, G14, H2, H4, H6, H8, H10, H12, H14, J1, J2, J4, J6, J8, J10, J12, J14, J15	Power	None	Ground reference. The GND pins on this device should be connected through a low-resistance path to the board GND plane.