5.7 USB Electrical Characteristics
over operating free-air temperature and voltage range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
USB Gen 2 Differential Receiver (CRX1p/n, CRX2p/n, SSTX)
V
(RX-DIFF-PP)
Input differential peak-peak voltage
swing linear dynamic range
AC-coupled differential peak-to-peak
signal measured post CTLE through a
reference channel
1200 mVpp
V
(RX-DC-CM)
Common-mode voltage bias in the
receiver (DC)
0 V
V
RX_CM-INST
Max Instantaneous RX DC common
mode voltage change under all
operating conditions (OFF to ON,
Disabled to USB, etc…)
Measured at non-device side of AC
coupling capacitor with 200-kΩ load.
-300 500 mV
R
(RX-DIFF-DC)
Differential input impedance (DC) Present after a GEN2 device is detected. 72 90 120 Ω
R
(RX-CM-DC)
Receiver DC common mode
impedance
Present after a GEN2 device is detected. 18 30 Ω
Z
(RX-HIGH-IMP-DC-POS)
Common-mode input impedance with
termination disabled (DC)
Present when no GEN2 device is detected
on transmitter.
Measured over the range of 0 – 500 mV
with respect to GND.
25 kΩ
V
(SIGNAL-DET-DIFF-PP)
Input differential peak-to-peak signal
detect assert level
At 10 Gbps, no input loss, PRBS7 pattern 75 mV
V
(RX-IDLE-DET-DIFF-PP)
Input differential peak-to-peak signal
detect de-assert Level
At 10 Gbps, no input loss, PRBS7 pattern 55 mV
V
(RX-LFPS-DET-DIFF-PP)
Low frequency periodic signaling
(LFPS) detect threshold
Below the minimum is squelched 100 300 mV
V
(RX-CM-AC-P)
Peak RX AC common-mode voltage Measured at package pin 150 mV
C
(RX)
RX input capacitance to GND At 5 GHz; 1 pF
R
L(RX-DIFF)
Differential return Loss
50 MHz – 1.25 GHz at 85 Ω; -22 dB
5 GHz at 85 Ω; -20 dB
R
L(RX-CM)
Common-mode return loss 50 MHz – 5 GHz at 85 Ω; -12 dB
E
Q_SSTX15
SSTX->CTX1 Receiver equalization at
5 GHz
SSEQ1_SEL = 15; Gain at 5 GHz minus
Gain at 10 MHz;
13.6 dB
E
Q_RX15
CRX1 -> SSRX Receiver equalization
at 5 GHz
CEQ1_SEL = 15; Gain at 5 GHz minus
Gain at 10 MHz;
12.7 dB
C
AC-USB1
Required external AC capacitor on
SSTX
75 265 nF
C
AC-USB2
Optional external AC capacitor on
CRX1 and CRX2.
297 363 nF
USB Gen 2 Differential Transmitter (CTX1p/n, CTX2p/n, SSRX)
V
TX(DIFF-PP)
Transmitter dynamic differential
voltage swing range.
EQ15; VID = 1Vpp; LINR_L3 1200 mVpp
V
TX(RCV-DETECT)
Amount of voltage change allowed
during receiver detection
600 mV
V
TX-CM-INST-ONOFF
Max Instantaneous TX DC common
mode voltage change under operating
condition: OFF to ON, ON to OFF,
during Rx.Detect; Disconnect to U0,
U2/U3 to Disconnect.
Measured single-ended at non-device side
of AC coupling capacitor with 200-kΩ
load.
-500 800 mV
V
TX(CM-IDLE-DELTA)
Transmitter idle common-mode
voltage change while in U2/U3 and not
actively transmitting LFPS
–300 600 mV
V
TX(DC-CM)
Common-mode voltage bias in the
transmitter (DC)
0.5 0.76 1 V
V
TX(CM-AC-PP-ACTIVE)
Tx AC common-mode voltage active
Max mismatch from Txp + Txn for both
time and amplitude
100 mVpp
V
TX(IDLE-DIFF-AC-PP)
AC electrical idle differential peak-to-
peak output voltage
At package pins 0 10 mV
V
TX(CM-DC-ACTIVE-
IDLE-DELTA)
Absolute DC common-mode voltage
between U1 and U0
At package pin 200 mV
R
TX(DIFF)
Differential impedance of the driver 80 90 120 Ω
www.ti.com
TUSB1142
SLLSFL2 – APRIL 2022
Copyright © 2022 Texas Instruments Incorporated
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