DS125BR401SQ Datasheet, PDF (7/52 Pages) Texas Instruments – Low-Power 12.5-Gbps 4-Lane Repeater With Input Equalization and Output De-Emphasis

DS125BR401
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Electrical Characteristics (continued)
Parameter
I_ih
Input High Current (PWDN pin)
Input High Current with internal
resistors
(4–level input pin)
I_il
Input Low Current (PWDN pin)
Input Low Current with internal
resistors
(4–level input pin)
CML Receiver Inputs (IN_n+, IN_n-)
RL_rx-diff
RX Differential return loss
RL_rx-cm
Z_rx-dc
Z_rx-diff-dc
V_rx-diff-dc
RX Common mode return loss
RX DC common mode impedance
RX DC differntial mode impedance
Differential RX peak to peak voltage
(VID)
V_{rx-signal-det-diff-pp} Signal detect assert level for active
data signal
V_{rx-idle-det-diff-pp}
Signal detect de-assert level for
electrical idle
High Speed Outputs
V_tx-diff-pp
Output Voltage Differential Swing
V_{tx-de-ratio_3.5}
TX de-emphasis ratio
V_{tx-de-ratio_6}
TX de-emphasis ratio
T_TX-HF-DJ-DD
T_TX-HF-DJ-DD
T_TX-RISE-FALL
T_RF-MISMATCH
RL_TX-DIFF
RL_TX-CM
Z_TX-DIFF-DC
V_TX-CM-AC-PP
I_TX-SHORT
TX Dj > 1.5 MHz
TX RMS jitter < 1.5 MHz
Transmitter rise/fall time
Transmitter rise/fall mismatch
TX Differential return loss
TX Common mode return loss
DC differential TX impedance
TX AC common mode voltage
Transmitter short circuit current limit
V_TX-CM-DC-
ACTIVE-IDLE-DELTA
V_{TX-CM-DC-LINE-}
DELTA
Absolute delta of DC common mode
voltage during L0 and electrical idle
Absolute delta of DC common mode
voltgae between TX+ and TX-
Test Conditions
VIN = 3.6 V,
LVCMOS = 3.6 V
VIN = 3.6 V,
LVCMOS = 0 V
0.05 - 7.5 GHz
7.5 - 15 GHz
0.05 - 5 GHz
Tested at VDD = 2.5 V
Tested at VDD = 2.5 V
Tested at pins
SD_TH = F (float),
0101 pattern at 8 Gbps
SD_TH = F (float),
0101 pattern at 8 Gbps
Differential measurement with
Out_n+ and OUT_n-,
terminated by 50Ω to GND,
AC-Coupled, VID = 1.0 Vp-p,
DEM0 = 1, DEM1 = 0⁽¹⁾
VOD = 1.0 Vp-p,
DEM0 = 0, DEM1 = R,
Gen 1 & 2 modes only
VOD = 1.0 Vp-p,
DEM0 = R, DEM1 = R,
Gen 1 & 2 modes only
20% to 80% of differential output
voltage
20% to 80% of differential output
voltage
0.05 - 7.5 GHz
7.5 - 15 GHz
0.05 - 5 GHz
VOD = 1.0 Vp-p,
DEM0 = 1, DEM1 = 0
Total current the transmitter can
supply when shorted to VDD or
GND
SNLS419C – JULY 2012 – REVISED APRIL 2013
Min
Typ
Max
Unit
-15
+15
uA
+20
+150
uA
-15
+15
uA
-160
-40
uA
-15
dB
-5
dB
-10
dB
40
50
60
Ω
80
100
120
Ω
0.6
1.0
1.2
V
180
mVp-p
110
mVp-p
0.8
1.0
1.2
mVp-p
−3.5
dB
−6
dB
0.15
UI
3.0
ps RMS
35
45
ps
0.01
0.1
UI
-15
dB
-5
dB
-10
dB
100
Ω
100
mVp-p
20
mA
100
mV
25
mV
(1) In PCIe GEN3 mode, the output VOD level is not fixed. It will be adjusted automatically based on the VID input amplitude level. The
output VOD level set by DEMA/B[1:0] in this MODE is dependent on the VID level and the frequency content. The DS125BR401
repeater is designed to be transparent in this MODE, so the TX-FIR (de-emphasis) is passed to the RX to support the handshake
negotiation link training.
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