DS125MB203_15 Datasheet, PDF (8/54 Pages) Texas Instruments – Low-Power 12.5-Gbps Dual-Lane 2:1/1:2 Mux/Buffer

DS125MB203
SNLS432C – OCTOBER 2012 – REVISED DECEMBER 2015
7.5 Electrical Characteristics
See ⁽¹⁾⁽²⁾.
PARAMETER
TEST CONDITIONS
POWER
PD
Power dissipation
EQ enabled, VOD = 1 Vp-p, ^{VDD = 2.5-V supply}
RESET = 0
VIN = 3.3-V supply
LVCMOS / LVTTL DC SPECIFICATIONS
V_ih
High-level input
voltage
V_il
Low-level input
voltage
High-level output
V_oh
voltage (ALL_DONE I_oh = −4 mA
pin)
Low-level output
V_ol
voltage (ALL_DONE I_ol = 4 mA
pin)
Input-high current
(RESET pin)
VIN = 3.6 V,
LVCMOS = 3.6 V
I_ih
Input-high current with
internal resistors
(4–level input pin)
VIN = 3.6 V,
LVCMOS = 3.6 V
Input-low current
(RESET pin)
VIN = 3.6 V,
LVCMOS = 0 V
I_il
Input-low current with
internal resistors
(4–level input pin)
VIN = 3.6 V,
LVCMOS = 0 V
CML RECEIVER INPUTS (IN_n+, IN_n-)
RL_rx-diff
RX differential return ^{0.05 – 7.5 GHz}
loss
7.5 – 15 GHz
RLrx-cm
RX common-mode
return loss
0.05 – 5 GHz
Zrx-dc
RX DC common-
mode impedance
Tested at VDD = 2.5 V
Zrx-diff-dc
RX DC differential
mode impedance
Tested at VDD = 2.5 V
Vrx-diff-dc
Differential Rx peak to
peak voltage (VID)
Tested at pins
Vrx-signal-det-
diff-pp
Signal detect assert
level for active data
signal
0101 pattern at 8 Gbps
Vrx-idle-det-diff-
pp
Signal detect deassert
level for electrical idle
0101 pattern at 8 Gbps
HIGH SPEED OUTPUTS
V_tx-diff-pp
Output voltage
differential swing
Differential measurement with OUT_n+ and OUT_n-,
terminated by 50 Ω to GND,
AC-coupled, VID = 1.0 Vp-p,
DEM_x[1:0] = R, F⁽³⁾
V_{tx-de-ratio_3.5}
TX de-emphasis ratio
VOD = 1.0 Vp-p,
DEM_x[1:0] = R, F
MIN
2
0
2
–15
20
–15
–160
40
80
0.6
0.8
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TYP MAX UNIT
390
500
mW
515
685
mW
3.6
V
0.8
V
V
0.4
V
15
µA
150
µA
15
µA
–40
µA
–15
dB
–5
dB
–10
dB
50
60
Ω
100
120
Ω
1
1.2
V
180
mVp-p
110
mVp-p
1
1.2 Vp-p
–3.5
dB
(1) Typical values represent most likely parametric norms at VDD = 2.5 V, T_A = 25°C, and at the Recommended Operation Conditions at
the time of product characterization and are not ensured.
(2) The Electrical Characteristics tables list ensured specifications under the listed Recommended Operating Conditions except as
otherwise modified or specified by the Electrical Characteristics conditions, notes, or both. Typical specifications are estimations only
and are not ensured.
(3) In 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 DEM_x[1:0] in GEN3 mode is dependent on the VID level and the frequency content. The DS125MB203 repeater in
GEN3 mode is designed to be transparent, so the TX-FIR (de-emphasis) is passed to the RX to support the PCIe GEN3 handshake
negotiation link training.
8
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