Datasheet
DS32EL0421, DS32ELX0421
www.ti.com
SNLS282F –MAY 2008–REVISED APRIL 2013
SMBus Timing Specifications
Over recommended operating supply and temperature ranges unless otherwise specified.
(1) (2)
Symbol Parameter Conditions Min Typ Max Units
t
SMB
Bus Operating Frequency 10 100 kHz
t
BUF
Bus Free Time between Stop and Start Condition 4.7 μs
t
HD:STA
Hold time after (repeated) start condition. After this 4.0 μs
period, the first clock is generated.
t
SU:STA
Repeated Start Condition Setup Time 4.7 μs
t
SU:STO
Stop Condition Setup Time 4.0 μs
t
HD:DAT
Data Hold Time 300 ns
t
SU:DAT
Data Setup Time 250 ns
t
LOW
Clock Low Time 4.7 μs
t
HIGH
Clock High Time 4.0 50 μs
t
F
Clock/Data Fall Time 20% to 80% 300 ns
t
R
Clock/Data Rise Time 1000 ns
t
SU:CS
SMB_CS Setup Time 30 ns
t
POR
Time in which the device must be operation after See
(3)
500 ms
power on
(1) The Electrical Characteristics tables list ensured specifications under the listed Recommended Operating Conditions except as
otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and
are not ensured.
(2) Typical values represent most likely parametric norms for V
CC
= +3.3V and T
A
= +25°C, and at the Recommended Operation Conditions
at the time of product characterization and are not ensured.
(3) Parameter is ensured by characterization and is not tested at production.
LVDS Electrical Specifications
Over recommended operating supply and temperature ranges unless otherwise specified.
(1) (2) (3)
Symbol Parameter Conditions Min Typ Max Units
V
TH
Differential Input High Threshold +100 mV
0.05V < V
LVCM
< V
DD25
– 0.05V
V
TL
Differential Input Low Threshold -100 mV
V
LVCM
LVDS Input Common Mode Voltage 0.05 V
DD25
– V
0.05
V
LVOS
LVDS Input Loss of Signal LVDS input loss of signal level. 20 mV
P-P
See
(4)
R
LVIN
Input Impedance Internal LVDS input termination
85 100 115 Ω
between differential pairs.
(1) The Electrical Characteristics tables list ensured specifications under the listed Recommended Operating Conditions except as
otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and
are not ensured.
(2) Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground
except V
OD
and ΔV
OD
.
(3) Typical values represent most likely parametric norms for V
CC
= +3.3V and T
A
= +25°C, and at the Recommended Operation Conditions
at the time of product characterization and are not ensured.
(4) If input LVDS signal is below 20mV
P-P
, loss of signal (LOS) is detected. The device will flag a valid input signal if the signal level is
above 100mV
P-P
LVDS Timing Specifications
Over recommended operating supply and temperature ranges unless otherwise specified.
(1) (2)
Symbol Parameter Conditions Min Typ Max Units
f Input DDR Clock (TxCLKIN) Frequency Range 125 312.5 MHz
t
CIP
TxCLKIN Period See Figure 3 3.2 2T 8 ns
(1) The Electrical Characteristics tables list ensured specifications under the listed Recommended Operating Conditions except as
otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and
are not ensured.
(2) Typical values represent most likely parametric norms for V
CC
= +3.3V and T
A
= +25°C, and at the Recommended Operation Conditions
at the time of product characterization and are not ensured.
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