LTC6820 Ver la hoja de datos (PDF) - Linear Technology
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LTC6820 Datasheet PDF : 28 Pages
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LTC6820
Electrical Characteristics
of the time if MSTR = 0. See Applications Information section for more
detailed information.
Note 5: The IO supply pin, VDDS, provides power for the SPI inputs and
outputs, including the EN pin. If the inputs are near 0V or VDDS (to avoid
static current in input buffers) and the outputs are not sourcing current,
then IDDS includes only leakage current.
Note 6: The LTC6820 is guaranteed to meet specifications with RBIAS
resistor values ranging from 2k to 20k, with 1% or better tolerance. Those
resistor values correspond to a typical IB that can range from 0.1mA
(for 20k) to 1mA (for 2k).
Note 7: These timing specifications are dependent on the delay through
the cable, and include allowances for 50ns of delay each direction. 50ns
corresponds to 10m of CAT-5 cable (which has a velocity of propagation
of 66% the speed of light). Use of longer cables would require derating
these specs by the amount of additional delay.
Note 8: These specifications do not include rise or fall time. While fall
time (typically 5ns due to the internal pull-down transistor) is not a
concern, rising-edge transition time tRISE is dependent on the pull-up
resistance and load capacitance. In particular, t12 and t14 require tRISE
< 110ns (if SLOW = 0) for the slave’s setup and hold times. Therefore,
the recommended time constant is 50ns or less. For example, if the
total capacitance on the data pin is 25pF (including self capacitance
CI/O of 10pF), the required pull-up resistor value is RPU ≤ 2kΩ. If these
requirements can’t be met, use SLOW = 1.
Note 9: Guaranteed by design. Not tested in production.
Typical Performance Characteristics VDD = VDDS, unless otherwise noted.
Supply Current (READY/ACTIVE)
vs Clock Frequency
7
6 VDD = 5V, IB = 1mA
5
VDD = 3V, IB = 1mA
4
3
VDD = 5V, IB = 0.1mA
2
MSTR = 1
1
0 200
VDD = 3V, IB = 0.1mA
400 600 800
FREQUENCY (kHz)
1000
6820 G01
Supply Current (IDLE)
vs Supply Voltage
3.0
2.5
2.0
SLAVE (MSTR = 0)
1.5
1.0
MASTER (MSTR = 1)
0.5
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
6820 G04
Supply Current (READY)
vs Temperature
5.3
IB = 1mA
5.2
VDD = 5V
5.1
VDD = 3V
5.0
4.9
4.8
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
6820 G02
Supply Current (IDLE)
vs Temperature
3.0
VDD = 5V
2.5
2.0
SLAVE (MSTR = 0)
1.5
1.0
MASTER (MSTR = 1)
0.5
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
6820 G05
Input Voltage Threshold
(Except EN Pin)
vs Supply Voltage (VDD or VDDS)
4.0
3.5
ONLY
3.0 SPI PINS
2.5
VIH
2.0
HIGH
LOW
1.5
1.0
VIL
0.5
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
6820 G03
Output Resistance vs Supply
Voltage (VOH/VOL)
100
80
OUTPUT
SOURCING 2mA CURRENT
60
40
20
0
1.5
OUTPUT SINKING 3.3mA CURRENT
2.5
3.5
4.5
SUPPLY VOLTAGE (V)
5.5
6820 G19
6820f
5
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