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AMC7820 Datasheet, PDF (6/28 Pages) Texas Instruments – ANALOG MONITORING AND CONTROL
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TIMING CHARACTERISTICS
At –40°C to +85°C, +AVDD = +DVDD = +5V, VREF = +2.5V, +BVDD = +5V, unless otherwise noted.
PARAMETER
SYMBOL
MIN
SCLK Period
tSCK
30
SCLK HIGH or LOW Time
tWSCK
15
Rise Time
tR
Fall Time
tF
Enable Lead Time
tLEAD
15
Enable Lag Time
tLAG
15
Sequential Transfer Delay
tTD
30
Data Setup Time
tSU
10
Data Hold Time (inputs)
tHI
10
Slave Access Time
tA
Data Valid
tV
Data Hold Time (outputs)
tHO
0
Slave MISO Disable Time
tDIS
TIMING CHARACTERISTICS
At –40°C to +85°C, +AVDD = +DVDD = +5V, VREF = +2.5V, +BVDD = +3V, unless otherwise noted.
PARAMETER
SYMBOL
MIN
SCLK Period
tSCK
40
SCLK HIGH or LOW Time
tWSCK
20
Rise Time
tR
Fall Time
tF
Enable Lead Time
tLEAD
15
Enable Lag Time
tLAG
15
Sequential Transfer Delay
tTD
30
Data Setup Time
tSU
10
Data Hold Time (inputs)
tHI
10
Slave Access Time
tA
Data Valid
tV
Data Hold Time (outputs)
tHO
0
Slave MISO Disable Time
tDIS
MAX
30
30
15
10
15
MAX
30
30
15
15
15
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
TIMING DIAGRAM
SS
SCLK
MOSI
tLEAD
tSCK
tWSCK
tWSCK
tSU
tHI
Command
BIT 15 (MSB)
tF
Command
BIT 14 . . . 1
tR
Command
BIT 0 (LSB)
WRITE COMMAND FROM THE HOST
MISO Hi-Z
tA
WRITE OPERATION
SS
SCLK
MOSI
tLEAD
tSCK
tWSCK
tWSCK
tSU
tHI
Don’t
Care
Command
BIT 15 (MSB)
tF
Command
BIT 14 . . . 1
tR
Command
BIT 0 (LSB)
READ COMMAND FROM THE HOST
MISO Hi-Z
tA
READ OPERATION
tLAG
tTD
DATA IN
BIT 15 (MSB)
DATA IN
BIT 14 . . . 1
DATA IN
BIT 0 (LSB)
DATA WRITTEN INTO AMC7820’s REGISTERS
tV
DATA OUT
BIT 15 (MSB)
tHO
DATA OUT
BIT 14 . . . 1
tDIS
DATA OUT
BIT 0 (LSB)
Previous value of register N before writing operation. NOTE: If SS is HIGH,
MISO is in Hi-Z.
tLAG
tTD
Don’t
Care
tV
DATA OUT
BIT 15 (MSB)
tHO
DATA OUT
BIT 14 . . . 1
tDIS
DATA OUT
BIT 0 (LSB)
DATA READ FROM AMC7820’s REGISTERS
NOTE: If SS is HIGH,
MISO is in Hi-Z.
6
AMC7820
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SBAS231B
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