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LTC2979 Datasheet(PDF) 6 Page - Linear Technology

Part No. LTC2979
Description  16-Channel PMBus Low-Voltage Power System Manager
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2979 Datasheet(HTML) 6 Page - Linear Technology

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LTC2979
6
2979f
For more information www.linear.com/LTC2979
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C. VDD33 = 3.3V, VIN_SNS = 12V, VDD25 and REF pins floating, unless
otherwise indicated. (Notes 2, 3)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
tSP
Pulse Width of Spike Suppressed
FAULTB
zn, CONTROLn Pins Only
10
µs
SDA, SCL Pins Only
98
ns
tFAULT_MIN
Minimum Low Pulse Width for
Externally Generated Faults
110
ms
tRESETB
Pulse Width to Assert Reset
VWDI/RESETB ≤ 1.5V
l
300
µs
tWDI
Pulse Width to Reset Watchdog Timer VWDI/RESETB ≤ 1.5V
l
0.3
200
µs
fWDI
Watchdog Interrupt Input Frequency
l
1
MHz
CIN
Digital Input Capacitance
10
pF
Digital Input SHARE_CLK
VIH
High Level Input Voltage
l
1.6
V
VIL
Low Level Input Voltage
l
0.8
V
fSHARE_CLK_IN Input Frequency Operating Range
l
90
110
kHz
tLOW
Assertion Low Time
VSHARE_CLK < 0.8V
l
0.825
1.1
µs
tRISE
Rise Time
VSHARE_CLK < 0.8V to VSHARE_CLK > 1.6V
l
450
ns
ILEAK
Input Leakage Current
0V ≤ VSHARE_CLK ≤ VDD33 + 0.3V
l
±1
µA
CIN
Input Capacitance
10
pF
Digital Outputs SDA, ALERTB, PWRGD, SHARE_CLK, FAULTB00, FAULTB01, FAULTB10, FAULTB11
VOL
Digital Output Low Voltage
ISINK = 3mA
l
0.4
V
fSHARE_CLK_OUT Output Frequency Operating Range
5.49k Pull-Up to VDD33
l
90
100
110
kHz
Digital Inputs ASEL0,ASEL1
VIH
Input High Threshold Voltage
l
VDD33 – 0.5
V
VIL
Input Low Threshold Voltage
l
0.5
V
IIH, IIL
High, Low Input Current
ASEL[1:0] = 0, VDD33
l
±95
µA
IHIZ
Hi-Z Input Current
l
±24
µA
CIN
Input Capacitance
10
pF
Serial Bus Timing Characteristics
fSCL
Serial Clock Frequency (Note 13)
l
10
400
kHz
tLOW
Serial Clock Low Period (Note 13)
l
1.3
µs
tHIGH
Serial Clock High Period (Note 13)
l
0.6
µs
tBUF
Bus Free Time Between Stop and Start
(Note 13)
l
1.3
µs
tHD,STA
Start Condition Hold Time (Note 13)
l
600
ns
tSU,STA
Start Condition Setup Time (Note 13)
l
600
ns
tSU,STO
Stop Condition Setup Time (Note 13)
l
600
ns
tHD,DAT
Data Hold Time (LTC2979 Receiving
Data) (Note 13)
l
0
ns
Data Hold Time (LTC2979 Transmitting
Data) (Note 13)
l
300
900
ns
tSU,DAT
Data Setup Time (Note 13)
l
100
ns


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