LTC2978 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2978' PDF : 64 Pages View PDF
LTC2978
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C. VPWR = VIN_SNS = 12V; VDD33, VDD25, REFP and REFM pins floating,
unless otherwise indicated. CVDD33 = 100nF, CVDD25 = 100nF and CREF = 100nF.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
tRESETB
Pulse Width to Assert Reset
tWDI
Pulse Width to Reset Watchdog Timer
fWDI
Watchdog Interrupt Input Frequency
CIN
Digital Input Capacitance
Digital Input SHARE_CLK
VWDI/RESETB ≤ 1.5V
VWDI/RESETB ≤ 1.5V
l 300
µs
l 0.3
200
µs
l
1
MHz
10
pF
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
fSHARE_CLK_OUT Output Frequency Operating Range
Digital Inputs ASEL0,ASEL1
ISINK = 3mA
5.49kΩ Pull-Up to VDD33
l
0.4
V
l
90
100
110
kHz
VIH
Input High Threshold Voltage
VIL
Input Low Threshold Voltage
IIH,IL
High, Low Input Current
IIH, Z
Hi-Z Input Current
CIN
Input Capacitance
Serial Bus Timing Characteristics
ASEL[1:0] = 0, VDD33
l VDD33 – 0.5
l
V
0.5
V
l
±95
µA
l
±24
µA
10
pF
fSCL
Serial Clock Frequency (Note 10)
tLOW
Serial Clock Low Period (Note 10)
tHIGH
Serial Clock High Period (Note 10)
tBUF
Bus Free Time Between Stop and Start
(Note 10)
l
10
l 1.3
l 0.6
l 1.3
400
kHz
µs
µs
µs
tHD,STA
tSU,STA
tSU,STO
tHD,DAT
Start Condition Hold Time (Note 10)
Start Condition Setup Time (Note 10)
Stop Condition Setup Time (Note 10)
Data Hold Time (LTC2978 Receiving
Data) (Note 10)
l 600
ns
l 600
ns
l 600
ns
l
0
ns
Data Hold Time (LTC2978 Transmitting
Data) (Note 10)
l 300
900
ns
tSU,DAT
tSP
Data Setup Time (Note 10)
Pulse Width of Spike Suppressed
(Note 10)
l 100
ns
98
ns
tTIMEOUT_BUS Time Allowed to Complete any PMBus Longer Timeout = 0
Command After Which Time SDA Will Longer Timeout = 1
Be Released and Command Terminated
l
25
35
ms
l
200
280
ms
2978fd
8
For more information www.linear.com/LTC2978
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