參數(shù)資料
型號: LM40
廠商: National Semiconductor Corporation
英文描述: Hardware Monitor with Dual Thermal Diodes and SensorPath Bus
中文描述: 硬件監(jiān)控雙熱二極管和SensorPath總線
文件頁數(shù): 6/27頁
文件大?。?/td> 369K
代理商: LM40
AC Electrical Characteristics
(Continued)
The following specification apply for V+ = +3.0 V
to +3.6 V
, unless otherwise specified.
Boldface limits apply for
T
A
= T
J
= T
MIN
=0C to T
MAX
=85C
; all other limits T
= T
= 25C. The SensorPath Characteristics conform to the SensorPath
specification revision 0.98. Please refer to that speciation for further details.
Symbol
t
r
Parameter
SWD rise time (Note 16)
Conditions
R
pull-up
=1.25 k
±
30%,
C
L
=400 pF
Typical
(Note 7)
Limits
(Note 8)
1000
Units
(Limits)
ns (max)
t
INACT
Minimum inactive time (bus at high level)
guaranteed by the slave before an attention
request
Master drive for Data Bit 0 write and for Data
Bit 0-1read
11
μs (min)
t
Mtr0
11.8
17.0
35.4
48.9
9.6
28.3
38.3
80
109
165
228
354
500
μs (min)
μs (max)
μs (min)
μs (max)
μs (max)
μs (min)
μs (max)
μs (min)
μs (max)
μs (min)
μs (max)
μs (min)
ms (max)
t
Mtr1
Master drive for Data Bit 1 write
t
SFEdet
t
SLout1
Time allowed for LM40 activity detection
LM40 drive for Data Bit 1 read by master
t
MtrS
Master drive for Start Bit
t
SLoutA
LM40 drive for Attention Request
t
RST
Master or LM40 drive for Reset
Maximum drive of SWD by an LM40, after the
power supply is raised above 3V
t
RST_MAX
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2:
All voltages are measured with respect to GND, unless otherwise noted.
Note 3:
When the input voltage (V
IN
) at any pin exceeds the power supplies (V
IN
<
GND or V
IN
>
V+), the current at that pin should be limited to 5 mA. Parasitic
components and/or ESD protection circuitry are shown below for the LM40’s pins. The nominal breakdown voltage of the zener is 6.5 V. SNP stands for snap-back
device.
L
www.national.com
6
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