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參數資料
| 型號： | LM79 |
| 文件頁數： | 9/31頁 |
| 文件大小： | 481K |
| 代理商： | LM79 |
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AC Electrical Characteristics
(Note 13) The following specifications apply for +4.25 V
DC
≤
V
CC
≤
+5.75 V
DC
unless otherwise specified.
Boldface limits apply for T
A
= T
J
= T
MIN
to T
MAX
;
all other limits T
A
= T
J
=
25C. (Continued)
Symbol
Parameter
Conditions
Typical
(Note 8)
Limits
(Note 9)
Units
(Limits)
SERIAL BUS TIMING CHARACTERISTICS
t
1
SCL (Clock) Period
t
2
Data In Setup Time to SCL High
t
3
Data Out Stable After SCL Low
t
4
SDA Low Setup Time to SCL Low (start)
t
5
SDA High Hold Time After SCL High (stop)
2.5
100
0
100
100
μs (min)
ns (min)
ns (min)
ns (min)
ns (min)
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 specific 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 specified
Note 3:
When the input voltage (V
) at any pin exceeds the power supplies (V
<
(GNDD or GNDA) or V
>
V
), the current at that pin should be limited to 5 mA.
The 20 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5 mA to four.
Note 4:
The maximum power dissipation must be derated at elevated temperatures and is dictated by T
J
max,
θ
JA
and the ambient temperature, T
A
. The maximum
allowable power dissipation at any temperature is P
D
= (T
J
maxT
A
)/
θ
JA
.
Note 5:
The human body model is a 100 pF capacitor discharged through a 1.5 k
resistor into each pin. The machine model is a 200 pF capacitor discharged
directly into each pin.
Note 6:
See the section titled “Surface Mount” found in any post 1986 National Semiconductor Linear Data Book for other methods of soldering surface mount
devices.
Note 7:
Each input and output is protected by a nominal 6.5V breakdown voltage zener diode to GND; as shown below, input voltage magnitude up to 0.3V above
V
CC
or 0.3V below GND will not damage the LM79. There are parasitic diodes that exist between the inputs and the power supply rails. Errors in theADC conversion
can occur if these diodes are forward biased by more than 50 mV. As an example, if V
CC
is 4.50 V
DC
, input voltage must be
≤
4.55 V
DC
, to ensure accurate
conversions.
DS100036-6
FIGURE 3. Serial Bus Timing Diagram
L
www.national.com
9
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