lm74a-5-mda National Semiconductor Corporation, lm74a-5-mda Datasheet - Page 5

• Manufacturer Part Number: lm74a-5-mda
• Description: Spi/microwire 12-bit Plus Sign Temperature Sensor Lm74 In Die Form
• Manufacturer: National Semiconductor Corporation

t
t
t
t
t
t
t
1
2
3
4
5
6
7
Symbol
Serial Bus Digital Switching Characteristics
Unless otherwise noted, these specifications apply for V
LM74-3 MDA.(Note 5). Boldface limits apply for T
noted.
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating
the device beyond its rated operating conditions.
Note 2: When the input voltage (V
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 3: Human body model, 100 pF discharged through a 1.5 kΩ resistor. Machine model, 200 pF discharged directly into each pin.
Note 4: The life expectancy of the LM74A will be reduced when operating at elevated temperatures.
Note 5: All LM74A parts will function over the V
+140˚C, 0˚C to +150˚C and −40˚C to +150˚C include error induced by power supply variation of
Note 6: Typicals are at T
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: This specification is provided only to indicate how often temperature data is updated. The LM74A can be read at any time without regard to conversion state
(and will yield last conversion result). A conversion in progress will not be interrupted. The output shift register will be updated at the completion of the read and a
new conversion restarted.
Note 9: For best accuracy, minimize output loading. Higher sink currents can affect sensor accuracy with internal heating. This can cause an error of 0.64˚C at full
rated sink current and saturation voltage based on junction-to-ambient thermal resistance.
Timing Diagrams
SC (Clock) Period
CS Low to SC (Clock) High Set-Up Time
CS Low to Data Out (SO) Delay
SC (Clock) Low to Data Out (SO) Delay
CS High to Data Out (SO) TRI-STATE
SC (Clock) High to Data In (SI) Hold Time
Data In (SI) Set-Up Time to SC (Clock) High
A
= 25˚C and represent most likely parametric norm.
I
) at any pin exceeds the power supplies (V
Parameter
+
supply voltage range of 3V to 5.5V. The LM74A temperature error specifications for temperature ranges of 0˚C to
FIGURE 2. Data Output Timing Diagram
A
= T
+
J
= 4.5V to 5.5V for the LM74-5 MDA and V
= T
I
MIN
<
5
GND or V
to T
MAX
I
>
Conditions
; all other limits T
+V
±
S
10% from the nominal value of 5V or 3.3V.
) the current at that pin should be limited to 5 mA. The 20 mA
(Note 6)
Typical
A
= T
J
=+25˚C, unless otherwise
+
= 3.0V to 3.6V for the
20017704
(Note 7)
Limits
0.16
100
100
200
DC
70
50
30
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ns (max)
ns (max)
ns (max)
µs (min)
ns (min)
ns (min)
ns (min)
(Limit)
Units
(max)