Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-

tended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.

Note 2: Human body model, 1.5k

Ω in series with 100pF.

Note 3: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the

maximum allowed junction temperature at 150˚C. Output currents in excess of 40mA over long term may adversely affect reliability.

Note 5: Typical Values represent the most likely parametric norm.

Note 6: All limits are guaranteed by testing or statistical analysis.

Note 7: Positive current corresponds to current flowing into the device.

Note 8: Slew rate is the slower of the rising and falling slew rates.

Note 9: Shutdown Turn-on and Turn-off times are defined as the time required for the output to reach 90% and 10%, respectively, of its final peak to peak swing when

set for Rail to Rail output swing with a 100KHz sine wave, 2K

Note 10: Limiting input pin current is only necessary for input voltages that exceed absolute maximum input voltage ratings.

Note 11: Short circuit test is a momentary test. See Note 12.

Note 13: machine Model, 0

Ω in series with 200pF.

Application Notes

Shutdown features:

The LMC8101 is capable of being turned off in order to con-

serve power. Once in shutdown, the device supply current is

drastically reduced (1µA maximum) and the output will be

″Tri-stated″.

The shutdown feature of the LMC8101 is designed for flex-

ibility. The threshold level of the SD input can be referenced

to either V

the SL input is connected to V

erenced to V

1.5V from the supply tied to the SL pin. So, for this example,

the device will be in shutdown as long as the SD pin voltage

is within 1V of V

″chatter″ between active and shutdown states, hysteresis is

built into the SD pin transition (see

Figure 1 for an illustration

of this feature). The shutdown threshold and hysteresis level

are independent of the supply voltage.

Figure 1 illustration

applies equally well to the case when SL is tied to V

horizontal axis is referenced to V

should not be set within the voltage range from 1.1V to 1.9V

of the selected supply voltage since this is a transition region

and the device status will be undetermined.

Table 1, below, summarizes the status of the device when

the SL and SD pins are connected directly to V

TABLE 1. LMC8101 Status Summary

SL

SD

LMC8101 Status

V

−

V

−

Shutdown

V

−

V

+

Active

V

+

V

+

Shutdown

V

+

V

−

Active

In case shutdown operation is not needed, as can be seen in

Table 1, the two pins SL and SD can simply be connected to

opposite supply nodes to achieve

″Active″ operation. The SL

and SD should always be tied to a node; if left unconnected,

these high impedance inputs will float to an undetermined

state and the device status will be undetermined as well.

With the device in shutdown, once

″Active″ operation is initi-

ated, there will be a finite amount of time required before the

device output is settled to its final value. This time is less

than 15µs. In addition, there may be some output spike dur-

ing this time while the device is transitioning into a fully op-

erational state. Some applications may be sensitive to this

output spike and proper precautions should be taken in order

to ensure proper operation at all times.

Tiny Package:

The LMC8101 is available in the micro SMD package as well

the 8 pin MSOP package. The micro SMD package requires

approximately 1/4 the board area of a SOT23. This package

is less than 1mm in height allowing it to be placed in absolute

minimum height clearance areas such as cellular handsets,

LCD panels, PCMCIA cards, etc. More information about the

micro

SMD

package

can

be

found

at:

http://

www.national.com/appinfo/microsmd.

DS101240-82

FIGURE 1. Supply Current vs. ’SD’ Voltage

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