LM88 datasheet(4/9 Pages) NSC

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LM88 Electrical Characteristics (Continued)

Note 2: When the input voltage (VI) at any pin exceeds the power supply (VI < GND or VI > V

+), the current at that pin should be limited to 5mA. The 20mA

maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5mA to four.

Note 3: Parasitics or ESD protection circuitry are shown in the diagram found below. The ESD Clamp circtuitry is triggered on when there is an ESD event. The table

maps what devices appear on the different pins.

Pin Name

D0+

XXXX

Ω

D−

XXXXXX

Ω

D1+

XXXX

Ω

O_CRIT

XXXX

Ω

O_SP1

XXXX

Ω

O_SP0

XXXX

Ω

10132604

Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (junction to

ambient thermal resistance) and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PD =(TJmax–TA)/θJA or the number

given in the Absolute Maximum Ratings, whichever is lower. For this device, TJmax = 125˚C. For this device the typical thermal resistance (θJA) of the different

package types when board mounted follow:

Package Type

MUA08A

250˚C/W

Note 5: The human body model is a 100pF capacitor discharged through a 1.5k

Ω resistor into each pin. The machine model is a 200pF capacitor discharged directly

into each pin.

Note 6: See the URL ”http://www.national.com/packaging/“ for other recomdations and methods of soldering surface mount devices.

Note 7: Typicals are at TJ =TA = 25˚C and represent most likely parametric norm.

Note 8: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 9: These are sample temperature ranges, contact the factory for other temperature ranges. Performance is dependent on temperature range.

Note 10: The two IOH specifications are intended to describe two operating regions of the output voltage. In Region 1, V

+− 0.6V and below, there is normal leakage

current, 2µA (max). In Region 2, V+− 0.6V to V+, there is additional current flowing caused by the ESD protection circuitry (see Figure in Note 3). The maximum

current flow is under short circuit conditions as specified at 40µA (max). Under normal operating conditions a pull-resistor (R) will be used. The voltage drop across

this pull-up resistor caused by the 2µA normal leakage current with large values of R (much greater than 100k) will bias diode D1 into the cutoff region causing the

additional current to be negligible in the voltage drop calculation. With low values of R more current will flow as in the case of a 1.1k pull-up, 20µA may flow causing

less than 22mV of voltage drop.

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