LMF60 datasheet(5/20 Pages) NSC

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Logic Input-Output Characteristics (Continued)

The following specifications apply for Vb e 0V (Note 15) LSh e 0V unless otherwise specified Boldface limits apply for TA

TJ e TMIN to TMAX all other limits TA e TJ e 25 C

Symbol

Parameter

Conditions

Typical

Limits

Units

(Note 8)

(Note 9)

(Limits)

SCHMITT TRIGGER

VTa

Positive Going Input

10V

V (Min)

Threshold Voltage

V (Max)

V (Min)

V (Max)

VTb

Negative Going Input

10V

V (Min)

Threshold Voltage

V (Max)

V (Min)

V (Max)

VTa bVTb

Hysteresis

10V

V (Min)

V (Max)

V (Min)

V (Max)

VOH

Logical ‘‘1’’ Voltage

10V

V (Min)

IO eb10 mA Pin 11

V (Min)

VOL

Logical ‘‘0’’ Voltage

10V

V (Max)

IO eb10 mA Pin 11

V (Max)

ISOURCE

Output Source

CLK R to V

Current Pin 11

10V

mA (Min)

ISINK

Output Sink

CLK R to V

Current Pin 11

10V

mA (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 Specified Electrical Characteristics do not apply when operating the device outside its specified conditions

Note 2

All voltages are measured with respect to AGND unless otherwise specified

Note 3

When the input voltage (VIN) at any pin exceeds the power supply rails (VIN k Vb or VIN l Va) the absolute value of current at that pin should be limited

to 5 mA or less The 20 mA package input current limits the number of pins that can exceed the power supply boundaries with 5 mA to four

Note 4

The Maximum power dissipation must be derated at elevated temperatures and is dictated by TJ Max iJA and the ambient temperature TA The maximum

allowable power dissipation is PD e (TJ Max b TA) iJA or the number given in the absolute ratings whichever is lower For this device TJ Max e 125 C and the

typical junction-to-ambient thermal resistance of the LMF60CCN when board mounted is 67 CW For the LMF60CIJ this number decreases to 62 CW For the

LMF60CIWM iJA e 78 CW

Note 5

Human body model 100 pF discharged through a 15 kX resistor

Note 6

See AN450 ‘‘Surface Mounting Methods and Their Effect on Product Reliability’’ or the section titled ‘‘Surface Mount’’ found in any current Linear Databook

for other methods of soldering surface mount devices

Note 7

The specifications given are for a clock frequency (fCLK) of 500 kHz at a5V and 250 kHz at g25V Above this frequency the cutoff frequency begins to

deviate from the specified error band over the temperature range but the filter still maintains its amplitude characteristics See application hints

Note 8

Typicals are at 25 C and represent the most likely parametric norm

Note 9

Guaranteed to National’s Average Outgoing Quality Level (AOQL)

Note 10

The cutoff frequency of the filter is defined as the frequency where the magnitude response is 301 dB less than the DC gain of the filter

Note 11

The short circuit source current is measured by forcing the output to its maximum positive swing and then shorting that output to the negative supply The

short circuit sink current is measured by forcing the output being tested to its maximum negative voltage and then shorting that output to the positive supply These

are worst case conditions

Note 12

For g5V supplies the dynamic range is referenced to 262 Vrms (37V peak) where the wideband noise over a 20 kHz bandwidth is typically 100 mV For

25V supplies the dynamic range is referenced to 0849 Vrms (12V peak) where the wideband noise over a 20 kHz bandwidth is typically 75 mVrms

Note 13

The filter’s magnitude response is tested at the cutoff frequency fC atfIN e 2fC and at these two additional frequencies

Note 14

The LMF60 is operated with symmetrical supplies and LSh is tied to GND

Note 15

For simplicity all the logic levels (except for the TTL input logic levels) have been referenced to Vb e 0V The logic levels will scale accordingly for g5V

and g25V supplies

Note 16

The nominal ratio of the clock frequency to the low-pass cutoff frequency is internally set to 50-to-1 (LMF60-50) or 100-to-1 (LMF60-100)

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