DS1649 datasheet(3/6 Pages) NSC

3 / 6 page

Switching Characteristics (VCC e 5V TA e 25 C) (Note 4)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

tSg

Storage Delay Negative Edge

(

Figure 1 )CL e 50 pF

CL e 500 pF

tSg

Storage Delay Positive Edge

(

Figure 1 )CL e 50 pF

CL e 500 pF

Fall Time

(

Figure 1 )CL e 50 pF

CL e 500 pF

Rise Time

(

Figure 1 )CL e 50 pF

CL e 500 pF

tZL

Delay from Disable Input to Logical ‘‘0’’

CL e 50 pF

Level (from High Impedance State)

RL e 2kX to VCC (Figure 2 )

tZH

Delay from Disable Input to Logical ‘‘1’’

CL e 50 pF

815

Level (from High Impedance State)

RL e 2kX to GND (Figure 2 )

tLZ

Delay from Disable Input to High Impedance

CL e 50 pF

State (from Logical ‘‘0’’ Level)

RL e 400X to VCC (Figure 3 )

tHZ

Delay from Disable Input to High Impedance

CL e 50 pF

State (from Logical ‘‘1’’ Level)

RL e 400X to GND (Figure 3 )

Note 1

‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed Except for ‘‘Operating Temperature Range’’

they are not meant to imply that the devices should be operated at these limits The table of ‘‘Electrical Characteristics’’ provides conditions for actual device

operation

Note 2

Unless otherwise specified minmax limits apply across the b55 Cto a125 C temperature range for the DS1649 and DS1679 and across the 0 Cto

70 C range for the DS3649 and DS3679 All typical values are for TA e 25 C and VCC e 5V

Note 3

All currents into device pins shown as positive out of device pins as negative all voltages referenced to ground unless otherwise noted All values shown

as max or min on absolute value basis

Note 4

When measuring output drive current and switching response for the DS1679 and DS3679 a 15X resistor should be placed in series with each output This

resistor is internal to the DS1649DS3649 and need not be added

AC Test Circuits and Switching Time Waveforms

tSg tS’ tR tF

TLF7515 – 4

TLF7515 – 5

FIGURE 1

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