DM54123

DM74123

Symbol

Parameter

From (Input)

Units

To (Output)

Min

Max

Min

Max

Propagation Delay Time

A to Q

33

33

ns

Low to High Level Output

Propagation Delay Time

B to Q

28

28

ns

Low to High Level Output

Propagation Delay Time

A to Q

40

40

ns

High to Low Level Output

Propagation Delay Time

BtoQ

36

36

ns

High to Low Level Output

Propagation Delay Time

Clear to Q

40

40

ns

Low to High Level Output

Propagation Delay Time

Clear to Q

27

27

ns

High to Low Level Output

Output Pulse Width

A or B to Q

308

376

308

376

m

s

Operating Rules

from 0 to any necessary value For small time constants

high-grade mica glass polypropylene polycarbonate or

polystyrene material capacitors may be used For large

time constants use tantalum or special aluminum capaci-

tors If the timing capacitors have leakages approaching

100 nA or if stray capacitance from either terminal to

ground is greater than 50 pF the timing equations may

not represent the pulse width the device generates

diode is often required for standard TTL one-shots to pre-

vent high inverse leakage current

(Figure 1) However its

use in general is not recommended with retriggerable op-

eration

as follows

K

028

TLF6539 – 3

FIGURE 1

TLF6539 – 4

FIGURE 2

5 To obtain variable pulse width by remote trimming the

following circuit is recommended

TLF6539 – 5

Note

FIGURE 3

3