54121DMQB datasheet(3/6 Pages) NSC

Il numero della parte	54121DMQB

Spiegazioni elettronici	One-Shot with Clear and Complementary Outputs

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Produttore elettronici	NSC [National Semiconductor (TI)]

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3 / 6 page

Switching Characteristics at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Outout Load)

Symbol

Parameter

From (Input)

Conditions

Min

Max

Units

To (Output)

tPLH

Propagation Delay Time

A1 A2

CEXT e 80 pF

70

ns

Low to High Level Output

to Q

RINT to VCC

tPLH

Propagation Delay Time

B to

CL e 15 pF

55

ns

Low to High Level Output

Q

RL e 400X

tPHL

Propagation Delay Time

A1 A2

80

ns

High to Low Level Output

to Q

tPHL

Propagation Delay Time

B

65

ns

High to Low Level Output

to Q

tW(OUT)

Output Pulse

A1 A2 or B

CEXT e 80 pF

Width Using the

to Q Q

RINT to VCC

70

150

ns

Internal Timing Resistor

RL e 400X

CL e 15 pF

tW(OUT)

Output Pulse

A1 A2

CEXT e 0pF

Width Using Zero

to Q Q

RINT to VCC

50

ns

Timing Capacitance

RL e 400X

CL e 15 pF

tW(OUT)

Output Pulse

A1 A2

CEXT e 100 pF

Width Using External

to Q Q

RINT e 10 kX

600

800

ns

Timing Resistor

RL e 400X

CL e 15 pF

A1 A2

CEXT e 1 mF

to Q Q

RINT e 10 kX

68ms

RL e 400X

CL e 15 pF

Operating Rules

1 To use the internal 2 kX timing resistor connect the RINT

pin to VCC

2 An external resistor (RX) or the internal resistor (2 kX)

and an external capacitor (CX) are required for proper

operation The value of CX may vary from 0 to any neces-

sary value For small time constants use high-quality

mica glass polypropylene polycarbonate or polystyrene

capacitors For large time constants use solid tantalum or

special aluminum capacitors If the timing capacitors

have leakages approaching 100 nA or if stray capaci-

tance from either terminal to ground is greater than 50 pF

the timing equations may not represent the pulse width

the device generates

3 The pulse width is essentially determined by external tim-

ing components RX and CX For CX k 1000 pF see Fig-

ure 1 design curves on TW as function of timing compo-

nents value For CX l1000 pF the output is defined as

tW e KRX CX

where RX is in Kilo-ohm

CX is in pico Farad

TW is in nano second

K

07

TLF6538 – 2

FIGURE 1

4 If CX is an electrolytic capacitor a switching diode is often

required for standard TTL one-shots to prevent high in-

verse leakage current

(Figure 2)

TLF6538 – 3

FIGURE 2

3

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