MC14538BDTR2G datasheet(4/14 Pages) ONSEMI

部件名	MC14538BDTR2G

功能描述	Dual Precision Retriggerable/Resettable Monostable Multivibrator

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制造商	ONSEMI [ON Semiconductor]

网页	http://www.onsemi.com

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MC14538B

http://onsemi.com

4

SWITCHING CHARACTERISTICS (Note 4) (CL = 50 pF, TA = 25_C)

Characteristic

Symbol

VDD

Vdc

All Types

Unit

Min

Typ

(Note 5)

Max

Output Rise Time

tTLH = (1.35 ns/pF) CL + 33 ns

tTLH = (0.60 ns/pF) CL + 20 ns

tTLH = (0.40 ns/pF) CL + 20 ns

tTLH

5.0

10

15

−

100

50

40

200

100

80

ns

Output Fall Time

tTHL = (1.35 ns/pF) CL + 33 ns

tTHL = (0.60 ns/pF) CL + 20 ns

tTHL = (0.40 ns/pF) CL + 20 ns

tTHL

5.0

10

15

−

100

50

40

200

100

80

ns

Propagation Delay Time

A or B to Q or Q

tPLH, tPHL = (0.90 ns/pF) CL + 255 ns

tPLH, tPHL = (0.36 ns/pF) CL + 132 ns

tPLH, tPHL = (0.26 ns/pF) CL + 87 ns

tPLH,

tPHL

5.0

10

15

−

300

150

100

600

300

220

ns

Reset to Q or Q

tPLH, tPHL = (0.90 ns/pF) CL + 205 ns

tPLH, tPHL = (0.36 ns/pF) CL + 107 ns

tPLH, tPHL = (0.26 ns/pF) CL + 82 ns

5.0

10

15

−

250

125

95

500

250

190

ns

Input Rise and Fall Times

Reset

tr, tf

5

10

15

−

15

5

4

ms

B Input

5

10

15

−

300

1.2

0.4

1.0

0.1

0.05

ms

A Input

5

10

15

No Limit

−

Input Pulse Width

A, B, or Reset

tWH,

tWL

5.0

10

15

170

90

80

85

45

40

−

ns

Retrigger Time

trr

5.0

10

15

0

−

ns

Output Pulse Width — Q or Q

Refer to Figures 8 and 9

CX = 0.002 mF, RX = 100 kW

T

5.0

10

15

198

200

202

210

212

214

230

232

234

ms

CX = 0.1 mF, RX = 100 kW

5.0

10

15

9.3

9.4

9.5

9.86

10

10.14

10.5

10.6

10.7

ms

CX = 10 mF, RX = 100 kW

5.0

10

15

0.91

0.92

0.93

0.965

0.98

0.99

1.03

1.04

1.06

s

Pulse Width Match between circuits in

the same package.

CX = 0.1 mF, RX = 100 kW

100

[(T1 – T2)/T1]

5.0

10

15

−

± 1.0

± 5.0

%

4. The formulas given are for the typical characteristics only at 25_C.

5. Data labelled “Typ” is not to be used for design purposes but is intended as an indication of the IC’s potential performance.

OPERATING CONDITIONS

External Timing Resistance

RX

−

5.0

−

(Note 6)

kW

External Timing Capacitance

CX

−

0

−

No Limit

(Note 7)

mF

6. The maximum usable resistance RX is a function of the leakage of the capacitor CX, leakage of the MC14538B, and leakage due to board

layout and surface resistance. Susceptibility to externally induced noise signals may occur for RX > 1 MW..

7. If CX > 15 mF, use discharge protection diode per Fig. 11.

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