TC4468MJD Просмотр технического описания (PDF) - TelCom Semiconductor Inc => Microchip

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TC4468MJD

LOGIC-INPUT CMOS QUAD DRIVERS

TelCom Semiconductor Inc => Microchip 

LOGIC-INPUT CMOS

QUAD DRIVERS

1

TC4467

TC4468

TC4469

Transition power dissipation arises in the

Maximum operating temperature:

complementary configuration (TC446X) because the

output stage N-channel and P-channel MOS transistors

TJ – θJA (PD) = 141°C,

2

are ON simultaneously for a very short period when the

output changes. The transition power dissipation is

approximately:

where: TJ = Maximum allowable junction temperature

(+150°C)

PT = f VS (10 ϫ 10–9).

θJA = Junction-to-ambient thermal resistance

(83.3°C/W) 14-pin plastic package.

Package power dissipation is the sum of load, quies-

cent and transition power dissipations. An example shows

NOTE: Ambient operating temperature should not exceed +85°C for

"EJD" device or +125°C for "MJD" device.

3

the relative magnitude for each term:

C = 1000 pF capacitive load

VS = 15V

D = 50%

f = 200 kHz

PD = Package Power Dissipation = PL + PQ + PT

= 45 mW + 35 mW + 30 mW = 110 mW.

4

VDD

1 µF FILM

0.1 µF CERAMIC

1A 1

1B 2

2A 3

2B 4

3A 5

3B 6

14

13

VOUT

470 pF

12

11

+5V

INPUT

(A, B)

0V

10%

VDD

OUTPUT

90%

tD1

tR

90%

90%

tD2

tF

5

4A 8

4B 9

10

7

0V

10%

10%

6

Input: 100 kHz, square wave,

tRISE = tFALL ≤ 10nsec

Figure 1. Switching Time Test Circuit

7

TELCOM SEMICONDUCTOR, INC.

8

4-265

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