MC10198 查看數據表（PDF） - Motorola => Freescale

零件编号

产品描述 (功能)

比赛名单

MC10198

Monostable multivibrator

Motorola => Freescale 

MC10198

3.HI–SPEED INPUT — This input is used for stretching

very narrow pulses with minimum delay between the

output pulse and the trigger pulse. The trigger input

should be disabled when using the high–speed input.

The MC10198 triggers on the rising edge, using this in-

put, and input pulse width should narrow, typically less

than 10 nanoseconds.

FIGURE 5 — PULSE WIDTH versus IT @ CExt = 13 pF

1000

USAGE RULES:

1.Capacitor lead lengths should be kept very short to mini-

mize ringing due to fast recovery rise times.

2.The E inputs should not be tied to ground to establish a

high logic level. A resistor divider or diode can be used

to establish a –0.7 to –0.9 voltage level.

3.For optimum temperature stability; 0.5 mA is the best tim-

ing current IT. The device is designed to have a constant

voltage at the EXTERNAL PULSE WIDTH CONTROL

over temperature at this current value.

4.Pulse Width modulation can be attained with the EXTER-

NAL PULSE WIDTH CONTROL. The timing current can

be altered to vary the pulse width. Two schemes are:

a. The internal resistor is not used. A dependent cur-

rent source is used to set the timing current as

shown in Figure 4. A graph of pulse width versus

timing current (CExt = 13 pF) is shown in Figure 5.

100

10

0.01 mA

0.1 mA

1 mA

IT – TIMING CURRENT

10 mA

b. A control voltage can also be used to vary the

pulse width using an additional resistor (Figure 6).

The current (IT + IC) is set by the voltage drop

across RInt + RExt. The control current IC modifies

IT and alters the pulse width. Current IC should

never force IT to zero. RC typically 1 kΩ.

FIGURE 4 —

FIGURE 6 —

4

CExt

MC10198

7

I

4

CExt

IT

7 IC

–3.6 RC

284

V

6

IT + IC

RExt

–5.2 V

Control

Voltage

MOTOROLA

3–178

MECL Data

DL122 — Rev 6

Share Link: