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參數(shù)資料
| 型號： | MC10198FNR2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 諧振器 |
| 英文描述： | 10K SERIES, MONOSTABLE MULTIVIBRATOR, PQCC20 |
| 封裝： | PLASTIC, LCC-20 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 154K |
| 代理商： | MC10198FNR2 |
MC10198
http://onsemi.com
7
APPLICATIONS INFORMATION
Circuit Operation:
1. PULSE WIDTH TIMING — The pulse width is determined by the external resistor and capacitor. The MC10198
also has an internal resistor (nominally 284 ohms) that can be used in series with RExt. Pin 7, the external pulse
width control, is a constant voltage node (–3.60 V nominally). A resistance connected in series from this node to
VEE sets a constant timing current IT. This current determines the discharge rate of the capacitor:
where
T = pulse width
V = 1.9 V change in capacitor voltage
Then:
If RExt + RInt are in series to VEE:
IT = [(–3.60 V) – (–5.2 V)] ÷ [RExt + 284 ]
IT = 1.6 V/(RExt + 284)
The timing equation becomes:
T = [(CExt)(1.9 V)] ÷ [1.6 V/(RExt + 284)]
T = CExt (RExt + 284) 1.19
where
T = Sec
RExt = Ohms
CExt = Farads
Figure 2 shows typical curves for pulse width versus CExt
and RExt (total resistance includes RInt). Any low leakage ca-
pacitor can be used and RExt can vary from 0 to 16 k–ohms.
2. TRIGGERING —The Epos and ENeg inputs control the trigger input. The MC10198 can be programmed to trigger
on the positive edge, negative edge, or both. Also, the trigger input can be totally disabled. The truth table is
shown on the first page of the data sheet.
The device is totally retriggerable. However, as duty cycle
approaches 100%, pulse width jitter can occur due to the re-
covery time of the circuit. Recovery time is basically depen-
dent on capacitance CExt. Figure 3 shows typical recovery
time versus capacitance at IT = 5 mA.
IT = CExt
V
T
T = CExt
1.9 V
IT
VEE = -5.2 V
-3.60 V External
Pulse Width Control
284
RInt
MC10198
RExt
FIGURE 1 —
CExt
6
4
7
10 k
RExt = 0
3 k
500
CExt - TIMING CAPACITANCE
10 pF
10
FIGURE 2 – TIMING PULSE WIDTH versus CExt and RExt
100
10
1
0.1 F
100
1000 pF
100 pF
0.01 F
NOTE: TOTAL RESISTANCE
= RExt + RInt
PULSE
WIDTH
(s)
CExt - TIMING CAPACITANCE
0.01 F
100 pF
1000 pF
100 ns
0.1 F
10 s
1 s
1 ns
10 ns
10 pF
FIGURE 3 — RECOVERY TIME versus CExt @ IT = 5 mA
RECOVER
YTIME
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