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參數(shù)資料
| 型號： | ALD7556SBL |
| 廠商： | Advanced Linear Devices Inc |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TIMER CMOS ANLG RC DL 14SOIC |
| 標(biāo)準(zhǔn)包裝： | 56 |
| 類型： | 555 型，計時器/振蕩器（雙路） |
| 頻率： | 2.5MHz |
| 電源電壓： | 2 V ~ 10 V |
| 電流 - 電源： | 100µA |
| 工作溫度： | 0°C ~ 70°C |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 包裝： | 管件 |
| 供應(yīng)商設(shè)備封裝： | 14-SOIC |
| 安裝類型： | 表面貼裝 |
| 其它名稱： | 1014-1192 |
ALD7555/ALD7556
Advanced Linear Devices
4 of 12
MONOSTABLE OPERATION
In this mode of operation the ALD7555 and the ALD7556
can be connected as a one-shot circuit which produces an
output pulse with a user-adjustable pulse delay time. The
pulse delay time is set by the external R and C values, which
together produce a RC time constant that is proportional to
the time delay. (See typical applications) The pulse is started
with an external negative going Trigger pulse applied to TRIG-
GER pin. This negative going pulse set an internal flip-flop
so that the external R and C can start the RC timing while
the OUTPUT pin is in the HIGH state. The external C is
being charged by the external R. When the voltage between
the R and C is charged passed the internal threshold volt-
age at the THRESHOLD pin, which is set at 66.6% of V+,
the internal comparator of the ALD7555 and the ALD7556
resets the internal flip-flop. This then turns on the Discharge
Driver at DISCHARGE pin, and discharges the timing ca-
pacitor C. The cycle is completed when the OUTPUT is driven
to a low state and the ALD7555 and the ALD7556 are again
waiting for the next negative going trigger pulse at TRIG-
GER pin.
CONTROL Voltage and RESET pins
The CONTROL pin directly accesses one input to the upper
comparator. As the input reference resistor string has on-
chip high impedance resistors, an input voltage at the CON-
TROL input can easily change the voltage at the comparator
input. This allows the user to change the oscillation fre-
quency, or modulate the oscillation frequency of the analog
timer, with a separate user provided frequency. The CON-
TROL pin also allows a user-provided inhibit signal to stop
and start the timerís oscillation.
The RESET terminal directly resets the internal RS flip-flop
circuit, which in turn controls the OUTPUT and DISCHARGE
pins. This function is activated by a low voltage input of 0.7V
of 100 ns minimum duration. By injecting a variety of input
signals in a combination to the TRIGGER , THRESHOLD,
CONTROL and RESET pins, many interesting modulation
and demodulation signals can be manipulated and/or gen-
erated by the circuit designer.
APPLICATION NOTES (cont’d)
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