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參數(shù)資料
| 型號(hào)： | MIC1557YM5 TR |
| 廠商： | Micrel Inc |
| 文件頁(yè)數(shù)： | 2/17頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC OSC MONO TIMING 5MHZ SOT23-5 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | IttyBitty® |
| 類型： | 555 型，計(jì)時(shí)器/振蕩器（單路） |
| 頻率： | 5MHz |
| 電源電壓： | 2.7 V ~ 18 V |
| 電流 - 電源： | 350µA |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | SC-74A，SOT-753 |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 供應(yīng)商設(shè)備封裝： | SOT-23-5 |
| 安裝類型： | 表面貼裝 |
| 產(chǎn)品目錄頁(yè)面： | 1113 (CN2011-ZH PDF) |
| 其它名稱： | 576-1055-6 |
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Micrel, Inc.
MIC1555/1557
March 11, 2014
10
Revision 6.0
Functional Description
The MIC1555/7 provides the logic for creating simple RC
timer or oscillator circuits.
The MIC1555 has separate THR (threshold) and TRG
(trigger) connections for monostable (one-shot) or astable
(oscillator) operation.
The MIC1557 has a single T/T (threshold and trigger)
connection for astable (oscillator) operation only. The
MIC1557 includes a CS (chip select/reset) control.
For more information, refer to the MIC1555 Functional
Supply
Voltage supply (VS) is rated for +2.7V to +18V. An
external capacitor is recommended to decouple noise.
Resistive Divider
The resistive voltage divider is constructed of three equal
value resistors to produce 1/3VS and 2/3VS voltage for
trigger and threshold reference voltages.
Chip Select/Reset (MIC1555YMU and MIC1557 only)
Chip select/reset (CS) controls the bias supply to the
oscillator’s internal circuitry. CS must be connected to
CMOS logic-high or logic-low levels. Floating CS will
result in unpredictable operation. When the chip is
deselected, the supply current is less than 1A. Forcing
CS low resets the device by setting the flip flop, forcing
the output low. If Chip Select functionality is not desired,
CS may be connected directly to VS.
Threshold Comparator
The threshold comparator is connected to S (set) on the
RS flip-flop. When the threshold voltage (2/3VS) is
reached, the flip-flop is set, making the output low. THR
is dominant over TRG.
Trigger Comparator
The trigger comparator is connected to R (reset) on the
RS flip-flop. When TRG (trigger) goes below the trigger
voltage (1/3VS), the flip-flop resets, making the output
high.
Flip-Flop and Output
A reset signal causes Q to go low, turning on the P-
channel
MOSFET
and
turning
off
the
N-channel
MOSFET. This makes the output rise to nearly VS.
A set signal causes Q to go high, turning off the P-
channel
MOSFET,
and
turning
on
the
N-channel
MOSFET, grounding OUT.
Basic Monostable Operation
A momentary low signal applied to TRG causes the
output to go high. The external capacitor charges slowly
through the external resistor. When threshold voltage
(VTHR) reaches 2/3VS, the output is switched off,
discharging the capacitor. During power-on, a single
pulse may be generated.
For more information, refer to the MIC1555 Functional
Basic Astable Operation
Refer to the MIC1557 functional diagram.
The MIC1557 starts with T/T low, causing the output to
go high. The external capacitor charges slowly through
the external resistor. When VT/T reaches 2/3VS (threshold
voltage), the output is switched off, slowly discharging the
capacitor.
When
VT/T decreases to 1/3VS (trigger
voltage), the output is switched on, causing VT/T to rise
again, repeating the cycle.
For more information, refer to the MIC1557 Functional
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