- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄384737 > MIC7221BM5 (MICREL INC) IttyBitty⑩ Rail-to-Rail Input Comparator Preliminary Information PDF資料下載
參數(shù)資料
| 型號(hào)： | MIC7221BM5 |
| 廠商： | MICREL INC |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | IttyBitty⑩ Rail-to-Rail Input Comparator Preliminary Information |
| 中文描述： | COMPARATOR, 10000 uV OFFSET-MAX, 75 ns RESPONSE TIME, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大小： | 75K |
| 代理商： | MIC7221BM5 |
June 1999
5
MIC7211/7221
MIC7211/7221
Application Information
The small outline and low supply current (typically 7
μ
A at 5V)
of the MIC7211/21 are the primary advantages of these
comparators. They have been characterized for 2.2V, 2.7V,
5V, and 10V operation.
Their 2.2V capability is especially useful in low-battery volt-
age situations. Low-voltage operation allows longer battery
life or deeper discharge capability. Even at 2.2V, the output
can drive several logic-gate inputs. At 2.5mA, the output
stage voltage drop is guaranteed to not exceed 0.1V.
Outputs
The MIC7211 has a push-pull output while the MIC7221 has
an open-drain output, otherwise both comparators share a
common design.
The open-drain MIC7221 output can be pulled up to 10V,
even when the supply voltage is as low as 2.2V. Conversely,
the output also can be pulled up to voltages that are lower
than the positive supply. Logic-level translation is readily
facilitated by the ability to pull the open-drain output to
voltages above or below the power supply.
Although specified short-circuit output current specified for
these parts typically exceeds 100mA, their output is not
intended to sink or source anywhere near 100mA. The short-
circuit rating is only presented as additional information
regarding output impedance and may be useful for determin-
ing the voltage drop one may experience when driving a given
load.
Input Bias Current
The low input-bias current (typically 0.5pA) requirement of
the MIC7211/21 provides flexibility in the kinds of circuitry and
devices that can be directly interfaced.
Designs using an amplifier for transducer-to-comparator
impedance transformation may be simplified by using the
MIC7211/21’s low-input-current requirement to eliminate the
amplifier.
Input Signal Levels
Input signals may exceed either supply rail by up to 0.2V
without phase inversion or other adverse effects. The inputs
have internal clamp diodes to the supply pins.
Micrel
R
IN
V
(
±
100V)
V
REF
R1
R
F
V
OUT
≥
100k
0.1μF
Note: R
F
and R1 control hysteresis (typically, R
F
>> R1).
V
+
Figure 1. Driving the Input Beyond the Supply Rails
Larger input swings can be accommodated if the input current
is limited to 1mA or less. Using a 100k input resistor will allow
an input to swing up to 100V beyond either supply rail.
Because of the low input bias current of the device, even
larger input resistors are practical. See Figure 1. The ability
to swing the input beyond either rail facilitates some other-
wise difficult circuits, such as a single-supply zero-crossing
detector or a circuit that senses its own supply voltage.
The comparator must be powered if an input is pulled above
the rail, even with current limiting in effect. Figure 2 shows a
hypothetical situation where an input is pulled higher than the
rail when the power supply is off or not present. Figure 2 also
shows external clamp diodes for additional input circuit
protection. Discrete clamp diodes can be arbitrarily more
robust than the internal clamp diodes.
The power supply has been simplified (real power supplies do
not have a series output diode); however, this illustrates a
common characteristic of most positive-voltage power sup-
plies: they are designed to source, but not sink, current. If the
supply is off, or disconnected, there is no limiting voltage for
the clamp diode to reference. The input signal can charge the
the bypass capacitor, and possibly the filter capacitor, up to
the applied input (V
IN
). This may be high enough to cause a
thin-oxide rupture in a CMOS integrated circuit.
V
+
R
IN
V
IN
(>>V+)
V
REF
R1
R
F
V
OUT
0.1μF
Note: 1V
≤
V
++
≤
10V
V
++
R
PU
DPOSSIBLE
0V WHEN
Power
Supply
Output
Figure 2. Avoid This Condition
Ideally, the supply for the comparator and the input-produc-
ing circuitry should the same or be switched simultaneously.
Bypass Capacitors
CMOS circuits, especially logic gates with their totem-pole
(push-pull) output stages, generate power supply current
spikes (noise) on the supply and/or ground lines. These
spikes occur because, for a finite time during switching, both
output transistors are partially on allowing “shoot-through
current.” Bypass capacitors reduce this noise.
Adequate bypassing for the MIC7211 comparator is 0.01
μ
F;
in low-noise systems, where this noise may interfere with the
functioning or accuracy of nearby circuitry, 0.1
μ
F is recom-
mended. Because the MIC7221 does not have a totem-pole
output stage, this spiking is not evident; however, switching
a capacitive load can present a similar situation.
Thermal Behavior
The thermal impedance of a SOT-23-5 package is 325C/W.
The 5V Electrical Characteristics table shows a maximum
voltage drop of 0.1V for a 5mA output current, making the
output resistance about 20
(R = 0.1/0.005 = 20
). Attempt-
ing to draw the typical specified output short-circuit current of
150mA (sourcing) can be expected to cause a die tempera-
ture riseof 146C. (Operating die temperature for ICs should
generally not exceed 125C.) Using a series resistance is the
simplest form of protecting against damage by excessive
output current.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC8021-0001 | Semicustom High-Voltage Array Summary Information |
| MIC8021-0002 | Semicustom High-Voltage Array Summary Information |
| MIC841 | Comparator with Reference |
| MIC841HBC5 | Comparator with Reference |
| MIC841HYC5 | Comparator with Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC7221BM5 TR | 功能描述:IC COMPARATOR R-R SOT-23-5 RoHS:否 類(lèi)別:集成電路 (IC) >> 線性 - 比較器 系列:IttyBitty® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:通用 元件數(shù):1 輸出類(lèi)型:CMOS，推挽式，滿擺幅，TTL 電壓 - 電源，單路/雙路(±):2.5 V ~ 5.5 V，±1.25 V ~ 2.75 V 電壓 - 輸入偏移（最小值）:5mV @ 5.5V 電流 - 輸入偏壓（最小值）:1pA @ 5.5V 電流 - 輸出（標(biāo)準(zhǔn)）:- 電流 - 靜態(tài)（最大值）:24µA CMRR, PSRR（標(biāo)準(zhǔn)）:80dB CMRR，80dB PSRR 傳輸延遲（最大）:450ns 磁滯:±3mV 工作溫度:-40°C ~ 85°C 封裝/外殼:6-WFBGA，CSPBGA 安裝類(lèi)型:表面貼裝 包裝:管件 其它名稱(chēng):Q3554586 |
| MIC7221YM5 | 制造商:MICREL 制造商全稱(chēng):Micrel Semiconductor 功能描述:IttyBitty Rail-to-Rail Input Comparator |
| MIC7221YM5 TR | 功能描述:校驗(yàn)器 IC Micro-Power 1.8V IttyBitty Comparator (Open Drain Output) - Lead Free RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類(lèi)型: 通道數(shù)量: 輸出類(lèi)型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MIC7221YM5TR | 制造商:Micrel Inc 功能描述: |
| MIC7221YM5-TR | 功能描述:Comparator General Purpose Open Drain SOT-23-5 制造商:microchip technology 系列:IttyBitty? 包裝:剪切帶（CT） 零件狀態(tài):有效 類(lèi)型:通用 元件數(shù):1 輸出類(lèi)型:開(kāi)路漏極 電壓 - 電源，單/雙（±）:2.2 V ~ 10 V 電壓 - 輸入失調(diào)（最大值）:10mV @ 5V 電流 - 輸入偏置（最大值）:0.5pA @ 5V 電流 - 輸出（典型值）:- 電流 - 靜態(tài)（最大值）:25μA CMRR，PSRR（典型值）:70dB CMRR，90dB PSRR 傳播延遲（最大值）:5μs 滯后:- 工作溫度:-40°C ~ 85°C 封裝/外殼:SC-74A，SOT-753 安裝類(lèi)型:表面貼裝 供應(yīng)商器件封裝:SOT-23-5 標(biāo)準(zhǔn)包裝:1 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。