參數(shù)資料
型號(hào)： MAX6874ETJ+T
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 電源管理
英文描述： EEPROM-Programmable, Hex/Quad, Power-Supply Sequencers/Supervisors
中文描述： 6-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC32
封裝： 7 X 7 MM, TQFN-32
文件頁(yè)數(shù)： 4/40頁(yè)
文件大小： 403K
代理商： MAX6874ETJ+T
MAX6874/MAX6875
EEPROM-Programmable, Hex/Quad,
Power-Supply Sequencers/Supervisors
12
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Powering the MAX6874/MAX6875
The MAX6874/MAX6875 derive power from the positive
voltage-detector inputs: IN1 or IN3–IN5. A virtual diode-
ORing scheme selects the positive input that supplies
power to the device (see the Functional Diagram). IN1
must be at least +4V or one of IN3–IN5 (MAX6874)/
IN3–IN4 (MAX6875) must be at least +2.7V to ensure
device operation. An internal LDO regulates IN1 down
to +5.4V.
The highest input voltage on IN3–IN5 (MAX6874)/
IN3–IN4 (MAX6875) supplies power to the device, unless
VIN1 ≥ +6.5V, in which case IN1 supplies power to the
device. For +4V < VIN1 < +6.5V and one of VIN3 through
VIN5 > +2.7V, the input power source cannot be deter-
mined due to the dropout voltage of the LDO. Internal
hysteresis ensures that the supply input that initially pow-
ered the device continues to power the device when
multiple input voltages are within 50mV of each other.
ABP powers the analog circuitry; bypass ABP to GND
with a 1F ceramic capacitor installed as close to the
device as possible. The internal supply voltage, mea-
sured at ABP, equals the maximum of IN3–IN5
(MAX6874)/IN3–IN4 (MAX6875) if VIN1 = 0, or equals
+5.4V when VIN1 > +6.5V. Do not use ABP to provide
power to external circuitry.
The MAX6874/MAX6875 also generate a digital supply
voltage (DBP) for the internal logic circuitry and the
EEPROM; bypass DBP to GND with a 1F ceramic
capacitor installed as close to the device as possible.
The nominal DBP output voltage is +2.55V. Do not use
DBP to provide power to external circuitry.
Inputs
The MAX6874/MAX6875 contain multiple logic and volt-
age-detector inputs. Table 1 summarizes these various
inputs.
Set the threshold voltages for each voltage-detector
input with registers 00h–05h. Each threshold voltage is
an undervoltage threshold. Set the threshold range for
each voltage detector with register 0Dh.
Table 1. Programmable Features
FEATURE
DESCRIPTION
High-Voltage Input
(IN1)
Undervoltage threshold
+2.5V to +13.2V threshold in 50mV increments
+1.25V to +7.625V threshold in 25mV increments
Voltage Input (IN2)
Undervoltage threshold
+2.5V to +5.5V threshold in 50mV increments
+1.25V to +3.05V threshold in 25mV increments
Voltage Input
IN3–IN6 (MAX6874),
IN3–IN4 (MAX6875)
Undervoltage threshold
+1V to +5.5V threshold in 20mV increments
+0.5V to +3.05V threshold in 10mV increments
Programmable Outputs
PO1–PO8 (MAX6874),
PO1–PO5 (MAX6875)
Active high or active low
Open-drain output
Dependent on MR, MARGIN, IN_, GPI1–GPI4 , WD, and/or PO_
Programmable timeout periods of 25s, 1.5625ms, 6.25ms, 25ms, 50ms, 200ms, 400ms, or 1.6s
General-Purpose
Logic Inputs,
GPI1–GPI4 (MAX6874),
GPI1–GPI3 (MAX6875)
Active-high or active-low logic levels
Configure GPI_ as inputs to watchdog timers or programmable output stages
Watchdog Timer
Clear dependent on any combination of one GPI_ input and one programmable output, a GPI_ input
only, or a programmable output only
Initial watchdog timeout period of 6.25ms, 25ms, 100ms, 400ms, 1.6s, 6.4s, 25.6s, or 102.4s
Normal watchdog timeout period of 6.25ms, 25ms, 100ms, 400ms, 1.6s, 6.4s, 25.6s, or 102.4s
Watchdog enable/disable
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX6874TCC+ 制造商:Maxim Integrated Products 功能描述:
MAX6875ETJ 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX6875ETJ+ 功能描述:監(jiān)控電路 EEPROM-Prog Quad Power-Sup Sequencer RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX6875ETJ+T 功能描述:監(jiān)控電路 EEPROM-Prog Quad Power-Sup Sequencer RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX6875ETJ-T 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
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