- 您现在的位置：买卖IC网 > PDF目录13330 > MAX6894ETI+T (Maxim Integrated Products)IC SEQUENCE/SUPERVISOR 28TQFN PDF资料下载
参数资料
| 型号： | MAX6894ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC SEQUENCE/SUPERVISOR 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 序列发生器 |
| 监视电压数目： | 4 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 可调节/可选择 |
| 电压 - 阀值： | 可调节/可选择 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
Pin-Selectable, Octal/Hex/Quad, Power-Supply
Sequencers/Supervisors
Detailed Description
The MAX6892/MAX6893/MAX6894 pin-selectable, mul-
tivoltage supply sequencers/supervisors monitor sever-
al voltage detector inputs and one watchdog input,
asserting the outputs when the respective input thresh-
olds have been reached or a timeout occurs. All ver-
sions have an enable manual reset and margin input
disable. The MAX6892/MAX6893/MAX6894 voltage
thresholds are selected by logic inputs and/or an exter-
nal voltage-divider. A RESET output ensures all moni-
tored inputs are above the pin-selected/adjustable
thresholds. Watchdog and reset timeout periods can
use factory default settings or are independently
adjustable by connecting external capacitors. In addi-
tion, all devices can be powered through the voltage
detector inputs alone, or externally supplied from a
constant supply on the V CC pin (see the Powering the
MAX6892/MAX6893/MAX6894 section). The outputs
The MAX6892/MAX6893/MAX6894 also generate a dig-
ital supply voltage (DBP) for the internal logic circuitry
and the output stages. Bypass DBP to GND with a 1μF
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 MAX6892/MAX6893/MAX6894 contain multiple
logic and voltage detector inputs. Each voltage detec-
tor input is monitored for undervoltage thresholds.
Voltage Detector Inputs (IN_)
The MAX6892/MAX6893/MAX6894 offer several moni-
tor options with both pin-selectable and adjustable
reset thresholds. The threshold voltage at each
adjustable IN_ input is typically 0.6V. To monitor a volt-
age > 0.6V, connect a resistor-divider network to the
circuit as shown in Figure 1:
are factory configured as open drain.
V IN_TH = V TH (R 1 + R 2 )/R 2
(Equation 1)
Powering the
MAX6892/MAX6893/MAX6894
The MAX6892/MAX6893/MAX6894 derive power from
the voltage detector inputs: IN2 –IN5 (MAX6892/
MAX6893), IN2–IN4 (MAX6894), or through an external-
ly supplied V CC . A virtual diode-ORing scheme selects
the positive input that supplies power to the device
(see the Functional Diagram). The highest input voltage
on IN2–IN5 (MAX6892/MAX6893)/IN2–IN4 (MAX6894)
supplies power to the device. One of IN2 –IN5
(MAX6889/MAX6890)/IN2–IN4 (MAX6891) or V CC must
be at least 2.7V to ensure proper operation.
Internal hysteresis ensures that the supply input that
initially powered the device continues to power the
where V IN_TH is the desired reset threshold voltage for
the respective IN_ and V TH is the input threshold
(0.6V).
Resistors R 1 and R 2 can have high values to minimize
current consumption due to low-leakage currents. Set
R 2 to some conveniently high value (10k Ω , for exam-
ple) and calculate R 1 based on the desired reset
threshold voltage, using the following formula:
R 1 = R 2 x (V IN_TH /V TH - 1)
V IN_TH
device when multiple input voltages are within 50mV of
each other.
R 1
V CC
V CC powers the analog circuitry and is the bypass con-
nection for the MAX6892/MAX6893/MAX6894 internal
supply. Bypass V CC to GND with a 1μF ceramic capac-
itor installed as close to the device as possible. The
internal supply voltage, measured at V CC , equals the
R 2
IN_
GND
MAX6892
MAX6893
MAX6894
V CC
maximum of IN2–IN5. If V CC is externally supplied, V CC
must be at least 200mV higher than any voltage
applied to IN2–IN5 and V CC must be brought up first.
V CC always powers the device when all IN_ are factory
set as “ADJ.” Do not use the internally generated V CC
to provide power to external circuitry.
V IN_TH = 0.6 x (R 1 + R 2 )/R 2
Figure 1. Adjusting the Monitored Threshold
______________________________________________________________________________________
11
相关PDF资料 |
PDF描述 |
|---|---|
| SCEP134S-R90 | INDUCTOR SMD 0.90UH 21.6A 100KHZ |
| RGM18DTAN | CONN EDGECARD 36POS R/A .156 SLD |
| LM2575D2T-ADJR4 | IC REG BUCK ADJ 1A D2PAK |
| V375B48C200BG2 | CONVERTER MOD DC/DC 48V 200W |
| VI-2V4-EX-F3 | CONVERTER MOD DC/DC 48V 75W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6895AALT | 制造商:Maxim Integrated Products 功能描述:ULTRA-SMALL ADJUSTABLE SEQUENCING/ - Rail/Tube |
| MAX6895AALT/GH9 | 制造商:Maxim Integrated Products 功能描述:ULTRA-SMALL, ADJUSTABLE SEQUENCING/SUPERVISORY CIRCUITS - Rail/Tube |
| MAX6895AALT+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR ADJV 10UA 6PIN UDFN - Rail/Tube |
| MAX6895AALT+T | 功能描述:监控电路 Adjustable Sequencer/Supervisor RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6895AALT-T | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。