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参数资料
| 型号： | MAX837EUS-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/7页 |
| 文件大小： | 0K |
| 描述： | IC V-MONITOR MICROPOWER SOT143-4 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 标准传输延迟为 80 µs |
| 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： | TO-253-4，TO-253AA |
| 供应商设备封装： | SOT-143-4 |
| 包装： | 剪切带 (CT) |
| 其它名称： | MAX837EUS-TCT |
4-Pin Micropower Voltage Monitors
_____________________________Typical Operating Characteristics (continued)
(V CC = +5V, R LOAD = 1M Ω , R PULLUP = 10k Ω (MAX836 only), T A = +25°C, unless otherwise noted.)
160
V CC FALLING PROPAGATION DELAY
vs. TEMPERATURE
1800
OUT RISE/FALL-TIME
vs. SUPPLY VOLTAGE
140
120
1mV/ μ s
V TRIP = 4.63V
1600
1400
1200
100
80
10mV/ μ s
V TRIP = 3.0V
V TRIP = 4.63V
1000
800
600
RISE TIME
MAX837 ONLY
FALL TIME
400
60
40
V TRIP = 3.0V
200
0
-60
-40
-20
0
20
40
60
80
100
2
3
4
5
6
7
8
9
10
11 12
TEMPERATURE ( ° C)
_____________________Pin Description
V CC (V)
Detailed Description
PIN
1
2
3
4
NAME
GND
V CC
IN
OUT
FUNCTION
System Ground
System Supply Input
Noninverting Input to the Comparator.
The inverting input connects to the
internal 1.204V bandgap reference.
Open-Drain (MAX836) or
Push-Pull (MAX837) Output
The MAX836/MAX837 micropower voltage monitors
contain a 1.204V precision bandgap reference and a
comparator (see the Typical Operating Circuit). The
only difference between the two parts is the structure of
the comparator output driver. The MAX836 has an
open-drain n-channel output driver that can be pulled
up to a voltage higher than V CC , but under 11V. The
MAX837’s output is push-pull, and can both source
and sink current.
Programming the Trip Voltage
Two external resistors set the trip voltage, V TRIP (Figure 1).
V TRIP is the point at which the applied voltage (typically
V CC
V CC ) toggles OUT. The MAX836/MAX837’s high input
impedance allows large-value resistors without compro-
R1 = R2 ? TRIP - 1 ?
GND
MAX836
OUT
R PULLUP
mising trip-voltage accuracy. To minimize current con-
sumption, select a value for R2 between 500k Ω and
1M Ω , then calculate R1 as follows:
? V ?
? V TH ?
V CC
0.1 μ F
V CC
IN
where V TRIP = desired trip voltage (in volts), V TH =
threshold trip voltage (1.204V).
Applications Information
V TRIP = (1.204) R1 + R2
R2
R1
R2
Adding Hysteresis
Hysteresis adds noise immunity to the MAX836/MAX837
NOTE: UNITS ARE OHMS AND VOLTS
Figure 1. Programming the Trip Voltage, V TRIP
and prevents repeated triggering when V IN is near the
threshold trip voltage. Figure 2 shows how to add hys-
teresis to the comparator. The technique is similar for
4
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