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参数资料
| 型号： | LTC1326IS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC PREC TRPL SUPPLY MONITR 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 3 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 3.118V，4.725V，可调 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
LTC1326/LTC1326-2.5
APPLICATIO S I FOR ATIO
Figure 3 contains a simple circuit for 5V systems that can’t
risk the RST output going high in the 3.1V to 4.15V range
(possibly due to very slow rise time on the 5V supply).
Diode D1 powers the LTC1326 while dropping ≈ 0.6V from
the V CC5 pin to the V CC3 pin. This prevents the part’s
internal override circuit from being activated. Without the
override circuit active, the RST pin stays low until V CC5
reaches V RT5 ? 4.725V (See Figure 4).
LTC1326-2.5 Override Functions
The V CCA pin, if unused, can be tied to either V CC3 or V CC25 .
This is an obvious solution since the trip points for V CC3
and V CC25 will always be greater than the trip point for
V CCA . Likewise, the V CC25 , if unused, can be tied to V CC3 .
V CC3 must always be used. Tying V CC3 to V CC25 and
operating off of a 2.5V supply will result in the continuous
assertion of RST.
5V
D1*
0.1 μ F
1
2
3
4
LTC1326
V CC3 PBR
V CC5 SRST
V CCA RST
GND RST
8
7
6
5
4.7k
SYSTEM RESET
Extending ESD Tolerance on the PBR Input Pin
The PBR pin is susceptible to ESD since it may be brought
out to a front panel in normal applications. The ESD
tolerance of this pin can be increased by adding a resistor
in series with the PBR pin. A 10k resistor can increase the
*MMBD914 OR EQUIVALENT
1326 /2.5 F03
ESD tolerance of the PBR pin to approximately 10kV. The
PBR’s internal pull-up current of 7 μ A typical means there
Figure 3. LTC1326 Monitoring a Single 5V Supply.
D1 Used to Avoid RST High Near 3.3V to 4V (See
is only 70mV (150mV max) dropped across the resistor.
See Figure 5.
Figure 2).
5
4
V CC5 = V CCA = 0V TO 5V
4.7k PULL-UP FROM RST TO V CC5
T A = 25 ° C
ADJUSTABLE SUPPLY
OR DC/DC FEEDBACK
DIVIDER
R1
3.3V
2.5V
R2
1
2
3
4
LTC1326-2.5
V CC3 PBR
V CC25 SRST
V CCA RST
GND RST
8
7
6
5
PUSH-BUTTON
RESET
10k*
SYSTEM RESET
3
*OPTIONAL RESISTOR EXTENDS ESD TOLERANCE OF PBR INPUT TO APPROXIMATELY 10kV
2
1
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Figure 5. Triple Supply Monitor (3.3V, 2.5V
and Adjustable) with Extended ESD Tolerance
1326 /2.5 F05
V CC5 (V)
1326/2.5 F04
Figure 4. RST Output Voltage
Characteristics of the Circuit in Figure 3
132625fc
10
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