参数资料
型号: TLV803RDBZR
厂商: TEXAS INSTRUMENTS INC
元件分类: 电源管理
英文描述: 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3
封装: PLASTIC, SOT-23, 3 PIN
文件页数: 10/13页
文件大小: 381K
代理商: TLV803RDBZR
V
DD
Transient
Amplitude
Duration
V
IT-
tw
RESET
V
DD
t
d
V
+V
IT
HYS
-
1.1V
ValidOutput
SBVS157A
– APRIL 2011 – REVISED JUNE 2011
APPLICATION INFORMATION
VDD TRANSIENT REJECTION
The TLV803 has built-in rejection of fast transients on the VDD pin. The rejection of transients depends on both
the duration and the amplitude of the transient. The amplitude of the transient is measured from the bottom of the
transient to the negative threshold voltage of the TLV803, as shown in Figure 7.
Figure 7. Voltage Transient Measurement
The TLV803 does not respond to transients that are fast duration/low amplitude or long duration/small amplitude.
Figure 4 shows the relationship between the transient amplitude and duration needed to trigger a reset. Any
combination of duration and amplitude above the curve generates a reset signal.
RESET DURING POWER UP/DOWN
The TLV803 output is valid when VDD is greater than 1.1 V. When VDD is less than 1.1 V, the output transistor
turns off and becomes high impedance. The voltage on the RESET pin rises to the voltage level connected to the
pull-up resistor. Figure 8 shows a typical waveform for power-up, assuming the RESET pin has a pull-up resistor
connected to the VDD pin.
Figure 8. Power-Up Response
6
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TLV803M TLV803R TLV803S TLV803Z
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