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S-1000C27-M5T1G Datasheet(PDF) 16 Page - Seiko Instruments Inc

Part # S-1000C27-M5T1G
Description  ULTRA-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR
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Manufacturer  SII [Seiko Instruments Inc]
Direct Link  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S-1000C27-M5T1G Datasheet(HTML) 16 Page - Seiko Instruments Inc

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ULTRA-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR
S-1000 Series
Rev.2.3_00
16
Seiko Instruments Inc.
Detection voltage range
Detection voltage
VDD
(
−VDET) Min.
(
−VDET) Max.
OUT
Release voltage
Release voltage range
VDD
(
+VDET) Min.
(
+VDET) Max.
OUT
Figure 18 Detection voltage (CMOS output products)
Figure 19 Release voltage (CMOS output products)
2. Hysteresis width (VHYS)
The hysteresis width is the voltage difference between the detection voltage and the release voltage (The voltage at point
B
− The voltage at point A = VHYS in Figure 15). The existence of the hysteresis width prevents malfunction caused by
noise on input signal.
3. Through-type current
The through-type current refers to the current that flows instantaneously at the time of detection and release of a voltage
detector. The through-type current is large in CMOS output products, small in Nch open-drain output products.
4. Oscillation
In applications where a resistor is connected to the voltage detector input (Figure 20), taking a CMOS active “L” product
for example, the through-type current which is generated when the output goes from “L” to “H” (release) causes a voltage
drop equal to [through-type current]
× [input resistance] across the resistor. When the input voltage drops below the
detection voltage (
−VDET) as a result, the output voltage goes to low level. In this state, the through-type current stops
and its resultant voltage drop disappears, and the output goes from “L” to “H”. The through-type current is then
generated again, a voltage drop appears, and repeating the process finally induces oscillation.
OUT
VSS
VDD
RB
RA
VIN
S-1000C
Figure 20 An example for bad implementation of input voltage divider


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