s-80857cny-n-g Seiko Instruments Inc., s-80857cny-n-g Datasheet - Page 26

• Manufacturer Part Number: s-80857cny-n-g
• Description: Super-small Package High-precision Voltage Detector
• Manufacturer: Seiko Instruments Inc.

Figure 21 Detection Voltage (CMOS Output Products)
26
SUPER-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR
S-808xxC Series
(−V
(−V
2. Hysteresis Width (V
3. Through-type Current
4. Oscillation
DET
DET
Remark Although the detection voltage and release voltage overlap in the range of 1.514 V to 1.530 V,
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 =V
prevents malfunction caused by noise on input signal.
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.
In applications where a resistor is connected to the voltage detector input ( Figure 23 ), taking a CMOS active
low product for example, the through-type current which is generated when the output goes from low to high
(release) causes a voltage drop equal to [through-type current]×[input resistance] across the resistor. When
the input voltage drops below the detection voltage (−V
In this state, the through-type current stops and its resultant voltage drop disappears, and the output goes
from low to high. A through-type current is again generated, a voltage drop appears, and repeating the
process finally induces oscillation.
) Max.
) Min.
V
DD
+V
DET
OUT
Figure 23 An Example for Bad Implementation of Input Voltage Divider
is always larger than −V
HYS
Detection voltage
)
Detection voltage range
VDD
VSS
R
R
Seiko Instruments Inc.
A
B
DET
.
HYS
V
IN
in Figure 18 ). The existence of the hysteresis width
S-808xxCL
Figure 22 Release Voltage (CMOS Output Products)
(+V
(+V
DET
DET
DET
) as a result, the output voltage goes to low level.
Release voltage
) Max.
) Min.
OUT
OUT
Release voltage range
V
Rev.5.0
DD
_00