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S-5470D21I-M5T1U Datasheet(PDF) 9 Page - Seiko Instruments Inc

Part # S-5470D21I-M5T1U
Description  ULTRA-LOW CURRENT CONSUMPTION
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Manufacturer  SII [Seiko Instruments Inc]
Direct Link  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S-5470D21I-M5T1U Datasheet(HTML) 9 Page - Seiko Instruments Inc

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ULTRA-LOW CURRENT CONSUMPTION NORMALLY-OFF FAINT SIGNAL DETECTION IC
Rev.1.3_01
S-5470 Series
9
Operation
The S-5470 Series detects either certain current level or the difference of current level.
The operation of the S-5470 Series is described below, using CMOS output and active "H" products as examples.
1. Basic operation when detecting certain current level (INM pin = VSS)
The S-5470 Series operates as follows when the INM pin is connected to VSS pin.
(1) If IINP is lower than IDET, an "L" level signal is output from the OUT pin.
(2) If IINP increases and becomes equal to or higher than IDET, an "H" level signal is output from the OUT pin (point
A in Figure 14). Even if IINP decreases and falls below IDET, as long as IINP is higher than IREL, an "H" level
signal is output from the OUT pin.
(3) If IINP then decreases further and becomes equal to or lower than IREL, an "L" level signal is output from the
OUT pin (point B in Figure 14).
Remark
IINP: Current input to the INP pin
IDET: Detection current (refer to "4. 1 Detection current (IDET)")
IREL: Release current (refer to "4. 2 Release current (IREL)")
Caution 1.
There are internal diodes at the INP pin and the INM pin. Therefore, in order to input a current
to the INP pin and the INM pin, an input voltage of at least the forward voltage of these diodes
is required.
2. Feed-through current (IPEAK = 100 nA) flows around the time when the OUT pin voltage switches,
as shown in Figure 14. Therefore, if the input current is fixed around this time, the current
consumption will increase.
OUT
*1
*1
+
INP
INM
*1
*1
IDET
IINP
+
VDD
VSS
*1
Current
comparator
Current
amplifier
Current
adder
IINP
*1.
Parasitic diode
Figure 13 Diagram of the Operation when Detecting Certain Current Level
IINP
H
L
Current consumption (IDD)
IPEAK = 100 nA
OUT pin output voltage
(VOUT)
IDET
IREL
Hysteresis width
B
A
(3)
(1)
(2)
Figure 14 Operation when Detecting Certain Current Level


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