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PDF S8423 Data sheet ( Hoja de datos )
| Número de pieza | S8423 | |
| Descripción | Battery Backup IC | |
| Fabricantes | Seiko | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de S8423 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Contents
Features .............................................................. 1
Applications ......................................................... 1
Selection Guide ................................................... 1
Block Diagram ..................................................... 2
Pin Assignment ................................................... 2
Absolute Maximum Ratings ................................. 2
Electrical Characteristics ..................................... 3
Test Circuits ........................................................ 6
Operation Timing Charts (S-8423AFS)................ 7
Operation............................................................. 8
Transient Response ............................................ 10
Standard Circuit................................................... 19
Application Circuits .............................................. 20
Characteristics..................................................... 23
Dimensions, Taping............................................. 35
1 page  
BATTERY BACKUP IC
S-8423 Series
2. S-8423NFS/NFT
Parameter
Output voltage1
V
o
I/O voltage difference 1
l Load regulation 1
t
a Line regulation 1
g
e Temperature coefficient of
VRO
r Output voltage 2
e I/O voltage difference 2
g
u Load regulation 2
l
a Line regulation 2
t
o Temperature coefficient of
r VOUT
Input voltage of primary
power supply
CS detection voltage
CS release voltage
V RESET detection voltage
o
l RESET release voltage
t PREEND detection
a voltage
g PREEND release voltage
e
Operating voltage
d Temperature coefficient of
e detection voltage
t
e
c
t
o
r
Sink current
Leakage current
Switchover voltage
S CS output inhibit voltage
w M1 switch leakage
i current
t
c
h
M1 switch resistance
value
Temperature coefficient of
VSW1
Temperature coefficient of
VSW2
Current consumption
Input voltage of backup power
supply
Symbol
VRO
Vdif1
∆VRO1
∆VRO2
∆VRO
∆Ta
VOUT
Vdif2
∆VOUT1
∆VOUT2
∆VOUT
∆Ta
VIN
-VDET1
+VDET1
-VDET2
+VDET2
-VDET3
+VDET3
Vopr
∆-VDET1
∆Ta
∆-VDET2
∆Ta
∆-VDET3
∆Ta
ISINK
ILEAK
VSW1
VSW2
ILEK
RSW
∆VSW1
∆Ta
∆VSW2
∆Ta
ISS1
IBAT1
IBAT2
VBAT
Table 3
Conditions
VIN=3.6 V, IRO=15 mA
IRO=15 mA
VIN=3.6 V
IRO=100 µA to 20 mA
VIN=3.6 to 16 V
IRO=15 mA
Ta=-40°C to 85°C
VIN=3.6 V, IOUT=15 mA
IOUT=15 mA
VIN=3.6 V
IOUT=100 µA to 20 mA
VIN=3.6 to 16 V
IOUT=15 mA
Ta=-40°C to 85°C
(Unless otherwise specified : Ta=25 °C)
Min.
Typ.
Max.
Unit Test
cir.
3.135 3.200 3.268
V
60 180 mV
40 100 mV
38 100 mV
3.135
±0.46
3.200
20
50
3.268
60
110
mV/°C
V
mV
mV
1
50 110 mV
±0.46 mV/°C
Detects VIN
Detects VOUT
Detects VBAT
VIN or VBAT
Ta=-40°C to 85°C
3.234
3.315
2.351
2.457
-VDET2
+0.15
-VDET3
+0.11
2.0
3.300
3.400
2.400
2.528
-VDET2
+0.20
-VDET3
+0.14
±0.47
16
3.366
3.485
2.449
2.599
-VDET2
+0.25
-VDET3
+0.17
16
V
V
mV
V
V
V
V
V
mV/°C
2
Ta=-40°C to 85°C
±0.34 mV/°C
Ta=-40°C to 85°C
VDS=0.5V,
RESET
VIN=VBAT=
2.0V
PREEND
CS
VDS=16V, VIN=16V
VBAT=2.8 V
Detects VIN
VBAT=3 V
Detects VOUT
VIN=3.6 V
VBAT=0V
VIN=open,
VBAT=3V
Ta=-40°C to 85°C
1.50
1.50
1.50
+VDET1
×0.83
VOUT
×0.93
±0.37
2.30
2.30
2.30
+VDET1
×0.85
VOUT
×0.95
0.1
+VDET1
×0.87
VOUT
×0.97
1
mV/°C
mA
mA
mA
µA
V
V
µA
100 Ω
±0.41 mV/°C
3
4
5
6
7
4
Ta=-40°C to 85°C
VIN=3.6 V, Unloaded
VBAT=3 V
VIN=open
VBAT=3 V,
Ta=25°C
Unloaded
Ta=85°C
2.0
±0.43
28
0.26
1.0
43
0.50
2.1
3.5
4.0
mV/°C
µA
µA
µA
µA
V
5
8
7
4 Seiko Instruments Inc.
5 Page 
BATTERY BACKUP IC
S-8423 Series
(3) RESET voltage detector
RESET monitors the VOUT pin. The detection voltage can be selected between 2.0 V and 2.7 V by 0.1 V step. The result
of detection is output at the RESET pin: “L”for lower voltages than the detection level and “H” for higher voltages than
the release level. RESET outputs normal logic when VOUT terminal voltage is 1.0 V or more terminal
NOTE PREEND and RESET are detected at different pins. In practice, current is taken from the VBAT side, so consider
the I/O voltage difference (Vdif3) of M1 when M1 is turned on.
Input voltage
Release voltage
Detection voltage
Output voltage
Figure 7 Detection potentials of voltage detectors
n Transient Response
1. Line transient response against input voltage fluctuation
Input voltage fluctuation differs with the types of the signal applied: type I (square wave between 6.0 V and 10 V) and type II
(square wave from 0 V to 10 V) (see Figure 8). This section describes the ringing waveforms and parameter dependency of each
type. For reference, Figure 9 describes the measuring circuit.
Type I: Square wave between 6.0 V and 10 V
10 V
Input voltage 6.0 V
Output voltage
deviation
Overshoot
Type II: Square wave from 0 V to 10 V
Input voltage
0V
10 V
Output voltage
deviation
Overshoot
Undershoot
Figure 8
Undershoot
Fast amplifier
P.G
VIN VOUT
S-8423
VSS
COUT
Oscilloscope
RL
Figure 9 Measuring circuit
10 Seiko Instruments Inc.
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet S8423.PDF ] | |
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