S-19400/19401 Series
www.sii-ic.com
© Seiko Instruments Inc., 2014-2015
FOR AUTOMOTIVE 125°C OPERATION LOW CURRENT CONSUMPTION
WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.2
_00
The S-19400/19401 Series is a watchdog timer developed using CMOS technology, which can operate with low current
consumption of 3.8
μA
typ. The reset function and the low voltage detection function are available.
Caution
This product can be used in vehicle equipment and in-vehicle equipment. Before using the product in
the purpose, contact to SII is indispensable.
Features
•
Detection voltage:
•
Detection voltage accuracy:
•
Input voltage:
•
Hysteresis width:
•
Current consumption:
•
Reset time-out period:
•
Watchdog operation is switchable:
•
Watchdog operation voltage range:
•
Watchdog mode switching function
*1
:
•
Watchdog input edge is selectable:
•
Product type is selectable:
2.0 V to 5.0 V, selectable in 0.1 V step
±2.0%
V
DD
= 0.9 V to 6.0 V
5% typ.
3.8
μA
typ.
14.5 ms typ. (C
POR
= 2200 pF)
Enable, Disable
2.5 V to 6.0 V
Time-out mode, window mode
Rising edge, falling edge, both rising and falling edges
S-19400 Series
___
________
(Product with W / T pin (Output: WDO pin))
S-19401 Series
___
_______
________
(Product without W / T pin (Output: RST pin, WDO pin))
Ta =
−40°C
to
+125°C
•
Operation temperature range:
•
Lead-free (Sn 100%), halogen-free
•
AEC-Q100
qualified
*2
*1.
*2.
The S-19401 Series is fixed to the window mode.
Contact our sales office for details.
Applications
•
For automotive use (engine, transmission, suspension, ABS, related-devices for EV / HEV / PHEV, etc.)
Package
•
TMSOP-8
Seiko Instruments Inc.
1
FOR AUTOMOTIVE 125°C OPERATION LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.2
_00
S-19400/19401 Series
Block Diagrams
1.
S-19400 Series (Product with W / T pin)
CWDT
VDD
WEN
WDI
W/T
Noise
filter
Noise
filter
Noise
filter
WDO
Voltage detection
circuit
WDT circuit
____
Reference
voltage
circuit
VSS
CPOR
Figure 1
2.
S-19401 Series (Product without W / T pin)
CWDT
____
VDD
WEN
WDI
Noise
filter
Noise
filter
WDT circuit
RST
WDO
Reference
voltage
circuit
VSS
Voltage detection
circuit
CPOR
Figure 2
2
Seiko Instruments Inc.
FOR AUTOMOTIVE 125°C OPERATION LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.2
_00
S-19400/19401 Series
AEC-Q100 Qualified
This IC supports AEC-Q100 for operation temperature grade 1.
Contact our sales office for details of AEC-Q100 reliability specification.
Product Name Structure
Users can select the product types, detection voltage for the S-19400/19401 Series. Refer to "1.
Product name"
regarding the contents of product name, "2.
Product type list"
regarding the product types, "3.
Package"
regarding
the package drawings.
1.
Product name
S-1940
x
x
xx
A -
K8T2
U
4
Environmental code
U:
Lead-free (Sn 100%), halogen-free
Package abbreviation and IC packing specifications
*1
K8T2: TMSOP-8, Tape
Operation temperature
A:
Ta =
−40°C
to
+125°C
Detection voltage
20 to 50
(e.g., when the detection voltage is 2.0 V, it is expressed as 20.)
Product type 1
*2
A to L
Product type 2
0, 1
*1.
*2.
*3.
*3
Refer to the tape drawing.
Refer to "2.
Product type list".
___
0: S-19400 Series (Product with W / T pin)
________
The WDO pin outputs the signals which are from the watchdog timer circuit and the voltage detection
circuit.
___
1: S-19401 Series (Product without W / T pin)
________
The WDO pin outputs the signals which are from the watchdog timer circuit and the voltage detection
circuit.
_______
The RST pin outputs the signal which is from the voltage detection circuit.
The watchdog mode is fixed to the window mode.
Seiko Instruments Inc.
3
FOR AUTOMOTIVE 125°C OPERATION LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.2
_00
S-19400/19401 Series
2.
Product type list
Product Type
A
B
C
D
E
F
G
H
I
J
K
L
WEN Pin Logic
Active "H"
Active "H"
Active "H"
Active "L"
Active "L"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "L"
Active "L"
Table 1
Input Edge
Rising edge
Falling edge
Both rising and falling edges
Rising edge
Falling edge
Both rising and falling edges
Rising edge
Falling edge
Both rising and falling edges
Rising edge
Falling edge
Both rising and falling edges
Output Pull-up Resistor
Available
Available
Available
Available
Available
Available
Unavailable
Unavailable
Unavailable
Unavailable
Unavailable
Unavailable
3.
Package
Table 2
Package Name
TMSOP-8
Package Drawing Codes
Tape
FM008-A-C-SD
Reel
FM008-A-R-SD
Dimension
FM008-A-P-SD
4
Seiko Instruments Inc.
FOR AUTOMOTIVE 125°C OPERATION LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.2
_00
S-19400/19401 Series
Pin Configuration
1.
TMSOP-8
Top view
1
2
3
4
8
7
6
5
___
Table 3
Pin No.
S-19400 Series (Product with W / T pin)
___
Figure 3
*1.
Symbol
Description
*1
W /T
1
Watchdog mode switching pin
2
CPOR
Reset time-out period adjustment pin
3
CWDT
Watchdog time adjustment pin
4
VSS
GND pin
5
WEN
Watchdog enable pin
________
WDO
6
Watchdog output pin
7
WDI
Watchdog input pin
8
VDD
Voltage input pin
___
W / T pin = "H": Time-out mode
___
W / T pin = "L": Window mode
Table 4
Pin No.
1
2
3
4
5
6
7
8
S-19401 Series (Product without W / T pin)
Symbol
RST
CPOR
CWDT
VSS
WEN
________
WDO
WDI
VDD
_______
___
Description
Reset output pin
Reset time-out period adjustment pin
Watchdog time adjustment pin
GND pin
Watchdog enable pin
Watchdog output pin
Watchdog input pin
Voltage input pin
Seiko Instruments Inc.
5
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