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Электронный компонент: IN1705D

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IN1705D
1
P
OWER SUPPLY CHECK MICROCIRCUIT WITH HOST PRIMARY SUPPLY
MONITORING CIRCUIT
IN1705D microcircuit is purposed to check power supply and to start up microcontroller
and microprocessor systems. It is applied to ensure regular standard operation of the circuit
when the device is switched on\off and also when there is alarm emergency dropping of
supply voltage.
Physically the microcircuit is made in 8-pin SO-package MS012AA.

LSIIC Characteritics:
Standard supply voltage
5,0
Operation temperature range
A
= from -40
to +85
RESET signal generation when power supply is provided for regular start-up of
microprocessor
RESET signal generation when power supply is dropped below operation one to exclude
incorrect operation of microprocessor.
RESET signal generation when reset key is pressed
Option of threshold voltage programming when RESET signal is generated

Microcircuit includes:
reference voltage source
two
analog
comparators
guard timer
digitizer, (digital sampler)
digital delay

Functions performed
RESET signal generation by fixed supply voltage level
RESET signal generation from external RESET key
Generation of guard timer state signal
Alarm interrupt of host power supply
Architecture diagramme
Reference
voltage
source
____
RST
IN
Ucc
______
PBRST
+
-
-
+
Digitizer
Digitizer
Digital
delay
Guard timer
____
WDS
____
NMI
Schmitt trigger
__
ST
Microcircuit pins' purpose
Pins' designation in package
IN1705D
2
Pin
Symbol
Name
Type
01
______
PBRST

Reset form external key
Input
02
Ucc

Supply voltage pin
-
03
GND

Common pin
-
04
IN

Host source check
Input
05
____
NMI

Non-masked interrupt
Output
06
__
ST

Guard timer strobe
Input
07
____
RST

Reset actibe low
Output
08
____
WDS

Guard timer state
Output
Operation temperature range
Operation temperature range -40
+85
.
Limiting\tolerable conditions
Parameter
Symbol
Name Norm
not less not more
Units
U
Supply voltage
4,5
5,5
V
U
IH
High level input voltage
2,0
U
+0,3 V
U
IL
Low level input voltage
-0,03
0,5
V
A
Operation
temperature range
-40
+85
Tolerable conditions
Parameter
symbol
Name Norm
not less not more
Unit
U
Supply
voltage
-0,5 7,0
V
U
IH
High level input voltage
-
U
+0,5 V
U
IL
Low level input voltage
-0,5
-
V
T
stg
Storage
temperature
-60 +125
IN1705D
3
Microcircuit serviceability is not guaranteed when limiting conditions are applied. After
limiting conditions are withdrwn the serviceability will be guaranteed in limiting tolerable
condition.
Static parameters
Parameter
symbol
Nme Measurement
conditons
Norm Units
not less
not more
U
IL
Low level input voltage U
=from 4,5 to
5,5V
- 0,5
V
U
IH
High level input voltage U
=from 4,5 to
5,5V
2,0
V
I
OL
Low level output
current
U
=from 4,5 to
5,5V U
OL
=0,4V
10,0 - m
U
OH
High level output voltage U
=from 4,5 to
5,5 I
OH
=-500
mk
U
-0,3 -
V
-I
LIL
Low level input leakage
current (IN)
U
=from 4,5 to
5,5V U
I
=U
or
U
SS
- 1,0
mk
-I
LIL
Low level input leakage
current (ST)
U
=from 4,5 to
5,5V U
I
=U
or
U
SS
10 100 mk
-I
LIL
Low level input leakage
current (PBRST)
U
=from 4,5 to
5,5 U
I
=U
orU
SS
50 450 mk
I
LIH
High level input
leakage current
U
=from 4,5 to
5,5V U
I
=U
or
U
SS
- 1,0
mk
I
Dynamic
consumption
current
U
=from 4,5 to
5,5V U
IL
= U
SS
,
U
IH
=U
CC
- 60
mk
U
CCTP
Source
voltagewhen
reset signal is
generated
U
=from 4,5 to
5,5V U
IL
= U
SS
,
U
IH
=U
CC
4,5 4,75 V
U
TP
IN input voltage when
interrupt is
generatedop
U
=from 4,5 to
5,5V U
IL
= U
SS
,
U
IH
=U
CC
1,2 1,3 V
IN1705D
4
Dynamic parameters
Parameter Name
Norm
Unit
symbol
not less
not more
t
TD
Guard timer reflow time
1,0
2,2
s
t
PDLY
Setting time for reset by PBRST
signal
- 250 ns
t
RST
Reset hold-in time by PBRST signal
130
285 ms
t
RPD
Setting time for reset by U
-
8,0 mks
t
RPU
Hold-in time for reset by U
130
285 ms
t
IPD
Interrupt setting time for IN input
-
8,0
mks
t
PB
Key press duration
(PBRST= U
IL
)
150 - ns
t
ST
Strobe pulse width
10
-
ns

Time diagrammes
______
PBRST
U
IL
U
IH
____
RST
t
RST
t
PB
t
PDLY
U
OH
Fig.1 - Time diagramme of generation guard timer state signal.
___
ST
____
WDS
t
TD
MIN
.
MAX.
Unreal strobe
Real strobe
Undefined strobe
t
ST
___
RST
Key initiated reset
Fig.2 - Time diagramme of generation guard timer state signal (strobed input)
U
= from 4,5 to 5,5V,
A
= from -40
to+85
IN1705D
5
t
F
t
RPD
U
OL
U
CCTP (MAX)
U
CCT
P
U
CCTP (MIN)
U
CC
____
RST
____
WDS
____
WDS fall from U
CC
Fig. 3 - Time diagram of generation reset signal when power supply is dropped up to Ustrobe
(power supply error)