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L9704D 데이터시트 PDF




STMicroelectronics에서 제조한 전자 부품 L9704D은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 L9704D 기능
기능 OCTAL SUPPLY CONTACT MONITORING CIRCUIT
제조업체 STMicroelectronics
로고 STMicroelectronics 로고


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L9704D 데이터시트, 핀배열, 회로
L9704
OCTAL SUPPLY CONTACT MONITORING CIRCUIT
. OPERATING DC SUPPLY VOLTAGE RANGE
5V TO 25V
. SUPPLY OVERVOLTAGE PULSE UP TO 40V
. VERY LOW STANDBY QUIESCENT CUR-
RENT 0.2mA
. INTERNAL CLAMPING DIODES AT CONTACT
INPUTS TO VS AND GND
. INPUT PULSE CURRENT CAPABILITY UP TO
+ 50mA, – 75mA
. NOMINAL CONTACT CURRENTS OF 10mA
. DEFINED BY EXTERNAL CONTACT SERIES
RESISTORS RIN1-8
CONTACT STATUS MONITORING BY COM-
PARING THE RESISTANCE AT CONTACT
. SENSEINPUTS WITH THEINTERNAL REFER-
ENCE RESISTOR VALUE
HIGH IMMUNITY DUE TO RESISTANCE COM-
PARISON WITH HYSTERESIS
DIP–20
SO–20L
DESCRIPTION
ORDERING NUMBERS: L9704 (DIP–20)
L9704D (SO–20L)
The L9704 is a bipolar monolithic integrated circuit
for monitoring the status of up to eight contactscon-
nected to the power supply (battery).
It contains eight contact sense inputs and eight mi-
crocomputer compatible three-state outputs.
BLOCK DIAGRAM
March 1992
1/8




L9704D pdf, 반도체, 판매, 대치품
L9704
APPLICATION CIRCUIT DIAGRAM
Figure 1 : Typical application diagram for the L9704 circuit. The current flowing in the arrow direction is as-
sumed positive. The external capacitors CIN and COUT represent the total wiring capacitance at
the corresponding pins.
FUNCTIONAL DESCRIPTION
The L9704 circuit monitors the status of the contacts
connectedto battery and through the series external
resistors RIN to the contact sense input pins. The
contacts equivalent circuit is supposed to be as
shown in fig. 2.
The L9704 circuit compares the input current with
the current through the internal reference resistor.
The device is designed to work with an externalinput
series resistor of RIN1-8 =1k. With this input resistor
the contact current, when the contact is closed and
the device activated (EN = LOW) is
IIN =
VBAT + VBAT – 2V
1K
(1)
For this calculation the limit value of the VIN (satura-
tion voltage of 2V) was consideredso that thelowest
limit value of IIN is calculated in (1).
The function of the circuit can be demonstratedwith
the transfer characteristics, showing the output
status as a function of the input resistor RI, shown
in figure 3. The input resistor is a sum of the RIN and
the contactresistance RCON or RCOFF, for the closed
contact :
RI = RIN + RCON,
(2)
and for the open contact :
RI = RIN + RCOFF.
(3)
The output goes HIGH when the input resistance in-
creases above 6.5k(typical value) and goesLOW,
when the input resistance decreases below 4.8K
(typical value). The limit values of RI = 1.1Kfor
LOW and RI = 29kfor HIGH implies that a contact
with RCON = 100(at IIN = 10mA) will be recognized
as ON = LOW and a contact with RCOFF = 28kwill
be recognized as OFF = HIGH. These limits are
valid within the supply voltage range 5V Vs 16V,
the battery voltage potential difference of
VBAT ≤ 0.1VBAT and the variation of the reverse
battery protection diode D1 voltage from 0.5V to 1V.
4/8

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L9704D 전자부품, 판매, 대치품
DIP20 PACKAGE MECHANICAL DATA
DIM.
a1
B
b
b1
D
E
e
e3
F
I
L
Z
MIN.
0.254
1.39
mm
TYP.
0.45
0.25
8.5
2.54
22.86
3.3
MAX.
1.65
25.4
7.1
3.93
1.34
MIN.
0.010
0.055
inch
TYP.
0.018
0.010
0.335
0.100
0.900
0.130
L9704
MAX.
0.065
1.000
0.280
0.155
0.053
7/8

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관련 데이터시트

부품번호상세설명 및 기능제조사
L9704

OCTAL SUPPLY CONTACT MONITORING CIRCUIT

STMicroelectronics
STMicroelectronics
L9704D

OCTAL SUPPLY CONTACT MONITORING CIRCUIT

STMicroelectronics
STMicroelectronics

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