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PDF L9704D Data sheet ( Hoja de datos )
| Número de pieza | L9704D | |
| Descripción | OCTAL SUPPLY CONTACT MONITORING CIRCUIT | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L9704D (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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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
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1 page  
L9704
The internal clamping diodes at the contact monitor-
ing inputs, together with the external contact series
resistors RIN, allows the device to withstand tran-
sients at the contact connection.The contact series
resistor RIN limits the input current at the transient.
The dynamic behaviour of the circuit is defined by
the times tdo and tdTS. When the contact becomes
open, the input capacitor CIN must be charged
through the resistor RIN. In this case the total delay
time may also be influenced by the time constant RIN
CIN. The delay time tdTS, when disabling the device
is defined only by the internal circuitry. In bothcases,
an externaloutput capacitanceless than 50pF is as-
sumed, the internal output capacitances of the
three-state buffers are less than 5pF.
Figure 2 : The Contact Sense Input Connection with the Contact Equivalent Circuit.
Figure 3 : The Output Voltage as a Function of the Input Resistance at the Corresponding Contact Sense
Input.
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet L9704D.PDF ] | |
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