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IL2533N Datasheet(PDF) 5 Page - Integral Corp.

Part # IL2533N
Description  MULTISTANDARD CMOS IC OF SINGLE CHIP PHONE WITH DOUBLE SOFT LIMITATION
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Manufacturer  INTEGRAL [Integral Corp.]
Direct Link  http://www.iksemi.com/
Logo INTEGRAL - Integral Corp.

IL2533N Datasheet(HTML) 5 Page - Integral Corp.

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IL2533
KEYBOARD CONNECTING
Keyboard connecting is shown at figure 3.
Key closed, RON MAX = 1 Ohm
Key opened, ROFF MIN = 1 Ohm
P/M
1
2
3
4
5
6
7
8
9
0
*
#
R1
R2
R3
LNR
VOL
+
-
A
B
C
D
RP
PS
T/P
M1
M2
M3
M4
MR
C1
C2
C3
C4
R1
R2
R3
R4
Figure 3 – Keyboard connecting
Power-up set up
On-chip voltage on preset circuit traces supply voltage VDD during receiver off-hook.
When VDD increase reaches level approximately 1.2 V, preset circuit empties RAM.
Direct current conditions
Typical operational range is from 13 to 100 mА. Operational range by lowered effectiveness
is from 5 to 13 mА (parallel operation). In operational range all functions are active.
By line currents lower than 13 mА microcircuit provides additional decrease lower than 4.5 V
in order to allow parallel operation (see fig. 4).
Direct current characteristic (excluding diode bridge) determining by voltage to LI and R1
resistor by line currents higher than 13 mА by following form:
VLS = VLI + ILINE × R1
(1). Voltage at LI is 4.5 V in typical operational range. In dialing mode, speech scheme and
inactive device parts is in mode of decreased power consumption with the purpose of current
saving. CS output pulls up to Vss in order to connect outer shunting transistor for supporting of low
voltage at LS output within periods forming.
IMPEDANCE FOR ALTERNATING CURRENT
Circuit impedance on alternating current is adjusting by outer components. Impedance can
be actual and complex. Alternating-current resistance ZAC, Ohm, is determining according to
following form
ZAC = 33 × Z1
5


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