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ML145407 Datasheet(PDF) 6 Page - LANSDALE Semiconductor Inc.

No. de pieza ML145407
Descripción Electrónicos  5 Volt Only Driver
Download  8 Pages
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Fabricante Electrónico  LANSDALE [LANSDALE Semiconductor Inc.]
Página de inicio  http://www.lansdale.com
Logo LANSDALE - LANSDALE Semiconductor Inc.

ML145407 Datasheet(HTML) 6 Page - LANSDALE Semiconductor Inc.

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Page 6 of 8
Issue A
LANSDALE Semiconductor, Inc.
ML145407
ESD CONSIDERATIONS
ESD protection on IC devices that have their pins accessible
to the outside world is essential. High static voltages applied to
the pins when someone touches them either directly or indi-
rectly can cause damage to gate oxides and transistor junctions
by coupling a portion of the energy from the I/O pin to the
power supply busses of the IC. This coupling will usually
occur through the internal ESD protection diodes. The key to
protecting the IC is to shunt as much of the energy to ground
as possible before it enters the IC. Figure 7 shows a technique
which will clamp the ESD voltage at approximately + 15 V
using the MMBZ15VDLT1. Any residual voltage which
appears on the supply pins is shunted to ground through the
0.1 µF capacitors.
OPERATION WITH SMALLER VALUE CHARGE
PUMP CAPS
The ML145407 is characterized in the electrical tables using
10 µF charge pump caps to illustrate its capability in driving a
companion ML145406 or ML145403. If there is no require-
ment to support a second interface device and/or the charge
pump is not being used to power any other components, the
ML145407 is capable of complying with EIA–232–E and V.28
with smaller value charge pump caps.Table 1 summarizes driv-
er performance with both 2.2 µF and1.0µF charge pump caps.
14
600
16
TIP
13
BYPASS
DTMF
INPUT
RDSI
20 k
CDSI RTLA
+ 5 V
20
6
9
8
3
11
5
TLA
DSI
TxA
RxA2
1
17
15
VDD
Xin
Xout
CD
TxD
RxD
SQT
LB
MODE
CDA
VSS
CDT
VAG
FB
ExI
RxA1
RTx
18
10
19
4
600:600
CFB
+
10 k
RING
VDD
VDD
BYPASS
VSS
CCDT
12
7
2
10 k
10 k
10 k
0.1
µF
0.1
µF
0.1
µF
0.1
µF
0.1
µF
0.1
µF
10
µF
1.0
µF
3.579
MHz
CCDA
3
1
15
16
13
17
19
6
5
8
7
9
8
2
3
7
2
4
VSS
GND
DI3
DI2
DO1
DI1
C2 +
C2 – VDD
VCC C1 –
C1 +
Tx1
Rx1
Tx2
Rx2
Rx3
* Line protection circuit
ML145442
OR
ML145443
ML145407
1.0
µF
1.0
µF
1.0
µF
+
EIA–232–E
DB–25
CONNECTOR
0.1
µF
0.1
µF
0.1
µF
*
Figure 4. 5 V, 300 Baud Modem with EIA–232–E Interface
Table 1. Typical Performance
Parameter
2.2
µF
1.0
µF
Tx VOH @ 25°C
7.3
7.2
Tx VOH @ 85°C
7.2
7.1
Tx VOL @ 25°C
– 6.5
– 6.4
Tx VOL @ 85°C
– 6.1
– 6.0
Tx Slew Rate @ 25
°C
8.0 V/
µs
8.0 V/
µs
Tx Slew Rate @ 85
°C
7.0 V/
µs
7.0 V/
µs


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