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LT1537 Datasheet(PDF) 6 Page - Linear Technology

Part No. LT1537
Description  Advanced Low Power 5V RS232 Transceiver with Small Capacitors
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1537 Datasheet(HTML) 6 Page - Linear Technology

   
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6
LT1537
PI FU CTIO S
RX IN: Receiver Inputs. These pins accept RS232 level
signals (
± 25V) into a protected 5k terminating resistor.
The receiver inputs are protected against ESD to
±5kV for
human body model discharges. Each receiver provides
0.4V of hysteresis for noise immunity. Open receiver
inputs assume a logic low state.
RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev-
els. Outputs are in a high impedance state when in shut-
down mode to allow data line sharing. Outputs are fully
short-circuit protected to ground or VCC with the power
on, off, or in shutdown mode.
ESD PROTECTIO
The RS232 line inputs of the LT1537 have on-chip protec-
tion from ESD transients up to
±5kV during shutdown or
power ON state. The protection structures act to divert the
static discharge safely to system ground. In order for the
ESD protection to function effectively, the power supply
and ground pins of the LT1537 must be connected to
ground through low impedances. The power supply
decoupling capacitors and charge pump storage capaci-
tors provide this low impedance in normal application of
the circuit. The only constraint is that low ESR capacitors
must be used for bypassing and charge storage. ESD
testing must be done with pins VCC, V+, V and GND
shorted to ground or connected with low ESR capacitors.
TYPICAL APPLICATIO S
LT1537 Driving Remote Powered LTC1382
LT1537
LTC®1382
5.1V
ON/OFF = 5V
2
× 0.1µF
2
× 0.1µF
VCC
V+
V
V+
V
0.1
µF
0.1
µF
0.1
µF
0.1
µF
0.1
µF
0.1
µF
0.1
µF
VCC
DRIVER
RS232 OUTPUT
DRIVER
RECEIVER
RECEIVER
DRIVER
LOGIC
INPUT
LOGIC
OUTPUT
RECEIVER
RECEIVER
DRIVER
RS232 OUTPUT
LOGIC
OUTPUT
LOGIC
INPUT
THREE
RECEIVERS
NOT USED
ON/OFF = 5V
0.1
µF
LT1537 • TA03
DRIVER
+
+
+
+
+
+
ESD Test Circuit
LT1537 • ESD TC
5V VCC
0.1
µF
0.2
µF
0.1
µF
RS232
LINE PINS
PROTECTED
TO
±5kV
LT1537
1
2
3
4
5
6
7
8
9
10
11
12
13
14
DRIVER 1 OUT
RX1 IN
DRIVER 2 OUT
RX2 IN
RX3 IN
RX4 IN
DRIVER 3 OUT
RX5 IN
ON/OFF
28
27
26
25
24
23
22
21
20
19
18
17
16
15
0.2
µF
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT
+
V
V+
+
+
0.1
µF
GND
DRIVER DISABLE


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