LT1537C LINER [Linear Technology], LT1537C Datasheet - Page 6
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LT1537C
Manufacturer Part Number
LT1537C
Description
Advanced Low Power 5V RS232 Transceiver with Small Capacitors
Manufacturer
LINER [Linear Technology]
Datasheet
1.LT1537C.pdf
(8 pages)
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PI FU CTIO S
LT1537
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 V
shorted to ground or connected with low ESR capacitors.
6
TYPICAL APPLICATIO 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.
U
2
U
0.1 F
ON/OFF = 5V
OUTPUT
+
0.1 F
LOGIC
INPUT
LOGIC
U
+
U
V
CC
RECEIVER
RECEIVER
DRIVER
DRIVER
DRIVER
LT1537
CC
U
, V
V
V
LT1537 Driving Remote Powered LTC1382
+
+
–
, V
–
+
RS232 OUTPUT
THREE
RECEIVERS
NOT USED
and GND
0.1 F
+
0.1 F
+
2
0.1 F
5.1V
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 V
on, off, or in shutdown mode.
PROTECTED
0.1 F
RS232 OUTPUT
LINE PINS
TO 5kV
RS232
+
+
0.1 F
+
0.1 F
0.1 F
DRIVER 1 OUT
DRIVER 2 OUT
DRIVER 3 OUT
0.1 F
0.2 F
+
+
ON/OFF
RX1 IN
RX2 IN
RX3 IN
RX4 IN
RX5 IN
5V V
+
V
V
+
CC
CC
10
11
12
13
14
LTC
1
2
3
4
5
6
7
8
9
RECEIVER
RECEIVER
DRIVER
DRIVER
®
ESD Test Circuit
1382
LT1537
V
V
+
–
CC
ON/OFF = 5V
+
LOGIC
OUTPUT
LOGIC
INPUT
0.1 F
with the power
28
27
26
25
24
23
22
21
20
19
18
17
16
15
+
LT1537 • TA03
0.1 F
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT
GND
DRIVER DISABLE
V
–
+
0.2 F
0.1 F
LT1537 • ESD TC
+