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LT1537CSW

Description
Advanced Low Power 5V RS232 Transceiver with Small Capacitors
CategoryAnalog mixed-signal IC    Drivers and interfaces   
File Size208KB,8 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LT1537CSW Overview

Advanced Low Power 5V RS232 Transceiver with Small Capacitors

LT1537CSW Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
Parts packaging codeSOIC
package instructionSOP, SOP28,.4
Contacts28
Manufacturer packaging codeSW
Reach Compliance Code_compli
ECCN codeEAR99
Other featuresEXTERNAL CHARGE PUMP
Differential outputNO
Number of drives3
High level input current maximum value0.00002 A
Input propertiesSCHMITT TRIGGER
Interface integrated circuit typeLINE TRANSCEIVER
Interface standardsEIA-232
JESD-30 codeR-PDSO-G28
JESD-609 codee0
length17.9 mm
Humidity sensitivity level1
Number of functions1
Number of terminals28
Maximum operating temperature70 °C
Minimum operating temperature
Minimum output swing10 V
Output characteristics3-STATE
Maximum output low current0.0016 A
Output polarityINVERTED
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP28,.4
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)235
power supply5 V
Certification statusNot Qualified
Maximum receive delay600 ns
Number of receiver bits5
Maximum seat height2.65 mm
Maximum slew rate17 mA
Nominal supply voltage5 V
surface mountYES
technologyBIPOLAR
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
maximum transmission delay1300 ns
width7.5 mm
Base Number Matches1
LT1537
Advanced Low Power
5V RS232 Transceiver with
Small Capacitors
FEATURES
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
Low Cost
Uses Small Capacitors: 0.1µF, 0.2µF
1
µ
A Supply Current in Shutdown
120kBaud Operation for R
L
= 3k, C
L
= 2500pF
250kBaud Operation for R
L
= 3k, C
L
= 1000pF
CMOS Comparable Low Power: 40mW
Operates from a Single 5V Supply
Easy PC Layout: Flow-through Architecture
Rugged Bipolar Design
Outputs Assume a High Impedance State When Off
or Powered Down
Improved Protection: RS232 I/O Lines Can Be Forced
to
±25V
Without Damage
Output Overvoltage Does Not Force Current Back
into Supplies
Absolutely No Latch-Up
Available in SO Package
The LT
®
1537 is a three-driver, five-receiver RS232 trans-
ceiver, pin compatible with the LT1137A, offering perfor-
mance improvements and two shutdown modes. The
LT1537’s charge pump is designed for extended compli-
ance and can deliver over 35mA of load current. Supply
current is typically 8mA, competitive with similar CMOS
devices. An advanced driver output stage operates up to
250kbaud while driving heavy capacitive loads.
The LT1537 is fully compliant with all RS232 specifica-
tions. Special bipolar construction techniques protect the
drivers and receivers beyond the fault conditions stipu-
lated for RS232. Driver outputs and receiver inputs can be
shorted to
±25V
without damaging the device or the
power supply generator. In addition, the RS232 I/O pins
are resilient to multiple
±5kV
ESD strikes.
The transceiver has two shutdown modes. One mode
disables the drivers and the charge pump, the other shuts
down all circuitry. While shut down, the drivers and
receivers assume high impedance output states.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATI
s
s
S
Notebook Computers
Palmtop Computers
TYPICAL APPLICATI
+
0.1µF
2
×
0.1µF
V
+
5V V
CC
1
2
3
4
DRIVER OUT
RX IN
DRIVER OUT
TO
LINE
RX IN
RX IN
RX IN
DRIVER OUT
RX IN
ON/OFF = 5V
5
6
7
8
9
10
11
12
13
14
LT1537
28
27
25
24
23
22
21
20
19
18
17
16
15
26
V
0.1µF
RECEIVER
OUTPUT
C
L
= 50pF
R
DRIVER
OUTPUT
R
L
= 3k
C
L
= 2500pF
DRIVER IN
RX OUT
DRIVER IN
RX OUT
RX OUT
RX OUT
DRIVER IN
RX OUT
GND
DRIVER
DISABLE
LT1537 • TA01
+
+
2
×
0.1µF
TO LOGIC
INPUT
U
Output Waveforms
LT1537 • TA02
+
UO
UO
1

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