LT1537 Linear Technology, LT1537 Datasheet

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LT1537

Manufacturer Part Number
LT1537
Description
Advanced Low Power 5V RS232 Transceiver with Small Capacitors
Manufacturer
Linear Technology
Datasheet

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FEATURE
A
TYPICAL
LINE
0.1 F
TO
2 0.1 F
PPLICATI
Notebook Computers
Palmtop Computers
Low Cost
Uses Small Capacitors: 0.1 F, 0.2 F
1 A Supply Current in Shutdown
120kBaud Operation for R
250kBaud Operation for R
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
+
DRIVER OUT
DRIVER OUT
DRIVER OUT
+
ON/OFF = 5V
5V V
RX IN
RX IN
RX IN
RX IN
RX IN
S
A
V
CC
+
O
PPLICATI
10
11
12
13
14
1
2
3
4
5
6
7
8
9
U
S
LT1537
L
L
= 3k, C
O
= 3k, C
U
28
27
26
25
24
23
22
21
20
19
18
17
16
15
L
L
= 2500pF
DRIVER IN
RX OUT
DRIVER IN
RX OUT
RX OUT
RX OUT
DRIVER IN
RX OUT
GND
DRIVER
DISABLE
= 1000pF
V
LT1537 • TA01
+
2 0.1 F
TO LOGIC
+
D
0.1 F
The LT
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.
ESCRIPTIO
5V RS232 Transceiver with
®
1537 is a three-driver, five-receiver RS232 trans-
R
C
L
RECEIVER
Advanced Low Power
C
= 2500pF
OUTPUT
OUTPUT
L
DRIVER
R
= 50pF
INPUT
L
= 3k
U
Small Capacitors
Output Waveforms
LT1537
LT1537 • TA02
1

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LT1537 Summary of contents

Page 1

... 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 ...

Page 2

... Receiver .................................... – 0. Short Circuit Duration + V ................................................................... 30 sec – V ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range LT1537C ................................................. Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 C ELECTRICAL C HARA TERISTICS C PARAMETER CONDITIONS Power Supply Generator + V Output – ...

Page 3

... 5.5V –4 CC –6 –8 OUTPUT LOW –10 50 125 –50 – 100 TEMPERATURE ( C) LT1537 • TPC01 (Note 2) = 15V (Note 4) OUT = 3k 2500pF 1000pF 51pF 2500pF L HIGH to LOW (Note 5) HL LOW to HIGH LH = HIGH) OUT = LOW) OUT = 10V = – ...

Page 4

... OUT 0.1 100 125 – –25 TEMPERATURE ( C) LT1537 • TPC08 Receiver Short-Circuit Current – 100 125 –55 – TEMPERATURE ( C) LT1537 • TPC11 75 100 125 LT1537 • TPC06 = 15V 75 125 100 LT1537 • TPC09 ...

Page 5

... HARA TERISTICS C DRIVER OUTPUT DRIVER OUTPUT 2500pF L INPUT LT1537 • TPC12 – Negative Supply Output (RS232 Drivers). V –(2V – 2.5V). This pin requires an external charge CC storage capacitor C 0 seconds. + – pins require two external capacitors C 0.2 F: one from ...

Page 6

... Open receiver inputs assume a logic low state. U 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 ...

Page 7

... NOTE 1 0.004 – 0.012 (0.102 – 0.305) 2. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm). LT1537 – LT1537 DRIVER 1 IN LOGIC “0” 24 RX1 OUT DRIVER LOGIC “ ...

Page 8

... TELEX COMMENTS Premium Performance Upgrade to LT1537 Premium Performance DCE, Compliment to LT1537 Lower Power, Premium Performance Upgrade to LT1537 Premium Performance Device for 5V Systems with 3V Logic Supplies LT1330 with Low Power Receiver That Stays Active During Shutdown Ultra-Low Power, Premium Performance Upgrade to LT1537 ...

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