IC TXRX 5V RS232 LOW-PWR 28-SOIC

LT1537CSW

Manufacturer Part NumberLT1537CSW
DescriptionIC TXRX 5V RS232 LOW-PWR 28-SOIC
ManufacturerLinear Technology
TypeTransceiver
LT1537CSW datasheet
 

Specifications of LT1537CSW

Number Of Drivers/receivers3/5ProtocolRS232
Voltage - Supply4.5 V ~ 5.5 VMounting TypeSurface Mount
Package / Case28-SOIC (7.5mm Width)Lead Free Status / RoHS StatusContains lead / RoHS non-compliant
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FEATURE
S
Low Cost
Uses Small Capacitors: 0.1 F, 0.2 F
1 A Supply Current in Shutdown
120kBaud Operation for R
= 3k, C
L
250kBaud Operation for R
= 3k, C
L
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
O
U
A
PPLICATI
S
Notebook Computers
Palmtop Computers
O
U
TYPICAL
A
PPLICATI
+
V
1
+
LT1537
2
0.1 F
5V V
CC
+
3
2 0.1 F
4
5
DRIVER OUT
6
RX IN
7
DRIVER OUT
8
RX IN
TO
9
LINE
RX IN
10
RX IN
11
DRIVER OUT
12
RX IN
13
ON/OFF = 5V
14
5V RS232 Transceiver with
D
ESCRIPTIO
®
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
= 2500pF
LT1537’s charge pump is designed for extended compli-
L
= 1000pF
ance and can deliver over 35mA of load current. Supply
L
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.
V
28
27
0.1 F
+
2 0.1 F
26
+
25
DRIVER IN
24
RX OUT
23
R
DRIVER IN
22
RX OUT
TO LOGIC
21
C
RX OUT
20
RX OUT
19
DRIVER IN
18
RX OUT
17
GND
16
DRIVER
DISABLE
15
LT1537 • TA01
LT1537
Advanced Low Power
Small Capacitors
U
Output Waveforms
RECEIVER
OUTPUT
C
= 50pF
L
DRIVER
OUTPUT
R
= 3k
L
= 2500pF
L
INPUT
LT1537 • TA02
1

LT1537CSW Summary of contents

  • Page 1

    ... 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. – ...

  • Page 2

    ... Consult factory for Industrial and Military grade parts. (Note 2) – = 0 ON/OFF 5V DRIVER DISABLE Positive Negative = HIGH) OUT = LOW) OUT ORDER PART TOP VIEW NUMBER – – LT1537CG + LT1537CSW 4 25 DRIVER OUT DRIVER OUT OUT OUT 10 19 DRIVER OUT 12 17 GND DRIVER 13 16 DISABLE ...

  • Page 3

    ELECTRICAL C HARA TERISTICS C PARAMETER CONDITIONS Any Driver Output Leakage Current Shutdown V Data Rate Slew Rate Propagation Delay Output Transition t Output Transition t Any Receiver Input Voltage Thresholds Input ...

  • Page 4

    LT1537 W U TYPICAL PERFOR A Positive Supply Output Compliance Curve POSITIVE LOAD CURRENT (mA) LT1537 • TPC04 On/Off Thresholds 3.0 2.5 2.0 ON THRESHOLD 1.5 1.0 OFF THRESHOLD 0.5 ...

  • Page 5

    W U TYPICAL PERFOR A Shutdown to Driver Output 10 DRIVER OUTPUT HIGH DRIVER – 5 OUTPUT LOW – ON/OFF PIN CTIO S V ...

  • Page 6

    LT1537 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. ...

  • Page 7

    ... THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS. Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

  • Page 8

    ... 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 Ultra-Low Power, Peripheral-Side Compliment to LT1537 : 499-3977 LT/GP 0595 10K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1995 ...