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Linear Technology Electronic Components Datasheet

LT1537 Datasheet

Advanced Low Power 5V RS232 Transceiver with Small Capacitors

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LT1537
Advanced Low Power
5V RS232 Transceiver with
Small Capacitors
FEATURES
s Low Cost
s Uses Small Capacitors: 0.1µF, 0.2µF
s 1µA Supply Current in Shutdown
s 120kBaud Operation for RL = 3k, CL = 2500pF
s 250kBaud Operation for RL = 3k, CL = 1000pF
s CMOS Comparable Low Power: 40mW
s Operates from a Single 5V Supply
s Easy PC Layout: Flow-through Architecture
s Rugged Bipolar Design
s Outputs Assume a High Impedance State When Off
or Powered Down
s Improved Protection: RS232 I/O Lines Can Be Forced
to ±25V Without Damage
s Output Overvoltage Does Not Force Current Back
into Supplies
s Absolutely No Latch-Up
s Available in SO Package
APPLICATI S
s Notebook Computers
s Palmtop Computers
DESCRIPTIO
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.
TYPICAL APPLICATI
+
0.1µF
+
2 × 0.1µF
V+
5V VCC
1
2
3
4
DRIVER OUT 5
RX IN 6
DRIVER OUT 7
TO
LINE
RX IN
RX IN
8
9
RX IN 10
DRIVER OUT 11
RX IN 12
13
ON/OFF = 5V
14
LT1537
28 V
27 0.1µF
26 2 × 0.1µF
25
DRIVER IN
24
RX OUT
23 DRIVER IN
22
RX OUT
21
RX OUT
20 RX OUT
19
DRIVER IN
18 RX OUT
17 GND
TO LOGIC
16 DRIVER
15 DISABLE
LT1537 • TA01
RECEIVER
OUTPUT
CL = 50pF
R DRIVER
OUTPUT
RL = 3k
CL = 2500pF
INPUT
Output Waveforms
LT1537 • TA02
1


Linear Technology Electronic Components Datasheet

LT1537 Datasheet

Advanced Low Power 5V RS232 Transceiver with Small Capacitors

No Preview Available !

LT1537
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage (VCC) ............................................. 5.5V
V+ ........................................................................ 13.2V
V(Note 7) .......................................................... – 6.5V
Input Voltage
Driver ........................................................... Vto V +
Receiver ............................................... – 25V to 25V
Output Voltage
Driver ....................................... V + – 25V to V+ 25V
Receiver .................................... – 0.3V to VCC + 0.3V
Short Circuit Duration
V+ ................................................................... 30 sec
V................................................................... 30 sec
Driver Output .............................................. Indefinite
Receiver Output .......................................... Indefinite
Operating Temperature Range
LT1537C ................................................. 0°C to 70°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
V+ 1
5V VCC
C1+
C1
2
3
4
DRIVER OUT 5
RX IN 6
DRIVER OUT 7
RX IN 8
RX IN 9
RX IN 10
DRIVER OUT 11
RX IN 12
ON/OFF 13
NC 14
TOP VIEW
28 V
27 C2
26 C2+
25 DRIVER IN
24 RX OUT
23 DRIVER IN
22 RX OUT
21 RX OUT
20 RX OUT
19 DRIVER IN
18 RX OUT
17 GND
16
DRIVER
DISABLE
15 NC
ORDER PART
NUMBER
LT1537CG
LT1537CSW
G PACKAGE
28-LEAD PLASTIC SSOP
SW PACKAGE
28-LEAD PLASTIC SO WIDE
TJMAX = 150°C, θJA = 96°C/ W (G)
TJMAX = 150°C, θJA = 85°C/ W (SW)
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS (Note 2)
PARAMETER
Power Supply Generator
V+ Output
VOutput
Supply Current (VCC)
Supply Current When OFF (VCC)
Shutdown to Turn-On
ON/OFF Pin Thresholds
ON/OFF Pin Current
Driver Disable Pin Thresholds
Driver Disable Pin Current
Oscillator Frequency
Any Driver
Output Voltage Swing
CONDITIONS
(Note 3)
Shutdown (Note 4)
DRIVER DISABLE
C+, C = 0.1µF, C1, C2 = 0.2µF
Input LOW Level (Device Shutdown)
Input HIGH Level (Device Enabled)
0V VON/OFF 5V
Input LOW Level (Drivers Enabled)
Input HIGH Level (Drivers Disabled)
0V VDRIVER DISABLE 5V
Load = 3k to GND
Logic Input Voltage Level
Logic Input Current
Output Short-Circuit Current
Input LOW Level (VOUT = HIGH)
Input HIGH Level (VOUT = LOW)
0.8V VIN 2V
VOUT = 0V
Positive
Negative
MIN TYP MAX
8.6
– 7.0
q 8 17
q 1.0 10
1.5
0.2
q 1.4 0.8
q 2.4
1.4
q –15
80
q 1.4 0.8
q 2.4
1.4
q –10
500
130
q 5.0
7.5
q – 6.3 – 5.0
q
q2
1.4 0.8
1.4
q 5 20
±17
UNITS
V
V
mA
µA
mA
ms
V
V
µA
V
V
µA
kHz
V
V
V
µA
mA
2


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





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