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LT1330IJW Datasheet

  • LT1330IJW

  • 5V RS232 Transceiver with 3V Logic Interface and One Receive...

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LT1330
5V RS232 Transceiver with
3V Logic Interface and One
Receiver Active in Shutdown
FEATURES
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
3V Logic Interface
ESD Protection over
鹵10kV
Uses Small Capacitors: 0.1碌F, 0.2碌F, 1.0碌F
One Low Power Receiver Remains Active While in
Shutdown
Pin Compatible with LT1137A and LT1237
120kBaud Operation for R
L
= 3k, C
L
= 2500pF
250kBaud Operation for R
L
= 3k, C
L
= 1000pF
CMOS Comparable Low Power: 30mW
Easy PC Layout鈥擣lowthrough Architecture
Rugged Bipolar Design
Outputs Assume a High Impedance State When Off
or Powered Down
Absolutely No Latchup
60碌A(chǔ) Supply Current in Shutdown
Available in SO and SSOP Packages
The LT
廬
1330 is a three driver, five receiver RS232 trans-
ceiver with low supply current. Designed to interface with
new 3V logic, the LT1330 operates with both a 5V power
supply and a 3V logic power supply. The chip may be shut
down to micropower operation with one receiver remain-
ing active to monitor RS232 inputs such as ring detect
from a modem.
The LT1330 is fully compliant with all EIA RS232 specifi-
cations. Additionally, the RS232 line input and output pins
are resilient to multiple
鹵10kV
ESD strikes. This eliminates
the need for costly TransZorbs
廬
on line pins for the RS232
part.
The LT1330 operates to 120kbaud even driving high
capacitive loads. During shutdown, driver and receiver
outputs are at a high impedance state allowing devices to
be paralleled.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TransZorb is a registered trademark of General Instruments, GSI
APPLICATI
s
s
S
Notebook Computers
Palmtop Computers
TYPICAL APPLICATI
V
+
1.0碌F
2
脳
0.1碌F
DRIVER 1 OUT
RX1 IN
DRIVER 2 OUT
TO
LINE
RX2 IN
RX3 IN
RX4 IN
DRIVER 3 OUT
RX5 IN (LOW-Q)
ON/OFF
3V V
L
5V V
CC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LT1330
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
鈥?/div>
2
脳
0.1碌F
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT (LOW-Q)
GND
DRIVER
DISABLE
INPUT
RING DETECT IN
碌CONTROLLER
OR
碌PROCESSOR
SHUTDOWN
CONTROL OUT
1330 TA01
1330 TA02
0.1碌F
RECEIVER
OUTPUT
V
L
= 3V
C
L
= 50pF
DRIVER
OUTPUT
R
L
= 3k
C
L
= 2500pF
R
TO LOGIC
U
Output Waveforms
UO
UO
1

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