LT1330 LINER [Linear Technology], LT1330 Datasheet

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LT1330

Manufacturer Part Number
LT1330
Description
5V RS232 Transceiver with 3V Logic Interface and One Receiver Active in Shutdown
Manufacturer
LINER [Linear Technology]
Datasheet

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LINE
FEATURE
A
1.0 F
TYPICAL
2 0.1 F
TO
PPLICATI
3V Logic Interface
ESD Protection over 10kV
Uses Small Capacitors: 0.1 F, 0.2 F, 1.0 F
One Low Power Receiver Remains Active While in
Shutdown
Pin Compatible with LT1137A and LT1237
120kBaud Operation for R
250kBaud Operation for R
CMOS Comparable Low Power: 30mW
Easy PC Layout—Flowthrough Architecture
Rugged Bipolar Design
Outputs Assume a High Impedance State When Off
or Powered Down
Absolutely No Latchup
60 A Supply Current in Shutdown
Available in SO and SSOP Packages
Notebook Computers
Palmtop Computers
RX5 IN (LOW-Q)
DRIVER 1 OUT
DRIVER 2 OUT
DRIVER 3 OUT
ON/OFF
5V V
RX1 IN
RX2 IN
RX3 IN
RX4 IN
3V V
V
CC
A
S
+
L
O
PPLICATI
10
11
12
13
14
1
2
3
4
5
6
7
8
9
U
S
LT1330
L
L
= 3k, C
= 3k, C
O
U
28
27
26
25
24
23
22
21
20
19
18
17
16
15
L
L
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT (LOW-Q)
GND
DRIVER
DISABLE
= 2500pF
= 1000pF
V
2 0.1 F
TO LOGIC
RING DETECT IN
SHUTDOWN
CONTROL OUT
CONTROLLER OR
PROCESSOR
0.1 F
Receiver Active in Shutdown
D
The LT
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 10kV ESD strikes. This eliminates
the need for costly TransZorbs
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.
TransZorb is a registered trademark of General Instruments, GSI
3V Logic Interface and One
ESCRIPTIO
, LTC and LT are registered trademarks of Linear Technology Corporation.
5V RS232 Transceiver with
1330 TA01
®
1330 is a three driver, five receiver RS232 trans-
R
C
L
RECEIVER
C
= 2500pF
OUTPUT
OUTPUT
L
DRIVER
V
R
= 50pF
INPUT
L
L
= 3V
= 3k
U
Output Waveforms
®
on line pins for the RS232
LT1330
1330 TA02
1

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LT1330 Summary of contents

Page 1

... 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- ...

Page 2

... Short-Circuit Duration + V ................................................................... 30 sec – V ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range LT1330I ............................................. – LT1330C ................................................. Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 C ELECTRICAL C HARA TERISTICS C PARAMETER CONDITIONS Power Supply Generator ...

Page 3

... Note 7: For receiver delay measurements, C set between the receiver’s input logic threshold and the output transition to standard TTL/CMOS logic threshold (t = 3V. to 0.8V). Note 8: Data rate operation guaranteed by slew rate, short-circuit current and propagation delay tests. 0.1V. ON/OFF LT1330 MIN TYP MAX UNITS 5.0 7.5 V – 6.3 – ...

Page 4

... LT1330 W U TYPICAL PERFOR A Driver Output Voltage OUTPUT HIGH 4. –2 –4 OUTPUT LOW V = 4.5V CC – –8 –10 –55 – 100 125 TEMPERATURE (°C) 1330 G01 V Supply Current in Shutdown CC 150 125 100 75 50 ...

Page 5

... A logic low on the ON/OFF pin supersedes the state of the DRIVER DISABLE pin. Supply current drops to 3mA when in driver disable mode Positive Supply Output. V requires an external charge storage capacitor, C 1.0 F, tied to ground or 5V. Larger value capacitors may be used LT1330 Receiver Short-Circuit Current RX1 TO RX4 RX1 TO RX4 SC – I ...

Page 6

... U ESD PROTECTIO The RS232 line inputs of the LT1330 have on-chip protec- tion from ESD transients up to 10kV. The protection structures act to divert the static discharge safely to system ground. In order for the ESD protection to function ...

Page 7

... The V and V storage capacitors must be chosen care- fully to insure low ripple and stable operation. The LT1330 charge pump operates in a power efficient Burst Mode operation. When storage capacitor voltage drops below a preset threshold, the oscillator is gated on until V are boosted up to levels exceeding a second threshold. ...

Page 8

... TYP COMMENTS IEC-1000-4-2 ESD Compliant 1 Receiver Active in Shutdown IEC-1000-4-2 ESD Compliant – LT1330 DRIVER 1 IN LOGIC “0” 24 RX1 OUT 23 DRIVER 2 IN LOGIC “0” ...

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