LT1331CG Linear Technology, LT1331CG Datasheet

IC TXRX 5V/3V RS232 28-SSOP

LT1331CG

Manufacturer Part Number
LT1331CG
Description
IC TXRX 5V/3V RS232 28-SSOP
Manufacturer
Linear Technology
Type
Transceiverr
Datasheet

Specifications of LT1331CG

Number Of Drivers/receivers
3/5
Protocol
RS232
Voltage - Supply
3.3 V, 5V
Mounting Type
Surface Mount
Package / Case
28-SSOP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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FEATURE
A
TO LINE
TYPICAL
0.1 F
PPLICATI
2 0.1 F
RS232 Compatible 3V Operation
3V Logic Interface
ESD Protection Over 10kV
120kbaud Operation for R
250kbaud Operation for R
One Low Power Receiver Remains Active While
in Shutdown
60 A Supply Current in Shutdown
Low Power Driver Disable Mode
Uses Small Capacitors: 0.1 F, 0.2 F
CMOS Comparable Low Power: 60mW
Easy PC Layout: Flowthrough Architecture
Rugged Bipolar Design
Outputs Assume a High Impedance State When
Off or Powered Down
Notebook Computers
Palmtop Computers
+
RX5 IN (LOW-Q)
+
DRIVER 1 OUT
DRIVER 2 OUT
DRIVER 3 OUT
V
CC
3.3V V
ON/OFF
RX1 IN
RX2 IN
RX3 IN
RX4 IN
S
A
= 3.3V
O
PPLICATI
V
L
+
U
10
11
12
13
14
1
2
3
4
5
6
7
8
9
S
LT1331
L
L
= 3k, C
= 3k, C
O
28
27
26
25
24
23
22
21
20
19
18
17
16
15
U
V
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT (LOW-Q)
GND
DRIVER DISABLE
NC
L
L
= 2500pF
= 1000pF
+
2 0.1 F
TO LOGIC
3.3V Operation
RING DETECT IN
SHUTDOWN
CONTROL OUT
CONTROLLER
PROCESSOR
Transceiver with One Receiver
+
OR
0.1 F
D
The LT
designed for 3V and mixed 3V/5V systems. Receivers
operate from 3V logic supply V
pump and drivers operate from 5V or 3V supply V
The transceiver has two shutdown modes. One mode
disables the drivers and the charge pump, the other shuts
down all circuitry except for one low power receiver which
can be used for ring detection. The V
down while in ring detection mode. While shut down, the
drivers and receivers assume high impedance output
states.
The LT1331 is fully compliant with all EIA-RS232 specifi-
cations when V
compatible with all known interface circuits. Special bipo-
lar construction techniques protect the drivers and receiv-
ers beyond the fault conditions stipulated for RS232. The
RS232 I/O pins are resilient to multiple 10kV ESD strikes.
An advanced driver output stage operates up to 120kbaud
while driving heavy capacitive loads.
1331 TA01
ESCRIPTIO
, LTC and LT are registered trademarks of Linear Technology Corporation.
3V RS562 or 5V/3V RS232
®
C
1331 is a 3-driver, 5-receiver RS232 transceiver
L
R
RECEIVER
C
= 2500pF
OUTPUT
L
OUTPUT
DRIVER
R
= 50pF
INPUT
L
= 3k
CC
Active in Shutdown
= 5V. If V
U
CC
= 3V, output drive levels are
L
, while the onboard charge
CC
supply may be shut
LT1331
CC
.
1331 TA02
1

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LT1331CG Summary of contents

Page 1

... RS232. The RS232 I/O pins are resilient to multiple 10kV ESD strikes. An advanced driver output stage operates up to 120kbaud while driving heavy capacitive loads. , LTC and LT are registered trademarks of Linear Technology Corporation. 3.3V Operation RECEIVER – ...

Page 2

... ON/OFF Input Low Level (Drivers Enabled) Input High Level (Drivers Disabled DRIVER DISABLE U W TOP VIEW ORDER PART NUMBER – – LT1331CG 4 25 DRIVER 1 IN LT1331CNW 5 24 RX1 OUT LT1331CSW 6 23 DRIVER RX2 OUT 8 21 RX3 OUT 9 20 RX4 OUT 10 19 ...

Page 3

ELECTRICAL C HARA TERISTICS C PARAMETER Any Driver Output Voltage Swing, Positive Output Voltage Swing, Negative Logic Input Voltage Level Logic Input Current Output Short-Circuit Current Output Leakage Current Data Rate (Note 8) Slew Rate Propagation Delay Any Receiver Input ...

Page 4

LT1331 W U TYPICAL PERFOR A Driver Short-Circuit Current – –55 – 100 125 TEMPERATURE (°C) 1331 G01 Driver Leakage ...

Page 5

CTIO (Pin 1): Positive Supply Output. V pin requires an external capacitor for charge storage, chosen to minimize ripple to acceptable levels. A mini- mum size of 0 recommended. V ...

Page 6

... RS232 drivers, but keeps all five receivers active. Power consumption in driver disable mode is 3mA from V and less than 100 A from V L Table 1. Commonly Used RS232 Interface Circuit Receiver Thresholds MANUFACTURER PART NUMBER Linear Technology LT1080 LT1137A LT1330 LT1281 All Others Texas Instruments SN75189 ...

Page 7

... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) 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

... L INPUT COMMENTS 10kV ESD 15kV ESD 2 RXs Active in Shutdown 15kV ESD 1331fa LT/TP 0998 REV A 2K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1993 0.394 – 0.419 (10.007 – 10.643) S28 (WIDE) 0996 1331 TA04 ...

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