LT1341 Linear Technology, LT1341 Datasheet

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LT1341

Manufacturer Part Number
LT1341
Description
5V RS232 Transceiver with One Receiver Active in Shutdown
Manufacturer
Linear Technology
Datasheet

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FEATURE
A
TO LINE
TYPICAL
0.1 F
PPLICATI
Notebook Computers
Palmtop Computers
One Receiver Remains Active While in Shutdown
ESD Protection Over 10kV
Uses Small Capacitors: 0.1 F, 0.2 F
60 A Supply Current in Shutdown
Pin Compatible with LT1137A
120kBaud Operation for R
250kBaud Operation for R
CMOS Comparable Low Power: 60mW
Operates from a Single 5V Supply
Easy PC Layout: Flowthrough Architecture
Rugged Bipolar Design
Outputs Assume a High Impedance State When
Off or Powered Down
Absolutely No Latchup
Available in SSOP Package
2 0.1 F
RX5 IN (LOW-Q)
DRIVER 1 OUT
DRIVER 2 OUT
DRIVER 3 OUT
ON/OFF
RX1 IN
RX2 IN
RX3 IN
RX4 IN
S
A
NC
V
O
V
CC
PPLICATI
+
10
11
12
13
14
U
1
2
3
4
5
6
7
8
9
S
LT1341
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
RING DETECT IN
SHUTDOWN
CONTROL OUT
CONTROLLER
PROCESSOR
0.1 F
5V RS232 Transceiver with One
OR
Receiver Active in Shutdown
LT1341 • TA01
D
The LT
receiver RS232 transceiver. Included on the chip is a
shutdown pin for reducing supply current to near zero.
During shutdown one receiver remains active to detect
incoming RS232 signals, for example, to wake up a
system. All other receivers and the drivers assume high
impedance states during shutdown.
The driver disable function provides additional control of
operating mode. When driver disable is high the charge
pump and drivers turn off. Receivers continue to operate
during driver disable.
New ESD structures on the chip allow the LT1341 to
survive multiple 10kV strikes, eliminating the need for
costly TransZorbs
The LT1341 is fully compliant with all EIA RS232 specifi-
cations and operates in excess of 120kbaud even driving
heavy capacitive loads.
TransZorb is a registered trademark of General Instruments, GSI
, LTC and LT are registered trademarks of Linear Technology Corporation.
ESCRIPTIO
®
C
1341 is an advanced low power three-driver, five-
L
RECEIVER
C
R
= 2500pF
OUTPUT
OUTPUT
L
DRIVER
R
= 50pF
INPUT
L
= 3k
®
on the RS232 line pins.
U
Output Waveforms
LT1341
LT1341 • TA02
1

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LT1341 Summary of contents

Page 1

... When driver disable is high the charge pump and drivers turn off. Receivers continue to operate during driver disable. New ESD structures on the chip allow the LT1341 to survive multiple 10kV strikes, eliminating the need for costly TransZorbs The LT1341 is fully compliant with all EIA RS232 specifi- cations and operates in excess of 120kbaud even driving heavy capacitive loads ...

Page 2

... Receiver .................................... – 0. Short Circuit Duration + V ................................................................... 30 sec – V ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range LT1341C ................................................. Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 C ELECTRICAL C HARA TERISTICS C PARAMETER CONDITIONS Power Supply Generator + V Output – ...

Page 3

... Note 6: For receiver delay measurements, C set between the receiver’s input logic threshold and the output transition = 3V. to standard TTL/CMOS logic threshold (t to 0.8V). Note 7: Data rate operation guaranteed by slew rate, short-circuit current and propagation delay tests. LT1341 MIN TYP MAX UNITS 5 7.3 V – ...

Page 4

... L 30 2DRIVERS LOADED 1DRIVER LOADED LOAD –55 – 100 TEMPERATURE (°C) LT1341 • TPC08 Supply Current vs Data Rate 80 3DRIVERS ACTIVE 2500pF 100 125 100 ...

Page 5

... Receiver Short-Circuit Current – RX1 TO RX4 RX1 TO RX4 I SC – RX5 RX5 I SC –55 – 100 125 TEMPERATURE ( C) LT1341 • TPC11 Driver Output Waveforms LT1341 • TPC13 . Larger value CC + – and V pins may be paral- LT1341 + 2V – ...

Page 6

... U ESD PROTECTIO The RS232 line inputs of the LT1341 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

... DWG # 05-08-1620) 0.037 – 0.045 (0.940 – 1.143) 0.050 (1.270) TYP 0.014 – 0.019 0.004 – 0.012 (0.356 – 0.482) (0.102 – 0.305) TYP LT1341 0.397 – 0.407* (10.07 – 10.33 0.301 – 0.311 (7.65 – 7.90) ...

Page 8

... LOGIC “0” 22 RX2 OUT 21 RX3 OUT MOUSE DATA 20 RX4 OUT 19 DRIVER 3 IN LOGIC “1” 18 RX5 OUT 17 GND 16 DRIVER DISABLE 15 NC LT1341 • TA04 15kV ESD Protection 15kV ESD Protection 1341fa LT/TP 1098 2K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1993 0.1 F ...

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