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Linear Technology Electronic Components Datasheet

LT1341 Datasheet

5V RS232 Transceiver with One Receiver Active in Shutdown

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LT1341
5V RS232 Transceiver with One
Receiver Active in Shutdown
FEATURES
s One Receiver Remains Active While in Shutdown
s ESD Protection Over ±10kV
s Uses Small Capacitors: 0.1µF, 0.2µF
s 60µA Supply Current in Shutdown
s Pin Compatible with LT1137A
s 120kBaud Operation for RL = 3k, CL = 2500pF
s 250kBaud Operation for RL = 3k, CL = 1000pF
s CMOS Comparable Low Power: 60mW
s Operates from a Single 5V Supply
s Easy PC Layout: Flowthrough Architecture
s Rugged Bipolar Design
s Outputs Assume a High Impedance State When
Off or Powered Down
s Absolutely No Latchup
s Available in SSOP Package
APPLICATI S
s Notebook Computers
s Palmtop Computers
DESCRIPTIO
The LT®1341 is an advanced low power three-driver, five-
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® on the RS232 line pins.
The LT1341 is fully compliant with all EIA RS232 specifi-
cations and operates in excess of 120kbaud even driving
heavy capacitive loads.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TransZorb is a registered trademark of General Instruments, GSI
TYPICAL APPLICATI
V+ 1
0.1µF
VCC
2
3
2 × 0.1µF
4
TO LINE
DRIVER 1 OUT
RX1 IN
DRIVER 2 OUT
RX2 IN
RX3 IN
RX4 IN
DRIVER 3 OUT
RX5 IN (LOW-Q)
ON/OFF
NC
5
6
7
8
9
10
11
12
13
14
LT1341
28 V
27 0.1µF
26 2 × 0.1µF
25 DRIVER 1 IN
24 RX1 OUT
23 DRIVER 2 IN
22 RX2 OUT
21 RX3 OUT
20 RX4 OUT
19
DRIVER 3 IN
18 RX5 OUT (LOW-Q)
17
GND
16
DRIVER DISABLE
15 NC
TO LOGIC
RING DETECT IN
µCONTROLLER
OR
µPROCESSOR
SHUTDOWN
CONTROL OUT
LT1341 • TA01
RECEIVER
OUTPUT
CL = 50pF
DRIVER
ROUTPUT
RL = 3k
CL = 2500pF
INPUT
Output Waveforms
LT1341 • TA02
1


Linear Technology Electronic Components Datasheet

LT1341 Datasheet

5V RS232 Transceiver with One Receiver Active in Shutdown

No Preview Available !

LT1341
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage (VCC) ................................................ 6V
V+ ........................................................................ 13.2V
V...................................................................... –13.2V
Input Voltage
Driver ........................................................... V+ to V
Receiver ................................................ 30V to – 30V
Output Voltage
Driver .................................................... – 30V to 30V
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
LT1341C ................................................. 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 1 OUT 5
RX1 IN 6
DRIVER 2 OUT 7
RX2 IN 8
RX3 IN 9
RX4 IN 10
DRIVER 3 OUT 11
RX5 IN
(LOW-Q)
12
ON/OFF 13
NC 14
TOP VIEW
28 V
27 C2
26 C2+
25 DRIVER 1 IN
24 RX1 OUT
23 DRIVER 2 IN
22 RX2 OUT
21 RX3 OUT
20 RX4 OUT
19 DRIVER 3 IN
18
RX5 OUT
(LOW-Q)
17 GND
16
DRIVER
DISABLE
15 NC
ORDER PART
NUMBER
LT1341CG
LT1341CNW
LT1341CSW
G PACKAGE
NW PACKAGE
28-LEAD PLASTIC SSOP 28-LEAD (WIDE) PDIP
SW PACKAGE
28-LEAD (WIDE) PLASTIC SO
TJMAX = 125°C, θJA = 96°C/ W (G)
TJMAX = 125°C, θJA = 56°C/ W (NW)
TJMAX = 125°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)
Supply Rise Time
Shutdown to Turn-On
ON/OFF Pin Thresholds
ON/OFF Pin Current
DRIVER DISABLE Pin Thresholds
DRIVER DISABLE Pin Current
Oscillator Frequency
CONDITIONS
(Note 3)
Shutdown (Note 4)
Driver Disable
C1 = C2 = 0.2µF,
C+ = C = 0.1µF
Input Low Level (Device Shut Down)
Input High Level (Device Enabled)
0V VON/OFF 5V
Input Low Level (Drivers Enabled)
Input High Level (Drivers Disabled)
0V VDRIVER DISABLE 5V
MIN
q
q
q 2.4
q –15
q
q 2.4
q –10
TYP MAX
8.6
–7
14 17
0.06 0.150
3
0.2
1.4 0.8
1.4
80
1.4 0.8
1.4
500
130
UNITS
V
V
mA
mA
mA
ms
V
V
µA
V
V
µA
kHz
2


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