LT1341CNW#PBF

1
LT1341
5V RS232 Transceiver with One
Receiver Active in Shutdown
S
F
EA
T
U
RE
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.
One Receiver Remains Active While in Shutdown
ESD Protection Over ±10kV
Uses Small Capacitors: 0.1µF, 0.2µF
60µA Supply Current in Shutdown
Pin Compatible with LT1137A
120kBaud Operation for R
L
= 3k, C
L
= 2500pF
250kBaud Operation for R
L
= 3k, C
L
= 1000pF
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
D
U
ESCRIPTIO
, LTC and LT are registered trademarks of Linear Technology Corporation.
TransZorb is a registered trademark of General Instruments, GSI
Output Waveforms
R
LT1341 • TA02
RECEIVER
OUTPUT
C
L
= 50pF
DRIVER
OUTPUT
R
L
= 3k
C
L
= 2500pF
INPUT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
V
+
0.1µF
2 × 0.1µF
2 × 0.1µF
0.1µF
GND
DRIVER DISABLE
TO LINE
TO LOGIC
V
LT1341 • TA01
RX5 OUT (LOW-Q)
RING DETECT IN
µCONTROLLER
OR
µPROCESSOR
SHUTDOWN 
CONTROL OUT
LT1341
NC
V
CC
DRIVER 1 OUT
RX1 IN
DRIVER 2 OUT
RX2 IN
RX3 IN
RX4 IN
DRIVER 3 OUT
RX5 IN (LOW-Q)
ON/OFF 
NC
Notebook Computers
Palmtop Computers
U
S
A
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PP
L
IC
AT
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A
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PP
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IC
AT
ITY
P
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CA
L
2
LT1341
(Note 1)
Supply Voltage (V
CC
) ................................................ 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 V
CC
+ 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
A
U
G
W
A
W
U
W
ARB
S
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T
EXI T
I
S
WU
U
PACKAGE
/
O
RDER I FOR ATIO
PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply Generator
V
+
Output 8.6 V
V
Output –7 V
Supply Current (V
CC
) (Note 3) 14 17 mA
Supply Current When OFF (V
CC
) Shutdown (Note 4) 0.06 0.150 mA
Driver Disable 3 mA
Supply Rise Time C1 = C2 = 0.2µF, 0.2 ms
Shutdown to Turn-On C
+
= C
= 0.1µF
ON/OFF Pin Thresholds Input Low Level (Device Shut Down)
1.4 0.8 V
Input High Level (Device Enabled) 2.4 1.4 V
ON/OFF Pin Current 0V V
ON/OFF
5V –15 80 µA
DRIVER DISABLE Pin Thresholds Input Low Level (Drivers Enabled) 1.4 0.8 V
Input High Level (Drivers Disabled) 2.4 1.4 V
DRIVER DISABLE Pin Current 0V V
DRIVER DISABLE
5V 10 500 µA
Oscillator Frequency 130 kHz
E
LECTR
IC
AL C CHARA TERIST
ICS
(Note 2)
ORDER PART
NUMBER
Consult factory for Industrial and Military grade parts.
LT1341CG
LT1341CNW
LT1341CSW
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V
+
5V V
CC
C1
+
C1
DRIVER 1 OUT
RX1 IN
DRIVER 2 OUT
RX2 IN
RX3 IN
RX4 IN
DRIVER 3 OUT
ON/OFF
NC
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
C2
C2
+
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
GND
NC
NW PACKAGE
28-LEAD (WIDE) PDIP
TOP VIEW
SW PACKAGE
28-LEAD (WIDE) PLASTIC SO
G PACKAGE
28-LEAD PLASTIC SSOP
RX5 IN
(LOW-Q)
RX5 OUT
(LOW-Q)
DRIVER 
DISABLE
T
JMAX
= 125°C, θ
JA
= 96°C/W (G)
T
JMAX
= 125°C,
θ
JA
= 56°C/W (NW)
T
JMAX
= 125°C, θ
JA
= 85°C/W (SW)
3
LT1341
PARAMETER CONDITIONS MIN TYP MAX UNITS
Any Driver
Output Voltage Swing Load = 3k to GND Positive
5 7.3 V
Negative 6.5 5 V
Logic Input Voltage Level Input Low Level (V
OUT
= High) 1.4 0.8 V
Input High Level (V
OUT
= Low) 2 1.4 V
Logic Input Current 0.8V V
IN
2V 520 µA
Output Short-Circuit Current V
OUT
= 0V ±9 ±17 mA
Output Leakage Current Shutdown V
OUT
= ±30V (Note 4) 10 100 µA
Data Rate (Note 7) R
L
= 3k, C
L
= 2500pF 120 kBaud
R
L
= 3k, C
L
= 1000pF 250 kBaud
Slew Rate R
L
= 3k, C
L
= 51pF 15 30 V/µs
R
L
= 3k, C
L
= 2500pF 4 6 V/µs
Propagation Delay Output Transition t
HL
High to Low (Note 5) 0.6 1.3 µs
Output Transition t
LH
Low to High 0.5 1.3 µs
Any Receiver
Input Voltage Thresholds Input Low Threshold (V
OUT
= High) 0.8 1.3 V
Input High Threshold (V
OUT
= Low) 1.7 2.4 V
Hysteresis 0.1 0.4 1.0 V
Input Resistance 357 k
Output Leakage Current Shutdown (Note 4) 0 V
OUT
V
CC
110 µA
Receivers 1 Through 4
Output Voltage Output Low, I
OUT
= –1.6mA 0.2 0.4 V
Output High, I
OUT
= 160µA (V
CC
= 5V) 3.5 4.2 V
Output Short-Circuit Current Sinking Current, V
OUT
= V
CC
20 10 mA
Sourcing Current, V
OUT
= 0V 10 20 mA
Propagation Delay Output Transition t
HL
High to Low (Note 6) 250 600 ns
Output Transition t
LH
Low to High 350 600 ns
Receiver 5 (Low-I
Q
RX)
Output Voltage Output Low, I
OUT
= –500µA 0.2 0.4 V
Output High, I
OUT
= 160µA (V
CC
= 5V) 3.5 4.2 V
Output Short-Circuit Current Sinking Current, V
OUT
= V
CC
–4 –2 mA
Sourcing Current, V
OUT
= 0V 2 4 mA
Propagation Delay Output Transition t
HL
High to Low (Note 6) 1 3 µs
Output Transition t
LH
Low to High 1 3 µs
E
LECTR
IC
AL C CHARA TERIST
ICS
(Note 2)
The denotes specifications which apply over the full operating
temperature range (0°C T
A
70°C for commercial grade).
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: Testing done at V
CC
= 5V and V
ON/OFF
= 3V.
Note 3: Supply current is measured as the average over several charge
pump cycles. C
+
= C
= 0.1µF, C1 = C2 = 0.2µF. All outputs are open with
all driver inputs tied high.
Note 4: Supply current and leakage measurements in shutdown are
performed with V
ON/OFF
0.1V. Supply current measurements using driver
disable are performed with V
DRIVER DISABLE
3V.
Note 5: For driver delay measurements, R
L
= 3k and C
L
= 51pF. Trigger
points are set between the driver’s input logic threshold and the output
transition to the zero crossing (t
HL
= 1.4V to 0V and t
LH
= 1.4V to 0V).
Note 6: For receiver delay measurements, C
L
= 51pF. Trigger points are
set between the receiver’s input logic threshold and the output transition
to standard TTL/CMOS logic threshold (t
HL
= 1.3V to 2.4V and t
LH
= 1.7V
to 0.8V).
Note 7: Data rate operation guaranteed by slew rate, short-circuit current
and propagation delay tests.

LT1341CNW#PBF

Mfr. #:
Manufacturer:
Analog Devices Inc.
Description:
RS-232 Interface IC 5V RS232 Tran w/ One Rcv Active in SHUTD
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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