SHUTDOWN CURRENT (A)
LTC1384
5V Low Power RS232
Transceiver with 2 Receivers
Active in Shutdown
FEATURES
DESCRIPTIO
Operates from a Single 5V Supply The LTC 1384 is an ultra-low power 2-driver/2-receiver
Low Supply Current: I = 220A RS232 transceiver that operates from a single 5V
CC
I = 35A in Shutdown Mode with Both supply. The charge pump requires only four space-
CC
Receivers Kept Alive saving 0.1F capacitors.
ESD Protection Over 10kV
The transceiver operates in one of two modes, Normal and
Uses Small Capacitors: 0.1F
Shutdown. In the Normal mode, I is only 220A with the
CC
Operates to 120kBaud
driver outputs unloaded. In the Shutdown mode, the
Output Overvoltage Does Not Force Current
charge pump is turned off, the driver outputs are forced
Back into Supplies
into three-state, both receivers are kept active and I
CC
RS232 I/O Lines Can Be Forced to 25V
drops to 35A. The receiver outputs may be forced into
Without Damage
three-state at any time using the receiver enable (RX EN)
Pin Compatible with LT1180A
pin.
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The LTC1384 is fully compliant with all data rate and
APPLICATIO S
overvoltage RS232 specifications. The transceiver can
operate up to 120kbaud with a 2500pF, 3k load. Both
Notebook Computers
driver outputs and receiver inputs can be forced to
Palmtop Computers
25V without damage and can survive multiple 10kV
ESD strikes.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
2-Drivers/2-Receivers with Shutdown Quiescent and Shutdown Supply Current
and Receiver Enable vs Temperature
1200 60
2 17
V = 5V TEST CONDITION: V = 5V
CC CC
0.1F
4 3
1000 50
0.1F
LTC1384
5
7
SHUTDOWN
0.1F 0.1F 800 40
6
V CURRENT
CC
300k
600 30
12 15
LOGIC INPUT 232 OUTPUT
V
CC
400 20
300k QUIESCENT
CURRENT
11 8
LOGIC INPUT 232 OUTPUT
200 10
13 14
LOGIC OUTPUT 232 INPUT
5k
0 0
20 20 40 60 80
0
TEMPERATURE (C)
10 9
LOGIC OUTPUT 232 INPUT
LTC1384 TA02
5k
18 16
ON/OFF
LTC1384 TA01
1
RX EN
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QUIESCENT CURRENT (A)
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ULTC1384
ABSOLUTE AXI U RATI GS
Supply Voltage (V ) ................................................ 6V Short-Circuit Duration
CC
+
Input Voltage V ................................................................... 30 sec
Driver ....................................... 0.3V to V + 0.3V V ................................................................... 30 sec
CC
Receiver ............................................... 25V to 25V Driver Output .............................................. Indefinite
Digital Input ............................... 0.3V to V + 0.3V Receiver Output .......................................... Indefinite
CC
Output Voltage Operating Temperature Range
Driver .................................................... 25V to 25V LTC1384C ............................................... 0C to 70C
Receiver .................................... 0.3V to V + 0.3V LTC1384I............................................ 40C to 85C
CC
Storage Temperature Range ................. 65C to 150C
Lead Temperature (Soldering, 10 sec)................. 300C
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PACKAGE/ORDER I FOR ATIO
TOP VIEW
ORDER PART TOP VIEW ORDER PART
RX EN 1 20 ON/OFF
+ NUMBER NUMBER
C1 2 19 VCC RX EN 1 18 ON/OFF
+ +
2 17
V 3 18 GND C1 V
CC
+
C1 4 17 TR1 OUT LTC1384CG V 3 16 GND
LTC1384CN
+
C2 5 RX1 IN C1 4 15 TR1 OUT
16
LTC1384IG
LTC1384CSW
+
5 14
C2 6 15 RX1 OUT C2 RX1 IN
LTC1384IN
6
V 7 14 TR1 IN C2 13 RX1 OUT
LTC1384ISW
TR2 OUT 8 TR2 IN V 7 12 TR1 IN
13
8 11
RX2 IN 9 12 RX2 OUT TR2 OUT TR2 IN
9
NC 10 11 NC RX2 IN 10 RX2 OUT
G PACKAGE N PACKAGE SW PACKAGE
20-LEAD SSOP 18-LEAD PDIP 18-LEAD PLASTIC SO
T = 125C, = 135C/W
T = 125C, = 65C/W T = 125C, = 85C/W
JMAX JA JMAX JA JMAX JA
Consult LTC Marketing for parts specified with wider operating temperature ranges.
DC ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating
temperature range. V = 5V, C1 = C2 = C3 = C4 = 0.1F, V = V , RX EN = 0V, unless otherwise noted.
CC ON/OFF CC
PARAMETER CONDITIONS MIN TYP MAX UNITS
Any Driver
Output Voltage Swing 3k to GND Positive 5.0 7.0 V
Negative 5.0 6.5 V
Logic Input Voltage Level Input Low Level (V = High) 1.4 0.8 V
OUT
Input High Level (V = Low) 2.0 1.4 V
OUT
Logic Input Current V = V 5 A
IN CC
V = 0V 20 40 A
IN
Output Short-Circuit Current V = 0V 9 12 mA
OUT
Output Leakage Current Shutdown or V = 0V (Note 3), V = 10V 10 500 A
CC OUT
Any Receiver
Input Voltage Thresholds Input Low Threshold 0.8 1.3 V
Input High Threshold 1.7 2.4 V
Hysteresis 0.1 0.4 1 V
Input Resistance 10V V 10V 3 5 7 k
IN
Output Voltage Output Low, I = 1.6mA (V = 5V) 0.2 0.4 V
OUT CC
Output High, I = 160A (V = 5V) 3.0 3.2 V
OUT CC
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