SHUTDOWN CURRENT ( A)
LTC1385
3.3V Low Power
EIA/TIA-562 Transceiver
FEATURES
DESCRIPTIO
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Operates from a Single 3.3V Supply The LTC 1385 is an ultra-low power, 2-driver/2-receiver
n
Low Supply Current: I = 200m A EIA/TIA-562 transceiver which operates from a single
CC
n
I = 35m A in Driver Disable Mode 3.3V supply. The charge pump requires only four space-
CC
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I = 0.2m A in Shutdown Mode saving 0.1m F capacitors.
CC
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ESD Protection Over 10kV
The transceiver operates in one of three modes: Normal,
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Uses Small Capacitors: 0.1m F
Driver Disable or Shutdown. In the Normal mode, I is
CC
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Operates to 120kBaud
only 200m A in the unloaded condition. In the Driver Disable
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Output Overvoltage Does Not Force Current
mode, the charge pump is turned off, the driver outputs
Back into Supplies
are forced into three-state, both receivers are kept active,
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EIA/TIA-562 I/O Lines Can Be Forced to 25V
and I drops to 35m A. In the Shutdown mode, everything
CC
Without Damage
is turned off and I drops to 0.2m A.
CC
n
Pin Compatible with LT1180A
The LTC1385 is fully compliant with all data rate and
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overvoltage EIA / TIA-562 specifications. The transceiver
APPLICATIO S
can operate up to 120kbaud with a 1000pF, 3kW load.
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Notebook Computers
Both driver outputs and receiver inputs can be forced to
n
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 Driver Disable vs Temperature
600 1.2
17
2
V = 3.3V
CC
LTC1385
0.1m F
3
4
500 1.0
7
5
m
0.1m F
V
6 CC
0.1m F 0.1m F
400 0.8
300k
12 15
LOGIC INPUT
562 OUTPUT QUIESCENT
300 0.6
V
CC CURRENT
300k
11
8
200 0.4
LOGIC INPUT 562 OUTPUT
m
14
13
LOGIC OUTPUT 562 INPUT
100 0.2
SHUTDOWN
5k CURRENT
10
9
562 INPUT
LOGIC OUTPUT
0 0
20 0 20 40 60 80
5k
16
18 TEMPERATURE (C)
ON/OFF
TEST CONDITION: V = 3.3V
CC
1
LTC1385 TA02
LTC1385 TA01
DRIVER DISABLE
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QUIESCENT CURRENT ( A)
U
ULTC1385
ABSOLUTE AXI U RATI GS
Supply Voltage (V ) ................................................ 5V 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 LTC1385C ............................................. 0 C to 70 C
Receiver .................................... 0.3V to V + 0.3V LTC1385I........................................... 40 C to 85 C
CC
Storage Temperature Range ................ 65 C to 150 C
Lead Temperature (Soldering, 10 sec)................. 300 C
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PACKAGE/ORDER I FOR ATIO
TOP VIEW ORDER PART ORDER PART
TOP VIEW
DRIVER
NUMBER NUMBER
1 20 ON/OFF
DISABLE
DRIVER
1 18 ON/OFF
+
DISABLE
C1 2 19 VCC
+
C1 2 17 V
CC
+
V 3 18 GND
LTC1385CG LTC1385CN
+
3
V 16 GND
C1 4 17 TR1 OUT
LTC1385IG LTC1385CSW
4
C1 15 TR1 OUT
+
C2 5 16 RX1 IN
+ LTC1385IN
5
C2 14 RX1 IN
C2 6 15 RX1 OUT
LTC1385ISW
6 13
C2 RX1 OUT
V 7 14 TR1 IN
7 12
V TR1 IN
TR2 OUT 8 13 TR2 IN
8 11
TR2 OUT TR2 IN
RX2 IN 9 12 RX2 OUT
9 10
RX2 IN RX2 OUT
NC 10 11 NC
N PACKAGE SW PACKAGE
G PACKAGE
18-LEAD PDIP 18-LEAD PLASTIC SO
20-LEAD SSOP
T = 125 C, q = 135 C/W T = 125 C, q = 85 C/W
JMAX JA JMAX JA
Consult LTC Marketing for parts specified with wider operating temperature ranges.
DC ELECTRICAL CHARACTERISTICS
The l denotes specifications which apply over the full operating
temperature range. V = 3.3V, C1 = C2 = C3 = C4 = 0.1m F, V = V , Driver Disable = V , unless noted.
CC ON/OFF CC CC
PARAMETER CONDITIONS MIN TYP MAX UNITS
Any Driver
Output Voltage Swing 3k to GND Positive l 3.7 4.5 V
Negative l 3.7 4.5 V
Logic Input Voltage Level Input Low Level (V = High) l 1.4 0.8 V
OUT
Input High Level (V = Low) l 2.0 1.4 V
OUT
Logic Input Current V = V l 5 m A
IN CC
V = 0V l 20 40 m A
IN
Output Short-Circuit Current V = 0V 10 mA
OUT
Output Leakage Current Shutdown or Driver Disable or V = 0V (Note 3,4), l 10 500 m A
CC
V = 20V
OUT
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