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1
LTC1386
3.3V Low Power
EIA/TIA562 Transceiver
S
FEATURE
D
U
ESCRIPTIO
s
Operates from a Single 3.3V Supply
s
Low Supply Current: I
CC
= 200
µ
A
s
ESD Protection Over
±
10kV
s
Available in 16-Pin SOIC Narrow Package
s
Uses Small Capacitors: 0.1
µ
F
s
Operates to 120kBaud
s
Output Overvoltage Does Not Force Current
Back into Supplies
s
EIA/TIA562 I/O Lines Can Be Forced to
±
25V
Without Damage
s
Pin Compatible with LT1181A
The LTC1386 is an ultra-low power 2-driver/2-receiver
EIA/TIA562 transceiver that operates from a single
3.3V supply. The charge pump requires only four
space-saving 0.1
µ
F capacitors. The supply current
(I
CC
) of the transceiver is only 200
µ
A with driver out-
puts unloaded.
The LTC1386 is fully compliant with all data rate and
overvoltage EIA/TIA562 specifications. The transceiver
can operate up to 120kbaud with a 1000pF, 3k
load.
Both driver outputs and receiver inputs can be forced to
±
25V without damage and can survive multiple
±
10kV
ESD strikes.
U
S
A
O
PPLICATI
s
Notebook Computers
s
Palmtop Computers
U
A
O
PPLICATI
TYPICAL
Quiescent Supply Current vs Temperature
LTC1386 · TA01
LTC1386
1
3
0.1
µ
F
16
V
CC
= 3.3V
2
0.1
µ
F
6
0.1
µ
F
0.1
µ
F
4
5
562 OUTPUT
14
7
562 OUTPUT
13
562 INPUT
5k
8
562 INPUT
15
11
10
12
9
LOGIC INPUT
LOGIC INPUT
LOGIC OUTPUT
LOGIC OUTPUT
5k
300k
V
CC
300k
V
CC
TEMPERATURE (°C)
20
0
QUIESCENT CURRENT (
µ
A)
100
200
300
400
600
0
20
40
60
LTC1386 · TA02
80
500
TEST CONDITION: V
CC
= 3.3V
QUIESCENT
CURRENT
2
LTC1386
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
W
U
U
PACKAGE/ORDER I FOR ATIO
Supply Voltage (V
CC
) ................................................ 5V
Input Voltage
Driver ....................................... 0.3V to V
CC
+ 0.3V
Receiver ............................................... 25V to 25V
Digital Input ............................... 0.3V to V
CC
+ 0.3V
Output Voltage
Driver .................................................... 25V to 25V
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 .................... 0
°
C to 70
°
C
Storage Temperature Range ................ 65
°
C to 150
°
C
Lead Temperature (Soldering, 10 sec)................. 300
°
C
ORDER PART
NUMBER
LTC1386CN
LTC1386CS
ELECTRICAL C
C
HARA TERISTICS
C
D
T
JMAX
= 125
°
C,
JA
= 65
°
C/W (N)
T
JMAX
= 125
°
C,
JA
= 95
°
C/W (S)
1
2
3
4
5
6
7
8
TOP VIEW
S PACKAGE
16-LEAD NARROW
PLASTIC SOIC
16
15
14
13
12
11
10
9
C1
+
V
+
C1
C2
+
C2
V
TR2 OUT
RX2 IN
V
CC
GND
TR1 OUT
RX1 IN
RX1 OUT
TR1 IN
TR2 IN
RX2 OUT
N PACKAGE
16-LEAD PLASTIC DIP
Consult factory for Industrial and Military grade parts.
V
CC
= 3.3V, C1 = C2 = C3 = C4 = 0.1
µ
F, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Any Driver
Output Voltage Swing
3k to GND
Positive
q
3.7
4.5
V
Negative
q
3.7
4.5
V
Logic Input Voltage Level
Input Low Level (V
OUT
= High)
q
1.4
0.8
V
Input High Level (V
OUT
= Low)
q
2.0
1.4
V
Logic Input Current
V
IN
= V
CC
q
5
µ
A
V
IN
= 0V
q
20
40
µ
A
Output Short-Circuit Current
V
OUT
= 0V
±
10
mA
Any Receiver
Input Voltage Thresholds
Input Low Threshold
q
0.8
1.3
V
Input High Threshold
q
1.7
2.4
V
Hysteresis
q
0.1
0.4
1
V
Input Resistance
10V
V
IN
10V
3
5
7
k
Output Voltage
Output Low, I
OUT
= 1.6mA (V
CC
= 3.3V)
q
0.2
0.4
V
Output High, I
OUT
= 160
µ
A (V
CC
= 3.3V)
q
3.0
3.2
V
Output Short-Circuit Current
Sinking Current, V
OUT
= V
CC
5
20
mA
Sourcing Current, V
OUT
= GND
2
7
mA
Power Supply Generator
V
+
Output Voltage
I
OUT
= 0mA
5.7
V
I
OUT
= 5mA
5.5
V
V
Output Voltage
I
OUT
= 0mA
5.3
V
I
OUT
= 5mA
5.0
V
Power Supply
V
CC
Supply Current
No Load (Note 2)
q
0.2
0.5
mA
3
LTC1386
The
q
denotes specifications which apply over the operating temperature
range of 0
°
C
T
A
70
°
C.
Note 1: Absolute maximum ratings are those values beyond which the life
of the device may be impaired.
C
C
HARA TERISTICS
AC
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Slew Rate
R
L
= 3k, C
L
= 51pF
8
30
V/
µ
s
R
L
= 3k, C
L
= 1000pF
3
5
V/
µ
s
Driver Propagation Delay
t
HLD
(Figure 1)
q
2
3.5
µ
s
(TTL to EIA/TIA562)
t
LHD
(Figure 1)
q
2
3.5
µ
s
Receiver Propagation Delay
t
HLR
(Figure 2)
q
0.3
0.8
µ
s
(EIA/TIA562 to TTL )
t
LHR
(Figure 2)
q
0.3
0.8
µ
s
Note 2: Supply current is measured with driver and receiver outputs
unloaded.
V
CC
= 3.3V, C1 = C2 = C3 = C4 = 0.1
µ
F, unless otherwise noted.
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
DATA RATE (kBAUD)
0
SUPPLY CURRENT (mA)
60
LTC1386 · TPC03
10
5
20
40
80
0
20
15
100
120
140
V
CC
= 3.3V
R
L
= 3k
C
L
= 2500pF
ALL DRIVERS ACTIVE
Supply Current vs Data Rate
TEMPERATURE (°C)
0
THRESHOLD VOLTAGE (V)
1.8
2.0
2.2
30
V
TH
+
V
TH
50
LTC1386 · TPC02
1.6
1.4
10
20
40
60
70
1.2
1.0
Receiver Input Thresholds
vs Temperature
Receiver Output Waveforms
Driver Output Waveforms
DRIVER
OUTPUT
R
L
= 3k
C
L
= 1000pF
DRIVER
OUTPUT
R
L
= 3k
INPUT
RECEIVER
OUTPUT
C
L
= 51pF
INPUT
LTC1386 · TPC05
LTC1386 · TPC06
TEMPERATURE (°C)
0
0
SUPPLY CURRENT (mA)
0.5
1.5
2.0
2.5
40
4.5
LTC1386 · TPC04
1.0
20
10
50
60
30
70
3.0
3.5
4.0
2 DRIVERS LOADED
R
L
= 3k
1 DRIVER LOADED
R
L
= 3k
V
CC
Supply Current
vs Temperature
TEMPERATURE (°C)
0
5
DRIVER OUTPUT VOLTAGE (V)
4
2
1
0
5
2
20
40
50
LTC1386 · TPC01
3
3
4
1
10
30
60
70
OUTPUT HIGH
V
CC
= 3.3V
OUTPUT LOW
V
CC
= 3.3V
ALL DRIVERS WITH LOAD
R
L
= 3k
Driver Output Voltage
vs Temperature
4
LTC1386
PI FU CTIO S
U
U
U
V
CC
: 3.3V Input Supply Pin. This pin should be decoupled
with a 0.1
µ
F ceramic capacitor.
GND: Ground Pin.
V
+
: Positive Supply Output (EIA/TIA562 Drivers). V
+
2V
CC
1V. This pin requires an external capacitor C =
0.1
µ
F for charge storage. The capacitor may be tied to
ground or V
CC
. With multiple devices, the V
+
and V
pins
may share a common capacitor. For large numbers of
devices, increasing the size of the shared common storage
capacitors is recommended to reduce ripple.
V
: Negative Supply Output (RS232 Drivers). V
(2V
CC
1.3V). This pin requires an external capacitor C = 0.1
µ
F
for charge storage.
C1
+
, C1
, C2
+
, C2
: Commutating Capacitor Inputs. These
pins require two external capacitors C = 0.1
µ
F: one from
C1
+
to C1
and another from C2
+
to C2
. To maintain
charge pump efficiency, the capacitor's effective series
resistance should be less than 2
.
TR IN: EIA/TIA562 Driver Input Pins. Inputs are TTL/
CMOS compatible. The inputs of unused drivers can be left
unconnected since 300k input pull-up resistors to V
CC
are
included on chip.
TR OUT: Driver Outputs at EIA/TIA562 Voltage Levels.
The driver outputs are protected against ESD to
±
10kV for
human body model discharges.
RX IN: Receiver Inputs. These pins can be forced to
±
25V
without damage. The receiver inputs are protected against
ESD to
±
10kV for human body model discharges. Each
receiver provides 0.4V of hysteresis for noise immunity.
RX OUT: Receiver Outputs with TTL/CMOS Voltage
Levels.
Figure 1. Driver Propagation Delay Timing
Figure 2. Receiver Propagation Delay Timing
SWITCHI G TI E WAVEFOR S
W
W
U
1.4V
0V
V
CC
0V
V
+
V
0V
DRIVER
INPUT
DRIVER
OUTPUT
1.4V
t
HLD
t
LHD
LTC1386 · F01
0.8V
V
CC
0V
2.4V
RX
INPUT
RX
OUTPUT
1.3V
t
HLR
1.7V
t
LHR
LTC1386 · F02
V
CC
0V
5
LTC1386
Driver Timing Test Load
TEST CIRCUITS
Receiver Timing Test Load
DRIVER
DRIVER
INPUT
3k
51pF
DRIVER
OUTPUT
LTC1386 · TA03
RX
RX INPUT
51pF
RX
OUTPUT
LTC1386 · TA04
ESD Test Circuit
1386 TA05
0.1
µ
F
0.1
µ
F
0.1
µ
F
0.1
µ
F
LTC1386
1
3
4
5
11
10
12
9
13
8
15
LOGIC INPUT
LOGIC INPUT
LOGIC OUTPUT
LOGIC OUTPUT
16
2
6
14
562 OUTPUT
RS562
LINE PINS
PROTECTED
TO ±10kV
VCC
562 OUTPUT
562 INPUT
562 INPUT
5k
5k
300k
V
CC
300k
V
CC
7
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