www.docs.chipfind.ru
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
A
s
ESD Protection Over
10kV
s
Available in 16-Pin SOIC Narrow Package
s
Uses Small Capacitors: 0.1
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
F capacitors. The supply current
(I
CC
) of the transceiver is only 200
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
F
16
V
CC
= 3.3V
2
0.1
F
6
0.1
F
0.1
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 (
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
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
A
V
IN
= 0V
q
20
40
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
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/
s
R
L
= 3k, C
L
= 1000pF
3
5
V/
s
Driver Propagation Delay
t
HLD
(Figure 1)
q
2
3.5
s
(TTL to EIA/TIA562)
t
LHD
(Figure 1)
q
2
3.5
s
Receiver Propagation Delay
t
HLR
(Figure 2)
q
0.3
0.8
s
(EIA/TIA562 to TTL )
t
LHR
(Figure 2)
q
0.3
0.8
s
Note 2: Supply current is measured with driver and receiver outputs
unloaded.
V
CC
= 3.3V, C1 = C2 = C3 = C4 = 0.1
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
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
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
F
for charge storage.
C1
+
, C1
, C2
+
, C2
: Commutating Capacitor Inputs. These
pins require two external capacitors C = 0.1
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
F
0.1
F
0.1
F
0.1
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
PDF 
ZIP