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LTC1384CSW#PBF

P1-P3P4-P6P7-P8
1
LTC1384
1384fa
The LTC
®
1384 is an ultra-low power 2-driver/2-receiver
RS232 transceiver that operates from a single 5V
supply. The charge pump requires only four space-
saving 0.1µF capacitors.
The transceiver operates in one of two modes, Normal and
Shutdown. In the Normal mode, I
CC
is only 220µA with the
driver outputs unloaded. In the Shutdown mode, the
charge pump is turned off, the driver outputs are forced
into three-state, both receivers are kept active and I
CC
drops to 35µA. The receiver outputs may be forced into
three-state at any time using the receiver enable (RX EN)
pin.
The LTC1384 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120kbaud with a 2500pF, 3kΩ load. Both
driver outputs and receiver inputs can be forced to
±25V without damage and can survive multiple ±10kV
ESD strikes.
5V Low Power RS232
Transceiver with 2 Receivers
Active in Shutdown
■
Operates from a Single 5V Supply
Low Supply Current: I
CC
= 220µA
■
I
CC
= 35µA in Shutdown Mode with Both
Receivers Kept Alive
■
ESD Protection Over ±10kV
■
Uses Small Capacitors: 0.1µF
■
Operates to 120kBaud
■
Output Overvoltage Does Not Force Current
Back into Supplies
■
RS232 I/O Lines Can Be Forced to ±25V
Without Damage
■
Pin Compatible with LT1180A
■
Notebook Computers
■
Palmtop Computers
2-Drivers/2-Receivers with Shutdown
and Receiver Enable
Quiescent and Shutdown Supply Current
vs Temperature
TEMPERATURE (°C)
–20
0
QUIESCENT CURRENT (µA)
200
400
600
800
1200
0
20 40 60
LTC1384 • TA02
80
1000
TEST CONDITION: V
CC
= 5V
0
SHUTDOWN CURRENT (µA)
10
20
30
40
60
50
QUIESCENT
CURRENT
SHUTDOWN
CURRENT
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1384 • TA01
LTC1384
2
4
0.1µF
17
V
CC
= 5V
3
0.1µF
7
0.1µF
0.1µF
5
6
232 OUTPUT
15
8
232 OUTPUT
14
232 INPUT
5k
9
232 INPUT
16
12
11
13
10
LOGIC INPUT
LOGIC INPUT
LOGIC OUTPUT
LOGIC OUTPUT
5k
18
ON/OFF
RX EN
1
300k
V
CC
300k
V
CC
2
LTC1384
1384fa
Supply Voltage (V
CC
) ................................................ 6V
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
LTC1384C ............................................... 0°C to 70°C
LTC1384I............................................ – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART
NUMBER
ORDER PART
NUMBER
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC1384CG
LTC1384IG
1
2
3
4
5
6
7
8
9
10
TOP VIEW
G PACKAGE
20-LEAD SSOP
20
19
18
17
16
15
14
13
12
11
C1
+
V
+
C1
–
C2
+
C2
–
V
–
TR2 OUT
RX2 IN
NC
ON/OFF
VCC
GND
TR1 OUT
RX1 IN
RX1 OUT
TR1 IN
TR2 IN
RX2 OUT
NC
RX EN
T
JMAX
= 125°C, θ
JA
= 135°C/W
T
JMAX
= 125°C, θ
JA
= 65°C/W
1
2
3
4
5
6
7
8
9
TOP VIEW
SW PACKAGE
18-LEAD PLASTIC SO
18
17
16
15
14
13
12
11
10
RX EN
C1
+
V
+
C1–
C2
+
C2–
V–
TR2 OUT
RX2 IN
ON/OFF
V
CC
GND
TR1 OUT
RX1 IN
RX1 OUT
TR1 IN
TR2 IN
RX2 OUT
N PACKAGE
18-LEAD PDIP
LTC1384CN
LTC1384CSW
LTC1384IN
LTC1384ISW
DC ELECTRICAL CHARACTERISTICS
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
OUT
= High) ● 1.4 0.8 V
Input High Level (V
OUT
= Low) ● 2.0 1.4 V
Logic Input Current V
IN
= V
CC
● 5 µA
V
IN
= 0V ● –20 –40 µA
Output Short-Circuit Current V
OUT
= 0V ±9 ±12 mA
Output Leakage Current Shutdown or V
CC
= 0V (Note 3), V
OUT
= ±10V ● ±10 ±500 µA
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
IN
≤ 10V 3 5 7 kΩ
Output Voltage Output Low, I
OUT
= – 1.6mA (V
CC
= 5V) ● 0.2 0.4 V
Output High, I
OUT
= 160µA (V
CC
= 5V) ● 3.0 3.2 V
T
JMAX
= 125°C, θ
JA
= 85°C/W
PACKAGE/ORDER I FOR ATIO
UU
W
ABSOLUTE AXI U RATI GS
WWWU
The ● denotes specifications which apply over the full operating
temperature range. V
CC
= 5V, C1 = C2 = C3 = C4 = 0.1µF, V
ON/OFF
= V
CC
, RX EN = 0V, unless otherwise noted.
3
LTC1384
1384fa
DC ELECTRICAL CHARACTERISTICS
AC CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: Supply current is measured with driver and receiver outputs
unloaded.
Note 3: Measurements made in the Shutdown mode are performed
with V
ON/OFF
= 0V.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Slew Rate R
L
= 3k, C
L
= 51pF 8 30 V/µs
R
L
= 3k, C
L
= 2500pF 3 5 V/µs
Driver Propagation Delay t
HLD
(Figure 1) ● 2 3.5 µs
(TTL to RS232) t
LHD
(Figure 1) ● 2 3.5 µs
Receiver Propagation Delay t
HLR
(Figure 2) ● 0.3 0.8 µs
(RS232 to TTL) t
LHR
(Figure 2) ● 0.3 0.8 µs
Driver Output Voltage
vs Temperature
TEMPERATURE (˚C)
0
THRESHOLD VOLTAGE (V)
1.8
2.0
2.2
30 50
V
TH
V
TL
1.6
1.4
10 20
40 60 70
1.2
1.0
DATA RATE (kBAUD)
0
0
SUPPLY CURRENT (mA)
5
15
20
25
100
45
10
50
25
125
75 150 175
30
35
40
V
CC
= 5V
R
L
= 3k
C
L
= 2500pF
2 DRIVERS ACTIVE
Receiver Input Thresholds
vs Temperature Supply Current vs Data Rate
TYPICAL PERFOR A CE CHARACTERISTICS
UW
TEMPERATURE (°C)
0
–8
DRIVER OUTPUT VOLTAGE (V)
–6
–2
0
2
40
10
–4
20
10
50 60
30 70
4
6
8
R
L
= 3k
V
CC
= 5V
V
CC
= 4.5V
OUTPUT HIGH
V
CC
= 4.5V
V
CC
= 5V
OUTPUT LOW
The ● denotes specifications which apply over the full operating temperature range.
V
CC
= 5V, C1 = C2 = C3 = C4 = 0.1µF,unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Short-Circuit Current Sinking Current, V
OUT
= V
CC
–15 –40 mA
Sourcing Current, V
OUT
= 0V 10 20 mA
Output Leakage Current EN = V
CC
, 0V ≤ V
OUT
≤ V
CC
● 110 µA
Power Supply Generator
V
+
Output Voltage I
OUT
= 0mA 8.0 V
I
OUT
= 8mA 7.5 V
V
–
Output Voltage I
OUT
= 0mA –8.0 V
I
OUT
= –8mA –7.0 V
Supply Rise Time Shutdown to Turn-On 0.2 ms
Power Supply
V
CC
Supply Current No Load (Note 2), 0°C to 70°C ● 0.22 0.5 mA
No Load (Note 2), –40°C to 85°C ● 0.35 1.0 mA
Supply Leakage Current (V
CC
)Shutdown (Note 3) ● 35 50 µA
Digital Input Threshold Low ● 1.4 0.8 V
Digital Input Threshold High ● 2.0 1.4 V
The ● denotes specifications which apply over the full operating
temperature range. V
CC
= 5V, C1 = C2 = C3 = C4 = 0.1µF, V
ON/OFF
= V
CC
, RX EN = 0V, unless otherwise noted.
P1-P3P4-P6P7-P8

LTC1384CSW#PBF

Mfr. #:
Buy LTC1384CSW#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-232 Interface IC 5V 2Dx/2Rx RS232w/ 2Rx KeepAlive
Lifecycle:
New from this manufacturer.
Delivery:
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