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LTC1385ISW#PBF

P1-P3P4-P6P7-P8
1
LTC1385
sn1385 1385fas
3.3V Low Power
EIA/TIA-562 Transceiver
■
Operates from a Single 3.3V Supply
■
Low Supply Current: I
CC
= 200µA
■
I
CC
= 35µA in Driver Disable Mode
■
I
CC
= 0.2µA in Shutdown Mode
■
ESD Protection Over ±10kV
■
Uses Small Capacitors: 0.1µF
■
Operates to 120kBaud
■
Output Overvoltage Does Not Force Current
Back into Supplies
■
EIA/TIA-562 I/O Lines Can Be Forced to ±25V
Without Damage
■
Pin Compatible with LT1180A
The LTC
®
1385 is an ultra-low power, 2-driver/2-receiver
EIA/TIA-562 transceiver which operates from a single
3.3V supply. The charge pump requires only four space-
saving 0.1µF capacitors.
The transceiver operates in one of three modes: Normal,
Driver Disable or Shutdown. In the Normal mode, I
CC
is
only 200µA in the unloaded condition. In the Driver Disable
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. In the Shutdown mode, everything
is turned off and I
CC
drops to 0.2µA.
The LTC1385 is fully compliant with all data rate and
overvoltage EIA/TIA-562 specifications. The transceiver
can operate up to 120kbaud with a 1000pF, 3kΩ load.
Both driver outputs and receiver inputs can be forced to
±25V without damage, and can survive multiple ±10kV
ESD strikes.
■
Notebook Computers
■
Palmtop Computers
Quiescent and Shutdown Supply Current
vs Temperature
2-Drivers/2-Receivers with Shutdown
and Driver Disable
TEMPERATURE (°C)
QUIESCENT CURRENT (µA)
600
500
400
300
200
100
0
20
40
60
LTC1385 • TA02
800
1.2
1.0
0.8
0.6
0.4
0.2
0
SHUTDOWN CURRENT (µA)
QUIESCENT
CURRENT
SHUTDOWN
CURRENT
TEST CONDITION: V
CC
= 3.3V
–20
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1385 • TA01
0.1µF
0.1µF
0.1µF
0.1µF
LTC1385
DRIVER DISABLE
2
4
5
6
12
11
13
10
18
14
9
16
1
LOGIC INPUT
LOGIC INPUT
LOGIC OUTPUT
LOGIC OUTPUT
ON/OFF
17
3
7
15
562 OUTPUT
V
CC
= 3.3V
562 OUTPUT
562 INPUT
562 INPUT
5k
5k
300k
V
CC
300k
V
CC
8
2
LTC1385
sn1385 1385fas
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
LTC1385C ............................................. 0°C to 70°C
LTC1385I........................................... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Any Driver
Output Voltage Swing 3k to GND Positive ● 3.7 4.5 V
Negative ● –3.7 – 4.5 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 ±10 mA
Output Leakage Current Shutdown or Driver Disable or V
CC
= 0V (Note 3,4), ● ±10 ±500 µA
V
OUT
= ±20V
ABSOLUTE AXI U RATI GS
WWWU
DC ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range. V
CC
= 3.3V, C1 = C2 = C3 = C4 = 0.1µF, V
ON/OFF
= V
CC
, Driver Disable = V
CC
, unless noted.
LTC1385CG
LTC1385IG
ORDER PART
NUMBER
ORDER PART
NUMBER
LTC1385CN
LTC1385CSW
LTC1385IN
LTC1385ISW
Consult LTC Marketing for parts specified with wider operating temperature ranges.
T
JMAX
= 125°C, θ
JA
= 135°C/W
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
DRIVER
DISABLE
T
JMAX
= 125°C, θ
JA
= 85°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
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
DRIVER
DISABLE
PACKAGE/ORDER I FOR ATIO
UU
W
3
LTC1385
sn1385 1385fas
PARAMETER CONDITIONS MIN TYP MAX UNITS
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 1.0 V
Input Resistance –10V ≤ V
IN
≤ 10V 3 5 7 kΩ
Output Voltage Output Low, I
OUT
= – 1.6mA (V
CC
= 3.3V) ● 0.2 0.4 V
Output High, I
OUT
= 160µA (V
CC
= 3.3V) ● 3.0 3.2 V
Output Short-Circuit Current Sinking Current, V
OUT
= V
CC
–5 –20 mA
Sourcing Current, V
OUT
= 0V 2 7 mA
Output Leakage Current Shutdown (Note 4), 0V ≤ V
OUT
≤ V
CC
● 110 µA
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
Supply Rise Time Shutdown or Driver Disable to Turn-On 0.2 ms
Power Supply
V
CC
Supply Current No Load (Note 2), 0°C to 70°C ● 0.2 0.5 mA
No Load (Note 2), – 40°C to 85°C ● 3.5 1.0 mA
Supply Leakage Current (V
CC
) Shutdown (Note 4) ● 0.2 10 µA
Driver Disable (Note 3) ● 35 50 µA
Digital Input Threshold Low ● 1.4 0.8 V
Digital Input Threshold High ● 2.0 1.4 V
DC ELECTRICAL CHARACTERISTICS
AC CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Slew Rate R
L
= 3k, C
L
= 51pF 8 30 V/µs
R
L
= 3k, C
L
= 1000pF 3 5 V/µs
Driver Propagation Delay t
HLD
(Figure 1) ● 2 3.5 µs
(TTL to EIA/TIA-562) t
LHD
(Figure 1) ● 2 3.5 µs
Receiver Propagation Delay t
HLR
(Figure 2) ● 0.3 0.8 µs
(EIA/TIA-562 to TTL) t
LHR
(Figure 2) ● 0.2 0.8 µs
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 Driver Disable mode are performed
with V
DRIVER DISABLE
= GND and V
ON/OFF
= V
CC
.
Note 4: Measurements made in the Shutdown mode are performed with
V
ON/OFF
= 0V.
The ● denotes specifications which apply over the full operating temperature range.
V
CC
= 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless noted.
The ● denotes specifications which apply over the full operating
temperature range. V
CC
= 3.3V, C1 = C2 = C3 = C4 = 0.1µF, V
ON/OFF
= V
CC
, Driver Disable = V
CC
, unless noted.
P1-P3P4-P6P7-P8

LTC1385ISW#PBF

Mfr. #:
Buy LTC1385ISW#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-232 Interface IC 3V 2Dx/2Rx RS232 w/ 2Rx KeepAlive
Lifecycle:
New from this manufacturer.
Delivery:
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