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LTC1348CSW#PBF

P1-P3P4-P6P7-P8
1
LTC1348
3.3V/5V Low Power RS232
3-Driver/5-Receiver Transceiver
S
F
EA
T
U
RE
D
U
ESCRIPTIO
■
Low Supply Current: 600µA at 3.3V
■
Supply Current in Shutdown: 0.2µA
■
Supply Current in Receiver Alive Mode: 15µA
■
ESD Protection over ±10kV
■
Operates from a Single 3V to 5.5V Supply
■
Operates to 120kBaud with 0.1µF Flying Capacitors
■
Three-State Outputs Are High Impedance When Off
■
Output Overvoltage Does Not Force Current
Back into Supplies
■
RS232 I/O Lines Can Be Forced to ±25V
Without Damage
■
Flowthrough Architecture
The LTC
®
1348 is a 3-driver/5-receiver RS232 transceiver
with very low supply current. The charge pump only
requires five 0.1µF capacitors. The LTC1348 provides full
RS232 output levels when operated over a wide supply
range of 3V to 5.5V
The transceiver operates in one of four modes: Normal,
Receiver Disable, Receiver Alive and Shutdown. In Normal
or Receiver Disable mode, I
CC
is only 600µA at 3.3V and
800µA at 5V in the no load condition. In Shutdown mode,
the supply current is further reduced to 0.2µA. In Receiver
Alive mode, all five receivers are kept alive and the supply
current is 15µA. All RS232 outputs assume a high imped-
ance state in Shutdown or Receiver Alive mode or with the
power off. The receiver outputs assume a high impedance
state in Receiver Disable or with the power off.
The LTC1348 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver oper-
ates up to 120kbaud with all drivers loaded with 1000pF,
3kΩ. Both driver outputs and receiver inputs can be forced
to ±25V without damage and can survive multiple ±10kV
ESD strikes.
U
S
A
O
PP
L
IC
AT
I
■
Notebook Computers
■
Palmtop Computers
■
Printers
■
Portable Instruments
LT1348 • TA01
C5
0.1µF
C2
0.1µF
C3
0.1µF
C4
0.1µF
LTC1348
1
2
3
4
5
6
7
8
9
10
11
12
13
14
DR 1 OUT
RX1 IN
DR 2 OUT
RX2 IN
RX3 IN
RX4 IN
DR 3 OUT
RX5 IN
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DR 1 IN
RX1 OUT
DR 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DR 3 IN
RX5 OUT
DREN
RXEN
V
–
V
+
V
CC
GND
C1
0.1µF
3-Drivers/5-Receivers with Shutdown
U
A
O
PP
L
IC
AT
ITY
P
I
CA
L
Supply Current
, LTC and LT are registered trademarks of Linear Technology Corporation.
TEMPERATURE (˚C)
–40
SUPPLY CURRENT (mA)
1.4
20
LT1348 •TA02
0.8
0.4
–20 0 40
0.2
0
1.6
1.2
1.0
0.6
SHUTDOWN CURRENT (µA)
1.4
0.8
0.4
0.2
0
1.6
1.2
1.0
0.6
60 80
QUIESCENT
CURRENT
SHUTDOWN
CURRENT
V
CC
= 5V
V
CC
= 3.3V
V
CC
= 3.3V
OR 5V
2
LTC1348
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER PART
NUMBER
LTC1348CG
LTC1348CSW
LTC1348IG
LTC1348ISW
(Note 1)
Supply Voltage (V
CC
) ................................................ 6V
Input Voltage
Driver ....................................... –0.3V to V
CC
+ 0.3V
Receiver ............................................... – 25V to 25V
Driver/Receiver Enable Pin ........ –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
LTC1348C................................................0°C to 70°C
LTC1348I............................................ –40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Consult factory for Military grade parts.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V
+
C2
+
C2
–
V
CC
C1
+
C1
–
DR1 OUT
RX1 IN
DR2 OUT
RX2 IN
RX3 IN
RX4 IN
DR3 OUT
RX5 IN
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
–
C3
+
C3
–
DR1 IN
RX1 OUT
DR2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DR3 IN
RX5 OUT
DREN
RXEN
GND
TOP VIEW
SW PACKAGE
28-LEAD PLASTIC SO
G PACKAGE
28-LEAD PLASTIC SSOP
T
JMAX
= 125°C, θ
JA
= 96°C/W (G)
T
JMAX
= 125°C, θ
JA
= 85°C/W (SW)
E
LECTR
IC
AL C CHARA TERIST
ICSCD
V
CC
= 3V to 5.5V, C1 to C4 = 0.1µF, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Any Driver
Output Voltage Swing V
CC
= 3.3V, 3k to GND Positive ● 5.0 6.2 V
Negative ● –5.0 – 6.0 V
Logic Input Voltage Level Input Low Level (V
OUT
= High) ● 0.8 V
Input High Level (V
OUT
= Low), V
CC
= 3.3V ● 2.0 V
Input High Level (V
OUT
= Low), V
CC
= 5V ● 2.4 V
Logic Input Current V
IN
= V
CC
● 5 µA
V
IN
= 0V ● –5 –35 µA
Output Short-Circuit Current V
OUT
= 0V ±12 mA
Output Leakage Current Shutdown (Note 3) or Receiver Alive Mode (Note 4), ● ±10 ±500 µA
V
OUT
= ±20V
Any Receiver
Input Voltage Thresholds Input Threshold (Receiver Alive Mode) 0.8 1.5 2.4 V
Input Low Threshold (Normal Mode) 0.8 1.3 V
Input High Threshold (Normal Mode) 1.7 2.4 V
Hysteresis Normal Mode 0.3 V
Input Resistance V
IN
= ±10V 3 5 7 kΩ
Output Voltage Output Low, I
OUT
= – 1.6mA ● 0.2 0.4 V
Output High, I
OUT
= 160µA ● V
CC
– 0.6V V
Output Short-Circuit Current Sinking Current, V
OUT
= V
CC
–3 –20 mA
Output Leakage Current Shutdown (Note 3), 0V ≤ V
OUT
≤ V
CC
● 110 µA
3
LTC1348
E
LECTR
IC
AL C CHARA TERIST
ICSCD
V
CC
= 3V to 5.5V, C1 to C4 = 0.1µF, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
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) V
CC
= 3.3V ● 0.6 2.0 mA
No Load (Note 2) V
CC
= 5V ● 0.8 2.5 mA
Receiver Alive Mode (Note 4) V
CC
= 3.3V or 5V ● 15 30 µA
Supply Leakage Current (V
CC
) Shutdown (Note 3) ● 0.2 10 µA
Driver/Receiver Enable Threshold Low ● 0.8 V
Driver/Receiver Enable Threshold High V
CC
= 3.3V ● 2.0 V
Driver/Receiver Enable Threshold High V
CC
= 5V ● 2.4 V
AC ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Maximum Data Rate R
L
= 3k, C
L
= 1000pF, One Driver Switching 120 250 kbps
Slew Rate V
CC
= 5V, R
L
= 3k, C
L
= 51pF 8 30 V/µs
V
CC
= 3.3V, R
L
= 3k, C
L
= 2500pF 3 V/µs
Driver Propagation Delay t
HLD
(Figure 1) ● 2.5 4 µs
(TTL to RS232) t
LHD
(Figure 1) ● 2.5 4 µs
Receiver Propagation Delay t
HLR
(Figure 2) (Normal Mode) ● 0.3 1 µs
(RS232 to TTL) t
LHR
(Figure 2) (Normal Mode) ● 0.2 1 µs
t
HLR
(Figure 2) (Receiver Alive Mode) ● 1.0 4 µs
t
LHR
(Figure 2) (Receiver Alive Mode) ● 0.2 4 µs
Note 3: Supply current measurement in Shutdown is performed with
V
DREN
and V
RXEN
= 0V.
Note 4: Supply current measurement in Receiver Alive mode is performed
with V
DREN
= 0V and V
RXEN
= V
CC
.
V
CC
= 3V to 5.5V, C1 to C4 = 0.1µF, unless otherwise noted.
The ● denotes specifications which apply over the full operating
temperature range (0°C ≤ T
A
≤ 70°C for Commercial grade and
–40°C ≤ T
A
≤ 85°C for Industrial grade).
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. The V
DREN
and V
RXEN
= V
CC
.
P1-P3P4-P6P7-P8

LTC1348CSW#PBF

Mfr. #:
Buy LTC1348CSW#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-232 Interface IC 3.3V True RS232 3Dx/5Rx Xcvr
Lifecycle:
New from this manufacturer.
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