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PDF LTC1350I Data sheet ( Hoja de datos )
| Número de pieza | LTC1350I | |
| Descripción | 3.3V Low Power EIA/TIA-562 3-Driver/ 5-Receiver Transceiver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1350
3.3V Low Power
EIA/TIA-562 3-Driver/
5-Receiver Transceiver
FEATURES
s Low Supply Current
300µA
s Receivers 4 and 5 Kept Alive
in SHUTDOWN
35µA
s ESD Protection
±10kV
s Operates from a Single 3.3V Supply
s Uses Small Capacitors
0.1µF
s Operates to 120k Baud
s Three-State Outputs are High Impedance
When Off
s Output Overvoltage Does Not Force Current
Back into Supplies
s EIA/TIA-562 I/O Lines Can Be Forced to ±25V
Without Damage
s Flowthrough Architecture
APPLICATI S
s Notebook Computers
s Palmtop Computers
DESCRIPTIO
The LTC1350 is a 3-driver/5-receiver EIA/TIA-562 trans-
ceiver with very low supply current. In the no load condi-
tion, the supply current is only 300µA. The charge pump
only requires four 0.1µF capacitors.
In SHUTDOWN mode, two receivers are kept alive and
the supply current is only 35µA. All RS232 outputs
assume a high impedance state in SHUTDOWN or with
the power off.
The LTC1350 is fully compliant with all data rate and
overvoltage EIA/TIA-562 specifications. The transceiver
can operate up to 120k baud with a 1000pF and 3kΩ
load. Both driver outputs and receiver inputs can be
forced to ±25V without damage and can survive multiple
±10kV ESD strikes.
TYPICAL APPLICATI
3-Drivers/5-Receivers with Shutdown
V+ 1
2
VCC
C1+ 3
C1– 4
5
DR1 OUT
6
RX1 IN
7
DR2 OUT
8
RX2 IN
9
RX3 IN
10
RX4 IN
11
DR3 OUT
12
RX5 IN
13
ON/OFF
14
NC
LTC1350
28 V –
27 C2+
26 C2–
25
DR1 IN
24
RX1 OUT
23
DR2 IN
22
RX2 OUT
21
RX3 OUT
20
RX4 OUT
19
DR3 IN
18
RX5 OUT
17
GND
16
NC
15
NC
LTC1350 • TA01
Quiescent and Shutdown Supply Current vs Temperature
600
TEST CONDITION: VCC = 3.3V
ALL DRIVER INPUTS TIED TO VCC
500
85
75
400
QUIESCENT
CURRENT
300
65
55
200
SHUTDOWN CURRENT
100
45
35
0
–40 –20
0 20 40 60
TEMPERATURE (˚C)
0
80 100
LTC1350 • TA02
1
1 page  
LTC1350
PI FU CTIO S
VCC: 3.3V Input Supply Pin. Supply current is typically
35µA in the SHUTDOWN mode. This pin should be de-
coupled with a 0.1µF ceramic capacitor.
GND: Ground Pin.
ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic
low puts the device in the SHUTDOWN mode with receiv-
ers 4 and 5 kept alive and the supply current equal to 35µA.
All driver and other receiver outputs are in high impedance
state. This pin cannot float.
V+: Positive Supply Output. V+ ≅ 2VCC – 1V. This pin
requires an external capacitor (C = 0.1µF) for charge
storage. The capacitor may be tied to ground or VCC. With
multiple devices, the V + and V – pins may be paralleled into
common capacitors. For a large number of devices, in-
creasing the size of the shared common storage capaci-
tors is recommended to reduce ripple.
V–: Negative Supply Output. V – ≅ – (2VCC – 1.3V). This
pin requires an external capacitor (C = 0.1µF) for charge
storage.
C1+, C1–, C2+, C2–: Commutating Capacitor Inputs. These
pins require two external capacitors (C = 0.1µF): 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 20Ω.
DR IN: EIA/TIA-562 Driver Input Pins. Inputs are TTL/
CMOS compatible. Inputs should not be allowed to float.
Tie unused inputs to VCC.
DR OUT: Driver Outputs at EIA/TIA-562 Voltage Levels.
Outputs are in a high impedance state when in the SHUT-
DOWN mode or VCC = 0V. 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 Lev-
els. Receiver 1, 2 and 3 outputs are in a high impedance
state when in SHUTDOWN mode to allow data line sharing.
Receivers 4 and 5 are kept alive in SHUTDOWN.
UW
W
SWITCHI G TI E WAVEFOR S
DR
INPUT
1.4V
DR
OUTPUT
t LHD
0V
1.4V
t HLD
VCC
0V
V+
0V
V–
LTC1350 • F01
Figure 1. Driver Propagation Delay Timing
RX
INPUT
1.7V
RX
OUTPUT
t LHR
0.8V
VCC
1.3V
0V
t HLR
2.4V VCC
0V
LTC1350 • F02
Figure 2. Receiver Propagation Delay Timing
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1350I.PDF ] | |
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