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PDF LTC1385CN Data sheet ( Hoja de datos )
| Número de pieza | LTC1385CN | |
| Descripción | 3.3V Low Power EIA/TIA-562 Transceiver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1385
3.3V Low Power
EIA/TIA-562 Transceiver
FEATURES
s Operates from a Single 3.3V Supply
s Low Supply Current: ICC = 200µA
s ICC = 35µA in Driver Disable Mode
s ICC = 0.2µA in Shutdown Mode
s ESD Protection Over ±10kV
s Uses Small Capacitors: 0.1µF
s Operates to 120kBaud
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 Pin Compatible with LT1180A
APPLICATI S
s Notebook Computers
s Palmtop Computers
DESCRIPTIO
The LTC1385 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, ICC 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 ICC drops to 35µA. In the Shutdown mode, everything
is turned off and ICC 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.
TYPICAL APPLICATI
2-Drivers/2-Receivers with Shutdown
and Driver Disable
0.1µF
2
4 LTC1385
5
0.1µF
6 VCC
300k
LOGIC INPUT 12
VCC
300k
LOGIC INPUT 11
LOGIC OUTPUT 13
10
LOGIC OUTPUT
ON/OFF 18
5k
5k
1
DRIVER DISABLE
17
VCC = 3.3V
3
7
0.1µF
15
562 OUTPUT
8 562 OUTPUT
14
562 INPUT
9 562 INPUT
16
0.1µF
LTC1385 • TA01
Quiescent and Shutdown Supply Current
vs Temperature
600 1.2
500 1.0
400 0.8
300
QUIESCENT
CURRENT
0.6
200 0.4
100
0
– 20
SHUTDOWN
CURRENT
0.2
0 20 40 60
TEMPERATURE (°C)
0
80
TEST CONDITION: VCC = 3.3V
LTC1385 • TA02
1
1 page  
LTC1385
PI FU CTIO S
VCC: 3.3V Input Supply Pin. This pin should be decoupled
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 independent
of the Driver Disable pin. The supply current drops to
0.2µA and all driver and receiver outputs are forced into
three-state.
DRIVER DISABLE: TTL/CMOS Compatible Input Pin. With
the ON/OFF pin held high, a logic low forces the part into
the Driver Disable mode with the charge pump turned off
and the driver outputs forced into three-state. Both receiv-
ers remain active and the supply current drops to 35µA. A
logic high forces the part into the Normal mode.
V+: Positive Supply Output (EIA/TIA-562 Drivers).
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 share a common capacitor. For a large number
of devices, increasing the size of the shared common
storage capacitors is recommended to reduce ripple.
V–: Negative Supply Output (EIA/TIA-562 Drivers).
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 2Ω.
TR IN: EIA/TIA-562 Driver Input Pins. Inputs are TTL/
CMOS compatible. The inputs of unused drivers can be left
unconnected since 300k input pull-up resistors to VCC are
included on chip. To minimize power consumption, the
internal driver pull-up resistors are disconnected from VCC
in the Shutdown mode.
TR OUT: Driver Outputs at EIA/TIA-562 Voltage Levels.
Outputs are in a high impedance state when in the Shut-
down or Driver Disable 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. Outputs are in a high impedance state when in the
Shutdown mode.
UW
W
SWITCHI G TI E WAVEFOR S
DRIVER
INPUT
1.4V
DRIVER
OUTPUT
t LHD
0V
1.4V
t HLD
VCC
0V
V+
0V
V–
1385 F01
RX
INPUT
RX
OUTPUT
t LHR
1.7V
0.8V
VCC
1.3V
0V
t HLR
2.4V VCC
0V
1385 F02
Figure 1. Driver Propagation Delay Timing
Figure 2. Receiver Propagation Delay Timing
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1385CN.PDF ] | |
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