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LTC1385 Datasheet(PDF) 5 Page - Linear Technology

Part No. LTC1385
Description  3.3V Low Power EIA/TIA-562 Transceiver
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC1385 Datasheet(HTML) 5 Page - Linear Technology

   
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5
LTC1385
VCC: 3.3V Input Supply Pin. This pin should be decoupled
with a 0.1
µF 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
0.2
µA 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 35
µA. 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 = 0.1
µF 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 = 0.1
µF for charge storage.
PI FU CTIO S
C1+, C1, C2+, C2: Commutating Capacitor Inputs. These
pins require two external capacitors C = 0.1
µF: 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 2
Ω.
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.
SWITCHI G TI E WAVEFOR S
1.4V
0V
VCC
0V
V+
V
0V
DRIVER
INPUT
DRIVER
OUTPUT
1.4V
t HLD
t LHD
1385 F01
Figure 1. Driver Propagation Delay Timing
0.8V
VCC
0V
2.4V
RX
INPUT
RX
OUTPUT
1.3V
t HLR
1.7V
t LHR
1385 F02
VCC
0V
Figure 2. Receiver Propagation Delay Timing


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