LTC1347 Linear Technology, LTC1347 Datasheet - Page 5

• Manufacturer Part Number: LTC1347
• Description: 5V Low Power RS232 3-Driver/5-Receiver Transceiver with 5 Receivers Active in Shutdown
• Manufacturer: Linear Technology

PI FU CTIO S
C1
pins require two external capacitors C = 0.1 F: one from
C1
charge pump efficiency, the capacitor’s effective series
resistance should be less than 2 .
DRIVER IN: RS232 Driver Input Pins. Inputs are TTL/
CMOS compatible. Inputs should not be allowed to float.
Tie unused inputs to V
DRIVER OUT: Driver Outputs at RS232 Voltage Levels.
Outputs are in a high impedance state when in shutdown
SWITCHI G TI E WAVEFOR S
+
+
U
, C1
to C1
–
, C2
–
U
, and another from C2
+
, C2
U
–
: Commutating Capacitor Inputs. These
U
CC
W
.
OUTPUT
OUTPUT
DRIVER
DRIVER
INPUT
INPUT
RX
RX
+
to C2
t
LHR
Figure 1. Driver Propagation Delay Timing
t
LHD
Figure 2. Receiver Propagation Delay Timing
1.4V
–
. To maintain
1.7V
W
0.8V
0V
mode or V
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. All receivers are kept alive in shutdown.
CC
1.4V
1.3V
= 0V. The driver outputs are protected against
t
t
HLR
HLD
2.4V
0V
1347 F02
1347 F01
V
0V
V
0V
V
V
V
0V
CC
CC
CC
+
–
LTC1347
5