LTC1349 LINER [Linear Technology], LTC1349 Datasheet - Page 5

• Manufacturer Part Number: LTC1349
• Description: 5V Low Power RS232 3-Driver/5-Receiver Transceiver with 2 Receivers Active in Shutdown
• Manufacturer: LINER [Linear Technology]

SWITCHI G TI E WAVEFOR S
PI FU CTIO S
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
mode or V
ESD to ±10kV for human body model discharges.
TEST CIRCUITS
U
CC
U
= 0V. The driver outputs are protected against
DRIVER
U
INPUT
Driver Timing Test Load
U
W
DRIVER
CC
.
OUTPUT
OUTPUT
DRIVER
DRIVER
OUTPUT
DRIVER
INPUT
INPUT
RX
RX
51pF
t
LTC1349 • TA03
LHR
Figure 2. Receiver Propagation Delay Timing
t
LHD
Figure 1. Driver Propagation Delay Timing
1.4V
3k
1.7V
W
0.8V
0V
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.
1.4V
1.3V
RX INPUT
t
t
HLD
HLR
Receiver Timing Test Load
0V
2.4V
LTC1349 • F01
LTC1349 • F02
V
0V
V
V
V
0V
V
0V
CC
CC
CC
+
–
RX
OUTPUT
RX
LTC1349 • TA04
51pF
LTC1349
1349fa
5