LTC1338 Linear Technology, LTC1338 Datasheet - Page 5

• Manufacturer Part Number: LTC1338
• Description: 5V Low Power RS232 5-Driver/3-Receiver Transceiver
• Manufacturer: Linear Technology

PI FU CTIO S
OUTPUT
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 SHUT-
DOWN, RECEIVER ALIVE mode or V
outputs are protected against ESD to 10kV for human
body model discharges.
Table 1. Functional Description
MODE
SHUTDOWN
Receiver Disable
RECEIVER ALIVE
Normal
DRIVER
DRIVER
S
INPUT
WITCHI
U
t
LHD
Figure 1. Driver Propagation Delay Timing
1.4V
U
U
G
RX ENABLE
0V
TI
U
0
0
1
1
CC
W
.
E WAVEFOR
DR ENABLE
0
1
0
1
CC
= 0V. The driver
1.4V
DRIVERS
All driver outputs are
high impedance.
All drivers alive.
All driver outputs are
high impedance.
All drivers alive.
t
HLD
W
S
0V
LTC1338 • F01
V
0V
V
V
CC
+
–
OUTPUT
INPUT
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 SHUT-
DOWN or RECEIVER DISABLE mode to allow data line
sharing.
RX
RX
t
LHR
Figure 2. Receiver Propagation Delay Timing
RECEIVERS
All receiver outputs are
high impedance.
All receiver outputs are
high impedance.
All receivers alive.
All receivers alive.
1.7V
0.8V
1.3V
LTC1338
I
CC
t
( A)(TYP)
HLR
500
500
0.2
50
2.4V
LTC1338 • F02
5
V
0V
V
0V
CC
CC