LTC1337C Linear Technology, LTC1337C Datasheet - Page 5

• Manufacturer Part Number: LTC1337C
• Description: 5V Low Power RS232 3-Driver/5-Receiver Transceiver
• Manufacturer: Linear Technology

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 SHUT-
DOWN mode or V
against ESD to 10kV for human body model discharges.
S
OUTPUT
TEST CIRCUITS
DRIVER
DRIVER
INPUT
WITCHI
U
DRIVER
INPUT
t
Figure 4. Receiver Timing Test Load
LHD
Figure 3. Driver Timing Test Load
Figure 1. Driver Propagation Delay Timing
U
1.4V
RX IN
U
G
DRIVER
CC
0V
TI
= 0V. The driver outputs are protected
RX
U
W
CC
.
OUTPUT
E WAVEFOR
DRIVER
OUTPUT
RX
51pF
1337 F04
51pF
1337 F03
3k
1.4V
t
W
HLD
S
0V
1337 F01
PROTECTED
V
V
V
0V
LINE PINS
TO ±10kV
CC
+
–
RS232
0.1 F
OUTPUT
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 mode to allow data line sharing.
C1
RX IN
RX
DRIVER 1 OUT
DRIVER 2 OUT
DRIVER 3 OUT
t
0.1 F
LHR
Figure 2. Receiver Propagation Delay Timing
C2
ON/OFF
RX1 IN
RX2 IN
RX3 IN
RX4 IN
RX5 IN
V
V
+
CC
1.7V
10
11
12
13
14
0.8V
1
2
3
4
5
6
7
8
9
ESD Test Circuit
LTC1337
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT
V
GND
–
1.3V
LTC1337
C3
0.1 F
t
HLR
1337 TC01
0V
C4
0.1 F
1337 F02
5
V
0V
V
0V
CC
CC