LTC1334 LINER [Linear Technology], LTC1334 Datasheet - Page 7

• Manufacturer Part Number: LTC1334
• Description: Single 5V RS232/RS485 Multiprotocol Transceiver
• Manufacturer: LINER [Linear Technology]

FU CTIO TABLES
PI FU CTIO S
RS485 Receiver Mode
*See Note 5 of Electrical Characteristics table.
RS485 Driver Mode
R
R
D
RS485 Driver Enable with internal pull-up in RS485 mode.
D
ON/OFF (Pin 20): A high logic input enables the transceiv-
ers. A low puts the device into shutdown mode and
reduces I
LB (Pin 21): Loopback Control Input. A low logic level
enables internal loopback connections. This pin has an
internal pull-up.
D
D
RS485 Driver Enable with internal pull-up in RS485 mode.
R
R
V
ON/OFF
CC
B2
A2
Z2
Y2
Y1
Z1
A1
B1
ON/OFF
U
1
1
1
1
0
U
/DE2 (Pin 18): RS232 Driver Input in RS232 Mode.
/DE1 (Pin 23): RS232 Driver Input in RS232 Mode.
(Pin 19): Driver Input.
(Pin 16): Receiver Output.
(Pin 17): Receiver Output.
(Pin 22): Driver Input.
(Pin 24): Receiver Output.
(Pin 25): Receiver Output.
(Pin 26): Positive Supply; 4.75V V
1
1
1
0
CC
SEL
U
1
1
1
1
1
INPUTS
to 10 A. This pin has an internal pull-up.
U
INPUTS
SEL
DE
X
1
1
1
0
1
1
1
1
U
D
0
1
X
X
X
Inputs Open
CONDITIONS
Thermal Fault
< – 0.2V
> 0.2V
B – A
No Fault
No Fault
X
X
X
CC
R
Z
0
1
Z
Z
Z
0
1
1
Z
5.25V
OUTPUTS
OUTPUTS
A
R
1
1
1
Z
Y
B
1
0
Z
Z
Z
*
RS232 Receiver Mode
C2
nal. Requires 0.1 F external capacitor between Pins 27
and 28.
C2
RS232 Driver Mode
ON/OFF
ON/OFF
–
+
1
1
1
0
(Pin 28): Commutating Capacitor C2 Positive Terminal.
(Pin 27): Commutating Capacitor C2 Negative Termi-
1
1
1
0
INPUTS
SEL1
SEL
SEL2
GND
V
C1
C1
0
0
0
0
DD
A1
B1
Y1
Y2
B2
A2
Z1
Z2
+
–
INPUTS
10
11
12
13
14
SEL
1
2
3
4
5
6
7
8
9
0
0
0
0
D
0
1
X
X
Inputs Open
Thermal Fault
CONDITIONS
No Fault
No Fault
A, B
0
1
X
X
28
27
26
25
24
23
22
21
20
19
18
17
16
15
C2
C2
V
R
R
D
D
LB
ON/OFF
D
D
R
R
V
CC
EE
B1
A1
Z1
Y1
Y2
Z2
A2
B2
+
–
LTC1334
/DE1
/DE2
OUTPUTS
OUTPUTS
R
Y, Z
A
1
0
Z
Z
, R
1
0
1
Z
B
7