LTC2871IFE#PBF Linear Technology, LTC2871IFE#PBF Datasheet - Page 9

• Manufacturer Part Number: LTC2871IFE#PBF
• Description: IC, RS232-RS485 TXRX, 200MBPS, 5.5V, TSSOP-38
• Manufacturer: Linear Technology

Specifications of LTC2871IFE#PBF

• Device Type: Transceiver
• No. Of Drivers: 2
• Supply Voltage Range: 3V To 5.5V
• Driver Case Style: TSSOP
• No. Of Pins: 38
• Operating Temperature Range: -40°C To +85°C
• Rohs Compliant: Yes
• Ic Interface Type: RS232, RS485

PIN FUNCTIONS
TYPICAL PERFORMANCE CHARACTERISTICS
PIN NAME
V
V
V
V
GND
CAP
SW
A
B
RA
RB
RO
RIN1
RIN2
ROUT1
ROUT2
DIN1
DIN2
CC
L
DD
EE
5V/DIV
TOP CURVES: FAST ENABLE
BOTTOM CURVES: SHUTDOWN
RS232 Driver Outputs Enabling
and Disabling
16, 20, 24
DOUT2
DOUT2
DX232
DOUT1
DOUT1
1, 12, 29
LTC2870
10, 13,
18, 23
QFN
25
15
11
14
22
21
2
3
40μs/DIV
19, 23, 27
LTC2870
4, 15, 29
TSSOP
13, 16,
21, 26
28
18
14
17
25
24
5
6
DX232
FEN = 1
FEN = 0
DX232
21, 27, 33
1, 12, 16,
LTC2871
14, 17,
19, 39
25, 32
28701 G19
QFN
35
20
15
18
29
28
34
31
30
2
3
8
9
25, 31, 37 Input Supply (3V to 5.5V). Tie all three pins together and connect a 2.2μF or larger
5, 16, 20,
LTC2871
2V/DIV
5V/DIV
TSSOP
18, 21,
23, 39
29, 36
24
19
22
33
32
38
35
34
12
13
1
6
7
V
DD
DESCRIPTION
capacitor between V
Logic Supply (1.7V to 5.5V) for the receiver outputs, driver inputs, and control inputs.
Bypass this pin to GND with a 0.1μF capacitor if not tied tot V
proper operation. However, V
maximum limits are respected.
Generated Positive Supply Voltage for RS232 Driver (+7V). Connect 1μF capacitor
between V
Generated Negative Supply Voltage for RS232 Driver (–6.3V). Tie all pins together and
connect 1μF capacitor between V
Ground. Tie all four pins together.
Charge Pump Capacitor for Generated Negative Supply Voltage. Connect a 220nF
capacitor between CAP and SW.
Switch Pin. Connect 10μH inductor between SW and V
RS485 Positive Receiver Input (Full-Duplex Mode) or RS232 Receiver Input 1 (LTC2870).
RS485 Negative Receiver Input (Full-Duplex Mode) or RS232 Receiver Input 2 (LTC2870).
RS485 Differential Receiver Output or RS232 Receiver Output 1.
RS232 Receiver Output 2.
RS485 Differential Receiver Output.
RS232 Receiver Input 1.
RS232 Receiver Input 2.
RS232 Receiver Output 1.
RS232 Receiver Output 2.
RS232 Driver Input 1.
RS232 Driver Input 2.
and V
FEN
EE
DD
Powering Up
40μs/DIV
and GND.
CC
(adjacent to V
L
VDD
VEE
28701 G20
T
> V
A
EE
= 25°C, V
CC
(adjacent to the CAP pin) and GND.
DD
will not damage the device, provided that absolute
10mV/DIV
) and GND.
LTC2870/LTC2871
CC
= V
FAST ENABLE MODE,
ALL DRIVERS AND RECEIVERS DISABLED.
V
DD
L
= 3.3V, unless otherwise noted.
and V
CC
.
EE
CC
Ripple
. Keep V
40μs/DIV
L
≤ V
VDD RIPPLE
VEE RIPPLE
CC
for
28701 G21
28701f
9