Datasheet

LTC2870/LTC2871
9
28701fb
For more information www.linear.com/LTC2870
RS232 Operation at 500kbps RS485 Operation at 20Mbps LTC2870 Drivers Changing Modes
WRAPPING DATA
DOUT LOADS: 5kΩ + 50pF
5V/DIV
28701 G16
1µs/DIV
DOUT1
DOUT2
ROUT1
ROUT2
DIN1
DIN2
H/F HIGH
Y, Z LOADS: 120Ω (DIFF) + 50pF
1V/DIV
5V/DIV
28701 G17
20ns/DIV
RO
Y
DI
Z
5V/DIV
5V/DIV
28701 G18
2µs/DIV
RS232
MODE
RS485
MODE
RS232
MODE
Y
485/232
Z
Typical perForMance characTerisTics
RS232 Driver Outputs Enabling
and Disabling V
DD
and V
EE
Powering Up V
DD
and V
EE
Ripple
5V/DIV
2V/DIV
28701 G20
40µs/DIV
FEN
VDD
VEE
5V/DIV
28701 G19
40µs/DIV
TOP CURVES: FAST ENABLE ↔ DX232
BOTTOM CURVES: SHUTDOWN ↔ DX232
FEN = 1
FEN = 0
DOUT1
DOUT2
DOUT1
DX232
DOUT2
10mV/DIV
28701 G21
40µs/DIV
FAST ENABLE MODE,
ALL DRIVERS AND RECEIVERS DISABLED.
VDD RIPPLE
VEE RIPPLE
T
A
= 25°C, V
CC
= V
L
= 3.3V, unless otherwise noted.
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