MAX1484EUB+ Maxim Integrated Products, MAX1484EUB+ Datasheet - Page 12

• Manufacturer Part Number: MAX1484EUB+
• Description: IC TXRX RS485/RS422 10-UMAX
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX1484EUB+

• Number Of Drivers/receivers: 1/1
• Protocol: RS422, RS485
• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Low-power shutdown mode is initiated by bringing both
RE high and DE low. In shutdown, the MAX1481 typi-
cally draws only 0.1µA of supply current.
RE and DE may be driven simultaneously; the parts are
guaranteed not to enter shutdown if RE is high and DE
is low for less than 50ns. If the inputs are in this state
for at least 600ns, the parts are guaranteed to enter
shutdown.
Enable times t_
istics tables assume the part was not in low-power shut-
down. Enable times t_
the parts were shut down. It takes drivers and receivers
Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,
12Mbps, RS-485/RS-422 Transceivers in µMAX Package
Figure 11. Receiver Propagation Delays
Figure 13. Receiver Propagation Delay Test Circuit
12
-1V
RO
1V
V
V
______________________________________________________________________________________
OH
OL
A
B
ATE
ZH
and t_
Low-Power Shutdown Mode
1.5V
V
ZH
ID
R
(SHDN)
PHL
Z
L
INPUT
in the Switching Character-
OUTPUT
and t_
R
PLH
(MAX1481 only)
B
A
ZL
R
R
(SHDN)
1.5V
RECEIVER
OUTPUT
assume
longer to become enabled from the low-power shutdown
mode (t_
driver/receiver disable mode (t_
Excessive output current and power dissipation caused
by faults or by bus contention are prevented by two
mechanisms. A foldback current limit on the output
stage provides immediate protection against short cir-
cuits over the whole common-mode voltage range (see
Typical Operating Characteristics ). In addition, a ther-
mal shutdown circuit forces the driver outputs into a
high-impedance state if the die temperature becomes
excessive.
Figure 12. Receiver Enable and Disable Times
(MAX1481/MAX1484 only)
Figure 14. Driver Output Waveform and FFT Plot of
MAX1484/MAX1486 Transmitting a 20kHz signal
RO
RO
RE
V
3V
0V
CC
0V
20dB/div
1.5V
ZH
0Hz
(SHDN)
1.5V
1.5V
, t_
R
R
ZL(SHDN)
ZH(SHDN)
OUTPUT NORMALLY HIGH
OUTPUT NORMALLY LOW
Driver Output Protection
250kHz/div
Z
L(SHDN)
, R
, R
ZL
ZH
ZH
, t_
R
R
) than from the
HZ
Z
LZ
L
).
2.5MHz
1.5V
V
V
OL
OH
+ 0.5V
- 0.5V