MAX3218EAP+T Maxim Integrated Products, MAX3218EAP+T Datasheet - Page 9

• Manufacturer Part Number: MAX3218EAP+T
• Description: IC TXRS RS-232 W/SHTDWN 20SSOP
• Manufacturer: Maxim Integrated Products
• Type: Line Transceiverr

Specifications of MAX3218EAP+T

• Number Of Drivers/receivers: 2/2
• Protocol: RS232
• Voltage - Supply: 1.8 V ~ 4.25 V
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 4. AutoShutdown Trip Levels
(b)
(a)
RECEIVER
VOLTAGE
OUTPUT
INVALID
INPUT
(V)
(V)
+2.8V
+0.3V
-0.3V
-2.8V
V
V
CC
V+
CC
0V
V-
0
0V
1µA Supply Current, 1.8V to 4.25V-Powered
AUTOSHUTDOWN, TRANSMITTERS DISABLED,
RS-232 Transceiver with AutoShutdown™
TRANSMITTERS ENABLED, INVALID HIGH
TRANSMITTERS ENABLED, INVALID HIGH
1 A SUPPLY CURRENT, INVALID LOW
_______________________________________________________________________________________
t
INVL
INDETERMINATE
INDETERMINATE
t
WU
t
INVH
INVALID
REGION
Keep communications cables short to minimize capaci-
tive loading. Lowering the capacitive loading on the
transmitter outputs reduces the MAX3218’s power con-
sumption. Using short, low-capacitance cable also
helps transmission at the highest data rates.
RS-232 circuits consume much of their power because
the EIA/TIA-232E standard demands that the transmit-
ters deliver at least 5V to receivers with impedances
that can be as low as 3k Ω. For applications where
power consumption is critical, the EIA/TIA-562 standard
provides an alternative.
EIA/TIA-562 transmitter output voltage levels need only
reach ±3.7V, and because they have to drive the same
3kΩ receiver loads, the total power consumption is con-
siderably reduced. Since the EIA/TIA-232E and
EIA/TIA-562 receiver input voltage thresholds are the
same, interoperability between EIA/TIA-232E and
EIA/TIA-562 devices is guaranteed. Maxim’s MAX560
and MAX561 are EIA/TIA-562 transceivers that operate
on a single supply from 3.0V to 3.6V, and the MAX562
transceiver operates from 2.7V to 5.25V while produc-
ing EIA/TIA-562 levels.
Figure 5. AutoShutdown with Initial Turn-On to Wake Up a
System
_____________EIA/TIA-562 Standards
MANAGEMENT
POWER
UNIT
MASTER SHDN LINE
FORCEOFF
EIA/TIA-232E and
MAX3218
0.1µF
FORCEON
1M
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