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MAX218CPP+ Datasheet

  • MAX218CPP+

  • RS-232 Transceiver IC; Device Type:Line Driver/Receiver; No....

  • 8頁

  • Maxim   Maxim

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1.8V to 4.25V-Powered,
True RS-232 Dual Transceiver
MAX218
Table 1. Suggested Component Suppliers
MANUFACTURER
Inductors鈥擲urface Mount
Murata-Erie
Sumida
TDK
Diodes鈥擲urface Mount
Central Semiconductor
Motorola
Philips
Diodes鈥擳hrough-Hole
Motorola
1N6050, Silicon
1N5817, Schottky
USA (408) 749-0510
USA (408) 991-7420
CMPSH-3, Schottky
MMBD6050LT1, Silicon
PMBD6050, Silicon
USA (516) 435-1110
USA (408) 749-0510
USA (401) 762-3800
USA (516) 435-1824
USA (408) 991-7420
USA (401) 767-4493
LQH4N150K-TA
CD43150
NLC453232T-150K
USA (404) 436-1300
Japan (075) 951-9111
USA (708) 956-0666
Japan (03) 3607-5111
USA (708) 803-6100
Japan (03) 3278-5111
USA (404) 436-3030
Japan (075) 955-6526
USA (708) 956-0702
Japan (03) 3607-5428
USA (708) 803-6296
Japan (03) 3278-5358
PART NUMBER
PHONE
FAX
RS-232 Drivers
The two drivers are identical, and deliver EIA/TIA-232E
and EIA/TIA-562 output voltage levels when V
DD
is
between 1.8V and 4.25V. The transmitters drive up to
3k鈩?in parallel with 1000pF at up to 120kbps. Connect
unused driver inputs to either GND or V
CC
. Disable the
鈥?鈥?/div>
鈥?鈥?/div>
drivers by taking SHDN low. The transmitter outputs are
鈥?鈥?/div>
鈥?鈥?/div>
forced into a high-impedance state when SHDN is low.
Shutdown
鈥?鈥?/div>
鈥?鈥?/div>
When SHDN is low, the power supplies are disabled and
the transmitters are put into a high-impedance 鈥?/div>
鈥?鈥?/div>
鈥?state.
Receiver operation is not affected by taking SHDN low.
Power consumption is dramatically reduced in shutdown
mode. Supply current is minimized when the receiver
inputs are static in any of three states: floating (ground),
GND, or V
CC
.
RS-232 Receivers
The two receivers are identical, and accept both
EIA/TIA-232E and EIA/TIA-562 input signals. The
CMOS receiver outputs swing rail-to-rail. When EN is
high, 鈥?/div>
鈥?鈥攖he receivers are active regardless of the state of
鈥?/div>
SHDN. When EN is low, the receiver outputs are put
into a high-impedance state. This allows two RS-232
ports (or two ports of different types) to be wired-ORed
at the UART.
鈥?鈥?/div>
鈥?鈥?/div>
SHDN and EN determine the MAX218鈥檚 mode of opera-
tion, as shown in Table 2.
__________Applications Information
Operation from Regulated/Unregulated
Dual System Power Supplies
The MAX218 is intended for use with three different
power-supply sources: it can be powered directly from
a battery, from a 3.0V or 3.3V power supply, or simulta-
neously from both. Figure 1 shows the single-supply
configuration. Figure 2 shows the circuit for operation
from both a 3V supply and a raw battery supply鈥攁n
ideal configuration where a regulated 3V supply is
being derived from two cells. In this application, the
MAX218鈥檚 logic levels remain appropriate for interface
with 3V logic, yet most of the power for the MAX218 is
drawn directly from the battery, without suffering the
efficiency losses of the DC-DC converter. This pro-
longs battery life.
Bypass the input supplies with 0.1碌F at V
CC
(C4) and at
least 1碌F at the inductor (C5). Increase C5 to 4.7碌F if
the power supply has no other bypass capacitor con-
nected to it.
Operating Modes
Table 2. Operating Modes
鈥撯€?鈥?/div>
鈥?鈥?/div>
RECEIVER DRIVER
DC-DC
SUPPLY
SHDN EN
OUTPUT OUTPUT CONVERTER CURRENT
L
L
H
H
6
L
H
L
H
High-Z
Enabled
High-Z
Enabled
High-Z
High-Z
Enabled
Enabled
OFF
OFF
ON
ON
Minimum
Minimum
Normal
Normal
_______________________________________________________________________________________

MAX218CPP+ 產品屬性

  • Lead (SnPb) Finish for COTSObsolescence Mitigation Program

  • 18

  • 集成電路 (IC)

  • 接口 - 驅動器，接收器，收發(fā)器

  • -

  • 收發(fā)器

  • 2/2

  • RS232

  • 1.8 V ~ 4.25 V

  • 通孔

  • 20-DIP（0.300"，7.62mm）

  • 20-PDIP

  • 管件

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