參數(shù)資料
型號(hào)： MAX218CAP
廠(chǎng)商： Maxim Integrated Products
文件頁(yè)數(shù)： 6/8頁(yè)
文件大?。?/td> 0K
描述： IC TXRX DUAL RS232 TRUE 20-SSOP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 66
類(lèi)型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 2/2
規(guī)程： RS232
電源電壓： 1.8 V ~ 4.25 V
安裝類(lèi)型： 表面貼裝
封裝/外殼： 20-SSOP（0.209"，5.30mm 寬）
供應(yīng)商設(shè)備封裝： 20-SSOP
包裝： 管件
MAX218
1.8V to 4.25V-Powered,
True RS-232 Dual Transceiver
6
_______________________________________________________________________________________
RS-232 Drivers
The two drivers are identical, and deliver EIA/TIA-232E
and EIA/TIA-562 output voltage levels when VDD is
between 1.8V and 4.25V. The transmitters drive up to
3k
in parallel with 1000pF at up to 120kbps. Connect
unused driver inputs to either GND or VCC. Disable the
drivers by taking S
—
H
—
D
—
N
–
low. The transmitter outputs are
forced into a high-impedance state when S
—
H
—
D
—
N
–
is low.
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, the receivers are active regardless of the state of
S
—
H
—
D
—
N
–
. 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.
Operating Modes
S
—
H
—
D
—
N
–
and EN determine the MAX218’s mode of opera-
tion, as shown in Table 2.
Table 2. Operating Modes
Shutdown
When S
—
H
—
D
—
N
–
is low, the power supplies are disabled and
the transmitters are put into a high-impedance state.
Receiver operation is not affected by taking S
—
H
—
D
—
N
–
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 VCC.
__________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—an
ideal configuration where a regulated 3V supply is
being derived from two cells. In this application, the
MAX218’s 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 0.1F at VCC (C4) and at
least 1F at the inductor (C5). Increase C5 to 4.7F if
the power supply has no other bypass capacitor con-
nected to it.
MANUFACTURER
PART NUMBER
PHONE
FAX
Murata-Erie
LQH4N150K-TA
USA (404) 436-1300
Japan (075) 951-9111
USA (404) 436-3030
Japan (075) 955-6526
Sumida
CD43150
USA (708) 956-0666
Japan (03) 3607-5111
USA (708) 956-0702
Japan (03) 3607-5428
TDK
NLC453232T-150K
USA (708) 803-6100
Japan (03) 3278-5111
USA (708) 803-6296
Japan (03) 3278-5358
Central Semiconductor
CMPSH-3, Schottky
USA (516) 435-1110
USA (516) 435-1824
Motorola
MMBD6050LT1, Silicon
USA (408) 749-0510
USA (408) 991-7420
Philips
PMBD6050, Silicon
USA (401) 762-3800
USA (401) 767-4493
Motorola
1N6050, Silicon
1N5817, Schottky
USA (408) 749-0510
USA (408) 991-7420
Table 1. Suggested Component Suppliers
–
S
—
H
—
D
—
N
–
EN
RECEIVER
OUTPUT
DRIVER
OUTPUT
DC-DC
CONVERTER
L
High-Z
OFF
L
H
Enabled
High-Z
OFF
H
L
High-Z
Enabled
ON
H
Enabled
ON
SUPPLY
CURRENT
Minimum
Normal
Inductors—Surface Mount
Diodes—Surface Mount
Diodes—Through-Hole
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX218CAP+ 功能描述:RS-232接口集成電路 1.8-4.25V True RS232 Dual Transceiver RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
MAX218CAP+T 功能描述:RS-232接口集成電路 1.8-4.25V True RS232 Dual Transceiver RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
MAX218CAP-T 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
MAX218CPP 功能描述:RS-232接口集成電路 1.8-4.25V True RS232 Dual Transceiver RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
MAX218CPP+ 功能描述:RS-232接口集成電路 1.8-4.25V True RS232 Dual Transceiver RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
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