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參數(shù)資料
| 型號： | MAX218 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 16-Bit Buffers/Drivers With 3-State Outputs 48-SSOP -40 to 85 |
| 中文描述： | 1.8V至4.25V供電、雙路、真RS-232收發(fā)器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 92K |
| 代理商： | MAX218 |
M
1.8V to 4.25V-Powered,
True RS -232 Dual Transc eiver
6
_______________________________________________________________________________________
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
in parallel with 1000pF at up to 120kbps. Connect
CC
. Disable the
unused driver inputs to either GND or V
forced into a high-impedance state when S———Nis low.
RS -232 Rec eivers
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
into a high-impedance state. This allows two RS-232
ports (or two ports of different types) to be wired-ORed
at the UART.
S———Nand EN determine the MAX218’s mode of opera-
tion, as shown in Table 2.
Table 2. Operating Modes
When S———Nis low, the power supplies are disabled and
the transmitters are put into a high-impedance state.
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
.
__________Applic ations Information
Operation from Regulated/Unregulated
Dual S ystem Power S upplies
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 0.1μF at V
CC
(C4) and at
least 1μF at the inductor (C5). Increase C5 to 4.7μF 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
J apan (075) 951-9111
USA (404) 436-3030
J apan (075) 955-6526
Sumida
CD43150
USA (708) 956-0666
J apan (03) 3607-5111
USA (708) 956-0702
J apan (03) 3607-5428
TDK
NLC453232T-150K
USA (708) 803-6100
J apan (03) 3278-5111
USA (708) 803-6296
J apan (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
–—H—D—NENOUTPUT
DRIVER
OUTPUT
DC-DC
CONVERTER
L
L
High-Z
High-Z
OFF
L
H
Enabled
High-Z
OFF
H
L
High-Z
Enabled
ON
H
H
Enabled
Enabled
ON
SUPPLY
CURRENT
Minimum
Minimum
Normal
Normal
Inductors—Surface Mount
Diodes—Surface Mount
Diodes—Through-Hole
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX218CAP | 16-Bit Buffers/Drivers With 3-State Outputs 48-SSOP -40 to 85 |
| MAX218CPP | Replaced by SN74ABT16245A : 16-Bit Bus Transceivers With 3-State Outputs 48-TSSOP -40 to 85 |
| MAX218CWP | Replaced by SN74ABT16245A : 16-Bit Bus Transceivers With 3-State Outputs 48-SSOP -40 to 85 |
| MAX218EAP | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| MAX218EPP | 16-Bit Bus Transceivers With 3-State Outputs 48-TSSOP -40 to 85 |
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