參數資料
型號： MAX3243EEUI+
廠商： Maxim Integrated Products
文件頁數： 15/16頁
文件大?。?/td> 0K
描述： IC TXRX RS-232 W/SHTDWN 28TSSOP
產品培訓模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝： 50
類型： 收發(fā)器
驅動器/接收器數： 3/5
規(guī)程： RS232
電源電壓： 3 V ~ 5.5 V
安裝類型： 表面貼裝
封裝/外殼： 28-TSSOP（0.173"，4.40mm 寬）
供應商設備封裝： 28-TSSOP
包裝： 管件
產品目錄頁面： 1406 (CN2011-ZH PDF)
MAX3221/MAX3223/MAX3243
1A Supply-Current, True +3V to +5.5V
RS-232 Transceivers with AutoShutdown
8
_______________________________________________________________________________________
other system to realize that the MAX3221/MAX3223/
MAX3243 is awake. If the other system outputs valid
RS-232 signals within that time, the RS-232 ports on
both systems remain enabled.
When shut down, the device’s charge pumps are turned
off, V+ decays to VCC, V- decays to ground, and the
transmitter outputs are disabled (high impedance). The
time required to exit shutdown is typically 100s (Figure
5b).
Software-Controlled Shutdown
If direct software control is desired, INVALID can be
used to indicate DTR or Ring Indicator signal. Tie
FORCEOFF and FORCEON together to bypass Auto-
Shutdown so the line acts like a SHDN input.
___________Applications Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for
proper operation; either polarized or nonpolarized
capacitors may be used. The charge pump requires
0.1F capacitors for 3.3V operation. For other supply
voltages, refer to Table 3 for required capacitor values.
Do not use values smaller than those listed in Table 3.
Increasing the capacitor values (e.g., by a factor of 2)
reduces ripple on the transmitter outputs and slightly
reduces power consumption. C2, C3, and C4 can be
increased without changing C1’s value.
However, do
not increase C1 without also increasing the values
of C2, C3, and C4 to maintain the proper ratios (C1
to the other capacitors).
When using the minimum required capacitor values,
make sure the capacitor value does not degrade
excessively with temperature. If in doubt, use capaci-
tors with a larger nominal value. The capacitor’s equiva-
lent series resistance (ESR) usually rises at
low temperatures and influences the amount of ripple
on V+ and V-.
Table 2. AutoShutdown Logic
RS-232 SIGNAL
PRESENT AT
RECEIVER INPUT
F
FO
OR
RC
CE
EO
OF
FF
F INPUT
FORCEON
INPUT
IIN
NV
VA
AL
LIID
D OUTPUT
TRANSCEIVER STATUS
Yes
H
X
H
Normal Operation
No
H
L
Normal Operation (Forced On)
No
H
L
Shutdown (AutoShutdown)
Yes
L
X
H
Shutdown (Forced Off)
No
L
X
L
Shutdown (Forced Off)
V-
VCC
0
V+
0
VCC
tINVL
tWU
INVALID
REGION
RECEIVER
INPUT
VOLTAGE
(V)
INVALID
OUTPUT
(V)
tINVH
TRANSMITTERS ENABLED, INVALID HIGH
RECEIVER
INPUT
LEVELS
AUTOSHUTDOWN, TRANSMITTERS DISABLED,
1A SUPPLY CURRENT, INVALID LOW
TRANSMITTERS ENABLED, INVALID HIGH
-2.7V
-0.3V
+2.7V
+0.3V
0V
INDETERMINATE
(b)
(a)
Figure 5. AutoShutdown Trip Levels
相關PDF資料
PDF描述
VE-JTZ-MX-F4 CONVERTER MOD DC/DC 2V 30W
MAX3238EEAI+ IC TXRX RS-232 TRUE 28-SSOP
MAX3237EEAI+ IC TXRX RS232 1MBPS 28-SSOP
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VE-JTZ-MX-F1 CONVERTER MOD DC/DC 2V 30W
相關代理商/技術參數
參數描述
MAX3243EEUI+ 功能描述:RS-232接口集成電路 3-5.5V 250kbps Transceiver RoHS:否 制造商:Exar 數據速率: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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
MAX3243EEUI+T 功能描述:RS-232接口集成電路 3-5.5V 250kbps Transceiver RoHS:否 制造商:Exar 數據速率: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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
MAX3243EEUI-T 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數據速率: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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
MAX3243EEWI 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數據速率: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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
MAX3243EEWI+ 功能描述:RS-232接口集成電路 3-5.5V 250kbps Transceiver RoHS:否 制造商:Exar 數據速率: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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
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