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參數(shù)資料
| 型號： | MAX3245CAI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | LINE TRANSCEIVER|CMOS|3 DRIVER|5 RCVR|SSOP|28PIN|PLASTIC |
| 中文描述： | TRIPLE LINE TRANSCEIVER, PDSO28 |
| 封裝： | SSOP-28 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 235K |
| 代理商： | MAX3245CAI |
_______________Detailed Desc ription
Dual Charge-Pump V oltage Converter
The MAX3224–MAX3227/MAX3244/MAX3245’s internal
power supply consists of a regulated dual charge
pump that provides output voltages of +5.5V (doubling
charge pump) and -5.5V (inverting charge pump), over
the +3.0V to +5.5V range. The charge pump operates
in discontinuous mode: if the output voltages are less
than 5.5V, the charge pump is enabled; if the output
voltages exceed 5.5V, the charge-pump is disabled.
Each charge pump requires a flying capacitor (C1, C2)
and a reservoir capacitor (C3, C4) to generate the V+
and V- supplies.
The READY output (MAX3224–MAX3227) is low when
the charge pumps are disabled in shutdown mode. The
READY signal asserts high when V- goes below -4V.
RS -232 T ransmitters
The transmitters are inverting level translators that
convert CMOS-logic levels to 5.0V EIA/TIA-232 levels.
The MAX3224/MAX3226/MAX3244 guarantee a
250kbps data rate (1Mbps for the MAX3225/MAX3227/
MAX3245) with worst-case loads of 3k
in parallel with
1000pF, providing compatibility with PC-to-PC com-
munication software (such as LapLink). Transmitters
can be paralleled to drive multiple receivers. Figure 1
shows a complete system connection.
M
1μA S upply Current, 1Mbps, 3.0V to 5.5V,
RS -232 Transc eivers with AutoS hutdown Plus
_______________________________________________________________________________________
7
PIN
NAME
MAX3224
MAX3225
MAX3226
MAX3227
MAX3244
MAX3245
1
1
—
READY
2
2
28
C1+
Positive Terminal of Voltage-Doubler Charge-Pump Capacitor
3
3
27
V+
+5.5V generated by the charge pump
4
4
24
C1-
Negative Terminal of Voltage-Doubler Charge-Pump Capacitor
5
5
1
C2+
Positive Terminal of Inverting Charge-Pump Capacitor
6
6
2
C2-
Negative Terminal of Inverting Charge-Pump Capacitor
7
7
3
V-
-5.5V generated by the charge pump
8, 17
13
9–11
T_OUT
RS-232 Transmitter Outputs
9, 16
8
4–8
R_IN
RS-232 Receiver Inputs
10, 15
9
15–19
R_OUT
TTL/CMOS Receiver Outputs
11
10
21
INVALID
Valid Signal Detector Output, active low. A logic high indicates that a valid
RS-232 level is present on a receiver input.
12, 13
11
12–14
T_IN
TTL/CMOS Transmitter Inputs
14
12
23
FORCEON
Force-On Input, active high. Drive high to override AutoShutdown Plus,
keeping transmitters and receivers on (
FORCEOFF
must be high) (Table 1).
18
14
25
GND
Ground
19
15
26
V
CC
+3.0V to +5.5V Single Supply Voltage
20
16
22
FORCEOFF
Force-Off Input, active low. Drive low to shut down transmitters, receivers
(except R2OUTB), and charge pump. This overrides AutoShutdown Plus
and FORCEON (Table 1).
—
—
20
R2OUTB
TTL/CMOS Noninverting Complementary Receiver Outputs. Always active.
Ready to Transmit Output, active high. READY is enabled high when
V- goes below -4V and the device is ready to transmit.
FUNCTION
Pin Desc ription
LapLink is a trademark of Traveling Software.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3245CAI+ | 功能描述:RS-232接口集成電路 3-5.5V 1Mbps 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: |
| MAX3245CAI+ | 制造商:Maxim Integrated Products 功能描述:SEMICONDUCTOR ((NW)) |
| MAX3245CAI+T | 功能描述:RS-232接口集成電路 3-5.5V 1Mbps 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: |
| MAX3245CAI-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: |
| MAX3245CWI | 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: |
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