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參數(shù)資料
| 型號(hào)： | MAX3320_CAP |
| 廠(chǎng)商： | Maxim Integrated Products, Inc. |
| 元件分類(lèi)： | RS-232 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | 5V的高速RS - 232收發(fā)器與0.1uF電容 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 128K |
| 代理商： | MAX3320_CAP |
M
3V to 5.5V, up to 250kbps True RS-232 Transceiver
with 4μA AutoShutdown Plus and Power-On Reset
_______________________________________________________________________________________
9
When using the minimum required capacitor values,
make sure the capacitor value does not degrade
excessively with temperatures outside the 0°C to +70°C
range. If in doubt, use capacitors with a larger nominal
value. The capacitor's equivalent series resistance
(ESR), which usually rises at low temperatures, influ-
ences the amount of ripple on V+ and V-.
T ransmitter Outputs
when Exiting S hutdown
Figure 5 shows two transmitter outputs when exiting
shutdown mode. As they become active, the two trans-
mitter outputs go to opposite RS-232 levels (one trans-
mitter input is high; the other is low). Each transmitter is
loaded with 3k
in parallel with 2500pF. The transmitter
outputs display no ringing or undesirable transients as
they exit shutdown. Note that the transmitters are
enabled only when the magnitude of V- exceeds
approximately 3V.
High Data Rates
The MAX3320 maintains the RS-232 ±5V minimum
transmitter output voltage even at high data rates.
Figure 6 shows a transmitter loop-back test circuit.
Figure 7 shows a loop-back test result at 120kbps, and
Figure 8 shows the same test at 250kbps. For Figure 7,
both transmitters were driven simultaneously at
120kbps into RS-232 loads in parallel with 1000pF. For
Figure 8, a single transmitter was driven at 250kbps,
and both transmitters were loaded with an RS-232
receiver in parallel with 1000pF.
Interc onnec tion with 3V and 5V Logic
The MAX3320 can directly interface with various 5V
logic families, including ACT and HCT CMOS. See
Table 4 for more information on possible combinations
of interconnections.
V
CC
= 3.3V
C1 - C4 = 0.1
μ
F
5
μ
s/div
2V/div
2V/div
T2OUT
T1OUT
FORCEON =
FORCEOFF
Figure 5. Transmitter Outputs when Exiting Shutdown or
Powering Up
MAX3320
5k
R_ IN
R_ OUT
C2-
C2+
C1-
C1+
V-
V+
V
CC
C4
C3*
C1
C2
V
CC
FORCEOFF
T_ OUT
T_ IN
GND
V
CC
*C3 CAN BE RETURNED TO
V
CC
OR GND.
FORCEON
1000pF
Figure 6. Loop-Back Test Circuit
MAX3320
GND
100k
V
CC
V
CC
RESET
Figure 4. Ensuring
RESET
Valid to V
CC
= 0V
0.1
0.47
3 to 5.5
0.047
0.33
4.5 to 5.5
C1
(μF)
0.1
C2, C3, C4, C
BYPASS
(μF)
0.1
V
CC
(V)
3 to 3.6
Table 3. Required Minimum
Capacitance Values
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| MAX3320LCAP | 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: |
| MAX3320LCAP+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: |
| MAX3320LCAP-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: |
| MAX3320LEAP | 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: |
| MAX3320LEAP-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: |
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