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參數(shù)資料
| 型號： | MAX3320_EAP |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 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 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 128K |
| 代理商： | MAX3320_EAP |
3V to 5.5V, up to 250kbps True RS-232 Transceiver
with 4μA AutoShutdown Plus and Power-On Reset
_______________________________________________________________________________________
7
reducing supply current to 4μA. This occurs if the RS-232
cable is disconnected or the connected peripheral trans-
mitters turn off. The system turns on again when a valid
transition occurs at any RS-232 receiver or transmitter
input. As a result, the system saves power without
changes to the existing BIOS or operating system. The
INVALID
output is high when the receivers are active.
Since
INVALID
indicates the receiver inputs’ condition, it
can be used in any mode (Figure 2).
Tables 1 and 2 and Figure 2 summarize the MAX3320’
s
operating modes. FORCEON and
FORCEOFF
override
the automatic circuitry and force the transceiver into its
normal operating state or into its low-power standby
state. When neither control is asserted, the IC enters
AutoShutdown Plus mode and selects between these
states automatically, based on the last receiver or
transmitter input edge received.
When shut down, the device’s charge pumps turn off,
V+ decays to V
CC
, V- decays to ground, and the trans-
mitter outputs turn off (high impedance). The time
required to exit shutdown is typically 25μs (Figure 3a).
S oftware-Controlled S hutdown
If direct software control is desired, use
INVALID
to indi-
cate DTR or Ring Indicator signal. Connect
FORCEOFF
and FORCEON together to bypass the AutoShutdown
Plus feature so the line acts like a
SHDN
input.
Power-On Reset
In addition to issuing a reset to the microprocessor (μP)
during power-up, power-down, and brownout condi-
tions, the MAX3320 is relatively immune to short-
duration, negative-going V
CC
transitions (glitches).
Typically, a V
CC
transient that goes 100mV below the
reset threshold and lasts 20μs or less does not cause a
reset pulse (see Typical Operating Characteristics).
Additional bypass capacitance mounted as close as
possible to the V
CC
pin provides additional transient
immunity.
Table 2.
INVALID
Truth Table
M
+0.3V
-0.3V
INVALID
R_IN
INVALID ASSERTED IF BOTH RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR
AT LEAST
90
μ
s.
90μs
TIMER
R
Figure 2a. INVALID Functional Diagram,
INVALID
Low
+2.7V
-2.7V
R_IN
INVALID DEASSERTED IF EITHER RECEIVER INPUT HAS BEEN BETWEEN +2.7V
AND -2.7V FOR
LESS THAN
90
μ
s.
INVALID
90μs
TIMER
R
Figure 2b.
INVALID
Functional Diagram,
INVALID
High
AUTOSHDN
R_IN
T_IN
R
S
30sec
TIMER
EDGE
DETECT
EDGE
DETECT
FORCEOFF
FORCEON
Figure 2c. AutoShutdown Plus Logic
POWERDOWN*
AUTOSHDN
FORCEOFF
FORCEON
* POWERDOWN IS ONLY AN INTERNAL SIGNAL.
IT CONTROLS THE OPERATIONAL STATUS OF
THE TRANSMITTERS AND THE POWER SUPPLIES.
Figure 2d. Power-Down Logic
Yes
No
RS-232 SIGNAL PRESENT AT
RECEIVER INPUT
L
H
INVALID
OUTPUT
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
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