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參數(shù)資料
| 型號(hào)： | MAX3311E-MAX3313E |
| 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(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 110K |
| 代理商： | MAX3311E-MAX3313E |
Detailed Desc ription
S ingle Charge-Pump V oltage Converter
The MAX3311E/MAX3313E internal power supply has a
single inverting charge pump that provides a negative
voltage from a single +5V supply. The charge pump
operates in a discontinuous mode and requires a flying
capacitor (C1) and a reservoir capacitor (C2) to gener-
ate the V- supply.
RS -232-Compatible Driver
The transmitter is an inverting level translator that con-
verts CMOS-logic levels to EIA/TIA-232 compatible lev-
els. It guarantees data rates up to 460kbps with
worst-case loads of 3k
in parallel with 1000pF. When
SHDN
is driven low, the transmitter is disabled and put
into tri-state. The transmitter input does not have an
internal pullup resistor.
RS -232 Rec eiver
The MAX3311E/MAX3313E receiver converts RS-232
signals to CMOS-logic output levels. The MAX3311E
receiver will remain active during shutdown mode. The
MAX3313E
INVALID
indicates when an RS-232 signal
is present at the receiver input, and therefore when the
port is in use.
The MAX3313E
INVALID
output is pulled low when no
valid RS-232 signal level is detected on the receiver
input.
MAX 3311E S hutdown Mode
In shutdown mode, the charge pump is turned off, V- is
pulled to ground, and the transmitter output is disabled
(Table 1). This reduces supply current typically to 1μA.
The time required to exit shutdown is less than 25ms.
Applic ations Information
Capac itor S elec tion
The capacitor type used for C1 and C2 is not critical for
proper operation; either polarized or nonpolarized
capacitors are acceptable. If polarized capacitors are
used, connect polarity as shown in the
Typical
Operating Circuit
. The charge pump requires 0.1μF
capacitors. Increasing the capacitor values (e.g., by a
factor of 2) reduces power consumption. C2 can be
increased without changing C1
’
s value. However, do
not increase C1
’
s value without also increasing the
value of C2 and C
BYPASS
to maintain the proper ratios
(C1 to the other capacitors).
When using the minimum 0.1μF capacitors, make sure
the capacitance does not degrade excessively with
temperature. If in doubt, use capacitors with a larger
nominal value. The capacitor
’
s equivalent series resis-
tance (ESR) usually rises at low temperatures and influ-
ences the amount of ripple on V-.
To reduce the output impedance at V-, use larger
capacitors (up to 10μF).
Bypass V
CC
to ground with at least 0.1μF. In applica-
tions sensitive to power-supply noise generated by the
charge pump, decouple V
CC
to ground with a capaci-
tor the same size as (or larger than) charge-pump
capacitors C1 and C2.
T ransmitter Output when Exiting
S hutdown
Figure 1 shows the transmitter output when exiting
shutdown mode. The transmitter is loaded with 3k
in
parallel with 1000pF. The transmitter output displays no
ringing or undesirable transients as the MAX3311E
comes out of shutdown. Note that the transmitter is
enabled only when the magnitude of V- exceeds
approximately -3V.
High Data Rates
The MAX3311E/MAX3313E maintain RS-232-compati-
ble ±3.7V minimum transmitter output voltage even at
M
±15kV ES D-Protec ted, 460kbps, 1μA,
RS -232-Compatible Transc eivers in μMAX
_______________________________________________________________________________________
5
Table 1. MAX3311E Shutdown Logic
Truth Table
SHDN
TRANSMITTER
OUTPUT
High Z
RECEIVER
OUTPUT
Active
CHARGE
PUMP
Inactive
L
H
Active
Active
Active
Figure 1. Transmitter Output when Exiting Shutdown or
Powering Up
10
μ
s/div
SHDN
TOUT
5V/div
0
1.5V/div
0
TIN = GND
TIN = V
CC
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參數(shù)描述 |
|---|---|
| MAX3311EUB | 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: |
| MAX3311EUB+ | 功能描述:RS-232接口集成電路 460kbps 1uA 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: |
| MAX3311EUB+T | 功能描述:RS-232接口集成電路 460kbps 1uA 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: |
| MAX3311EUB-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: |
| MAX3313CUB | 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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