- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385535 > MAX562 (Maxim Integrated Products, Inc.) Complete 230kbps, 2.7V to 5.25V Serial Interface for Notebook Computers(2.7~5.25V,230kbps,高速RS-232串行口) PDF資料下載
參數(shù)資料
| 型號： | MAX562 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Complete 230kbps, 2.7V to 5.25V Serial Interface for Notebook Computers(2.7~5.25V,230kbps,高速RS-232串行口) |
| 中文描述： | 完備的、230kbps、2.7V至5.25V串行接口，用于筆記本電腦 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 96K |
| 代理商： | MAX562 |
M
Complete 230kbps, 2.7V to 5.25V
S erial Interfac e for Notebook Computers
6
_______________________________________________________________________________________
_______________Detailed Desc ription
The MAX562 has three sections: the charge-pump voltage
converter, the drivers (transmitters), and the receivers.
Charge-Pump V oltage Converter
The charge-pump voltage converter is used to produce a
positive and a negative supply to drive the transmitters. The
positive voltage (V+) is generated by a regulated charge
pump working as either a doubler or a tripler (depending on
the V
level) and using capacitors C1A, C1B and C3 (see
Typical Operating Circuit. The negative voltage (V-) derives
from V+ using a simple charge-pump inverter that employs
capacitors C2 and C4.
These charge-pump converters are regulated to give output
voltages of +5.8V and -5.2V. Having regulated supplies
generated on-chip makes the MAX562's performance insen-
sitive to variations in V
from 2.7V to 5.25V, transmitter load-
ing changes, and operating temperature changes.
When
SHDN
is low, the charge pumps are disabled, V+ is
internally connected to V
CC
, and V- is internally connected to
GND.
EIA/T IA-562 Drivers
The driver output voltage is guaranteed to meet the ±3.7V
EIA/TIA-562 specification over the full range of operating
temperatures and voltages, when each transmitter is
loaded with up to 3k
and operated up to 230kbps (see
Typical Operating Characteristics). The typical driver out-
put voltage swing exceeds ±4V with a 3k
load on all
transmitter outputs. The open-circuit output voltage swing
is typically from (V+ - 0.7V) to (V- + 0.7V). Output swing is
not significantly dependent on V
CC
since the charge
pumps are regulated.
Input thresholds are CMOS and TTL compatible. Connect
unused inputs to V
CC
or to GND.
When
SHDN
is low, the driver outputs are off and their leak-
age currents are less than 10μA, even if the transmitter
outputs are back-driven between -7V and +15V. Taking
SHDN
low does not disable the receivers.
When
SHDN
and EN are both low, the entire chip is
disabled and all outputs are high impedance. Power
consumption is lowest in this condition. Exiting shutdown
takes about 100μs, but depends on V
CC
. Figure 5 shows
SHDN
V
OH
V
OL
+3V
0V
OUTPUT DISABLE TIME (t
DT
)
+3V
-3V
0V
A. TIMING DIAGRAM
1 OR 0
T
X
3k
50pF
B. TEST CIRCUIT
TRANSMITTER
OUTPUTS
Figure 3. Transmitter-Output Disable Timing
EN
V
OH
-1V,
V
OL
+1.6V
R_
IN
R_
OUT
1k
150pF
A. TEST CIRCUIT
B. ENABLE TIMING
EN INPUT
RECEIVER
OUTPUTS
+3V
0V
OUTPUT ENABLE TIME (t
ER
)
V
OH
V
OL
EN
RECEIVER
OUTPUTS
EN
+3V
0V
OUTPUT DISABLE TIME (t
DR
)
V
OH
-0.5V
V
OL
+0.5V
EN INPUT
V
OH
V
OL
C. DISABLE TIMING
R_
Figure 4. Receiver-Output Enable and Disable Timing
相關PDF資料 |
PDF描述 |
|---|---|
| MAX563 | +3.3V-Powered, EIA/TIA-562 Dual Transceiver with Receivers Active in Shutdown(3.3V,雙組EIA/TIA-562接收器) |
| MAX5742AUB | 12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface |
| MAX5742 | Dual Very-High Speed, High-Current Peripheral Drivers 8-CDIP -55 to 125 |
| MAX5742EUB | 12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface |
| MAX5812PEUT | 12-Bit Low-Power, 2-Wire, Serial Voltage-Output DAC |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5621AETK | 制造商:Maxim Integrated Products 功能描述:16-BIT DACS WITH 16-CHANNEL SAMPLE-AND-HOLD O - Rail/Tube |
| MAX5621UCB+ | 制造商:Maxim Integrated Products 功能描述:16-BIT DACS WITH 16-CHANNEL SAMPLE-AND-HOLD OUTPUTS - Rail/Tube |
| MAX5621UCB+D | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5621UTK | 制造商:Maxim Integrated Products 功能描述:16-BIT DACS WITH 16-CHANNEL SAMPLE-AND-HOLD O - Rail/Tube |
| MAX5621UTK+ | 制造商:Maxim Integrated Products 功能描述:16-BIT DACS WITH 16-CHANNEL SAMPLE- - Rail/Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復。