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參數(shù)資料
| 型號(hào)： | MAX562CAI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | Complete 230kbps, 2.7V to 5.25V Serial Interface for Notebook Computers |
| 中文描述： | LINE TRANSCEIVER, PDSO28 |
| 封裝： | SSOP-28 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 80K |
| 代理商： | MAX562CAI |
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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX562CAI+ | 功能描述:RS-232接口集成電路 230kbps 2.7-5.25V Serial Interface 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: |
| MAX562CAI+T | 功能描述:RS-232接口集成電路 230kbps 2.7-5.25V Serial Interface 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: |
| MAX562CAI-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: |
| MAX562CWI | 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: |
| MAX562CWI+ | 功能描述:RS-232接口集成電路 230kbps 2.7-5.25V Serial Interface 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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