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參數(shù)資料
| 型號(hào)： | SP3243EUER-L/TR |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 24/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS232 INTELLIGENT 32QFN |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 3/5 |
| 規(guī)程： | RS232 |
| 電源電壓： | 3 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 32-QFN 裸露焊盤（5x5） |
| 包裝： | 帶卷 (TR) |
Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7017 www.exar.com
SP3243E_102_060611
9
Receivers
The receivers convert +5.0V EIA/TIA-232
levels to TTL or CMOS logic output levels. Re-
ceivers are High-Z when the AUTO ON-LINE
circuitry is enabled or when in shutdown. The
truth table logic of the SP3243 driver and receiver
outputs can be found in Table 2.
The SP3243E includes an additional non-in-
verting receiver with an output R
2OUT. R2OUT
is an extra output that remains active and
monitors activity while the other receiver
outputs are forced into high impedance.
This allows a Ring Indicator (RI) signal from a
peripheral to be monitored without forward
biasing the TTL/CMOS inputs of the other
devices connected to the receiver outputs.
Table 2. SHUTDOWN Truth Tables
Note: InAUTO ON-LINE Mode where ONLINE = GND
and SHUTDOWN = V
CC, the device will shut down if
there is no activity present at the Receiver inputs.
Figure 11. Loopback Test Circuit for RS-232 Driver
Data Transmission Rates
Since receiver input is usually from a transmis-
sion line where long cable lengths and system
interference can degrade the signal, the inputs
have a typical hysteresis margin of 300mV. This
ensures that the receiver is virtually immune to
noisy transmission lines. Should an input be left
unconnected, an internal 5K pulldown resistor
to ground will commit the output of the receiver
to a HIGH state.
Figure 13. Loopback Test results at 250Kbps
Figure 12. Loopback Test results at 1Mbps
SP3243
GND
T1IN
TXIN
C1+
C1-
C2+
C2-
V+
V-
VCC
0.1 F
+
C2
C5
C1
+
C3
C4
+
0.1 F
TTL/CMOS
INPUTS
+3V to +5V
18
SHUTDOWN
5K
R1OUT
5K
RXIN
RXOUT
TTL/CMOS
OUTPUTS
ONLINE
R1IN
TXOUT
T1OUT
STATUS
VCC
To P Supervisor
Circuit
1000pF
Device: SP3243E
SHUTDOWN
TxOUT
RxOUT
R2OUT
0
High-Z
Active
1
Active
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP3243EUET | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3243EUET/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3243EUET-L | 功能描述:RS-232接口集成電路 High Spd Intel. +3V to +5.5V RS-232 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: |
| SP3243EUET-L/TR | 功能描述:RS-232接口集成電路 High Spd Intel. +3V to +5.5V RS-232 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: |
| SP3243EUEY | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
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