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| 型号： | SP3243EUCT-L |
| 厂商： | Exar Corporation |
| 文件页数： | 23/24页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 INTELLIGNT 28WSOIC |
| 标准包装： | 27 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 3/5 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 管件 |
8
Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7017 www.exar.com
SP3243E_102_060611
DESCRIPTION
The SP3243E transceivers meet the EIA/TIA-
232andITU-TV.28/V.24communicationprotocols
and can be implemented in battery-powered,
portable, or hand-held applications such as
notebook or palmtop computers. The SP3243E
devices feature Exar's proprietary and patented
(U.S.-- 5,306,954) on-board charge pump cir-
cuitrythatgenerates±5.5VRS-232voltagelevels
from a single +3.0V to +5.5V power supply. The
SP3243EU devices can operate at a data rate
of 1000kbps fully loaded.
The SP3243E is a 3-driver/5-receiver device,
ideal for portable or hand-held applications.
The SP3243E includes one complementary
always-active receiver that can monitor an
external device (such as a modem) in shutdown.
This aids in protecting the UART or serial
controller IC by preventing forward biasing
of the protection diodes where V
CC may be
disconnected.
The SP3243E series is an ideal choice for power
sensitive designs.The SP3243E devices feature
AUTO ON-LINE circuitry which reduces the
power supply drain to a 1A supply current.
In many portable or hand-held applications, an
RS-232cablecanbedisconnectedoraconnected
peripheral can be turned off. Under these condi-
tions,theinternalchargepumpandthedriverswill
be shut down. Otherwise, the system automati-
cally comes online. This feature allows design
engineers to address power saving concerns
without major design changes.
THEORY OF OPERATION
The SP3243E series is made up of four basic
circuit blocks:
1. Drivers
2. Receivers
3. the Exar proprietary charge pump, and
4. AUTO ON-LINE circuitry.
Drivers
The drivers are inverting level transmitters that
convert TTL or CMOS logic levels to 5.0V EIA/
TIA-232 levels with an inverted sense relative
to the input logic levels. Typically, the RS-232
output voltage swing is +5.4V with no load and
+5V minimum fully loaded. The driver outputs are
protected against infinite short-circuits to ground
without degradation in reliability. These drivers
comply with the EIA-TIA-232-F and all previous
RS-232 versions. Unused drivers inputs should
be connected to GND or V
CC.
The drivers have a minimum data rate of 250kbps
(EB) or 1000kbps (EU) fully loaded.
Figure 11 shows a loopback test circuit used to
test the RS-232 Drivers. Figure 12 shows the
test results where one driver was active at 1Mbps
and all three drivers loaded with an RS-232 re-
ceiver in parallel with a 250pF capacitor. Figure
13 shows the test results of the loopback circuit
with all drivers active at 250kbps with typical
RS-232loadsinparallelwith1000pFcapacitors.A
superior RS-232 data transmission rate of 1Mbps
makes the SP3243EU an ideal match for high
speed LAN and personal computer peripheral
applications.
Figure 10. Interface Circuitry Controlled by Micropro-
cessor Supervisory Circuit
SP3243E
28
24
2
1
27
3
26
5K
GND
C1+
C1-
C2+
C2-
V+
V-
VCC
14
13
12
20
19
18
17
16
15
0.1 F
+
C2
C5
C1
+
C3
C4
+
0.1 F
9
10
11
4
5
6
7
8
RS-232
OUTPUTS
RS-232
INPUTS
23
22
21
VCC
25
T1IN
R1OUT
R
1 IN
T2 OUT
R2OUT
T2IN
T3IN
T3 OUT
T1OUT
R2IN
R3IN
R4IN
R5IN
R2OUT
R3OUT
R4OUT
R5OUT
ONLINE
SHUTDOWN
STATUS
UART
or
Serial C
P
Supervisor
IC
TxD
RTS
DTR
RxD
CTS
DSR
DCD
RI
VCC
VIN
RESET
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP3243EUCT-L/TR | 功能描述:RS-232接口集成电路 High Spd Intel. +3V to +5.5V RS-232 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| SP3243EUCY | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3243EUCY/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3243EUCY-L | 功能描述:RS-232接口集成电路 High Spd Intel. +3V to +5.5V RS-232 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| SP3243EUCY-L/TR | 功能描述:RS-232接口集成电路 High Spd Intel. +3V to +5.5V RS-232 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
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