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參數(shù)資料
| 型號(hào)： | SP3222EEY-L/TR |
| 廠商： | Exar Corporation |
| 文件頁(yè)數(shù)： | 22/23頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS232 ESD TRUE 20TSSOP |
| 產(chǎn)品變化通告： | Packaging Change 15/Jul/2010 |
| 標(biāo)準(zhǔn)包裝： | 1,500 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 2/2 |
| 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： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-TSSOP |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | SP3222EEY-L/TR-ND |
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7017 www.exar.com
SP3222E/SP3232E_101_031413
The
SP3222E/SP3232E transceivers
meet the EIA/TIA-232 and ITU-T V.28/V.24
communication protocols and can be imple-
mented in battery-powered, portable, or
hand-held applications such as notebook or
palmtopcomputers.The
SP3222E/SP3232E
devices feature
Exar's proprietary on-board
charge pump circuitry that generates ±5.5V
for RS-232 voltage levels from a single
+3.0V to +5.5V power supply. This series is
ideal for +3.3V-only systems, mixed +3.3V
to +5.5V systems, or +5.0V-only systems
that require true RS-232 performance. The
SP3222E/SP3232E devices can operate
at a typical data rate of 235kbps when fully
loaded.
The
SP3222E and SP3232E are 2-driver/2-
receiver devices ideal for portable or hand-
held applications. The
SP3222E features a
1A shutdown mode that reduces power
consumption and extends battery life in por-
table systems. Its receivers remain active in
shutdown mode, allowing external devices
such as modems to be monitored using only
1A supply current.
THEORY OF OPERATION
The
SP3222E/SP3232E series is made up
of three basic circuit blocks:
1. Drivers
2. Receivers
3. The Exar proprietary charge pump
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 with-
out degradation in reliability. Driver outputs
will meet EIA/TIA-562 levels of +/-3.7V with
supply voltages as low as 2.7V.
The drivers can guarantee a data rate of
120kbps fully loaded with 3k in parallel
with 1000pF, ensuring compatability with
PC-to-PC communication software.
The slew rate of the driver is internally limited
to a maximum of 30V/s in order to meet the
EIA standards (EIA RS-232D 2.1.7, Para-
graph 5). The transition of the loaded output
fromHIGHtoLOWalsomeetthemonotonic-
ity requirements of the standard.
Figure 8 shows a loopback test circuit
used to test the RS-232 Drivers. Figure
9 shows the test results of the loopback
circuit with all drivers active at 120kbps
with RS-232 loads in parallel with a
1000pF capacitor. Figure 10 shows the
test results where one driver was active
at 235kbps and all drivers loaded with an
RS-232 receiver in parallel with 1000pF
capacitors. A solid RS-232 data transmis-
sion rate of 120kbps provides compatibility
with many designs in personal computer
peripherals and LAN applications.
The
SP3222E driver's output stages are
turned off (tri-state) when the device is in
shutdown mode. When the power is off, the
SP3222E device permits the outputs to be
driven up to +/-12V. The driver's inputs do
not have pull-up resistors. Designers should
connect unused inputs to Vcc or GND.
In the shutdown mode, the supply current
falls to less than 1A, where SHDN = LOW.
When the
SP3222E device is shut down,
the device's driver outputs are disabled (tri-
stated) and the charge pumps are turned off
with V+ pulled down to Vcc and V- pulled to
GND. The time required to exit shutdown is
typically 100s. Connect SHDN to Vcc if the
shutdown mode is not used.
DESCRIPTION
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