参数资料
| 型号： | ISL83220EIV-T |
| 厂商： | Intersil |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC 1DRVR/1RCVR RS232 16-TSSOP |
| 标准包装： | 2,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
6
The ISL83220E receiver disables only when EN is driven
high. (see Table 2). This allows the receiver to monitor
external devices, like a modem, even when the ISL83220E
is in its 1μA powerdown state.
Standard receivers driving powered down peripherals must
be disabled to prevent current flow through the peripheral’s
protection diodes (see Figure 2). This renders them useless
for wake up functions.
Operation Down to 2.7V
ISL83220E transmitter outputs meet RS-562 levels (±3.7V),
at the full data rate, with VCC as low as 2.7V. RS-562 levels
typically ensure interoperability with RS-232 devices.
Powerdown Functionality
This 3V family of RS-232 interface devices requires a
nominal supply current of 0.3mA during normal operation
(not in powerdown mode), which is considerably less than
the 5mA to 11mA current required of 5V RS-232 devices.
The already low current requirement drops significantly
when the device enters powerdown mode. In powerdown,
supply current drops to 1
μA, because the on-chip charge
pump turns off (V+ collapses to VCC, V- collapses to GND),
and the transmitter outputs three-state. This micro-power
mode makes these devices ideal for battery powered and
portable applications.
Software Controlled (Manual) Powerdown
On the ISL83220E, the powerdown control is via a simple
shutdown (SHDN) pin. Driving this pin high enables normal
operation, while driving it low forces the IC into it’s
powerdown state. Connect SHDN to VCC if the powerdown
function isn’t needed. Note that the receiver output remains
enabled during shutdown (see Table 2). For the lowest
power consumption during powerdown, the receiver should
also be disabled by driving the EN input high (see next
section). The time to recover from manual powerdown mode
is typically 100
μs.
Receiver ENABLE Control
The ISL83220E also features an EN input to control the
receiver output. Driving EN high disables the receiver output
placing it in a high impedance state. This is useful to
eliminate supply current, due to a receiver output forward
biasing the protection diode, when driving the input of a
powered down (VCC = GND) peripheral (see Figure 2).
Capacitor Selection
The charge pumps require 0.1
μF capacitors for 3.3V
operation. Do not use values smaller than 0.1μF. Increasing
the capacitor values (by a factor of 2) reduces ripple on the
transmitter outputs and slightly reduces power consumption.
When using minimum required capacitor values, make sure
that capacitor values do not degrade excessively with
temperature. If in doubt, use capacitors with a larger nominal
value. The capacitor’s equivalent series resistance (ESR)
usually rises at low temperatures and it influences the
amount of ripple on V+ and V
-.
Power Supply Decoupling
In most circumstances a 0.1
μF bypass capacitor is
adequate. In applications that are particularly sensitive to
power supply noise, decouple VCC to ground with a
capacitor of the same value as the charge-pump capacitor C1.
Connect the bypass capacitor as close as possible to the IC.
R1OUT
GND
≤ VROUT ≤ VCC
5k
Ω
R1IN
-25V
≤ VRIN ≤ +25V
GND
VCC
FIGURE 1. INVERTING RECEIVER CONNECTIONS
TABLE 2. POWERDOWN AND ENABLE LOGIC TRUTH TABLE
SHDN
INPUT
EN
INPUT
TRANSMITTER
OUTPUT
RECEIVER
OUTPUT
MODE OF
OPERATION
L
High-Z
Active
Manual Powerdown
L
H
High-Z
Manual Powerdown
w/Rcvr. Disabled
H
L
Active
Normal Operation
H
Active
High-Z
Normal Operation
w/Rcvr. Disabled
FIGURE 2. POWER DRAIN THROUGH POWERED DOWN
PERIPHERAL
OLD
VCC
POWERED
GND
SHDN = GND
VCC
Rx
Tx
VCC
CURRENT
VOUT = VCC
FLOW
RS-232 CHIP
DOWN
UART
ISL83220E
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相关代理商/技术参数 |
参数描述 |
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| ISL83220EIVZ | 功能描述:RS-232接口集成电路 RS232 3V 1D/1R 15KV SHTDWN IND 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: |
| ISL83220EIVZ-T | 功能描述:RS-232接口集成电路 RS232 3V 1D/1R 15KV SHTDWN IND 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: |
| ISL8323 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Low-Voltage, Single Supply, Dual SPST Analog Switches |
| ISL8323_04 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Low-Voltage, Single Supply, Dual SPST Analog Switches |
| ISL83239E | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:【15kV ESD Protected, 10nA Supply- Current, +3V to +5.5V, 250kbps, RS-232 Transmitters/Receivers |
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