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參數(shù)資料
| 型號： | ISL8563ECB |
| 廠商： | Intersil |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 0K |
| 描述： | XMITTER/RCVR RS562/232 18-SOIC |
| 標(biāo)準(zhǔn)包裝： | 40 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 2/2 |
| 規(guī)程： | RS232，RS562 |
| 電源電壓： | 3 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 18-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 18-SOIC W |
| 包裝： | 管件 |
5
Detailed Description
The ISL8563E operates from a single +3V to +5.5V supply,
guarantees a 250kbps minimum data rate, requires only four
small external 0.1
F capacitors, features low power
consumption, and meets all ElA/TIA-562 and EIA/TIA-232
specifications. The circuit is divided into three sections: The
charge pump, the transmitters, and the receivers.
Charge-Pump
Intersil’s new ISL8563E utilizes regulated on-chip dual
charge pumps as voltage doublers, and voltage inverters to
generate
±5.5V transmitter supplies from a VCC supply as
low as 3.0V. This allows these devices to maintain RS-232
compliant output levels over the
±10% tolerance range of
3.3V powered systems. The efficient on-chip power supplies
require only four small, external 0.1
F capacitors for the
voltage doubler and inverter functions over the full VCC
range. The charge pumps operate discontinuously (i.e., they
turn off as soon as the V+ and V- supplies are pumped up to
the nominal values), resulting in significant power savings.
Transmitters
The transmitters are proprietary, low dropout, inverting
drivers that translate TTL/CMOS inputs to EIA/TIA-562/232
output levels. Coupled with the on-chip
±5.5V supplies,
these transmitters deliver true RS-562/232 levels over a
wide range of single supply system voltages.
All transmitter outputs disable and assume a high
impedance state when the device enters the powerdown
mode (see Table 2). These outputs may be driven to
±12V
when disabled.
All devices guarantee a 250kbps data rate (VOUT = ±5V) for
full load conditions (3k
and 1000pF), VCC ≥ 3.0V, with one
transmitter operating at full speed. Under more typical
conditions of VCC ≥ 3.3V, RL = 3k, and CL = 250pF, one
transmitter easily operates at 900kbps.
Unused transmitter inputs may be left unconnected because
they will be pulled to VCC by the on-chip pull-up resistors.
Forcing the ISL8563E into power down disables the pull-up
resistors to further minimize power.
Receivers
The ISL8563E contains standard inverting receivers that
three-state via the EN control line. All the receivers convert
RS-562/232 signals to CMOS output levels and accept
inputs up to
±25V while presenting the required 3k to 7k
input impedance (see Figure 3) even if the power is off
(VCC = 0V). The receivers’ Schmitt trigger input stage uses
hysteresis (even in powerdown) to increase noise immunity
and decrease errors due to slow input signal transitions.
The ISL8563E inverting receivers disable only when EN is
driven high. Standard receivers driving powered down
peripherals must be disabled to prevent current flow through
the peripheral’s protection diodes (see Figures 4 and 5).
Powerdown Functionality
This 3V device requires a nominal supply current of 0.3mA
during normal operation (not in powerdown mode). This is
considerably less than the 5mA to 11mA current required by
5V devices. The already low current requirement drops
significantly when the device enters powerdown mode. In
powerdown, supply current drops to 1
A, because the on-
chip charge pump turns off (V+ collapses to VCC, V-
collapses to GND), the transmitter outputs three-state, and
the transmitter input pull-ups disable. This micro-power
mode makes the ISL8563E ideal for battery powered and
portable applications.
Software Controlled (Manual) Powerdown
The ISL8563E, is forced into its low power, stand by state via
a simple shutdown (SHDN) pin. Driving this pin high enables
normal operation, while driving it low forces the IC into its
powerdown state. Connect SHDN to VCC if the powerdown
function isn’t needed. Note that all the receiver outputs
remain enabled during shutdown (see Table 2). For the
lowest power consumption during powerdown, the receivers
should also be disabled by driving the EN input high (see
next section, and Figures 4 and 5). The time required to exit
powerdown, and resume transmission is less than 30
s.
Receiver ENABLE Control
The device also features an EN input to control the receiver
outputs. Driving EN high disables all the receiver outputs
placing them 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 4). The
enable input has no effect on transmitters.
RXOUT
GND
≤ VROUT ≤ VCC
5k
RXIN
-25V
≤ VRIN ≤ +25V
GND
VCC
FIGURE 3. INVERTING RECEIVER CONNECTIONS
TABLE 2. POWERDOWN AND ENABLE LOGIC TRUTH TABLE
SHDN INPUT
EN INPUT
TRANSMITTER OUTPUTS
RECEIVER OUTPUTS
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
ISL8563E
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL8563ECB-T | 功能描述:XMITTER/RCVR RS562/232 18-SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:25 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:4.5 V ~ 5.5 V 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:16-PDIP 包裝:管件 |
| ISL8563ECP | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Intersil Corporation 功能描述: |
| ISL8563EIB | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Intersil Corporation 功能描述: |
| ISL8563EIP | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ISL8563IB | 制造商:Rochester Electronics LLC 功能描述:RS562 3V 2D/2R SHUTDOWN 18SOIC IND - Bulk |
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