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PDF ISL8563 Data sheet ( Hoja de datos )
| Número de pieza | ISL8563 | |
| Descripción | +3V to +5.5V/ 1Microamp/ 250kbps/ EIA/TIA-562/ EIA/TIA-232 Transmitters/Receivers | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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TM
Data Sheet
ISL8563
March 2001
File Number 6005
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+3V to +5.5V, 1Microamp, 250kbps,
EIA/TIA-562, EIA/TIA-232
Transmitters/Receivers
The Intersil ISL8563 contains 3.0V to 5.5V powered
transmitters/receivers which meet ElA/TIA-562 and
ElA/TIA-232 specifications, even at VCC = 3.0V. Targeted
applications are PDAs, Palmtops, and notebook and laptop
computers where the low operational, and even lower
standby, power consumption is critical. Efficient on-chip
charge pumps, coupled with a manual powerdown function,
reduce the standby supply current to a 1µA trickle. Small
footprint packaging, and the use of small, low value
capacitors ensure board space savings as well. Data rates
greater than 250kbps are guaranteed at worst case load
conditions. The ISL8563 is fully compatible with 3.3V only
systems, mixed 3.3V and 5.0V systems, and 5.0V only
systems.
This product features an improved charge pump which
delivers ±5V transmitter supplies, allowing the use of the
ISL8563 in RS-562 and RS-232 applications. RS-562
applications will benefit from the improved noise immunity
afforded by the ±5V output swing capability.
Table 1 summarizes the features of the device represented
by this data sheet, while Application Note AN9863
summarizes the features of each device comprising the 3V
RS-232 family.
For a drop-in compatible part with ±15kV ESD protection,
please see the ISL8563E data sheet.
Ordering Information
PART NO.
ISL8563CB
ISL8563CB-T
ISL8563CP
ISL8563IB
ISL8563IB-T
TEMP.
RANGE (oC)
PACKAGE
0 to 70 18 Ld SOIC
0 to 70 Tape and Reel
0 to 70 18 Ld PDIP
-40 to 85 18 Ld SOIC
-40 to 85 Tape and Reel
PKG. NO.
M18.3
M18.3
E18.3
M18.3
M18.3
Features
• Drop in Replacement for MAX563, with Improved Output
Voltage (±5V) for Enhanced Noise Immunity
• Available as ±15kV ESD Protected Version (ISL8563E)
• Meets EIA/TIA-562, and EIA/TIA-232 Specifications at 3V
• Latch-Up Free
• On-Chip Voltage Converters Require Only Four External
0.1µF Capacitors
• Receivers Active in Powerdown
• Receiver Hysteresis For Improved Noise Immunity
• Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps
• Guaranteed Minimum Slew Rate . . . . . . . . . . . . . . . 4V/µs
• Wide Power Supply Range. . . . . . . . Single +3V to +5.5V
• Low Supply Current in Powerdown State . . . . . . . . . . . 1µA
Applications
• Any System Requiring RS-562/RS-232 Communication
Ports
- Battery Powered, Hand-Held, and Portable Equipment
- Laptop Computers, Notebooks, Palmtops
- Digital Cameras
- Bar Code Readers
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• Application Note AN9863, “3V to +5.5V, 250K-1Mbps,
RS-232 Transmitters/Receivers”
Pinout
ISL8563 (PDIP, SOIC)
TOP VIEW
EN 1
C1+ 2
V+ 3
C1- 4
C2+ 5
C2- 6
V- 7
T2OUT 8
R2IN 9
18 SHDN
17 VCC
16 GND
15 T1OUT
14 R1IN
13 R1OUT
12 T1IN
11 T2IN
10 R2OUT
PART
NUMBER
ISL8563
NO. OF NO. OF
Tx. Rx.
22
TABLE 1. SUMMARY OF FEATURES
NO. OF
MONITOR Rx.
(ROUTB)
0
DATA
RATE
(kbps)
250
Rx. ENABLE
FUNCTION?
YES
READY
OUTPUT?
NO
MANUAL
POWER-
DOWN?
YES
AUTOMATIC
POWERDOWN
FUNCTION?
NO
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil and Design is a trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2001, All Rights Reserved
1 page  
ISL8563
Detailed Description
The ISL8563 operates from a single +3V to +5.5V supply,
guarantees a 250kbps minimum data rate, requires only four
small external 0.1µF 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 ISL8563 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 0.1µF 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 (3kΩ and 1000pF), VCC ≥ 3.0V, with one
transmitter operating at full speed. Under more typical
conditions of VCC ≥ 3.3V, RL = 3kΩ, 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 ISL8563 into power down disables the pull-up
resistors to further minimize power.
Receivers
The ISL8563 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 3kΩ to 7kΩ
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 ISL8563 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).
VCC
RXIN
-25V ≤ VRIN ≤ +25V
5kΩ
RXOUT
GND ≤ VROUT ≤ VCC
GND
FIGURE 3. INVERTING RECEIVER CONNECTIONS
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 1µA, 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 ISL8563 ideal for battery powered and
portable applications.
Software Controlled (Manual) Powerdown
The ISL8563, 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 30µs.
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.
SHDN INPUT
L
L
H
H
EN INPUT
L
H
L
H
TABLE 2. POWERDOWN AND ENABLE LOGIC TRUTH TABLE
TRANSMITTER OUTPUTS
RECEIVER OUTPUTS
MODE OF OPERATION
High-Z
Active
Manual Powerdown
High-Z
High-Z
Manual Powerdown w/Rcvr. Disabled
Active
Active
Normal Operation
Active
High-Z
Normal Operation w/Rcvr. Disabled
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ISL8563.PDF ] | |
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