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PDF ISL83384E Data sheet ( Hoja de datos )
| Número de pieza | ISL83384E | |
| Descripción | 15kV ESD Protected/ +3V to +5.5V/ 1 Microamp/ 250Kbps/ RS-232 Transmitter/Receiver | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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®
Data Sheet
April 2003
ISL83384E
FN6017.1
±15kV ESD Protected, +3V to +5.5V,
1 Microamp, 250Kbps, RS-232
Transmitter/Receiver
The Intersil ISL83384E contains 3.0V to 5.5V powered
RS-232 transmitters/receivers which meet ElA/TIA-232 and
V.28/V.24 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
reduces 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. This device is fully compatible with 3.3V only
systems, mixed 3.3V and 5.0V systems, and 5.0V only
systems.
The single pin powerdown function (SHDN = 0) disables all
the transmitters and receivers, while shutting down the
charge pump to minimize supply current drain.
Table 1 summarizes the features of the ISL83384E, while
Application Note AN9863 summarizes the features of each
device comprising the ICL32XX 3V family.
Ordering Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
ISL83384ECB
0 to 70 18 Ld SOIC
ISL83384ECB-T 0 to 70 Tape and Reel
ISL83384ECA
0 to 70 20 Ld SSOP
ISL83384ECA-T 0 to 70 Tape and Reel
ISL83384EIA
-40 to 85 20 Ld SSOP
ISL83384EIA-T -40 to 85 Tape and Reel
PKG. NO.
M18.3
M18.3
M20.209
M20.209
M20.209
M20.209
Features
• ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000)
• Drop In Replacement for MAX3384E, SP385E
• Low Power, Pin Compatible Upgrade for 5V MAX222,
SP310E, ADM222, and LT1780
• Single SHDN Pin Disables Transmitters and Receivers
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• RS-232 Compatible with VCC = 2.7V
• Latch-Up Free
• On-Chip Voltage Converters Require Only Four External
0.1µF Capacitors
• Receiver Hysteresis For Improved Noise Immunity
• Very Low Supply Current . . . . . . . . . . . . . . . . . . . . 0.3mA
• Guaranteed Minimum Data Rate . . . . . . . . . . . . 250Kbps
• Guaranteed Minimum Slew Rate . . . . . . . . . . . . . . . 6V/µs
• Wide Power Supply Range . . . . . . . Single +3V to +5.5V
• Low Supply Current in Powerdown State. . . . . . . . . < 1µA
Applications
• Any System Requiring RS-232 Communication Ports
- Battery Powered, Hand-Held, and Portable Equipment
- Laptop Computers, Notebooks, Palmtops
- Modems, Printers and other Peripherals
- Digital Cameras
- Cellular/Mobile Phones
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• AN9863, “3V to +5.5V, 250k-1Mbps, RS-232
Transmitters/Receivers”
PART
NUMBER
ISL83384E
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?
NO
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 registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL83384E
All the receivers convert RS-232 signals to CMOS output
levels and accept inputs up to ±30V while presenting the
required 3kΩ to 7kΩ input impedance (see Figure 1) even if
the power is off (VCC = 0V). The receivers’ Schmitt trigger
input stage uses hysteresis to increase noise immunity and
decrease errors due to slow input signal transitions.
VCC
RXIN
-25V ≤ VRIN ≤ +25V
5kΩ
RXOUT
GND ≤ VROUT ≤ VCC
GND
FIGURE 1. INVERTING RECEIVER CONNECTIONS
VCC
VCC
VCC
CURRENT
FLOW
VOUT = VCC
POWERED
DOWN
UART
Rx
GND
Tx
SHDN = GND
OLD
RS-232 CHIP
Low Power Operation
This 3V device requires a nominal supply current of 0.3mA,
even at VCC = 5.5V, during normal operation (not in
powerdown mode). This is considerably less than the 11mA
current required by comparable 5V RS-232 devices,
allowing users to reduce system power simply by replacing
the old style device with the ISL83384E.
Low Power, Pin Compatible Replacement
Pin compatibility with existing 5V products (e.g., MAX222),
coupled with the wide operating supply range, make the
ISL83384E a potential lower power, higher performance
drop-in replacement for existing 5V applications. As long as
the ±5V RS-232 output swings are acceptable, and
transmitter pull-up resistors aren’t required, the ISL83384E
should work in most 5V applications.
When replacing a device in an existing 5V application, it is
acceptable to terminate C3 to VCC as shown on the “Typical
Operating Circuit”. Nevertheless, terminate C3 to GND if
possible, as slightly better performance results from this
configuration.
Powerdown Functionality
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),
and the transmitter and receiver outputs three-state. This
micro-power mode makes these devices ideal for battery
powered and portable applications.
Software Controlled (Manual) Powerdown
The ISL83384E may be forced into its low power, standby
state via a simple shutdown (SHDN) pin (see Figure 4).
Driving this pin high enables normal operation, while driving
it low forces the IC into it’s powerdown state. The time
required to exit powerdown, and resume transmission is less
than 50µs. Connect SHDN to VCC if the powerdown function
isn’t needed.
FIGURE 2. POWER DRAIN THROUGH POWERED DOWN
PERIPHERAL
VCC
TRANSITION
DETECTOR
TO
WAKE-UP
LOGIC
VCC
ISL83384E
V-
RX
POWERED
DOWN
UART
TX
VOUT = HI-Z
FIGURE 3. DISABLED RECEIVERS PREVENT POWER DRAIN
PWR
MGT
LOGIC
SHDN
ISL83384E
CPU
I/O
UART
FIGURE 4. CONNECTIONS FOR MANUAL POWERDOWN
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ISL83384E.PDF ] | |
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