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PDF ISL83220E Data sheet ( Hoja de datos )
| Número de pieza | ISL83220E | |
| Descripción | +/-15kV ESD Protected/ +3V to +5.5V/ 1Microamp/ 250kbps/ RS-232 Transmitters/Receivers | |
| Fabricantes | Intersil Corporation | |
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TM
Data Sheet
ISL83220E
September 2001
File Number 6011.1
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+/-15kV ESD Protected, +3V to +5.5V,
1Microamp, 250kbps, RS-232
Transmitters/Receivers
The Intersil ISL83220E is a 3.0V to 5.5V powered RS-232
transmitter/receiver which meets ElA/TIA-232 and V.28/V.24
specifications, even at VCC = 3.0V. Additionally, it provides
±15kV ESD protection (IEC 1000-4-2 Air Gap and Human
Body Model) on transmitter outputs and receiver inputs
(RS-232 pins). 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. This family is fully
compatible with 3.3V only systems, mixed 3.3V and 5.0V
systems, and 5.0V only systems.
Table 1 summarizes the features of the ISL83320E, while
Application Note AN9863 summarizes the features of each
device comprising the ICL32XXE 3V family.
Features
• ESD Protection for RS-232 I/O Pins to ±15kV (IEC1000)
• Drop in Replacement for SP3220E
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• Interoperable with RS-232 down to VCC = 2.7V
• Latch-Up Free
• On-Chip Voltage Converters Require Only Four External
0.1µF Capacitors
• Manual Powerdown Feature with Receivers Active
• Separate Receiver Enable Pin
• RX and TX Hysteresis For Improved Noise Immunity
• 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)”
PART
NUMBER
ISL83220E
NO. OF NO. OF
Tx. Rx.
11
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
1 page  
ISL83220E
Receivers
The ISL83220E device contains a standard inverting
receiver that three-states via the EN control line. Receivers
convert RS-232 signals to CMOS output levels and accept
inputs up to ±25V while presenting the required 3kΩ to 7kΩ
input impedance (see Figure 1) even if the power is off
(VCC = 0V). The receiver’s Schmitt trigger input stage uses
hysteresis to increase noise immunity and decrease errors
due to slow input signal transitions.
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 Figures 2). This renders them
useless for wake up functions.
VCC
R1IN
-25V ≤ VRIN ≤ +25V
GND
5kΩ
R1OUT
GND ≤ VROUT ≤ VCC
FIGURE 1. INVERTING RECEIVER CONNECTIONS
Operation down to 2.7V
ISL83220E transmitter outputs meet RS-562 levels (±3.7V)
with VCC as low as 2.7V. RS-562 levels typically ensure inter
operability 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 1µA, 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 100µs.
TABLE 2. POWERDOWN AND ENABLE LOGIC TRUTH TABLE
SHDN EN TRANSMITTER RECEIVER MODE OF
INPUT INPUT OUTPUT
OUTPUT OPERATION
LL
High-Z
Active Manual
Powerdown
LH
High-Z
High-Z
Manual
Powerdown
w/Rcvr. Disabled
HL
Active
Active Normal
Operation
HH
Active
High-Z
Normal
Operation
w/Rcvr. Disabled
VCC
VCC
VCC
CURRENT
FLOW
VOUT = VCC
POWERED
DOWN
UART
Rx
GND
Tx
SHDN = GND
OLD
RS-232 CHIP
FIGURE 2. POWER DRAIN THROUGH POWERED DOWN
PERIPHERAL
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 0.1µF 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-.
5
5 Page 
ISL83220E
Small Outline Plastic Packages (SOIC)
N
INDEX
AREA
E
-B-
H
0.25(0.010) M B M
123
-A-
D
SEATING PLANE
A
L
h x 45o
-C-
e A1
B
0.25(0.010) M C A M B S
µα
0.10(0.004)
C
NOTES:
1. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of
Publication Number 95.
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
3. Dimension “D” does not include mold flash, protrusions or gate burrs.
Mold flash, protrusion and gate burrs shall not exceed 0.15mm (0.006
inch) per side.
4. Dimension “E” does not include interlead flash or protrusions. Interlead
flash and protrusions shall not exceed 0.25mm (0.010 inch) per side.
5. The chamfer on the body is optional. If it is not present, a visual index
feature must be located within the crosshatched area.
6. “L” is the length of terminal for soldering to a substrate.
7. “N” is the number of terminal positions.
8. Terminal numbers are shown for reference only.
9. The lead width “B”, as measured 0.36mm (0.014 inch) or greater above
the seating plane, shall not exceed a maximum value of 0.61mm (0.024
inch)
10. Controlling dimension: MILLIMETER. Converted inch dimensions are
not necessarily exact.
M16.3 (JEDEC MS-013-AA ISSUE C)
16 LEAD WIDE BODY SMALL OUTLINE PLASTIC PACKAGE
INCHES
MILLIMETERS
SYMBOL MIN MAX MIN MAX NOTES
A
0.0926 0.1043 2.35
2.65
-
A1
0.0040 0.0118 0.10
0.30
-
B
0.013 0.0200 0.33
0.51
9
C
0.0091 0.0125 0.23
0.32
-
D 0.3977 0.4133 10.10 10.50
3
E
0.2914 0.2992 7.40
7.60
4
e 0.050 BSC
1.27 BSC
-
H 0.394 0.419 10.00 10.65
-
h
0.010 0.029
0.25
0.75
5
L
0.016 0.050
0.40
1.27
6
N 16
16 7
α 0o 8o 0o 8o -
Rev. 0 12/93
All Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice.
Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable.
However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its
use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
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Intersil Corporation
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11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet ISL83220E.PDF ] | |
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