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PDF ISL4243E Data sheet ( Hoja de datos )
| Número de pieza | ISL4243E | |
| Descripción | QFN Packaged/ +/-15kV ESD Protected/ +2.7V to +5.5V/ 10Nanoamp/ 250kbps/ RS-232 Transmitters/Receivers | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Data Sheet
ISL4241E, ISL4243E
April 2003
FN8037.3
QFN Packaged, +/-15kV ESD Protected,
+2.7V to +5.5V, 10Nanoamp, 250kbps,
RS-232 Transmitters/Receivers
The Intersil ISL424XE devices are 2.7V to 5.5V powered
RS-232 transmitters/receivers which meet ElA/TIA-232 and
V.28/V.24 specifications, even at VCC = 3.0V. Additionally,
they provide ±15kV ESD protection (IEC61000-4-2 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 manual and automatic powerdown functions,
reduce the standby supply current to a 10nA trickle. Tiny
5mm x 5mm Quad Flat No-Lead (QFN) 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 ISL424XE are 3 driver, 5 receiver devices that, coupled
with the 5x5 QFN package, provide the industry’s smallest,
lowest power complete serial port suitable for PDAs, and
laptop or notebook computers. The 5x5 QFN requires 60%
less board area than a 28 lead TSSOP, and is nearly 20%
thinner. The devices also include a noninverting always-
active receiver for “wake-up” capability.
The ISL4243E features an automatic powerdown function
that powers down the on-chip power-supply and driver
circuits. This occurs when an attached peripheral device is
shut off or the RS-232 cable is removed, conserving system
power automatically without changes to the hardware or
operating system. It powers up again when a valid RS-232
voltage is applied to any receiver input.
Table 1 summarizes the features of the ISL424XE, while
Application Note AN9863 summarizes the features of each
device comprising the 3V RS-232 family.
Features
• Parameters Fully Specified for 10% Tolerance Supplies
and Full Industrial Temp Range
• Available in Small QFN (5mm x 5mm) Package which is
60% Smaller than a 28 Lead TSSOP
• ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000)
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• RS-232 Compatible with VCC = 2.7V
• On-Chip Voltage Converters Require Only Four External
0.1µF Capacitors
• Manual and Automatic Powerdown Features
• Receiver Hysteresis For Improved Noise Immunity
• Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps
• Wide Power Supply Range . . . . . . Single +2.7V to +5.5V
• Low Supply Current in Powerdown State. . . . . . . . . .10nA
Applications
• Any Space Constrained System Requiring RS-232 Ports
- Battery Powered, Hand-Held, and Portable Equipment
- Laptop Computers, Notebooks
- PDAs and Palmtops, Data Cables
- Cellular/Mobile Phones, Digital Cameras, GPS
Receivers
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
• ”Technical Brief TB379 “Thermal Characterization of
Packages for ICs”
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
PART
NUMBER
ISL4241E
ISL4243E
TABLE 1. SUMMARY OF FEATURES
NO. OF
Tx.
3
NO. OF
Rx.
5
QFN PKG.
AVAILABLE?
YES
NO. OF
MONITOR Rx.
(ROUTB)
2
DATA
RATE
(kbps)
250
Rx. ENABLE
FUNCTION?
YES
35
YES
1 250 NO
READY
OUTPUT?
NO
NO
MANUAL
POWER-
DOWN?
YES
YES
AUTOMATIC
POWERDOWN
FUNCTION?
NO
YES
Ordering Information
PART NO. TEMP. RANGE (oC) PACKAGE
ISL4241EIR
-40 to 85
32 Ld QFN
ISL4241EIR-T
-40 to 85
Tape & Reel
ISL4243EIR
-40 to 85
32 Ld QFN
ISL4243EIR-T
-40 to 85
Tape & Reel
PKG. NO.
L32.5x5
L32.5x5
L32.5x5
L32.5x5
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  
ISL4241E, ISL4243E
Electrical Specifications TTeypsticCaolsnadriteioantsT: AVC=C25=o3CV(Ctoo5n.t5iVnu, Ced1)- C4 = 0.1µF; Unless Otherwise Specified.
PARAMETER
TEST CONDITIONS
TEMP
(oC)
MIN
TYP
Receiver Positive or Negative
Threshold to INVALID Low Delay
(tINVL)
RECEIVER INPUTS
25 -
Full -
30
40
Input Voltage Range
Full -25
-
Input Threshold Low
Input Threshold High
Input Hysteresis
VCC = 3.0V
VCC = 3.6V
Full -
Full 2.4
25 -
1.0
1.5
0.5
Input Resistance
Full 3
5
TRANSMITTER OUTPUTS
Output Voltage Swing
All Transmitter Outputs Loaded with 3kΩ to Ground
Full ±5.0 ±5.4
Output Resistance
Output Short-Circuit Current
VCC = V+ = V- = 0V, Transmitter Output = ±2V
Full 300 10M
Full -
±35
Output Leakage Current
VOUT = ±12V, VCC = 0V or 3V to 5.5V,
Full -
Automatic Powerdown or FORCEOFF = SHDN = GND
-
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation Delay
RL = 3kΩ, CL = 1000pF, One Transmitter Switching
Receiver Input to Receiver Output,
CL = 150pF
tPHL
Full 250
500
25 - 0.15
Full -
0.2
tPLH
25 -
0.3
Full - 0.35
Receiver Skew
tPHL - tPLH, CL = 150pF
25 -
Full -
120
150
Transmitter Propagation Delay
Transmitter Input to Transmitter Output,
CL = 1000pF, RL = 3kΩ
tPHL
25 - 0.75
Full - 0.85
tPLH
25 -
Full -
0.8
0.9
Transmitter Skew
tPHL - tPLH (Note 2), RL = 3kΩ, CL = 1000pF
25 -
Full -
50
100
Receiver Output Enable Time
Normal Operation, RL = 1kΩ to 0.5VCC, CL = 15pF
25 -
Full -
200
200
Receiver Output Disable Time
Normal Operation, RL = 1kΩ to 0.5VCC, CL = 15pF
25 -
Full -
350
400
Transmitter Output Enable Time Normal Operation, RL = 3kΩ, CL = 1000pF
25 -
Full -
25
30
Transmitter Output Disable Time Normal Operation, RL = 3kΩ, CL = 1000pF
25 -
Full -
2.5
2.7
Transition Region Slew Rate
VCC = 3V to 3.6V, RL = 3kΩ to 7kΩ,
Measured From 3V to -3V or -3V to 3V
CL = 150pF to
2500pF
25
Full
4
4
9
8
CL = 150pF to
1000pF
25
Full
6
6
11
10
MAX
50
60
UNITS
µs
µs
25 V
0.6 V
-V
-V
7 kΩ
-V
-Ω
±60 mA
±25 µA
- kbps
0.3 µs
0.35 µs
0.5 µs
0.55 µs
250 ns
300 ns
1 µs
1.1 µs
1 µs
1.1 µs
200 ns
250 ns
350 ns
400 ns
500 ns
600 ns
40 µs
50 µs
4 µs
4 µs
30 V/µs
30 V/µs
30 V/µs
30 V/µs
5
5 Page 
ISL4241E, ISL4243E
storage capacitor yields a test that is much more severe than
the HBM test. The extra ESD protection built into this
device’s RS-232 pins allows the design of equipment
meeting level 4 criteria without the need for additional board
level protection on the RS-232 port.
AIR-GAP DISCHARGE TEST METHOD
For this test method, a charged probe tip moves toward the
IC pin until the voltage arcs to it. The current waveform
delivered to the IC pin depends on approach speed,
humidity, temperature, etc., so it is difficult to obtain
repeatable results. The “E” device RS-232 pins withstand
±15kV air-gap discharges.
CONTACT DISCHARGE TEST METHOD
During the contact discharge test, the probe contacts the
tested pin before the probe tip is energized, thereby
eliminating the variables associated with the air-gap
discharge. The result is a more repeatable and predictable
test, but equipment limits prevent testing devices at voltages
higher than ±8kV. All “E” family devices survive ±8kV contact
discharges on the RS-232 pins.
Typical Performance Curves VCC = 3.3V, TA = 25oC
6
VOUT+
4
2
1 TRANSMITTER AT 250kbps
OTHER TRANSMITTERS AT 30kbps
0
-2
-4 VOUT -
-6
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
FIGURE 12. TRANSMITTER OUTPUT VOLTAGE vs LOAD
CAPACITANCE
45
40
250kbps
35
30
120kbps
25
20
20kbps
15
10
0
1000
2000
3000
4000
LOAD CAPACITANCE (pF)
5000
FIGURE 14. SUPPLY CURRENT vs LOAD CAPACITANCE
WHEN TRANSMITTING DATA
Die Characteristics
SUBSTRATE POTENTIAL (POWERED UP):
GND
TRANSISTOR COUNT:
ISL424XE: 464
11
25
20
15
-SLEW
+SLEW
10
5
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
FIGURE 13. SLEW RATE vs LOAD CAPACITANCE
3.5
NO LOAD
ALL OUTPUTS STATIC
3.0
2.5
2.0
1.5
1.0
0.5
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
FIGURE 15. SUPPLY CURRENT vs SUPPLY VOLTAGE
PROCESS:
Si Gate CMOS
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ISL4243E.PDF ] | |
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