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PDF ICL3238E Data sheet ( Hoja de datos )
| Número de pieza | ICL3238E | |
| Descripción | RS-232 Transceiver | |
| Fabricantes | Intersil | |
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Data Sheet
July 2004
ICL3238E
FN6012.3
±15kV ESD Protected, +3V to +5.5V, 10nA,
250kbps, RS-232 Transceiver with
Enhanced Automatic Powerdown
The Intersil ICL3238E 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. Additionally, it
provides ±15kV ESD protection (IEC61000-4-2 Air Gap and
Human Body Model) on transmitter outputs and receiver
inputs (RS-232 pins). Targeted applications are cell phones,
Palmtops, and data cables where the low operational, and
even lower standby, power consumption is critical. Efficient
on-chip charge pumps, coupled with manual and enhanced
automatic powerdown functions, reduce the standby supply
current to a 10nA 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 providing
compatibility with popular PC communication software.
The ICL3238E is a 5 driver, 3 receiver device optimized for
DCE applications with full hardware handshaking. It also
includes a noninverting always-active receiver for RING
INDICATOR monitoring.
This device, features an enhanced automatic powerdown
function which powers down the on-chip power-supply and
driver circuits. This occurs when all receiver and transmitter
inputs detect no signal transitions for a period of 30s. The
ICL3238E powers back up, automatically, whenever it
senses a transition on any transmitter or receiver input.
The transmitter and logic inputs include active feedback
resistors that retain the input state once driven to a valid
logic level.
Features
• Pb-Free Available as an Option (see Ordering Info)
• ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000)
• Active Feedback Resistors on TX and Logic Inputs.
• Manual and Enhanced Automatic Powerdown Features
• Pin Compatible Replacement for MAX3238E, MAX3238,
SP3238E
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• RS-232 Compatible Outputs at 2.7V Supply
• Flow Through Pinout
• Latch-Up Free
• On-Chip Voltage Converters Require Only Four External
Capacitors
• Receiver and Transmitter 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. . . . . . . . . 10nA
Applications
• Any System Requiring RS-232 Communication Ports
- Battery Powered, Hand-Held, and Portable Equipment
- Data Cradles
- Modems, Printers and other Peripherals
- Cellular/Mobile Phones, Data Cables
Table 1 summarizes the features of the ICL3238E, while
Application Note AN9863 summarizes the features of each
device comprising the ICL32XXE 3V family.
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
ICL3238E
NO. OF NO. OF
Tx. Rx.
53
NO. OF
MONITOR Rx.
(ROUTB)
1
DATA
RATE
(kbps)
250
Rx. ENABLE
FUNCTION?
No
READY
OUTPUT?
No
MANUAL
POWER-
DOWN?
Yes
ENHANCED
AUTOMATIC
POWERDOWN
FUNCTION?
Yes
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, 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ICL3238E
Electrical Specifications TSepsetcCifioendd. iTtiyopnisc:aVlsCaCre=a3t.T15AV=to255o.C5V,(CC1on- tCin4u=ed0).1µF; VCC = 3V, C1 - C4 = 0.22µF; Unless Otherwise
PARAMETER
TEST CONDITIONS
TEMP
(oC)
MIN
TYP
MAX UNITS
ENHANCED AUTOMATIC POWERDOWN (FORCEON = GND, FORCEOFF = VCC)
Receiver Input Thresholds to
INVALID High
(Figure 6)
Full -2.7
-
2.7 V
Receiver Input Thresholds to
INVALID Low
(Figure 6)
Full -0.3
-
0.3 V
INVALID Output Voltage Low
IOUT = 1.0mA
INVALID Output Voltage High
IOUT = -1.0mA
Receiver Positive or Negative
Threshold to INVALID High Delay
(tINVH)
Receiver Positive or Negative
Threshold to INVALID Low Delay
(tINVL)
Receiver or Transmitter Edge to (Note 6)
Transmitters Enabled Delay (tWU)
Receiver or Transmitter Edge to
Transmitters Disabled Delay
(tAUTOPWDN)
(Note 6)
TRANSMITTER OUTPUTS
Full -
Full VCC-0.6
25 -
-
-
0.3
0.4 V
-V
- µs
25 - 60 - µs
25 - 25 - µs
Full 15 30 60 s
Output Voltage Swing
All Transmitter Outputs Loaded with 3kΩ to Ground
Full ±5.0 ±5.4 - V
Output Resistance
Output Short-Circuit Current
VCC = V+ = V- = 0V, Transmitter Output = ±2V
Full 300 10M - Ω
Full -
±35 ±60 mA
Output Leakage Current
VOUT = ±12V, VCC = 0V or 3V to 5.5V,
Automatic Powerdown or FORCEOFF = GND
Full -
- ±25 µA
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation Delay
Receiver Output Enable Time
RL = 3kΩ, CL = 1000pF, One Transmitter Switching
Receiver Input to Receiver
Output, CL = 150pF
tPHL
tPLH
Normal Operation
Full 250
500
25 - 0.15
25 - 0.15
25 - 150
- kbps
- µs
- µs
- ns
Receiver Output Disable Time Normal Operation
25 - 300 - ns
Transmitter Skew
Receiver Skew
Transition Region Slew Rate
tPHL - tPLH
tPHL - tPLH
VCC = 3.3V,
RL = 3kΩ to 7kΩ,
Measured From 3V to -3V or -3V
to 3V
CL = 150pF to 1000pF
CL = 150pF to 2500pF
25
25
25
25
-
-
6
4
50 - ns
50 - ns
15 30 V/µs
12 30 V/µs
ESD PERFORMANCE
RS-232 Pins (TOUT, RIN)
IEC61000-4-2 Air Gap Discharge
IEC61000-4-2 Contact Discharge
25 - ±15 - kV
25 - ±8 - kV
Human Body Model
25 - ±15 - kV
All Other Pins
Human Body Model
25 - ±2.5 - kV
NOTES:
5. These inputs utilize a positive feedback resistor. The input current is negligible when the input is at either supply rail.
6. An “edge” is defined as a transition through the transmitter or receiver input thresholds.
5
5 Page 
ICL3238E
Interconnection with 3V and 5V Logic
The ICL3238E directly interfaces with 5V CMOS and TTL
logic families. Nevertheless, with the ICL32XX at 3.3V, and
the logic supply at 5V, AC, HC, and CD4000 outputs can
drive ICL32XX inputs, but ICL32XX outputs do not reach the
minimum VIH for these logic families. See Table 4 for more
information.
TABLE 4. LOGIC FAMILY COMPATIBILITY WITH VARIOUS
SUPPLY VOLTAGES
SYSTEM
VCC
POWER-SUPPLY SUPPLY
VOLTAGE VOLTAGE
(V) (V)
COMPATIBILITY
3.3 3.3 Compatible with all CMOS
families.
5 5 Compatible with all TTL and
CMOS logic families.
5 3.3 Compatible with ACT and HCT
CMOS, and with TTL. ICL32XX
outputs are incompatible with AC,
HC, and CD4000 CMOS inputs.
±15kV ESD Protection
All pins on ICL32XX devices include ESD protection
structures, but the ICL32XXE family incorporates advanced
structures which allow the RS-232 pins (transmitter outputs
and receiver inputs) to survive ESD events up to ±15kV. The
RS-232 pins are particularly vulnerable to ESD damage
because they typically connect to an exposed port on the
exterior of the finished product. Simply touching the port
pins, or connecting a cable, can cause an ESD event that
might destroy unprotected ICs. These new ESD structures
protect the device whether or not it is powered up, protect
without allowing any latchup mechanism to activate, and
don’t interfere with RS-232 signals as large as ±25V.
Human Body Model (HBM) Testing
As the name implies, this test method emulates the ESD
event delivered to an IC during human handling. The tester
delivers the charge through a 1.5kΩ current limiting resistor,
making the test less severe than the IEC61000 test which
utilizes a 330Ω limiting resistor. The HBM method
determines an ICs ability to withstand the ESD transients
typically present during handling and manufacturing. Due to
the random nature of these events, each pin is tested with
respect to all other pins. The RS-232 pins on “E” family
devices can withstand HBM ESD events to ±15kV.
IEC61000-4-2 Testing
The IEC61000 test method applies to finished equipment,
rather than to an individual IC. Therefore, the pins most likely
to suffer an ESD event are those that are exposed to the
outside world (the RS-232 pins in this case), and the IC is
tested in its typical application configuration (power applied)
rather than testing each pin-to-pin combination. The lower
current limiting resistor coupled with the larger charge
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.
11
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| PDF Descargar | [ Datasheet ICL3238E.PDF ] | |
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