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ISL4221E_07 Datasheet, PDF (5/13 Pages) Intersil Corporation – QFN Packaged, ±15kV ESD Protected, +2.7V to +5.5V, 150nA, 250kBps, RS-232 Transmitters/Receivers
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ISL4221E, ISL4223E
Electrical Specifications
PARAMETER
Test Conditions: VCC = 3V to 5.5V, C1 through C4 = 0.1μF; Unless Otherwise Specified.
Typicals are at TA = +25°C (Continued)
TEST CONDITIONS
TEMP
(°C)
MIN
TYP
Receiver Positive or Negative
Threshold to INVALID Low Delay
(tINVL)
RECEIVER INPUTS
25
-
30
Input Voltage Range
25
-25
-
Input Threshold Low
Input Threshold High
Input Hysteresis
VCC = 3.3V
VCC = 5.0V
VCC = 3.3V
VCC = 5.0V
25
0.6
1.2
25
0.8
1.5
25
-
1.5
25
-
1.8
25
-
0.5
Input Resistance
25
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,
Automatic Powerdown or FORCEOFF = GND
Full
-
-
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
25
-
25
-
25
-
500
0.15
0.15
200
Receiver Output Disable Time Normal Operation
25
-
200
Transmitter Skew
tPHL - tPLH (Note 2)
25
-
100
Receiver Skew
tPHL - tPLH
25
-
50
Transition Region Slew Rate
VCC = 3.3V, RL = 3kΩ to 7kΩ, CL = 150pF to 2500pF 25
4
-
Measured From 3V to -3V
or -3V to 3V
CL = 150pF to 1000pF 25
6
-
ESD PERFORMANCE
RS-232 Pins (TOUT, RIN)
Human Body Model
IEC61000-4-2 Contact Discharge
25
-
±15
25
-
±8
IEC61000-4-2 Air Gap Discharge
25
-
±15
All Other Pins
Human Body Model
25
-
±2
NOTE:
2. Transmitter skew is measured at the transmitter zero crossing points.
MAX UNITS
-
μs
25
V
-
V
-
V
2.4
V
2.4
V
-
V
7
kΩ
-
V
-
Ω
±60
mA
±25
μA
-
kBps
-
μs
-
μs
-
ns
-
ns
-
ns
-
ns
30
V/μs
30
V/μs
-
kV
-
kV
-
kV
-
kV
Detailed Description
The ISL422XE operate from a single +2.7V to +5.5V supply,
guarantee a 250kBps minimum data rate, require only four
small external 0.1μF capacitors, feature low power
consumption, and meet all ElA RS-232C and V.28
specifications even with VCC = 3.0V. The circuit is divided into
three sections: The charge pump, the transmitters, and the
receivers.
Charge-Pump
Intersil’s new ISL422XE devices utilize 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 them 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
5
FN6045.2
April 13, 2007
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