ISL4221E Datasheet, PDF (5/13 Pages) Intersil Corporation – QFN Packaged, +/-15kV ESD Protected, +2.7V to +5.5V, 150Nanoamp, 250kBps, RS-232 Transmitters/Receivers

ISL4221E, ISL4223E
Electrical Specifications
TTyepsitcCalosnadrietioantsT:_A^V=CC25=^o3CV
to 5.5V, C₁ -
(Continued)
C₄
=
0.1µF;
Unless
Otherwise
Specified.
PARAMETER
TEST CONDITIONS
TEMP
(^oC)
MIN
TYP
RECEIVER INPUTS
Input Voltage Range
25
-25
-
Input Threshold Low
Input Threshold High
Input Hysteresis
V_CC = 3.3V
V_CC = 5.0V
V_CC = 3.3V
V_CC = 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
V_CC = V+ = V- = 0V, Transmitter Output = ±2V
Full
300
10M
Full
-
±35
Output Leakage Current
V_OUT = ±12V, V_CC = 0V or 3V to 5.5V,
Automatic Powerdown or FORCEOFF = GND
Full
-
-
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation Delay
Receiver Output Enable Time
R_L = 3kΩ, C_L = 1000pF, One Transmitter Switching
Receiver Input to Receiver
Output, C_L = 150pF
t_PHL
t_PLH
Normal Operation
Full
250
500
25
-
0.15
25
-
0.15
25
-
200
Receiver Output Disable Time Normal Operation
25
-
200
Transmitter Skew
t_PHL - t_PLH (Note 2)
25
-
100
Receiver Skew
t_PHL - t_PLH
25
-
50
Transition Region Slew Rate
V_CC = 3.3V, R_L = 3kΩ to 7kΩ, C_L = 150pF to 2500pF
25
4
-
Measured From 3V to -3V
or -3V to 3V
C_L = 150pF to 1000pF 25
6
-
ESD PERFORMANCE
RS-232 Pins (T_OUT, R_IN)
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
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 V_CC = 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 V_CC
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
voltage doubler and inverter functions. The charge pumps
operate discontinuously (i.e., they turn off as soon as the V+
5