CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
1.
θ
JA
is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
Test Conditions: V
CC
= 3V to 5.5V, C
1
- C
4
= 0.1
μ
F; Unless Otherwise Specified.
Typicals are at T
A
= 25°C
TEST CONDITIONS
TEMP
(°C)
MIN
TYP
MAX
UNITS
PARAMETER
DC CHARACTERISTICS
Supply Current
Supply Current, Powerdown
All Outputs Unloaded,
SHDN = V
CC
SHDN = GND
V
CC
= 3.15V
25
25
-
-
0.3
1.0
1.0
10
mA
μA
LOGIC AND TRANSMITTER INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold Low
Input Logic Threshold High
T
IN
, EN, SHDN
T
IN
, EN, SHDN
V
CC
= 3.3V
V
CC
= 5.0V
Transmitter Input Hysteresis
Input Leakage Current
Output Leakage Current
Output Voltage Low
Output Voltage High
TRANSMITTER OUTPUTS
Output Voltage Swing
Output Resistance
Output Short-Circuit Current
Output Leakage Current
RECEIVER INPUTS
Input Voltage Range
Input Threshold Low
V
CC
= 3.3V
V
CC
= 5.0V
Input Threshold High
V
CC
= 3.3V
V
CC
= 5.0V
Input Hysteresis
Input Resistance
Full
Full
Full
Full
Full
25
Full
-25
0.6
0.8
-
-
-
3
-
1.2
1.5
1.5
1.8
0.3
5
25
-
-
2.4
2.4
-
7
V
V
V
V
V
V
kΩ
All Transmitter Outputs Loaded with 3kΩ to Ground
V
CC
= V+ = V- = 0V, Transmitter Output =
±2V
V
OUT
= 0V
V
OUT
=
±12V,
V
CC
= 0V or 3V to 5.5V, SHDN = GND
Full
Full
Full
Full
±5.0
300
-
-
±5.4
10M
±35
-
-
-
±60
±25
V
Ω
mA
μA
T
IN
, EN, SHDN
EN = V
CC
I
OUT
= 1.6mA
I
OUT
= -1.0mA
Full
Full
Full
25
Full
Full
Full
Full
-
2.0
2.4
-
-
-
-
-
-
-
0.3
±0.01
±0.05
-
±1.0
±10
0.4
-
0.8
-
-
V
V
V
V
μA
μA
V
V
V
CC
-0.6 V
CC
-0.1
4
ISL83220E
Electrical Specifications
Test Conditions: V
CC
= 3V to 5.5V, C
1
- C
4
= 0.1
μ
F; Unless Otherwise Specified.
Typicals are at T
A
= 25°C
(Continued)
TEST CONDITIONS
TEMP
(°C)
MIN
TYP
MAX
UNITS
PARAMETER
TIMING CHARACTERISTICS
Maximum Data Rate
Transmitter Propagation Delay
R
L
= 3kΩ, C
L
= 1000pF, One Transmitter Switching
Transmitter Input to
Transmitter Output,
R
L
= 3kΩ, C
L
= 1000pF
Receiver Input to Receiver
Output, C
L
= 150pF
Normal Operation
Normal Operation
t
PHL
- t
PLH
(Note 2)
t
PHL
- t
PLH
C
L
= 150pF to 2500pF
V
CC
= 3.3V,
R
L
= 3kΩ to 7kΩ,
C
L
= 150pF to 1000pF
Measured From 3V to -3V or
-3V to 3V
t
PHL
t
PLH
t
PHL
t
PLH
Full
25
25
25
25
25
25
25
Full
25
25
250
-
-
-
-
-
-
-
-
4
6
500
1.0
1.0
0.20
0.30
200
200
100
100
-
-
-
-
-
-
-
-
-
500
1000
30
30
kbps
μs
μs
μs
μs
ns
ns
ns
ns
V/μs
V/μs
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Receiver Skew
Transition Region Slew Rate
ESD PERFORMANCE
RS-232 Pins (T
OUT
, R
IN
)
Human Body Model
IEC61000-4-2 Contact Discharge
IEC61000-4-2 Air Gap Discharge
All Other Pins
NOTE:
2. Transmitter skew is measured at the transmitter zero crossing points.
Human Body Model
25
25
25
25
-
-
-
-
±15
±8
±15
±3
-
-
-
-
kV
kV
kV
kV
Detailed Description
The ISL83220E operates from a single +3V to +5.5V supply,
guarantees a 250kbps minimum data rate, requires only four
small external 0.1μF capacitors, features low power
consumption, and meets all ElA RS-232C and V.28
specifications. The circuit is divided into three sections: The
charge pump, the transmitter, and the receiver.
these transmitters deliver true RS-232 levels over a wide
range of single supply system voltages.
The transmitter output disables and assumes a high
impedance state when the device enters the powerdown
mode (see Table 2). This output may be driven to
±12V
when
disabled.
All devices guarantee a 250kbps data rate for full load
conditions (3kΩ and 1000pF), V
CC
≥
3.0V. Under more
typical conditions of V
CC
≥
3.3V, R
L
= 3kΩ, and C
L
= 250pF,
the ISL83220E easily operates at 900kbps.
Transmitter inputs float if left unconnected, and may cause
I
CC
increases.
Charge-Pump
Intersil’s new 3.3V family utilizes 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 these devices 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, even at V
CC
= 3.3V.
The charge pumps operate discontinuously (i.e., they turn off
as soon as the V+ and V- supplies are pumped up to the
nominal values), resulting in significant power savings.
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
(V
CC
= 0V). The receiver’s Schmitt trigger input stage uses
hysteresis to increase noise immunity and decrease errors
due to slow input signal transitions.
Transmitters
The transmitters are proprietary, low dropout, inverting
drivers that translate TTL/CMOS inputs to EIA/TIA-232
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