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
= 0.1µF; Unless Otherwise Specified.
Typicals are at T
A
= 25°C
TEST CONDITIONS
TEMP
(°C)
MIN
TYP
MAX
UNITS
µA
mA
PARAMETER
DC CHARACTERISTICS
Supply Current, Automatic
Powerdown
Supply Current,
Automatic Powerdown Disabled
All R
IN
Open (ICL3217 Only)
All Outputs Unloaded
25
25
-
-
1.0
0.3
10
1.0
TRANSMITTER INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold Low
Input Logic Threshold High
T
IN
T
IN
T
IN
V
CC
= 3.3V
V
CC
= 5.0V
Input Leakage Current
Output Leakage Current
(ICL3217 Only)
Output Voltage Low
Output Voltage High
I
OUT
= 1.6mA
I
OUT
= -1.0mA
ICL3217 Powers Up (Figure 4)
ICL3217 Powers Down (Figure 4)
Full
Full
Full
Full
Full
Full
Full
-
2.0
2.4
-
-
-
-
-
-
±0.01
±0.05
-
0.8
-
-
±1.0
±10
0.4
-
V
V
V
µA
µA
V
V
V
CC
-0.6 V
CC
-0.1
-2.7
-0.3
-
-
-
-
100
30
AUTOMATIC POWERDOWN
(ICL3217 Only)
Receiver Input Thresholds to
Enable Transmitters
Receiver Input Thresholds to
Disable Transmitters
Receiver Threshold to Transmitters
Enabled Delay (t
WU
)
Receiver Positive or Negative
Threshold to Transmitters
Disabled Delay
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
Full
25
25
25
25
-25
0.6
0.8
-
-
-
1.2
1.5
1.5
1.8
25
-
-
2.4
2.4
V
V
V
V
V
Full
Full
25
25
2.7
0.3
-
-
V
V
µs
µs
4
ICL3207, ICL3217
Electrical Specifications
Test Conditions: V
CC
= 3V to 5.5V, C
1
- C
4
= 0.1µF; Unless Otherwise Specified.
Typicals are at T
A
= 25°C
(Continued)
TEST CONDITIONS
TEMP
(°C)
25
25
MIN
-
3
±5.0
300
-
-
TYP
0.3
5
±5.4
10M
±35
-
MAX
-
7
UNITS
V
kΩ
PARAMETER
Input Hysteresis
Input Resistance
TRANSMITTER OUTPUTS
Output Voltage Swing
Output Resistance
Output Short-Circuit Current
Output Leakage Current
(ICL3217 Only)
TIMING CHARACTERISTICS
Maximum Data Rate
(One Transmitter Switching)
All Transmitter Outputs Loaded with 3kΩ to Ground
V
CC
= V+ = V- = 0V, Transmitter Output =
±2V
V
OUT
=
±12V,
V
CC
= 0V or 3V to 5.5V
In Automatic Powerdown
Full
Full
Full
Full
-
-
±60
±25
V
Ω
mA
µA
V
CC
= 3.15V, C
1
- C
4
= 0.1µF, R
L
= 3kΩ, C
L
= 1000pF
V
CC
= 3.0V, C
1
- C
4
= 0.22µF, R
L
= 3kΩ, C
L
= 1000pF
V
CC
≥
4.5V, C
1
- C
4
= 0.1µF, R
L
= 3kΩ, C
L
= 1000pF
Receiver Input to Receiver
Output, C
L
= 150pF
t
PHL
- t
PLH
t
PHL
- t
PLH
C
L
= 200pF to 2500pF
V
CC
= 3.3V, R
L
= 3kΩ to 7kΩ,
Measured From +3V to -3V or -3V
C
L
= 200pF to 1000pF
to +3V
t
PHL
t
PLH
Full
Full
Full
25
25
Full
Full
25
25
250
250
250
-
-
-
-
4
6
500
286
310
0.3
0.3
200
100
15
15
-
-
-
-
-
1000
500
30
30
kbps
kbps
kbps
µs
µs
ns
ns
V/µs
V/µs
Receiver Propagation Delay
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
Human Body Model
25
25
25
25
-
-
-
-
±15
±8
±6
±2
-
-
-
-
kV
kV
kV
kV
Detailed Description
The ICL32X7 interface ICs operate from a single +3V to
+5.5V power 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. The circuit is divided into three
sections: The charge pump, the transmitters, and the
receivers.
Transmitters
The transmitters are proprietary, low dropout, inverting
drivers that translate TTL/CMOS inputs to EIA/TIA-232
output levels. Coupled with the on-chip
±5.5V
supplies,
these transmitters deliver true RS-232 levels over a wide
range of single supply system voltages.
ICL3217 transmitter outputs disable and assume a high
impedance state when the device enters the automatic
powerdown mode. These outputs may be driven to
±12V
when disabled.
Both devices guarantee a 250kbps data rate for full load
conditions (3kΩ and 1000pF), V
CC
≥
3.0V, with one
transmitter operating at full speed. Under more typical
conditions of V
CC
≥
3.3V, R
L
= 3kΩ, and C
L
= 250pF, one
transmitter easily operates at 800kbps.
Transmitter inputs float if left unconnected, and may cause
I
CC
increases. Connect unused inputs to GND for the best
performance.
Charge-Pump
Intersil’s new ICL32XX 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 at V
CC
= 3.3V. See
the “Capacitor Selection” section, and Table 3 for capacitor
recommendations for other operating conditions. 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),
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