Active Low Output that indicates if no valid RS-232 levels are present on any receiver input.
FUNCTION
FORCEOFF Active Low to Shut Down Transmitters and On-Chip Power Supply. This overrides any automatic circuitry and FORCEON (see Table 2,
Note 1).
FORCEON Active High Input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high, Note 1).
NOTE:
1. These input pins incorporate positive feedback resistors. Once the input is driven to a valid logic level, the feedback resistor maintains that logic
level until V
CC
is removed. Unused transmitter inputs may be left unconnected by the user.
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:
4.
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
= 3.15V to 5.5V, C
1
- C
4
= 0.1µF; V
CC
= 3V, C
1
- C
4
= 0.22µF; Unless Otherwise
Specified. Typicals are at T
A
= 25
o
C
TEST CONDITIONS
TEMP
(
o
C)
MIN
TYP
MAX
UNITS
PARAMETER
DC CHARACTERISTICS
Supply Current, Automatic
Powerdown
Supply Current, Powerdown
Supply Current,
Automatic Powerdown Disabled
All R
IN
Open, FORCEON = GND, FORCEOFF = V
CC
FORCEOFF = GND
All Outputs Unloaded, FORCEON = FORCEOFF = V
CC
25
25
25
-
-
-
10
10
0.3
300
300
1.0
nA
nA
mA
LOGIC AND TRANSMITTER INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold Low
T
IN
Active
T
IN
, FORCEON, FORCEOFF
Wake up Threshold
Input Logic Threshold High
T
IN
Active
T
IN
, FORCEON, FORCEOFF
Wake up Threshold
Input Leakage Current
Output Leakage Current
Output Voltage Low
Output Voltage High
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
25
-25
0.6
0.8
-
-
-
3
-
1.2
1.5
1.5
1.8
0.6
5
25
-
-
2.4
2.4
-
7
V
V
V
V
V
V
k
V
CC
= 3.3V
V
CC
= 5.0V
V
CC
= 3.6V
V
CC
= 3.3V
V
CC
= 5.0V
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
-
-
-
2.0
2.0
2.4
-
-
-
-
-
-
-
-
-
0.01
0.05
-
0.8
0.8
0.8
-
-
-
1.0
10
0.4
-
V
V
V
V
V
V
µA
µA
V
V
T
IN
, FORCEON, FORCEOFF, V
IN
= 0V or V
CC
(Note 5)
FORCEOFF = GND
I
OUT
= 1.0mA
I
OUT
= -1.0mA
V
CC
-0.6 V
CC
-0.1
FN6012 Rev 3.00
July 2004
Page 4 of 14
ICL3238E
Electrical Specifications
Test Conditions: V
CC
= 3.15V to 5.5V, C
1
- C
4
= 0.1µF; V
CC
= 3V, C
1
- C
4
= 0.22µF; Unless Otherwise
Specified. Typicals are at T
A
= 25
o
C
(Continued)
TEST CONDITIONS
TEMP
(
o
C)
MIN
TYP
MAX
UNITS
PARAMETER
ENHANCED AUTOMATIC POWERDOWN
(FORCEON = GND, FORCEOFF = V
CC
)
Receiver Input Thresholds to
INVALID High
Receiver Input Thresholds to
INVALID Low
INVALID Output Voltage Low
INVALID Output Voltage High
Receiver Positive or Negative
Threshold to INVALID High Delay
(t
INVH
)
Receiver Positive or Negative
Threshold to INVALID Low Delay
(t
INVL
)
Receiver or Transmitter Edge to
Transmitters Enabled Delay (t
WU
)
Receiver or Transmitter Edge to
Transmitters Disabled Delay
(t
AUTOPWDN
)
TRANSMITTER OUTPUTS
Output Voltage Swing
Output Resistance
Output Short-Circuit Current
Output Leakage Current
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation Delay
R
L
= 3kC
L
= 1000pF, One Transmitter Switching
Receiver Input to Receiver
Output, C
L
= 150pF
Normal Operation
Normal Operation
t
PHL
- t
PLH
t
PHL
- t
PLH
V
CC
= 3.3V,
R
L
= 3kto 7k
Measured From 3V to -3V or -3V
to 3V
C
L
= 150pF to 1000pF
C
L
= 150pF to 2500pF
t
PHL
t
PLH
Full
25
25
25
25
25
25
25
25
250
-
-
-
-
-
-
6
4
500
0.15
0.15
150
300
50
50
15
12
-
-
-
-
-
-
-
30
30
kbps
µs
µs
ns
ns
ns
ns
V/µs
V/µs
V
OUT
=12V, V
CC
= 0V or 3V to 5.5V,
Automatic Powerdown or FORCEOFF = GND
All Transmitter Outputs Loaded with 3k to Ground
V
CC
= V+ = V- = 0V, Transmitter Output =
2V
Full
Full
Full
Full
5.0
300
-
-
5.4
10M
35
-
-
-
60
25
V
mA
µA
(Note 6)
(Note 6)
(Figure 6)
(Figure 6)
I
OUT
= 1.0mA
I
OUT
= -1.0mA
Full
Full
Full
Full
25
-2.7
-0.3
-
V
CC
-0.6
-
-
-
-
-
0.3
2.7
0.3
0.4
-
-
V
V
V
V
µs
25
-
60
-
µs
25
Full
-
15
25
30
-
60
µs
s
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
)
IEC61000-4-2 Air Gap Discharge
IEC61000-4-2 Contact Discharge
Human Body Model
All Other Pins
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.
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