ICL3243EIA Datasheet, PDF (14/33 Pages) Intersil Corporation – ±15kV ESD Protected, +3V to +5.5V, 1μA, 250kbps, RS-232 Transmitters/Receivers

ICL3221E, ICL3222E, ICL3223E, ICL3232E, ICL3241E, ICL3243E
Electrical Specifications
Test Conditions: V_CC = 3V to 5.5V, C₁ - C₄ = 0.1µF; Unless Otherwise Specified.
Typicals are at T_A = +25°C. Boldface limits apply over the operating temperature
range. (Continued)
PARAMETER
TEST CONDITIONS
TEMP MIN
(°C) (Note 6)
TYP
MAX
(Note 6) UNITS
Receiver Output Disable
Time
Normal Operation (Except ICL3232E)
25
-
200
-
ns
Transmitter Skew
t_PHL to t_PLH (Note 5)
25
-
Receiver Skew
t_PHL to t_PLH
25
-
Transition Region Slew Rate V_CC = 3.3V,
C_L = 150pF to 2500pF
25
4
R_L = 3kΩ to 7kΩ,
Measured from 3V to
C_L = 150pF to 1000pF
25
6
-3V or -3V to 3V
100
-
ns
50
-
ns
-
30
V/µs
-
30
V/µs
ESD PERFORMANCE
RS-232 Pins (TOUT, RIN) Human Body Model
25
-
±15
-
kV
IEC61000-4-2 Contact Discharge
25
-
±8
-
kV
IEC61000-4-2 Air Gap Discharge
25
-
±15
-
kV
All Other Pins
Human Body Model
25
-
±2
-
kV
NOTES:
5. Transmitter skew is measured at the transmitter zero crossing points.
6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established
by characterization and are not production tested.
Detailed Description
ICL32xxE interface ICs operate from a single +3V 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. The circuit is divided
into three sections: charge pump, transmitters and
receivers.
Charge-Pump
Intersil’s new ICL32xxE 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 “Capacitor Selection” on page 18 and Table 3 on
page 18 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),
resulting in significant power savings.
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.
Except for the ICL3232E, all transmitter outputs
disable and assume a high impedance state when the
device enters the power-down mode (see Table 2).
These outputs 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, 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 900kbps.
Transmitter inputs float if left unconnected, and may
cause I_CC increases. Connect unused inputs to GND for
the best performance.
Receivers
All the ICL32xxE devices contain standard inverting
receivers that three-state (except for the ICL3232E)
via the EN or FORCEOFF control lines. Additionally, the
two ICL324XE products include noninverting
(monitor) receivers (denoted by the ROUTB label)
that are always active, regardless of the state of any
control lines. All the 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
(VCC = 0V). The receivers’ Schmitt trigger input
stage uses hysteresis to increase noise immunity and
decrease errors due to slow input signal transitions.
The ICL3221E, ICL3222E, ICL3223E, ICL3241E
inverting receivers disable only when EN is driven high.
ICL3243E receivers disable during forced (manual)
power-down, but not during automatic power-down
(see Table 2).
14
FN4910.21
February 22, 2010