ISL4260E Datasheet, PDF (5/11 Pages) Intersil Corporation – QFN Packaged, ±15kV ESD Protected, +3V to +5.5V, 150nA, 250kbps, RS-232 Transmitters/Receivers with Separate Logic Supply

ISL4260E
Electrical Specifications
PARAMETER
TTeyspticCaolsnadriteioantsT: _A^VC=^C25=^o3CV,
to 5.5V, C₁
V_CC = V_L =
- C₄ = 0.1μF, V_L =
3.3V (Continued)
V_CC;
Unless
Otherwise
Specified.
TEST CONDITIONS
TEMP MIN
MAX
(^oC) (Note 4) TYP (Note 4) UNITS
Input Resistance
25
3
5
7
kΩ
TRANSMITTER OUTPUTS
Output Voltage Swing
All Transmitter Outputs Loaded with 3kΩ to Ground
Full
±5.0
±5.4
-
V
Output Resistance
Output Short-Circuit Current
V_CC = V+ = V- = 0V, Transmitter Output = ±2V
Shorted to GND
Full
300
10M
-
Ω
Full
-
-
±60
mA
Output Leakage Current
TIMING CHARACTERISTICS
V_OUT = ±12V, V_CC = 0V or 3V to 5.5V, SHDN = GND
Full
-
-
±25
μA
Maximum Data Rate
Receiver Propagation Delay
Receiver Output Enable Time
R_L = 3kΩ, C_L = 1000pF, One Transmitter Switching
Receiver Input to Receiver t_PHL
Output, C_L = 150pF
t_PLH
Full
250
500
25
-
0.15
25
-
0.15
25
-
200
-
kbps
-
μs
-
μs
-
ns
Receiver Output Disable Time
25
-
200
-
ns
Transmitter Output Enable Time
Transmitter Skew
Receiver Skew
Transition Region Slew Rate
ESD PERFORMANCE
From SHDN Rising Edge to T_OUT = ±3.7V
t_PHL - t_PLH (Note 3)
t_PHL - t_PLH
R_L = 3kΩ to 7kΩ,
C_L = 150pF to 1000pF
Measured From 3V to -3V or
-3V to 3V, V_CC = 3.3V
C_L = 150pF to 2500pF
25
-
100
-
μs
25
-
100
-
ns
25
-
50
-
ns
25
6
18
30
V/μs
25
4
13
30
V/μs
RS-232 Pins (T_OUT, R_IN)
Human Body Model
IEC61000-4-2 Air Gap Discharge
25
-
±15
-
kV
25
-
±15
-
kV
IEC61000-4-2 Contact Discharge
25
-
±8
-
kV
NOTE:
3. Transmitter skew is measured at the transmitter zero crossing points.
4. 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
The ISL4260E 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 transmitters, and the receivers.
Charge-Pump
Intersil’s new ISL4260E 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 over the full V_CC
range; other capacitor combinations can be used as shown
in Table 3. 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.
All transmitter outputs disable and assume a high
impedance state when the device enters the powerdown
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
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