ISL4260E Intersil Corporation, ISL4260E Datasheet - Page 5

• Manufacturer Part Number: ISL4260E
• Description: QFN Packaged, 15kV Esd Protected, +3V to +5.5V, 150nA, 250kbps, RS-232 Transmitters/receivers With Separate Logic Supply
• Manufacturer: Intersil Corporation

Electrical Specifications
NOTE:
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
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
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
TRANSMITTER OUTPUTS
Output Voltage Swing
Output Resistance
Output Short-Circuit Current
Output Leakage Current
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Output Enable Time
Transmitter Skew
Receiver Skew
Transition Region Slew Rate
ESD PERFORMANCE
RS-232 Pins (T
2. Transmitter skew is measured at the transmitter zero crossing points.
PARAMETER
OUT
, R
IN
)
5
Test Conditions: V
Typicals are at T
All Transmitter Outputs Loaded with 3kΩ to Ground
V
Shorted to GND
V
R
Receiver Input to Receiver
Output, C
From SHDN Rising Edge to T
t
t
R
Measured From 3V to -3V or
-3V to 3V, V
Human Body Model
IEC61000-4-2 Air Gap Discharge
IEC61000-4-2 Contact Discharge
PHL
PHL
OUT
CC
L
L
= 3kΩ, C
= 3kΩ to 7kΩ,
= V+ = V- = 0V, Transmitter Output = ±2V
- t
- t
= ±12V, V
PLH
PLH
L
= 150pF
(Note 2)
CC
L
CC
= 1000pF, One Transmitter Switching
A
= 3.3V
CC
CC
= 25
supply as
TEST CONDITIONS
= 0V or 3V to 5.5V, SHDN = GND
= 3V to 5.5V, C
o
CC
C, V
CC
ISL4260E
t
t
OUT
C
C
PHL
PLH
= V
L
L
= 150pF to 1000pF
= 150pF to 2500pF
L
= ±3.7V
1
= 3.3V (Continued)
- C
4
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
transmitter operating at full speed. Under more typical
conditions of V
transmitter easily operates at 1.25Mbps.
The transmitter input threshold is set by the voltage applied
to the V
= 0.1
µ
F, V
L
pin. Transmitter inputs float if left unconnected
L
= V
CC
CC
; Unless Otherwise Specified.
TEMP
(
≥ 3.3V, R
Full
Full
Full
Full
Full
o
25
25
25
25
25
25
25
25
25
25
25
25
C)
±5.0
MIN
300
250
L
6
4
-
-
-
-
-
-
-
-
-
-
-
-
= 3kΩ, and C
CC
≥ 3.0V, with one
TYP
±5.4
10M
0.15
0.15
500
200
200
100
100
±15
±15
50
18
13
±8
-
-
L
= 250pF, one
MAX
±60
±25
30
30
-
-
-
-
-
-
-
-
-
-
-
-
-
UNITS
kbps
V/µs
V/µs
mA
µA
µs
µs
µs
kV
kV
kV
ns
ns
ns
ns
V
Ω