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PDF ISL4260E Data sheet ( Hoja de datos )
| Número de pieza | ISL4260E | |
| Descripción | QFN Packaged/ 15kV ESD Protected/ +3V to +5..5V/ 150nA/ 250kbps/ RS-232 Transmitters/Receivers with Separate Logic Supply | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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®
Data Sheet
January 2003
ISL4260E
FN6035
QFN Packaged, ±15kV ESD Protected, +3V
to +5.5V, 150nA, 250kbps, RS-232
Transmitters/Receivers with Separate
Logic Supply
The ISL4260E contains 3.0V to 5.5V powered RS-232
transmitters/receivers which meet ElA/TIA-232 and
V.28/V.24 specifications, even at VCC = 3.0V. Targeted
applications are PDAs, Palmtops, and cell phones where the
low operational, and even lower standby, power consumption
is critical. Efficient on-chip charge pumps, coupled with a
manual powerdown function reduces the standby supply
current to a 150nA trickle. Tiny 5mm x 5mm Quad Flat No-
Lead (QFN) packaging, and the use of small, low value
capacitors ensure board space savings as well. Data rates
greater than 250kbps are guaranteed at worst case load
conditions.
The ISL4260E features a VL pin that adjusts the logic pin
(see Pin Descriptions table) output levels and input
thresholds to values compatible with the VCC powering the
external logic (e.g., a UART).
The single pin powerdown function (SHDN = 0) disables all
the receiver and transmitter outputs, while shutting down the
charge pump to minimize supply current drain.
Table 1 summarizes the features of the ISL4260E, while
Application Note AN9863 summarizes the features of each
device comprising the 3V RS-232 family.
Ordering Information
PART
NUMBER
ISL4260EIR
ISL4260EIR-T
TEMP.
RANGE (oC)
PACKAGE
-40 to 85 32 Lead QFN
-40 to 85 32 Lead QFN
Tape & Reel
PKG. NO.
L32.5x5
L32.5x5
Features
• Available in Near Chip Scale QFN (5mmx5mm) Package
• VL Pin for Compatibility with Mixed Voltage Systems
• ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000)
• Single SHDN Pin Disables Transmitters and Receivers
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• On-Chip Charge Pumps Require Only Four External
0.1µF Capacitors
• Receiver Hysteresis For Improved Noise Immunity
• Very Low Supply Current . . . . . . . . . . . . . . . . . . . . 300µA
• Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps
• Wide Power Supply Range. . . . . . . . Single +3V to +5.5V
• Low Supply Current in Powerdown State . . . . . . . . .150nA
Applications
• Any System Requiring RS-232 Communication Ports
- Battery Powered, Hand-Held, and Portable Equipment
- Laptop Computers, Notebooks, Palmtops
- Digital Cameras
- PDAs and PDA Cradles
- Cellular/Mobile Phones
PART
NUMBER
ISL4260E
TABLE 1. SUMMARY OF FEATURES
NO. OF NO. OF DATA RATE Rx. ENABLE
Tx. Rx.
(kbps) FUNCTION?
VL LOGIC
SUPPLY PIN?
MANUAL
AUTOMATIC
POWER- DOWN? POWERDOWN FUNCTION?
32
250
NO
YES
YES
NO
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003. All Rights Reserved
1 page  
ISL4260E
Electrical Specifications
TTyepsticCaolsnadrietioantsT:AV=CC25=o3CV, VtoCC5.5=VV, LC1=
- C4 = 0.1µF, VL =
3.3V (Continued)
VCC;
Unless
Otherwise
Specified.
PARAMETER
TEST CONDITIONS
TEMP
(oC) MIN TYP MAX
TRANSMITTER OUTPUTS
Output Voltage Swing
All Transmitter Outputs Loaded with 3kΩ to Ground
Full ±5.0 ±5.4
-
Output Resistance
Output Short-Circuit Current
VCC = V+ = V- = 0V, Transmitter Output = ±2V
Shorted to GND
Full 300 10M
-
Full -
- ±60
Output Leakage Current
TIMING CHARACTERISTICS
VOUT = ±12V, VCC = 0V or 3V to 5.5V, SHDN = GND
Full -
- ±25
Maximum Data Rate
Receiver Propagation Delay
Receiver Output Enable Time
RL = 3kΩ, CL = 1000pF, One Transmitter Switching
Receiver Input to Receiver tPHL
Output, CL = 150pF
tPLH
Full 250
500
25 - 0.15
25 - 0.15
25 - 200
-
-
-
-
Receiver Output Disable Time
25 - 200 -
Transmitter Output Enable Time
Transmitter Skew
Receiver Skew
Transition Region Slew Rate
ESD PERFORMANCE
From SHDN Rising Edge to TOUT = ±3.7V
tPHL - tPLH (Note 2)
tPHL - tPLH
RL = 3kΩ to 7kΩ,
CL = 150pF to 1000pF
Measured From 3V to -3V or
-3V to 3V, VCC = 3.3V
CL = 150pF to 2500pF
25 - 100 -
25 - 100 -
25 - 50 -
25 6
18 30
25 4
13 30
RS-232 Pins (TOUT, RIN)
Human Body Model
IEC61000-4-2 Air Gap Discharge
25 - ±15 -
25 - ±15 -
IEC61000-4-2 Contact Discharge
25 - ±8 -
NOTE:
2. Transmitter skew is measured at the transmitter zero crossing points.
UNITS
V
Ω
mA
µA
kbps
µs
µs
ns
ns
µs
ns
ns
V/µs
V/µs
kV
kV
kV
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 VCC 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 VCC
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), VCC ≥ 3.0V, with one
transmitter operating at full speed. Under more typical
conditions of VCC ≥ 3.3V, RL = 3kΩ, and CL = 250pF, one
transmitter easily operates at 1.25Mbps.
The transmitter input threshold is set by the voltage applied
to the VL pin. Transmitter inputs float if left unconnected
5
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