|
|
PDF ISL3241E Data sheet ( Hoja de datos )
| Número de pieza | ISL3241E | |
| Descripción | (ISL3241E / ISL3243E) RS-232 Transmitters/Receivers | |
| Fabricantes | Intersil | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ISL3241E (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
|
No Preview Available !
QFN Packaged, ±15kV ESD Protected, +2.7V to +3.6V,
250kbps, RS-232 Transmitters/Receivers with
Separate Logic Supply Pin
ISL3241E, ISL3243E
The Intersil ISL324xE devices are 2.7V to 3.6V powered
RS-232 transmitters/receivers which meet ElA/TIA-232 and
V.28/V.24 specifications, even at VCC = 3.0V. Additionally, they
provide ±15kV ESD protection (IEC61000-4-2 Air Gap and
Human Body Model) on transmitter outputs and receiver
inputs (RS-232 pins). Targeted applications are POS systems,
and notebook and laptop computers where the low
operational, and even lower standby, power consumption is
critical. Efficient on-chip charge pumps, coupled with manual
and automatic power-down functions, reduce the standby
supply current to a 0.5µA trickle. Tiny 5mmx5mm 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.
ISL324xE are 3 driver, 5 receiver devices that, coupled with the
5x5 QFN package, provide the industry’s smallest, lowest
power complete serial port. The 5x5 QFN requires 60% less
board area than a 28 Ld TSSOP, and is nearly 20% thinner.
These devices also include a noninverting always-active
receiver for “wake-up” capability.
The ISL3243E features an automatic powerdown function that
powers down the on-chip power supply and driver circuits. This
occurs when an attached peripheral device is shut off or the
RS-232 cable is removed, conserving system power
automatically without changes to the hardware or operating
system. It powers up again when a valid RS-232 voltage is
applied to any receiver input.
The ISL324xE feature a VL pin that adjusts the logic pin (see
“Pin Descriptions” on page 2) output levels and input
thresholds to values compatible with the VCC powering the
external logic (e.g., a UART).
Table 1 summarizes the features of the ISL324xE.
Features
• VL Pin for Compatibility in Mixed Voltage Systems Adjusts
Logic Output Levels and Input Thresholds for Compatibility
with Lower Supply Voltage Logic
• Parameters Specified for 10% Tolerance Supplies and Full
Industrial Temp Range
• Pb-free Small QFN (5mmx5mm) Package is 60% Smaller
than a 28 Lead TSSOP
• ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000)
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• RS-232 Compatible with VCC = 2.7V
• On-Chip Voltage Converters Require Only Four External
0.1µF Capacitors
• Manual and Automatic Power-down Features
• Receiver Hysteresis for Improved Noise Immunity
• Guaranteed Minimum Data Rate. . . . . . . . . . . . . . . . 250kbps
• Low Supply Current in Power-down State . . . . . . . . . . . 0.5µA
• Pb-Free (RoHS compliant)
Applications
• Any Space Constrained System Requiring RS-232 Ports
- Battery Powered, Hand-Held, and Portable Equipment
- POS Systems and Scanners
- Laptop Computers, Notebooks
- GPS Receivers
• Mixed Voltage Serial Ports
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
• Technical Brief TB379 “Thermal Characterization of
Packages for ICs”
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
PART NUMBER
ISL3241E
ISL3243E
NO. OF
Tx.
3
3
NO. OF
Rx.
5
5
LOGIC SUPPLY
(VL) PIN?
YES
YES
TABLE 1. SUMMARY OF FEATURES
NO. OF
MONITOR Rx.
(ROUTB)
2
DATA RATE
(kbps)
250
Rx. ENABLE
FUNCTION?
YES
1 250 NO
Pb-FREE?
YES
YES
MANUAL
POWER-
DOWN?
YES
YES
AUTOMATIC
POWERDOWN
FUNCTION?
NO
YES
June 18, 2012
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
FN6768.2
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2008, 2010, 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL3241E, ISL3243E
Absolute Maximum Ratings
VCC to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V
VL to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VCC + 0.3V)
V+ to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
V- to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3V to -7V
V+ to V-. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V
Input Voltages
TIN, FORCEOFF, FORCEON, EN, SHDN . . . . . . . . . . . . . . . . . . . -0.3V to 6V
RIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±25V
Output Voltages
TOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±13.2V
ROUT, INVALID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VL + 0.3V)
Short Circuit Duration
TOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
ESD Rating . . . . . . . . . . . . . . . . . . . . See “ESD PERFORMANCE” on page 7
Thermal Information
Thermal Resistance (Typical, Notes 4, 5) θJA (°C/W) θJC (°C/W)
32 Ld QFN Package . . . . . . . . . . . . . . . . . . .
32
1.8
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . -65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB379 for details.
5. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications Test Conditions: VCC = 3V to 3.6V, VL = 1.8V ±10%, C1 to C4 = 0.1µF, Unless Otherwise Specified.
Typicals are at TA = +25°C, VCC = 3.3V, VL = 1.8V, Unless Otherwise Specified. Boldface limits apply over the operating temperature range, -40°C
to +85°C.
PARAMETER
DC CHARACTERISTICS
TEST CONDITIONS
TEMP MIN
MAX
(°C) (Note 6) TYP (Note 6) UNITS
Operating Voltage Range
Supply Current, Automatic
Powerdown
Supply Current, Powerdown
Supply Current,
Automatic Powerdown Disabled
All RIN Open, FORCEON = GND, FORCEOFF = VL
VL = VCC (ISL3243E Only)
All RIN Open, FORCEOFF = SHDN = GND, VL = VCC
All Outputs Unloaded,
FORCEON = FORCEOFF = SHDN = VL, VCC = VL = 3.0V
LOGIC AND TRANSMITTER INPUTS; RECEIVER AND LOGIC OUTPUTS
Full 2.7 - 3.6 V
Full -
0.5 3 µA
Full -
25 -
Full -
0.5 3 µA
0.3 1.0 mA
0.3 1.5 mA
Input Logic Threshold Low
TIN, FORCEON, FORCEOFF, EN, SHDN
VL = VCC = 3V
Input Logic Threshold High
TIN, FORCEON, FORCEOFF, EN, SHDN
VL = VCC = 3.6V
Input Leakage Current
TIN, FORCEON, FORCEOFF, EN, SHDN
Output Leakage Current
FORCEOFF = GND (ISL3243E) or EN = VL (ISL3241E)
Output Voltage Low
(See Figure 21)
IOUT = 250µA, ROUT, ROUTB, INVALID
IOUT = 1.6mA, VL = VCC, ROUT, ROUTB, INVALID
Output Voltage High
(See Figure 21)
IOUT = -250µA, ROUT, ROUTB, INVALID
IOUT = -1.0mA, VL = VCC, ROUT, ROUTB, INVALID
AUTOMATIC POWERDOWN (ISL3243E Only, FORCEON = GND, FORCEOFF = VL)
Receiver Input Thresholds to
Enable Transmitters
ISL3243E Powers Up (See Figure 10)
Receiver Input Thresholds to
Disable Transmitters
ISL3243E Powers Down (See Figure 10)
Full -
-
Full -
-
Full 1.25
-
Full 2.0
-
Full - ±0.01
Full - ±0.05
Full -
-
Full -
-
Full VL - 0.25 VL - 0.1
Full VL - 0.6 VL - 0.1
Full -2.7
Full -0.3
-
-
0.5
0.8
-
-
±1.0
±10
0.45
0.4
-
-
2.7
0.3
V
V
V
V
µA
µA
V
V
V
V
V
V
5 FN6768.2
June 18, 2012
5 Page 
ISL3241E, ISL3243E
to the supply voltage of the UART, ASIC, or µcontroller
eliminates the need for a level shifter/translator between the
two ICs.
TABLE 3. VIH AND VIL vs VL FOR VCC = 3.3V
VL (V)
1.6
VIH (V)
0.85
VIL (V)
0.8
1.8
0.95
0.9
2.5
1.25
1.2
VL may range from 1.6V to VCC, and Table 3 indicates the
ISL324xE’s typical VIH and VIL levels for several VL values. Note
that the VL supply current increases significantly when
VL exceeds VCC (see Figure 20).
If logic translation isn’t required, connect VL to VCC.
VCCI = +3.3V
VCCL = +1.8V
the receiver inputs, INVALID switches high, and the power
management logic wakes up the interface block. INVALID can
also be used to indicate the DTR or RING INDICATOR signal, as
long as the other receiver inputs are floating, or driven to GND
(as in the case of a powered down driver).
2.7V
VALID RS-232 LEVEL - ISL3243E IS ACTIVE
INDETERMINATE - POWERDOWN MAY OR
MAY NOT OCCUR
0.3V
-0.3V
INVALID LEVEL - POWER-DOWN OCCURS AFTER 20ms
INDETERMINATE - POWERDOWN MAY OR
MAY NOT OCCUR
-2.7V
VALID RS-232 LEVEL - ISL3243E IS ACTIVE
FIGURE 10. DEFINITION OF VALID RS-232 RECEIVER LEVELS
TIN
VIH ≥ 2V
VOH ≤ 1.8V
TXD
GND
ROUT VOH ≥ 3V
RXD
INPUT
DIODE
GND
RS-232 IC WITH NO
VL PIN
UART/PROCESSOR
VCCI = +3.3V
VCCL = +1.8V
INVALID switches low after invalid levels have persisted on all
of the receiver inputs for more than 20µs (see Figure 11).
INVALID switches back high 1µs after detecting a valid RS-232
level on a receiver input. INVALID operates in all modes (forced
or automatic power-down, or forced on), so it is also useful for
systems employing manual power-down circuitry. When
automatic powerdown is utilized, INVALID = 0 indicates that the
ISL3243E is in powerdown mode.
RECEIVER
INPUTS
INVALID
} REGION
GND
VL
TIN VIH ≤ 1V
TXD
VOH ≤ 1.8V
ROUT VOH ≤ 1.8V
RXD
INPUT
DIODE
GND
ISL324xE
UART/PROCESSOR
FIGURE 9. USING VL PIN TO ADJUST LOGIC LEVELS
INVALID Output (ISL3243E Only)
The INVALID output always indicates whether or not a valid
RS-232 signal (see Figure 10) is present at any of the receiver
inputs (see Table 2), giving the user an easy way to determine
when the interface block should power down. Invalid receiver
levels occur whenever the driving peripheral’s outputs are shut
off (powered down) or when the RS-232 interface cable is
disconnected. In the case of a disconnected interface cable
where all the receiver inputs are floating (but pulled to GND by
the internal receiver pull down resistors), the INVALID logic
detects the invalid levels and drives the output low. The power
management logic then uses this indicator to power-down the
interface block. Reconnecting the cable restores valid levels at
TRANSMITTER
OUTPUTS
INVALID
OUTPUT
VL tINVL
0
AUTOPWDN
V+
tINVH
PWR UP
VCC
0
V-
FIGURE 11. AUTOMATIC POWERDOWN AND INVALID TIMING
DIAGRAMS
Automatic Power-down (ISL3243E Only)
Even greater power savings is available by using the ISL3243E
which features an automatic power-down function. When no
valid RS-232 voltages (see Figure 11) are sensed on any
receiver input for 20µs, the charge pump and transmitters
power-down, thereby reducing supply current to less than 1µA.
Invalid receiver levels occur whenever the driving peripheral’s
outputs are shut off (powered down) or when the RS-232
interface cable is disconnected. The ISL3243E powers back up
whenever it detects a valid RS-232 voltage level on any
receiver input. This automatic power-down feature provides
11 FN6768.2
June 18, 2012
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ISL3241E.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ISL3241E | (ISL3241E / ISL3243E) RS-232 Transmitters/Receivers | Intersil |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |