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ISL4223E の電気的特性と機能

ISL4223EのメーカーはIntersil Corporationです、この部品の機能は「QFN Packaged/ +/-15kV ESD Protected/ +2.7V to +5.5V/ 150Nanoamp/ 250kBps/ RS-232 Transmitters/Receivers」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL4223E
部品説明 QFN Packaged/ +/-15kV ESD Protected/ +2.7V to +5.5V/ 150Nanoamp/ 250kBps/ RS-232 Transmitters/Receivers
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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ISL4223E Datasheet, ISL4223E PDF,ピン配置, 機能
®
Data Sheet
ISL4221E, ISL4223E
April 2003
FN6045
QFN Packaged, +/-15kV ESD Protected,
+2.7V to +5.5V, 150Nanoamp, 250kBps,
RS-232 Transmitters/Receivers
Features
• Available in Near Chip Scale QFN (5mmx5mm) Package
which is 40% Smaller than a 20 Lead TSSOP
The Intersil ISL422XE devices are 2.7V to 5.5V 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 PDAs,
Palmtops, and hand-held products where the low
operational, and even lower standby, power consumption is
critical. Efficient on-chip charge pumps, coupled with manual
and automatic powerdown functions, reduce 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.
• 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 Powerdown Features
• Receiver Hysteresis For Improved Noise Immunity
• Guaranteed Minimum Data Rate . . . . . . . . . . . . 250kBps
• Wide Power Supply Range . . . . . . Single +2.7V to +5.5V
• Low Supply Current in Powerdown State. . . . . . . . .150nA
Applications
The ISL4221E is a 1 driver, 1 receiver device and the
ISL4223E is a 2 driver, 2 receiver device that, coupled with
the 5x5 QFN package, provide the industry’s smallest,
lowest power serial port suitable for PDAs, and hand-held
applications. The 5x5 QFN requires 40% less board area
than a 20 lead TSSOP, and is nearly 20% thinner.
• Any Space Constrained System Requiring RS-232 Ports
- Battery Powered, and Portable Equipment
- Hand-Held Products (GPS Receivers, Bar Code
Scanners, etc.)
- PDAs and Palmtops, Data Cables
- Cellular/Mobile Phones, Digital Cameras
The ISL422XE features an automatic powerdown function
that powers down the on-chip power-supply and driver
Related Literature
circuits. This occurs when an attached peripheral device is
shut off or the RS-232 cable is removed, conserving system
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
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.
Table 1 summarizes the features of the ISL422XE, while
Application Note AN9863 summarizes the features of each
• ”Technical Brief TB379 “Thermal Characterization of
Packages for ICs”
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
device comprising the 3V RS-232 family.
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
NO. OF NO. OF QFN PKG.
Tx. Rx. AVAILABLE?
DATA RATE
(kBps)
Rx. ENABLE
MANUAL
AUTOMATIC POWERDOWN
FUNCTION? POWERDOWN?
FUNCTION?
ISL4221E 1 1
YES
250
YES
YES
YES
ISL4223E 2 2
YES
250
YES
YES
YES
Ordering Information
PART NO.
ISL4221EIR
ISL4221EIR-T
ISL4223EIR
ISL4223EIR-T
TEMP. RANGE
(oC)
PACKAGE
-40 to 85 16 Ld QFN
-40 to 85
16 Ld QFN
Tape & Reel
-40 to 85 20 Ld QFN
-40 to 85
20 Ld QFN
Tape & Reel
PKG. NO.
L16.5x5
L16.5x5
L20.5x5
L20.5x5
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





ISL4223E pdf, ピン配列
Typical Operating Circuits
ISL4221E, ISL4223E
ISL4221E
+3.3V
+
0.1µF
C1
0.1µF
C2
0.1µF
16
+
C1+
2 C1-
3
+
C2+
4
C2-
TTL/CMOS
LOGIC
LEVELS
T1IN
R1OUT
9
7
15 EN
13
VCC
T1
R1
1
V+
+ C3
0.1µF
V- 5
11
C4
+0.1µF
T1OUT
6
5k
R1IN
RS-232
LEVELS
14
FORCEOFF
VCC
10 8
FORCEON
INVALID
GND
TO POWER
CONTROL LOGIC
12
ISL4223E
+3.3V
+ 0.1µF
C1
0.1µF
C2
0.1µF
20
+ C1+
2
C1-
3
+
C2+
4
C2-
11
T1IN
TTL/CMOS
LOGIC LEVELS
10
T2IN
13
R1OUT
R2OUT
8
19 EN
17
VCC
T1
T2
1
V+
V- 5
15
6
14
R1 5k
7
R2 5k
18
FORCEOFF
12
FORCEON
9
INVALID
GND
16
+ C3
0.1µF
C4
+0.1µF
T1OUT
T2OUT
R1IN
RS-232
LEVELS
R2IN
VCC
TO POWER
CONTROL LOGIC
3


3Pages


ISL4223E 電子部品, 半導体
ISL4221E, ISL4223E
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.
The devices guarantee a 250kBps data rate for full load
conditions (3kand 1000pF), VCC 3.0V, with one
transmitter operating at full speed. Under more typical
conditions of VCC 3.3V, RL = 3k, and CL = 250pF, one
transmitter easily operates at 900kBps.
Transmitter inputs float if left unconnected, and may cause
ICC increases. Connect unused inputs to GND for the best
performance.
Receivers
All the ISL422XE devices contain standard inverting
receivers that three-state via the EN control line. All the
receivers convert RS-232 signals to CMOS output levels and
accept inputs up to ±25V while presenting the required 3k
to 7kinput 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.
VCC
RXIN
-25V VRIN +25V
GND
5k
RXOUT
GND VROUT VCC
FIGURE 1. INVERTING RECEIVER CONNECTIONS
Receivers driving a powered down UART must be disabled
to prevent current flow through, and possible damage to, the
UART’s protection diodes (see Figures 2 and 3). This can be
accomplished on the ISL422XE by driving the EN input high
whenever the UART powers down. Figure 3 also shows that
the INVALID output can be used to determine when the
UART should be powered down. When the RS-232 cable is
disconnected, INVALID switches low indicating that the
UART is no longer needed. Reconnecting the cable drives
INVALID back high, indicating that the UART should be
powered up.
Low Power Operation
These 3V devices require a nominal supply current of
0.3mA, even at VCC = 5.5V, during normal operation (not in
powerdown mode). This is considerably less than the 5mA
to 11mA current required by comparable 5V RS-232
devices, allowing users to reduce system power simply by
switching to this new family.
Powerdown Functionality
The already low current requirement drops significantly
when the device enters powerdown mode. In powerdown,
supply current drops to 150nA, because the on-chip charge
pump turns off (V+ collapses to VCC, V- collapses to GND),
and the transmitter outputs three-state. Receiver outputs are
unaffected by powerdown; refer to Table 2 for details. This
micro-power mode makes the ISL422XE ideal for battery
powered and portable applications.
VCC
VCC
VCC
CURRENT
FLOW
POWERED
DOWN
UART
GND
Rx
Tx
VOUT = VCC
SHDN = GND
OLD
RS-232 CHIP
FIGURE 2. POWER DRAIN THROUGH POWERED DOWN
PERIPHERAL
VCC
TRANSITION
DETECTOR
TO
WAKE-UP
LOGIC
VCC
ISL422XE
INVALID
RX
POWERED
DOWN
UART
TX
VOUT = HI-Z
ROUT
TIN
EN = VCC
RIN
TOUT
FIGURE 3. DISABLED RECEIVERS PREVENT POWER DRAIN
Software Controlled (Manual) Powerdown
The ISL422XE family provides pins that allow the user to
force the IC into the low power, standby state.
The ISL422XE utilize a two pin approach where the
FORCEON and FORCEOFF inputs determine the IC’s
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共有リンク

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部品番号部品説明メーカ
ISL4223E

RS-232 Transmitters/Receiver

Intersil
Intersil
ISL4223E

QFN Packaged/ +/-15kV ESD Protected/ +2.7V to +5.5V/ 150Nanoamp/ 250kBps/ RS-232 Transmitters/Receivers

Intersil Corporation
Intersil Corporation


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