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ISL83387E の電気的特性と機能

ISL83387EのメーカーはIntersil Corporationです、この部品の機能は「+/-15kV ESD Protected/+3#V to +5.5V/ 1Microamp/ 250kbps/ RS-232 Transceivers with Enhanced Automatic Powerdown and a Separate Logic Supply」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL83387E
部品説明 +/-15kV ESD Protected/+3#V to +5.5V/ 1Microamp/ 250kbps/ RS-232 Transceivers with Enhanced Automatic Powerdown and a Separate Logic Supply
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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ISL83387E Datasheet, ISL83387E PDF,ピン配置, 機能
®
Data Sheet
February 2003
ISL83387E
FN6040
+/-15kV ESD Protected, +3V to +5.5V,
1Microamp, 250kbps, RS-232
Transceivers with Enhanced Automatic
Powerdown and a Separate Logic Supply
The Intersil ISL83387E is a 3.0V to 5.5V powered RS-232
transceiver which meets ElA/TIA-232 and V.28/V.24
specifications, even at VCC = 3.0V. Additionally, it provides
±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 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 enhanced automatic powerdown functions, reduce the
standby supply current to a 1µA trickle. TSSOP 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 ISL83387E features a VL pin that adjusts the logic pin
output levels and input thresholds to values compatible with
the VCC powering the external logic (e.g., a UART).
This device includes an enhanced automatic powerdown
function which powers down the on-chip power-supply and
driver circuits. This occurs when all receiver and transmitter
inputs detect no signal transitions for a period of 30 seconds.
It power back up, automatically, whenever it senses a
transition on any transmitter or receiver input.
Table 1 summarizes the features of the ISL83387E, while
Application Note AN9863 summarizes the features of each
device comprising the 3V RS-232 family.
Ordering Information
PART NO.
(BRAND)
ISL83387EIV
(83387EIV)
ISL83387EIV-T
(83387EIV)
TEMP.
RANGE (oC)
PACKAGE
-40 to 85 24 Ld TSSOP
-40 to 85 Tape and Reel
PKG. NO.
M24.173
M24.173
Features
• VL Supply Pin for Compatibility with Mixed Voltage
Systems
• ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000)
• Low Power, Pin Compatible Upgrade for MAX3387E
• Manual and Enhanced Automatic Powerdown Features
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• On-Chip Charge Pumps Require Only Four External
0.1µF Capacitors
• Receivers Stay Active in Powerdown
• 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. . . . . . . . . < 1µA
Applications
• Any System Requiring RS-232 Communication Ports
- Battery Powered, Hand-Held, and Portable Equipment
- Laptop Computers, Notebooks, Palmtops
- Digital Cameras
- PDA’s and PDA Cradles
- Cellular/Mobile Phones
PART
NUMBER
ISL83387E
TABLE 1. SUMMARY OF FEATURES
NO. OF NO. OF DATARATE Rx. ENABLE
Tx. Rx.
(kbps) FUNCTION?
VL LOGIC
SUPPLY PIN?
MANUAL
ENHANCED AUTOMATIC
POWER- DOWN? POWERDOWN FUNCTION?
33
250
NO
YES
YES
YES
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





ISL83387E pdf, ピン配列
Typical Operating Circuit
ISL83387E
+3.3V
C1
0.1µF
C2
0.1µF
+
0.1µF
1
+ C1+
3 C1-
+ 4 C2+
5 C2-
T1IN
7
T2IN
8
TTL/CMOS
LOGIC LEVELS
10
T3IN
14
R1OUT
13
R2OUT
23
VCC
T1
T2
T3
R1
R2
12
R3OUT
R3
LOGIC VCC
+
0.1µF
15 VL
11
FORCEON
VCC
TO POWER
CONTROL LOGIC
24
FORCEOFF
9
INVALID GND
22
2
V+
+
C3
0.1µF
V- 6
21
C4
+0.1µF
T1OUT
20 T2OUT RS-232
LEVELS
19
T3OUT
18
5k
R1IN
17
5k
R2IN
16
5k
R3IN
RS-232
LEVELS
3


3Pages


ISL83387E 電子部品, 半導体
ISL83387E
Detailed Description
The ISL83387E 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 ISL83387E 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 (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 1.25Mbps.
The transmitter input threshold is set by the voltage applied
to the VL supply pin. Transmitter inputs float if left
unconnected (there are no pull-up resistors), and may cause
ICC increases. Connect unused inputs to GND for the best
performance.
Receivers
The ISL83387E contains standard inverting receivers that
convert RS-232 signals to CMOS output levels and accept
inputs up to ±25V while presenting the required 3kto 7k
input 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. Receiver outputs swing
from GND to VL, and do not tristate in powerdown (see
Table 2).
VL
RXIN
-25V VRIN +25V
GND
5k
RXOUT
GND VROUT VL
FIGURE 1. RECEIVER CONNECTIONS
Low Power Operation
This 3V device requires 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 11mA
current required by comparable 5V RS-232 devices,
allowing users to reduce system power simply by replacing
the old style device with the ISL83387E in new designs.
Powerdown Functionality
The already low current requirement drops significantly
when the device enters powerdown mode. In powerdown,
supply current drops to 1µA, because the on-chip charge
pump turns off (V+ collapses to VCC, V- collapses to GND),
and the transmitter outputs tristate. This micro-power mode
makes these devices ideal for battery powered and portable
applications.
Software Controlled (Manual) Powerdown
This device allows the user to force the IC into the low
power, standby state, and utilizes a two pin approach where
the FORCEON and FORCEOFF inputs determine the IC’s
mode. For always enabled operation, FORCEON and
FORCEOFF are both strapped high. To switch between
active and powerdown modes, under logic or software
control, only the FORCEOFF input need be driven. The
FORCEON state isn’t critical, as FORCEOFF dominates
over FORCEON. Nevertheless, if strictly manual control over
powerdown is desired, the user must strap FORCEON high
to disable the enhanced automatic powerdown circuitry.
Connecting FORCEOFF and FORCEON together disables
the enhanced automatic powerdown feature, enabling them
to function as a manual SHUTDOWN input (see Figure 2).
With any of the above control schemes, the time required to
exit powerdown, and resume transmission is only 100µs.
When using both manual and enhanced automatic
powerdown (FORCEON = 0), the ISL83387E won’t power
up from manual powerdown until both FORCEOFF and
FORCEON are driven high, or until a transition occurs on a
receiver or transmitter input. Figure 3 illustrates a circuit for
ensuring that the ISL83387E powers up as soon as
FORCEOFF switches high. The rising edge of the Master
Powerdown signal forces the device to power up, and the
ISL83387E returns to enhanced automatic powerdown
6

6 Page



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部品番号部品説明メーカ
ISL83387E

+/-15kV ESD Protected/+3#V to +5.5V/ 1Microamp/ 250kbps/ RS-232 Transceivers with Enhanced Automatic Powerdown and a Separate Logic Supply

Intersil Corporation
Intersil Corporation


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