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參數(shù)資料
| 型號(hào)： | ISL83385ECB |
| 廠商： | INTERSIL CORP |
| 元件分類(lèi)： | 通用總線功能 |
| 英文描述： | Octal Bus Transceivers With 3-State Outputs 20-TSSOP -40 to 85 |
| 中文描述： | DUAL LINE TRANSCEIVER, PDSO18 |
| 封裝： | PLASTIC, MS-013-AB, SOIC-18 |
| 文件頁(yè)數(shù)： | 6/11頁(yè) |
| 文件大?。?/td> | 94K |
| 代理商： | ISL83385ECB |
6
(V
CC
= 0V). The receivers’ Schmitt trigger input stage uses
hysteresis to increase noise immunity and decrease errors
due to slow input signal transitions.
Low Power Operation
This 3V device requires a nominal supply current of 0.3mA,
even at V
CC
= 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 ISL83385E in new designs.
Powerdown Functionality
The already low current requirement drops significantly
when the device enters powerdown mode. In powerdown,
supply current drops to 1
μ
A, because the on-chip charge
pump turns off (V+ collapses to V
CC
, 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
The ISL83385E may be forced into its low power, standby
state via a simple shutdown (SHDN) pin (see Figure 2).
Driving this pin high enables normal operation, while driving
it low forces the IC into it’s powerdown state. The time
required to exit powerdown, and resume transmission is less
than 100
μ
s. Connect SHDN to V
CC
if the powerdown
function isn’t needed.
Capacitor Selection
These charge pumps only require 0.1
μ
F capacitors for the
full operational voltage range. Table 3 lists other acceptable
capacitor values for various supply voltage ranges. Do not
use values smaller than those listed in Table 3. Increasing
the capacitor values (by a factor of 2) reduces ripple on the
transmitter outputs and slightly reduces power consumption.
When using minimum required capacitor values, make sure
that capacitor values do not degrade excessively with
temperature. If in doubt, use capacitors with a larger nominal
value. The capacitor’s equivalent series resistance (ESR)
usually rises at low temperatures and it influences the
amount of ripple on V+ and V-.
Power Supply Decoupling
In most circumstances a 0.1
μ
F bypass capacitor is
adequate. In applications that are particularly sensitive to
power supply noise, decouple V
CC
to ground with a
capacitor of the same value as the charge-pump capacitor C
1
.
Connect the bypass capacitor as close as possible to the IC.
Transmitter Outputs when Exiting
Powerdown
Figure 3 shows the response of two transmitter outputs
when exiting powerdown mode. As they activate, the two
transmitter outputs properly go to opposite RS-232 levels,
with no glitching, ringing, nor undesirable transients. Each
transmitter is loaded with 3k
in parallel with 2500pF. Note
that the transmitters enable only when the magnitude of the
supplies exceed approximately 3V.
R
XOUT
GND
≤
V
ROUT
≤
V
CC
5k
R
XIN
-25V
≤
V
RIN
≤
+25V
GND
V
CC
FIGURE 1. INVERTING RECEIVER CONNECTIONS
FIGURE 2. CONNECTIONS FOR MANUAL POWERDOWN
PWR
MGT
LOGIC
SHDN
CPU
I/O
ISL83385E
UART
TABLE 3. REQUIRED CAPACITOR VALUES
V
CC
(V)
C
1
(
μ
F)
C
2
, C
3
, C
4
(
μ
F)
3.0 to 3.6
0.1
0.1
4.5 to 5.5
0.047
0.33
3.0 to 5.5
0.1
0.47
TIME (20
μ
s/DIV.)
T1
T2
2V/DIV
5V/DIV
V
CC
= +3.3V
C1 - C4 = 0.1
μ
F
SHDN
FIGURE 3. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN
ISL83385E
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL83385ECB-T | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:15kV ESD Protected, +3V to +5.5V, +/-1 Microamp, 250kbps, RS-232 Transmitters/Receivers |
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| ISL83385EIA-T | 功能描述:IC 2DRVR/2RCVR RS232 3V 20-SSOP RoHS:否 類(lèi)別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:25 系列:- 類(lèi)型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:4.5 V ~ 5.5 V 安裝類(lèi)型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:16-PDIP 包裝:管件 |
| ISL83385EIAZ | 功能描述:IC 2DRVR/2RCVR RS232 3V 20-SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:發(fā)射器 驅(qū)動(dòng)器/接收器數(shù):4/0 規(guī)程:RS422，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類(lèi)型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| ISL83385EIAZ-T | 功能描述:IC 2DRVR/2RCVR RS232 3V 20-SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類(lèi)型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類(lèi)型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR) |
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