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參數(shù)資料
| 型號(hào)： | ICL3207 |
| 廠商： | Intersil Corporation |
| 英文描述： | Low Power, +3V to +5.5V, 250kbps, RS-232 Transmitters/Receivers(低功耗RS-232收發(fā)器（5發(fā)3收）) |
| 中文描述： | 低功耗，3V至5.5V，250kbps的和RS - 232發(fā)送器/接收器（低功耗的RS - 232收發(fā)器（5發(fā)3收）） |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大?。?/td> | 93K |
| 代理商： | ICL3207 |
6
up whenever it detects a valid RS-232 voltage level on any
receiver input (such as when the RS-232 cable is
reconnected). The time to recover from automatic powerdown
mode is typically 100
μ
s.
This automatic powerdown feature provides additional
system power savings without changes to the existing
operating system or hardware.
Utilizing power management circuitry, to power down the rest
of the communication circuitry (e.g., the UART) when the
ICL3217 powers down, produces even greater power
savings. Connecting a transition detector to the V- pin (see
Figure 3) is an easy way for the power management logic to
determine when the ICL3217 enters and exits powerdown.
Capacitor Selection
The charge pumps require 0.22
μ
F capacitors for 3.3V
operation. Existing 5V applications typically utilize either
0.1
μ
F or 1
μ
F capacitors, and the ICL32X7 works well with
either value. New 5V designs should use 0.22
μ
F capacitors
for the best results. For other supply voltages refer to Table 3
for capacitor values. 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. C
2
, C
3
, and C
4
can be
increased without increasing C
1
’s value, however, do not
increase C
1
without also increasing C
2
, C
3
, and C
4
to
maintain the proper ratios (C
1
to the other capacitors).
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 6 shows the response of two ICL3217 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.
TABLE 2. ICL3217 AUTOMATIC POWERDOWN OPERATION
RS-232 SIGNAL
PRESENT AT
RECEIVER
INPUT
TRANSMITTER
OUTPUTS
RECEIVER
OUTPUTS
MODE
OF
OPERATION
YES
Active
Active
Normal
Operation
NO
High-Z
High-Z
Powerdown
Due to Auto
Powerdown
Logic
FIGURE 4. DEFINITION OF VALID RS-232 RECEIVER LEVELS
0.3V
-0.3V
-2.7V
2.7V
INVALID LEVEL - POWERDOWN OCCURS AFTER 30
μ
s
VALID RS-232 LEVEL - ICL3217 IS ACTIVE
VALID RS-232 LEVEL - ICL3217 IS ACTIVE
INDETERMINATE - POWERDOWN MAY OR
MAY NOT OCCUR
INDETERMINATE - POWERDOWN MAY OR
MAY NOT OCCUR
RECEIVER
INPUTS
TRANSMITTER
OUTPUTS
V+
V
CC
0
V-
INVALID
REGION
}
FIGURE 5. AUTOMATIC POWERDOWN TIMING DIAGRAM
AUTOPWDN
PWR UP (t
WU
)
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
0.22
0.22
4.5 to 5.5
0.1 to 1.0
0.1 to 1.0
3.0 to 5.5
0.22
0.22
ICL3207, ICL3217
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相關(guān)代理商/技術(shù)參數(shù) |
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| ICL3207 WAF | 制造商:Intersil Corporation 功能描述: |
| ICL3207_05 | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:Low Power, +3V to +5.5V, 250kbps, RS-232 Transmitters/Receivers |
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| ICL3207CA-T | 功能描述:IC 5DRVR/3RCVR RS232 3V 24-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:- 標(biāo)準(zhǔn)包裝:1,000 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-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
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