参数资料
| 型号： | ICL3217EIBZ-T |
| 厂商： | Intersil |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC 5DRVR/3RCVR RS232 3V 24-SOIC |
| 标准包装： | 1,000 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 5/3 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC |
| 包装： | 带卷 (TR) |
7
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 ICL3217E 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 ICL3217E enters and exits powerdown.
Capacitor Selection
The charge pumps require 0.1
F, or greater, capacitors for
3.3V operation. With 0.1
F capacitors, five percent tolerance
supplies (e.g., 3.14V minimum) deliver greater than
±5V
transmitter swings at full data rate, while ten percent
tolerance supplies (e.g., 2.97V minimum) deliver
±4.95V
transmitter swings. If greater than
±5V transmitter swings
are required with a 10% tolerance 3.3V supply, 0.22
F
capacitors are recommended (see Table 3). Existing 5V
applications typically utilize either 0.1
F or 1F capacitors,
and the ICL32X7E works well with either value. New 5V
designs should use 0.22
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 two)
reduces ripple on the transmitter outputs and slightly
reduces power consumption. C2, C3, and C4 can be
increased without increasing C1’s value, however, do not
increase C1 without also increasing C2, C3, and C4 to
maintain the proper ratios (C1 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
F bypass capacitor is
adequate. In applications that are particularly sensitive to
power supply noise, decouple VCC to ground with a
capacitor of the same value as the charge-pump capacitor C1.
Connect the bypass capacitor as close as possible to the IC.
Transmitter Outputs when Exiting
Powerdown
Figure 6 shows the response of two ICL3217E 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.
.
FIGURE 4. DEFINITION OF VALID RS-232 RECEIVER
LEVELS
0.3V
-0.3V
-2.7V
2.7V
INVALID LEVEL - POWERDOWN OCCURS AFTER 30
s
VALID RS-232 LEVEL - ICL3217E IS ACTIVE
INDETERMINATE - POWERDOWN MAY OR
MAY NOT OCCUR
INDETERMINATE - POWERDOWN MAY OR
MAY NOT OCCUR
RECEIVER
INPUTS
TRANSMITTER
OUTPUTS
V+
VCC
0
V-
INVALID
REGION
}
FIGURE 5. AUTOMATIC POWERDOWN TIMING DIAGRAM
AUTOPWDN
PWR UP (tWU)
TABLE 3. REQUIRED CAPACITOR VALUES
VCC (V)
C1 (F)
C2, C3, C4 (F)
3.15 to 3.6
0.1
3.0 to 3.6
0.22
4.5 to 5.5
0.1 to 1.0
3.0 to 5.5
0.22
TIME (20
s/DIV.)
T1
T2
2V/DIV
5V/DIV
VCC = +3.3V
C1 - C4 = 0.1
F
RXIN
FIGURE 6. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN (ICL3217E ONLY)
ICL3207E, ICL3217E
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相关代理商/技术参数 |
参数描述 |
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| ICL3217EIP | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ICL3217IA | 功能描述:IC 5DRVR/3RCVR RS232 3V 24-SSOP RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1,000 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| ICL3217IA-T | 功能描述:IC 5DRVR/3RCVR RS232 3V 24-SSOP RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1,000 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| ICL3217IAZ | 功能描述:RS-232接口集成电路 RS232 3V 5D/3R AUTODWN 24SSOP IND RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| ICL3217IAZ-T | 功能描述:RS-232接口集成电路 RS232 3V 5D/3R AUTODWN 24SSOP INDEL RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
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