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| 型号： | ICL3227EIAZA |
| 厂商： | Intersil |
| 文件页数： | 4/20页 |
| 文件大小： | 0K |
| 描述： | IC TXRX SGL RS232 3-5.5V 16SSOP |
| 标准包装： | 77 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 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-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 1240 (CN2011-ZH PDF) |
12
FN4900.9
February 27, 2006
Ready Output (ICL3225E and ICL3227E Only)
The Ready output indicates that the ICL322XE is ready to
transmit. Ready switches low whenever the device enters
powerdown, and switches back high during power-up when
V- reaches -4V or lower.
Capacitor Selection
The charge pumps require 0.1
F capacitors for 3.3V
operation. 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. 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.
Operation Down to 2.7V
ICL32XXE transmitter outputs meet RS-562 levels (±3.7V),
at full data rate, with VCC as low as 2.7V. RS-562 levels
typically ensure inter operability with RS-232 devices.
Transmitter Outputs when Exiting
Powerdown
Figure 10 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.
Mouse Driveability
The ICL3245E is specifically designed to power a serial mouse
while operating from low voltage supplies. Figure 11 shows the
transmitter output voltages under increasing load current. The
on-chip switching regulator ensures the transmitters will supply
at least ±5V during worst case conditions (15mA for paralleled
V+ transmitters, 7.3mA for single V- transmitter).
High Data Rates
The ICL32XXE maintain the RS-232 ±5V minimum
transmitter output voltages even at high data rates. Figure
12 details a transmitter loopback test circuit, and Figure 13
illustrates the loopback test result at 250kbps. For this test,
all transmitters were simultaneously driving RS-232 loads in
parallel with 1000pF, at 250kbps. Figure 14 shows the
loopback results for a single transmitter driving 250pF and
TABLE 3. REQUIRED CAPACITOR VALUES
VCC (V)
C1 (F)
C2, C3, C4 (F)
3.0 to 3.6
0.1
4.5 to 5.5
0.047
0.33
3.0 to 5.5
0.1
0.47
TIME (20
s/DIV.)
T1
T2
2V/DIV
5V/DIV
VCC = +3.3V
FORCEOFF
FIGURE 10. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN
C1 - C4 = 0.1
F
5V/DIV
READY
FIGURE 11. TRANSMITTER OUTPUT VOLTAGE vs LOAD
CURRENT (PER TRANSMITTER, i.e., DOUBLE
CURRENT AXIS FOR TOTAL VOUT+ CURRENT)
TRANSMIT
T
E
R
OU
TP
U
T
V
O
L
T
A
G
E
(V
)
LOAD CURRENT PER TRANSMITTER (mA)
02
468
10
-6
-4
-2
0
2
4
6
-5
-3
-1
1
3
5
13579
VOUT+
VOUT -
VCC
VOUT+
VOUT -
T1
T2
T3
VCC = 3.0V
ICL3245E
ICL3225E, ICL3227E, ICL3245E
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相关代理商/技术参数 |
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| ICL3227EIAZA-T | 功能描述:RS-232接口集成电路 W/ANNEAL RS232 3V 1D /1R 15KV 1MBPS E-DWN 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: |
| ICL3227IA | 制造商:Rochester Electronics LLC 功能描述:RS232 3V 1D/1R 1MBPS E-DWN 16SSOP IND - Bulk |
| ICL322R023-01 | 制造商:HONEYWELL FENWAL ELECTRONICS 功能描述:IN-RUSH CURRENT LIMITORS (ICL'S) |
| ICL3232 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:1 Microamp Supply-Current, +3V to +5.5V, 250kbps, RS-232 Transmitters/Receivers |
| ICL3232CA | 功能描述:IC 2DRVR/2RCVR RS232 3V 16-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) |
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