參數(shù)資料
型號(hào)： ICL3225E
廠商： Intersil Corporation
英文描述： ±15kV ESD Protected, +3V to +5.5V, 1Microamp, 1Mbps, RS-232 Transceivers with Enhanced Automatic Powerdown(±15kV ESD 防護(hù), +3V至+5.5V, 1微安, 1Mbps, RS-232收發(fā)器，具有增強(qiáng)型自動(dòng)關(guān)斷功能)
中文描述： ± 15kV的ESD保護(hù)，3V至5.5V，1Microamp，1Mbps的，RS - 232接口的增強(qiáng)型自動(dòng)掉電（± 15kV的ESD防護(hù)，采用3V至5.5V的，1微安，1Mbps的，RS - 232接口收發(fā)器，具有增強(qiáng)型自動(dòng)關(guān)收發(fā)器斷功能）
文件頁(yè)數(shù)： 12/20頁(yè)
文件大小： 444K
代理商： ICL3225E
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
μ
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. 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.
Operation Down to 2.7V
ICL32XXE transmitter outputs meet RS-562 levels (
±
3.7V),
at full data rate, with V
CC
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
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
FORCEOFF
FIGURE 10. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN
5V/DIV
READY
FIGURE 11. TRANSMITTER OUTPUT VOLTAGE vs LOAD
CURRENT (PER TRANSMITTER, i.e., DOUBLE
CURRENT AXIS FOR TOTAL V
OUT
+ CURRENT)
T
LOAD CURRENT PER TRANSMITTER (mA)
0
2
4
6
8
10
-6
-4
-2
0
2
4
6
-5
-3
-1
1
3
5
1
3
5
7
9
V
OUT
+
V
OUT
-
V
CC
V
OUT
+
V
OUT
-
T1
T2
T3
V
CC
= 3.0V
ICL3245E
ICL3225E, ICL3227E, ICL3245E
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ICL3225E_06 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:【15kV ESD Protected, +3V to +5.5V, 1Microamp, 1Mbps, RS-232 Transceivers with Enhanced Automatic Powerdown
ICL3225ECA 功能描述:RS-232接口集成電路 3-5.5V TXRX ESD RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
ICL3225ECA-T 功能描述:IC 2DRVR/2RCVR RS232 3V 20-SSOP RoHS:否 類別: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)
ICL3225ECAZ 功能描述:RS-232接口集成電路 RS232 3V 2D/2R 15KV 1MBPS E-DWN20SSOP CM RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
ICL3225ECAZ-T 功能描述:RS-232接口集成電路 RS232 3V 2D/2R 15KV 1MBPS E-DWN20SSOP CM RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
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