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參數(shù)資料
| 型號(hào)： | ICL3310IB-T |
| 廠商： | INTERSIL CORP |
| 元件分類(lèi)： | 通用總線功能 |
| 英文描述： | +3V to +5.5V, 1 Microamp, 250kbps, RS-232 Transmitter/Receiver |
| 中文描述： | DUAL LINE TRANSCEIVER, PDSO18 |
| 封裝： | PLASTIC, SOIC-18 |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大?。?/td> | 158K |
| 代理商： | ICL3310IB-T |
6
Capacitor Selection
The charge pumps require 0.1
μ
F or greater capacitors for
operation with 3.3V
≤
V
CC
≤
5.5V. 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 5 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.
High Data Rates
The ICL3310 maintain the RS-232
±
5V minimum transmitter
output voltages even at high data rates. Figure 6 details a
transmitter loopback test circuit, and Figure 7 illustrates the
loopback test result at 120kbps. For this test, all transmitters
were simultaneously driving RS-232 loads in parallel with
1000pF, at 120kbps. Figure 8 shows the loopback results for
a single transmitter driving 1000pF and an RS-232 load at
250kbps. The static transmitters were also loaded with an
RS-232 receiver.
FIGURE 4. CONNECTIONS FOR MANUAL POWERDOWN
PWR
MGT
LOGIC
SHDN
CPU
I/O
ICL3310
UART
FIGURE 6. TRANSMITTER LOOPBACK TEST CIRCUIT
TIME (20
μ
s/DIV.)
T1
T2
2V/DIV.
5V/DIV.
V
CC
= +3.3V
C1 - C4 = 0.1
μ
F
SHDN
FIGURE 5. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN
ICL3310
V
CC
C
1
C
2
C
4
+
C
3
+
+
+
1000pF
V+
V-
5k
T
IN
R
OUT
C1+
C1-
C2+
C2-
R
IN
T
OUT
+
V
CC
0.1
μ
F
V
CC
SHDN
ICL3310
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