參數(shù)資料
型號(hào)： ICL3226E
廠商： Intersil Corporation
英文描述： ±15kV ESD Protected, +3V to +5.5V, 1Microamp, 250kbps, RS-232 Transceivers with Enhanced Automatic Powerdown(±15kV ESD 防護(hù), +3V至+5.5V, 1微安, 250kbps, 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，250kbps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，250kbps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?。?/td> 390K
代理商： ICL3226E
12
another computer via a detachable cable. Detaching the
cable allows the internal receiver pull-down resistors to pull
the inputs to GND (an invalid RS-232 level), causing the
30
μ
s timer to time-out and drive the IC into powerdown.
Reconnecting the cable restores valid levels, causing the IC
to power back up.
Hybrid Automatic Powerdown Options
For devices which communicate only through a detachable
cable, connecting INVALID to FORCEOFF (with
FORCEON = 0) may be a desirable configuration. While the
cable is attached INVALID and FORCEOFF remain high, so
the enhanced automatic powerdown logic powers down the
RS-232 device whenever there is 30 seconds of inactivity on
the receiver and transmitter inputs. Detaching the cable
allows the receiver inputs to drop to an invalid level (GND),
so INVALID switches low and forces the RS-232 device to
power down. The ICL32XXE remains powered down until
the cable is reconnected (INVALID = FORCEOFF = 1) and a
transition occurs on a receiver or transmitter input (see
Figure 7). For immediate power up when the cable is
reattached, connect FORCEON to FORCEOFF through a
network similar to that shown in Figure 5.
Ready Output (ICL3224E and ICL3226E 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).
RECEIVER
INPUTS
TRANSMITTER
OUTPUTS
INVALID
OUTPUT
V+
V
CC
0
V-
t
INVL
t
INVH
FIGURE 8. ENHANCED AUTOMATIC POWERDOWN, INVALID AND READY TIMING DIAGRAMS
READY
OUTPUT
TRANSMITTER
INPUTS
t
WU
t
AUTOPWDN
t
AUTOPWDN
t
WU
INVALID
REGION
}
FIGURE 9. CONNECTIONS FOR AUTOMATIC POWERDOWN
WHEN NO VALID RECEIVER SIGNALS ARE
PRESENT
F
I
CPU
I/O
F
ICL32XXE
UART
ICL3224E, ICL3226E, ICL3244E
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