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參數(shù)資料
| 型號： | ICL3207 |
| 廠商： | Intersil Corporation |
| 英文描述： | Low Power, +3V to +5.5V, 250kbps, RS-232 Transmitters/Receivers(低功耗RS-232收發(fā)器（5發(fā)3收）) |
| 中文描述： | 低功耗，3V至5.5V，250kbps的和RS - 232發(fā)送器/接收器（低功耗的RS - 232收發(fā)器（5發(fā)3收）） |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 93K |
| 代理商： | ICL3207 |
5
ICL3217 transmitter outputs disable and assume a high
impedance state when the device enters the automatic
powerdown mode. These outputs may be driven to
±
12V
when disabled.
Both devices guarantee a 250kbps data rate for full load
conditions (3k
and 1000pF), V
CC
≥
3.0V, with one
transmitter operating at full speed. Under more typical
conditions of V
CC
≥
3.3V, R
L
= 3k
, and C
L
= 250pF, one
transmitter easily operates at 800kbps.
Transmitter inputs float if left unconnected, and may cause
I
CC
increases. Connect unused inputs to GND for the best
performance.
Receivers
The ICL32X7 each contain inverting receivers that convert
RS-232 signals to CMOS output levels and accept inputs up
to
±
25V while presenting the required 3k
to 7k
input
impedance (see Figure 1) even if the power is off
(V
CC
= 0V). The receivers’ Schmitt trigger input stage uses
hysteresis to increase noise immunity and decrease errors
due to slow input signal transitions.
Receivers on the ICL3207 are always active. The ICL3217
receivers disable when in the automatic powerdown state,
thereby eliminating the possible current path through a
shutdown peripheral’s input protection diode (see Figures 2
and 3).
Low Power Operation
These 3V devices require a nominal supply current of
0.3mA, even at V
CC
= 5.5V, during normal operation (not in
powerdown mode). This is considerably less than the 11mA
current required by comparable 5V RS-232 devices, allowing
users to reduce system power simply by replacing the old
style device with the ICL3207.
Low Power, Pin Compatible Replacement
Pin compatibility with existing 5V products (e.g., MAX207),
coupled with the wide operating supply range, make the
ICL32X7 potential lower power, higher performance drop-in
replacements for existing ‘2X7 5V applications. As long as
the
±
5V RS-232 output swings are acceptable, the ICL32X7
devices should work in most 5V applications.
When replacing a ‘207 or ‘237 device in an existing 5V
application, it is acceptable to terminate C
3
to V
CC
as shown
on the “Typical Operating Circuit”. Nevertheless, terminate
C
3
to GND if possible, as slightly better performance results
from this configuration.
Automatic Powerdown (ICL3217 Only)
Even greater power savings is available by using the
ICL3217 which features an automatic powerdown function.
When no valid RS-232 voltages (see Figure 4) are sensed
on any receiver input for 30
μ
s, the ICL3217
automatically
enters its powerdown state (see Figure 5). In powerdown,
supply current drops to 1
μ
A, because the on-chip charge
pump turns off (V+ collapses to V
CC
, V- collapses to GND),
and the receiver and transmitter outputs three-state (see
Table 2). This micro-power mode makes the ICL3217 ideal
for battery powered and portable applications. Invalid
receiver levels occur whenever the driving peripheral’s
outputs are shut off (powered down) or when the RS-232
interface cable is disconnected. The ICL3217 powers back
R
XOUT
GND
≤
V
ROUT
≤
V
CC
5k
R
XIN
-25V
≤
V
RIN
≤
+25V
GND
V
CC
FIGURE 1. INVERTING RECEIVER CONNECTIONS
FIGURE 2. POWER DRAIN THROUGH POWERED DOWN
PERIPHERAL
OLD
V
CC
POWERED
DOWN
UART
GND
SHDN = GND
V
CC
Rx
Tx
V
CC
CURRENT
FLOW
V
OUT
= V
CC
RS-232 CHIP
FIGURE 3. DISABLED RECEIVERS PREVENT POWER DRAIN
ICL3217
TRANSITION
DETECTOR
R
X
T
X
V
CC
V
CC
TO
V
OUT
= HI-Z*
WAKE-UP
LOGIC
POWERED
DOWN
UART
V-
* IN AUTOMATIC
POWERDOWN
ICL3207, ICL3217
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相關(guān)代理商/技術(shù)參數(shù) |
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| ICL3207 WAF | 制造商:Intersil Corporation 功能描述: |
| ICL3207_05 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Low Power, +3V to +5.5V, 250kbps, RS-232 Transmitters/Receivers |
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