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參數(shù)資料
| 型號(hào)： | ICL3207ECB |
| 廠商： | INTERSIL CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | TRIPLE LINE TRANSCEIVER, PDSO24 |
| 封裝： | PLASTIC, MS-013AD, SOIC-24 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 329K |
| 代理商： | ICL3207ECB |
6
Receivers
The ICL32X7E 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 ICL3207E are always active. The
ICL3217E 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 ICL3207E.
Low Power, Pin Compatible Replacement
Pin compatibility with existing 5V products (e.g., MAX207E),
coupled with the wide operating supply range, make the
ICL32X7E potential lower power, higher performance drop-
in replacements for existing ‘2X7E 5V applications. As long
as the
±
5V RS-232 output swings are acceptable, the
ICL32X7E devices should work in most 5V applications.
When replacing a ‘207E or ‘237E 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 (ICL3217E Only)
Even greater power savings is available by using the
ICL3217E 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 ICL3217E
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 ICL3217E 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 ICL3217E powers back
up whenever it detects a valid RS-232 voltage level on any
receiver input (such as when the RS-232 cable is
reconnected). The time to recover from automatic
powerdown mode is typically 100
μ
s.
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
V
CC
Rx
Tx
V
CC
CURRENT
FLOW
V
OUT
=
V
CC
RS-232 CHIP
SHDN = GND
TABLE 2. ICL3217E AUTOMATIC POWERDOWN OPERATION
RS-232 SIGNAL
PRESENT AT
RECEIVER
INPUT
TRANSMITTER
OUTPUTS
RECEIVER
OUTPUTS
MODE
OF
OPERATION
YES
Active
Active
Normal
Operation
NO
High-Z
High-Z
Powerdown
Due to Auto
Powerdown
Logic
FIGURE 3. DISABLED RECEIVERS PREVENT POWER DRAIN
ICL3217E
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
ICL3207E, ICL3217E
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| ICL3207ECB-T | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICL3207ECB-T | 功能描述:IC 5DRVR/3RCVR RS232 3V 24-SOIC 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) |
| ICL3207ECBZ | 功能描述:RS-232接口集成電路 RS232 3V 5D/3R 15KV 24 COM 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: |
| ICL3207ECBZ-T | 功能描述:RS-232接口集成電路 RS232 3V 5D/3R 15KV 24 COMEL 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: |
| ICL3207ECV | 制造商:Intersil Corporation 功能描述: |
| ICL3207EIA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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