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參數(shù)資料
| 型號(hào)： | ICL3207CB-T |
| 廠(chǎng)商： | Intersil |
| 文件頁(yè)數(shù)： | 8/11頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC 5DRVR/3RCVR RS232 3V 24-SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類(lèi)型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 5/3 |
| 規(guī)程： | RS232 |
| 電源電壓： | 3 V ~ 5.5 V |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-SOIC |
| 包裝： | 帶卷 (TR) |
6
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
(VCC = 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 VCC = 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 C3 to VCC as shown
on the “Typical Operating Circuit”. Nevertheless, terminate
C3 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
s, the ICL3217 automatically
enters its powerdown state (see Figure 5). In powerdown,
supply current drops to 1
A, because the on-chip charge
pump turns off (V+ collapses to VCC, 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
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
s.
RXOUT
GND
≤ VROUT ≤ VCC
5k
RXIN
-25V
≤ VRIN ≤ +25V
GND
VCC
FIGURE 1. INVERTING RECEIVER CONNECTIONS
FIGURE 2. POWER DRAIN THROUGH POWERED DOWN
PERIPHERAL
OLD
VCC
POWERED
GND
VCC
Rx
Tx
VCC
CURRENT
FLOW
VOUT = VCC
RS-232 CHIP
DOWN
UART
SHDN = GND
TABLE 2. ICL3217 AUTOMATIC POWERDOWN OPERATION
RS-232 SIGNAL
PRESENT AT
RECEIVER
INPUT?
TRANSMITTER
OUTPUTS
RECEIVER
OUTPUTS
MODE
OF
OPERATION
YES
Active
Normal
Operation
NO
High-Z
Powerdown
Due to Auto
Powerdown
Logic
FIGURE 3. DISABLED RECEIVERS PREVENT POWER DRAIN
ICL3217
TRANSITION
DETECTOR
RX
TX
VCC
TO
VOUT = HI-Z*
WAKE-UP
LOGIC
POWERED
DOWN
UART
V-
* IN AUTOMATIC
POWERDOWN
ICL3207, ICL3217
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| ICL3207CBZ | 功能描述:RS-232接口集成電路 RS232 3V 5D/3R 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: |
| ICL3207CBZ-T | 功能描述:RS-232接口集成電路 RS232 3V 5D/3R 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: |
| ICL3207E | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:+/- 15kV ESD Protected, +3V to +5.5V, Low Power, 250kbps, RS-232 Transmitters/Receivers |
| ICL3207ECA | 功能描述:IC 5DRVR/3RCVR RS232 3V 24-SSOP RoHS:否 類(lèi)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(lèi)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(lèi)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) |
| ICL3207ECA-T | 功能描述:IC 5DRVR/3RCVR RS232 3V 24-SSOP RoHS:否 類(lèi)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(lèi)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(lèi)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) |
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