参数资料
| 型号： | ISL4238EIR-T |
| 厂商： | Intersil |
| 文件页数： | 17/17页 |
| 文件大小： | 0K |
| 描述： | IC 5DRVR/3RCVR RS232 3V 32-QFN |
| 标准包装： | 6,000 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 5/3 |
| 规程： | RS232 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 带卷 (TR) |
9
FN8038.5
May 13, 2010
GND for the best performance. ISL4238E transmitter inputs
incorporate an active positive feedback resistor that
maintains the last input state in the absence of a forcing
signal, so unused transmitter inputs may be left
unconnected.
Receivers
ISL4238E, ISL4244E, ISL4245 devices contain standard
inverting receivers which can tristate via the FORCEOFF
control line. Additionally, they include a noninverting
(monitor) receiver (denoted by the ROUTB label) that is
always active, regardless of the state of any control lines.
Both receiver types convert RS-232 signals to CMOS output
levels and accept inputs up to ±25V while presenting the
required 3k
Ω to 7kΩ 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.
The ISL4238E, ISL4244E, ISL4245 inverting receivers
disable during forced (manual) power-down, but not during
automatic power-down (see Table 2). Conversely, the
monitor receiver remains active even during manual power-
down making it extremely useful for Ring Indicator
monitoring. Standard receivers driving powered down
peripherals must be disabled to prevent current flow through
renders them useless for wake up functions, but the
corresponding monitor receiver can be dedicated to this task
as shown in Figure 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
power-down mode). This is considerably less than the 5mA
to 11mA current required by comparable 5V RS-232 devices,
allowing users to reduce system power simply by switching
to this new family.
TABLE 2. POWER-DOWN LOGIC TRUTH TABLE
RCVR OR
XMTR
EDGE
WITHIN 30
SEC?
FORCEOFF
INPUT
FORCEON
INPUT
TRANSMITTER
OUTPUTS
RECEIVER
OUTPUTS
ROUTB
OUTPUTS
RS-232
LEVEL
PRESENT
AT
RECEIVER
INPUT?
INVALID
OUTPUT
MODE OF OPERATION
NO
H
Active
No
L
Normal Operation (Enhanced
Auto Power-down Disabled)
NO
H
Active
Yes
H
YES
H
L
Active
No
L
Normal Operation (Enhanced
Auto Power-down Enabled)
YES
H
L
Active
Yes
H
NO
H
L
High-Z
Active
No
L
Power-down Due to Enhanced
Auto Power-down Logic
NO
H
L
High-Z
Active
Yes
H
X
L
X
High-Z
Active
No
L
Manual Power-down
X
L
X
High-Z
Active
Yes
H
INVALID DRIVING FORCEON AND FORCEOFF (EMULATES AUTOMATIC POWER-DOWN)
X
Note 8
Active
Yes
H
Normal Operation
X
Note 8
High-Z
Active
No
L
Forced Auto Power-down
NOTE:
8. Input is connected to INVALID Output.
RXOUT
GND
≤ VROUT ≤ VCC
5k
Ω
RXIN
-25V
≤ VRIN ≤ +25V
GND
VCC
FIGURE 1. INVERTING RECEIVER CONNECTIONS
FIGURE 2. POWER DRAIN THROUGH POWERED DOWN
PERIPHERAL
OLD
VCC
POWERED
GND
SHDN = GND
VCC
Rx
Tx
VCC
CURRENT
VOUT = VCC
FLOW
RS-232 CHIP
DOWN
UART
ISL4238E, ISL4244E, ISL4245E
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| ISL4238EIRZ | 功能描述:IC 5DRVR/3RCVR RS232 3V 32-QFN RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:发射器 驱动器/接收器数:4/0 规程:RS422，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| ISL4238EIRZ-T | 功能描述:IC XMITTER/RCVR ESD RS232 32-QFN RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:发射器 驱动器/接收器数:4/0 规程:RS422，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| ISL4241E | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:QFN Packaged, +/-15kV ESD Protected, +2.7V to +5.5V, 10Nanoamp, 250kbps, RS-232 Transmitters/Receivers |
| ISL4241EIR | 功能描述:IC 3DRVR/5RCVR RS232 3V 32-QFN RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:25 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:4.5 V ~ 5.5 V 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 供应商设备封装:16-PDIP 包装:管件 |
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