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| 型号： | ISL3243EIRZ |
| 厂商： | INTERSIL CORP |
| 元件分类： | Buffer和线驱动 |
| 英文描述： | QFN Packaged, ±15kV ESD Protected, +2.7V to +3.6V, 250kbps, RS-232 Transmitters/Receivers with Separate Logic Supply Pin; Temperature Range: -40°C to 85°C; Package: 32-QFN |
| 中文描述： | LINE TRANSCEIVER, PQCC32 |
| 封装： | 5 X 5 MM, ROHS COMPLIANT, PLASTIC, QFN-32 |
| 文件页数： | 15/16页 |
| 文件大小： | 549K |
| 代理商： | ISL3243EIRZ |
8
FN6768.1
May 13, 2010
Detailed Description
The ISL324xE operate from a single +2.7V to +3.6V supply,
guarantee a 250kbps minimum data rate, require only four
small external 0.1F capacitors, feature low power
consumption, and meet all ElA RS-232 and V.28
specifications even with VCC = 3.0V. The circuit is divided
into three sections: The charge pump, the transmitters, and
the receivers.
Charge-Pump
Intersil’s new ISL324xE devices utilize regulated on-chip
dual charge pumps as voltage doublers, and voltage
inverters to generate ±5.5V transmitter supplies from a VCC
supply as low as 3.0V. This allows them to maintain RS-232
compliant output levels over the ±10% tolerance range of
3.3V powered systems. The efficient on-chip power supplies
require only four small, external 0.1F capacitors for the
voltage doubler and inverter functions. The charge pumps
operate discontinuously (i.e., they turn off as soon as the V+
and V- supplies are pumped up to the nominal values),
resulting in significant power savings.
Transmitters
The transmitters are proprietary, low dropout, inverting
drivers that translate logic input levels to EIA/TIA-232 output
levels. Coupled with the on-chip ±5.5V supplies, these
transmitters deliver true RS-232 levels over a wide range of
single supply system voltages.
All transmitter outputs disable and assume a high
impedance state when the device enters the power-down
mode (see Table 2). These outputs may be driven to
±12V
when disabled.
The devices guarantee a 250kbps data rate for full load
conditions (3k
Ω and 1000pF), V
CC ≥ 3.0V, with one
transmitter operating at full speed. Under more typical
conditions of VCC ≥ 3.3V, RL = 3kΩ, and CL = 200pF, one
transmitter easily operates at greater than 1Mbps.
The transmitter input switching threshold is set by the
voltage applied to the VL pin, so tying VL to a voltage lower
than VCC reduces the Tx input VIH and VIL to values
compatible with logic ICs (e.g., UARTs and controllers)
Transmitter inputs float if left unconnected (there are no
pull-up resistors), and may cause supply current increases.
Connect unused inputs to GND for the best performance.
Receivers
All the ISL324xE devices contain standard inverting
receivers that three-state via the EN or FORCEOFF control
lines. Additionally, these products include noninverting
“monitor” receivers (denoted by the ROUTB label) that are
always active, regardless of the state of any control lines. All
the receivers convert RS-232 signals to CMOS output levels,
swinging between GND and VL, and accept inputs up to
±25V while presenting the required 3k
Ω to 7kΩ input
impedance (see Figure 4) 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 ISL3241E inverting receivers disable only when EN is
driven high. ISL3243E receivers disable during forced
(manual) powerdown, but not during automatic powerdown
(see Table 2).
FIGURE 3A. TEST CIRCUIT
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3. RECEIVER ENABLE AND DISABLE TIMES
Test Circuits and Waveforms (Continued)
PARAMETER
RIN
SW
tPHZ and tPZH
GND
tPLZ and tPZL
VCC
VL
R
EN
RIN
VCC
SIGNAL
GENERATOR
CL
OR
FORCEOFF
ROUT
VL
GND
SW
1k
Ω
OR
GND
VL
FORCEON
OR SHDN
ROUT
VL
0V
50%
VOH
0V
50%
VOH - 0.3V
tPHZ
ROUT
VL
VOL
50%
VOL + 0.3V
tPLZ
FORCEOFF
OUTPUT HIGH
OUTPUT LOW
tPZL
tPZH
VL
0V
50%
EN
RXOUT
GND
≤ VROUT ≤ VL
5k
Ω
RXIN
-25V
≤ VRIN ≤ +25V
GND
VL
FIGURE 4.
INVERTING RECEIVER CONNECTIONS
ISL3241E, ISL3243E
相关PDF资料 |
PDF描述 |
|---|---|
| ISL3243EIRZ-T | QFN Packaged, ±15kV ESD Protected, +2.7V to +3.6V, 250kbps, RS-232 Transmitters/Receivers with Separate Logic Supply Pin; Temperature Range: -40°C to 85°C; Package: 32-QFN |
| ISL3293EFHZ-T | ±16.5kV ESD Protected, +125°C, 3.0V to 5.5V, SOT-23/TDFN Packaged, Low Power, RS-485/RS-422 Transmitters; Temperature Range: Full-Range Ind; Package: 6-SOT-23 T&R |
| ISL3293EIHZ-T | ±16.5kV ESD Protected, +125°C, 3.0V to 5.5V, SOT-23/TDFN Packaged, Low Power, RS-485/RS-422 Transmitters; Temperature Range: -40°C to 85°C; Package: 6-SOT-23 T&R |
| ISL3294EFHZ-T | ±16.5kV ESD Protected, +125°C, 3.0V to 5.5V, SOT-23/TDFN Packaged, Low Power, RS-485/RS-422 Transmitters; Temperature Range: Full-Range Ind; Package: 6-SOT-23 T&R |
| ISL3294EIHZ-T | ±16.5kV ESD Protected, +125°C, 3.0V to 5.5V, SOT-23/TDFN Packaged, Low Power, RS-485/RS-422 Transmitters; Temperature Range: -40°C to 85°C; Package: 6-SOT-23 T&R |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL3243EIRZ-T | 功能描述:IC TXRX RS232 ESD-PROT 32-QFN RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:250 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:带卷 (TR) |
| ISL32450E | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:?±60V Fault Protected, 3.3V to 5V, ?±20V Common Mode Range, RS-485/RS-422 Transceivers with Cable Invert and ?±15kV ESD |
| ISL32450EIBZ | 功能描述:IC TRANSCEIVER 14-SOIC 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) |
| ISL32450EIBZ-T | 功能描述:IC TRANSCEIVER 14-SOIC 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) |
| ISL32450EIBZ-T7A | 功能描述:RS-422/RS-485 接口 IC 60V OVP 20V CMR -40+ 85 5V RS-485 FL DUP RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
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