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参数资料
| 型号： | MC74LVX4245DTR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC TXRX DUAL OCT 3ST LV 24TSSOP |
| 标准包装： | 1 |
| 系列： | 74LVX |
| 逻辑类型： | 收发器，非反相 |
| 元件数： | 1 |
| 每个元件的位元数： | 8 |
| 输出电流高，低： | 12mA，12mA; 24mA，24mA |
| 电源电压： | 2.7 V ~ 3.6 V，4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP |
| 包装： | 标准包装 |
| 其它名称： | MC74LVX4245DTR2GOSDKR |
MC74LVX4245
http://onsemi.com
6
Dual Supply Octal Translating Transceiver
The 74LVX4245 is a is a dualsupply device well capable
of bidirectional signal voltage translation. This level shifting
ability provides an excellent interface between low voltage
CPU local bus and a standard 5.0 V I/O bus. The device
control inputs can be controlled by either the low voltage
CPU and core logic or a bus arbitrator with 5.0 V I/O levels.
The LVX4245 is ideal for mixed voltage applications such
as notebook computers using a 3.3 V CPU and 5.0 V
peripheral devices.
Applications:
Mixed Mode Dual Supply Interface Solutions
The LVX4245 is designed to solve 3.0 V / 5.0 V interfaces
when CMOS devices cannot tolerate I/O levels above their
applied VCC. If an I/O pin of a 3.0 V device is driven by a 5.0
V device, the PChannel transistor in the 3.0 V device will
conduct causing current flow from the I/O bus to the 3.0 V
power supply. The result may be destruction of the 3.0 V
device through latchup effects. A current limiting resistor
may be used to prevent destruction, but it causes speed
degradation and needless power dissipation.
A better solution is provided in the LVX4245. It provides
two different output levels that easily handle the dual voltage
interface. The A port is a dedicated 5.0 V port; the B port is
a dedicated 3.0 V port.
Since the LVX4245 is a ‘245 transceiver, the user may
either use it for bidirectional or unidirectional applications.
The center 20 pins are configured to match a ‘245 pinout.
This enables the user to easily replace this level shifter with
a 3.0 V ‘245 device without additional layout work or re
manufacture of the circuit board (when both buses are 3.0 V).
Figure 3. 3.3V/5V Interface Block Diagram
LVX4245
VCCB
VCCA
LVX4245
VCCB
VCCA
EISA - ISA - MCA
(5V I/O LEVELS)
LOW VOLTAGE CPU LOCAL BUS
Powering Up the LVX4245
When powering up the LVX4245, please note that if the
VCCB pin is poweredup well in advance of the VCCA pin,
several milliamps of either ICCA or ICCB current will result.
If the VCCA pin is poweredup in advance of the VCCB pin
then only nanoamps of Icc current will result. In actuality the
VCCB can be powered “slightly” before the VCCA without
the current penalty, but this “setup time” is dependent on the
powerup ramp rate of the VCC pins. With a ramp rate of
approximately 50 mV/ns (50V/
ms) a 25 ns setup time was
observed (VCCB before VCCA). With a 7.0 V/ms rate, the
setup time was about 140ns. When all is said and done, the
safest powerup strategy is to simply power VCCA before
VCCB. One more note: if the VCCB ramp rate is faster than
the VCCA ramp rate then power problems might still occur,
even if the VCCA powerup began prior to the VCCB powerup.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC74LVX4245DW | 功能描述:总线收发器 Dual Supply Octal RoHS:否 制造商:Fairchild Semiconductor 逻辑类型:CMOS 逻辑系列:74VCX 每芯片的通道数量:16 输入电平:CMOS 输出电平:CMOS 输出类型:3-State 高电平输出电流:- 24 mA 低电平输出电流:24 mA 传播延迟时间:6.2 ns 电源电压-最大:2.7 V, 3.6 V 电源电压-最小:1.65 V, 2.3 V 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-48 封装:Reel |
| MC74LVX4245DWG | 功能描述:总线收发器 Dual Supply Octal Translating RoHS:否 制造商:Fairchild Semiconductor 逻辑类型:CMOS 逻辑系列:74VCX 每芯片的通道数量:16 输入电平:CMOS 输出电平:CMOS 输出类型:3-State 高电平输出电流:- 24 mA 低电平输出电流:24 mA 传播延迟时间:6.2 ns 电源电压-最大:2.7 V, 3.6 V 电源电压-最小:1.65 V, 2.3 V 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-48 封装:Reel |
| MC74LVX4245DWR2 | 功能描述:总线收发器 Dual Supply Octal RoHS:否 制造商:Fairchild Semiconductor 逻辑类型:CMOS 逻辑系列:74VCX 每芯片的通道数量:16 输入电平:CMOS 输出电平:CMOS 输出类型:3-State 高电平输出电流:- 24 mA 低电平输出电流:24 mA 传播延迟时间:6.2 ns 电源电压-最大:2.7 V, 3.6 V 电源电压-最小:1.65 V, 2.3 V 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-48 封装:Reel |
| MC74LVX4245DWR2G | 功能描述:总线收发器 Dual Supply Octal Translating RoHS:否 制造商:Fairchild Semiconductor 逻辑类型:CMOS 逻辑系列:74VCX 每芯片的通道数量:16 输入电平:CMOS 输出电平:CMOS 输出类型:3-State 高电平输出电流:- 24 mA 低电平输出电流:24 mA 传播延迟时间:6.2 ns 电源电压-最大:2.7 V, 3.6 V 电源电压-最小:1.65 V, 2.3 V 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-48 封装:Reel |
| MC74LVX50D | 功能描述:缓冲器和线路驱动器 2-3.6V CMOS Hex RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
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