参数资料
型号: ICS8543BGLFT
厂商: IDT, Integrated Device Technology Inc
文件页数: 2/18页
文件大小: 0K
描述: IC CLOCK BUFFER MUX 2:4 20-TSSOP
标准包装: 2,500
系列: HiPerClockS™
类型: 扇出缓冲器(分配),多路复用器
电路数: 1
比率 - 输入:输出: 2:4
差分 - 输入:输出: 是/是
输入: CML,HCSL,LVDS,LVHSTL,LVPECL,SSTL
输出: LVDS
频率 - 最大: 800MHz
电源电压: 3.135 V ~ 3.465 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 20-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 20-TSSOP
包装: 带卷 (TR)
其它名称: 8543BGLFT
ICS8543 Data Sheet
LOW SKEW, 1-to-4, DIFFERENTIAL-TO-LVDS FANOUT BUFFER
ICS8543BG REVISION E DECEMBER 17, 2010
10
2010 Integrated Device Technology, Inc.
Parameter Measurement Information, continued
Output Short Circuit Current Setup
Power Off Leakage Setup
Applications Information
Wiring the Differential Input to Accept Single-Ended Levels
Figure 2 shows how a differential input can be wired to accept single
ended levels. The reference voltage VREF = VCC/2 is generated by
the bias resistors R1 and R2. The bypass capacitor (C1) is used to
help filter noise on the DC bias. This bias circuit should be located as
close to the input pin as possible. The ratio of R1 and R2 might need
to be adjusted to position the VREF in the center of the input voltage
swing. For example, if the input clock swing is 2.5V and VDD = 3.3V,
R1 and R2 value should be adjusted to set VREF at 1.25V. The values
below are for when both the single ended swing and VDD are at the
same voltage. This configuration requires that the sum of the output
impedance of the driver (Ro) and the series resistance (Rs) equals
the transmission line impedance. In addition, matched termination at
the input will attenuate the signal in half. This can be done in one of
two ways. First, R3 and R4 in parallel should equal the transmission
line impedance. For most 50
applications, R3 and R4 can be 100.
The values of the resistors can be increased to reduce the loading for
slower and weaker LVCMOS driver. When using single-ended
signaling, the noise rejection benefits of differential signaling are
reduced. Even though the differential input can handle full rail
LVCMOS signaling, it is recommended that the amplitude be
reduced. The datasheet specifies a lower differential amplitude,
however this only applies to differential signals. For single-ended
applications, the swing can be larger, however VIL cannot be less
than -0.3V and VIH cannot be more than VDD + 0.3V. Though some
of the recommended components might not be used, the pads
should be placed in the layout. They can be utilized for debugging
purposes. The datasheet specifications are characterized and
guaranteed by using a differential signal.
Figure 1. Recommended Schematic for Wiring a Differential Input to Accept Single-ended Levels
out
LVDS
DC Input
IOS
IOSB
V
DD
out
LVDS
I
OFF
V
DD
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