参数资料
型号: 74LCX540MTCX
厂商: Fairchild Semiconductor
文件页数: 5/14页
文件大小: 0K
描述: IC INVERTER 8-INPUT 20TSSOP
标准包装: 2,500
系列: 74LCX
逻辑类型: 逆变器,缓冲器
电路数: 1
输入数: 8
特点: 三态
电源电压: 2 V ~ 3.6 V
电流 - 静态(最大值): 10µA
输出电流高,低: 24mA,24mA
逻辑电平 - 低: 0.7 V ~ 0.8 V
逻辑电平 - 高: 1.7 V ~ 2 V
额定电压和最大 CL 时的最大传播延迟: 6.5ns @ 3.3V,50pF
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
供应商设备封装: 20-TSSOP
封装/外壳: 20-TSSOP(0.173",4.40mm 宽)
包装: 带卷 (TR)
2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAB1200 Rev 1.2.7
13
FAB
12
00
Ground
-Re
ferenc
ed
Class
-G
He
adp
hone
Ampli
fi
er
wi
th
I
n
tegrated
Buck
Co
nvert
er
I
2C Registers
Table 1. Register Map
Register
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0x01
HPENL
HPENR
0
THERM
SWSBY
0x02
MUTEL
MUTER
VOL4
VOL3
VOL2
VOL1
VOL0
0
0x03
0
HIZL
HIZR
0x04
ID
0
Revision 3
Revision 2
Revision 1
Revision 0
Notes:
4.
Bits labeled “0” have no effect if written. When read, their value is always 0.
5.
Bits not mentioned in the register map are for testing only. These bits should never be written. When read, they
may return any value.
Table 2. Register 0x01
Bit
Label
R/W
Default
Description
0
SWSBY
R/W
1
1 = Low-power software standby. Charge pumps are turned off. I
2C is
still active. Register values are not lost during shutdown.
0 = Normal operation.
1
THERM
R
0
1 = A thermal shutdown has occurred. This bit stays set until it is read.
0 = No thermal shutdown.
5:2
0
R
0000
Value is always 0. No effect if written.
6
HPENR
R/W
0
1 = Enable right headphone amplifier.
0 = Disable right headphone amplifier.
7
HPENL
R/W
0
1 = Enable left headphone amplifier.
0 = Disable left headphone amplifier.
Table 3. Register 0x02
Bit
Label
R/W
Default
Description
0
R
0
Value is always 0. No effect if written.
5:1
VOL[4:0]
R/W
00000
00000 : -59 dB
11111 : +4 dB
Audio taper over entire range (see Table 6)
6
MUTER
R/W
1
1 = Mute right channel.
0 = Un-mute right channel.
7
MUTEL
R/W
1
1 = Mute left channel.
0 = Un-mute left channel.
Table 4. Register 0x03
Bit
Label
R/W
Default
Description
0
HIZR
R/W
0
1 = 3-state right channel.
0 = Normal operation.
1
HIZL
R/W
0
1 = 3-state left channel.
0 = Normal operation.
7:2
0
R
000000
Value is always 0. No effect if written.
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