參數資料
| 型號： | 74LCX540WMX |
| 廠商： | Fairchild Semiconductor |
| 文件頁數： | 5/14頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC INVERTER 8-INPUT 20SOIC |
| 標準包裝： | 1,000 |
| 系列： | 74LCX |
| 邏輯類型： | 逆變器，緩沖器 |
| 電路數： | 1 |
| 輸入數： | 8 |
| 特點： | 三態(tài) |
| 電源電壓： | 2 V ~ 3.6 V |
| 電流 - 靜態(tài)（最大值）： | 10µA |
| 輸出電流高，低： | 24mA，24mA |
| 邏輯電平 - 低： | 0.7 V ~ 0.8 V |
| 邏輯電平 - 高： | 1.7 V ~ 2 V |
| 額定電壓和最大 CL 時的最大傳播延遲： | 6.5ns @ 3.3V，50pF |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 供應商設備封裝： | 20-SOIC |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 包裝： | 帶卷 (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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