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参数资料
| 型号： | MAX4999ETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/11页 |
| 文件大小： | 0K |
| 描述： | IC MULTIPLEXER 8X1 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 多路复用器 |
| 电路： | 1 x 8:1 |
| 导通状态电阻： | 12 欧姆 |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 3.6 V |
| 电流 - 电源： | 5µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
MAX4999
USB 2.0 Hi-Speed Differential
8:1 Multiplexer
8
_______________________________________________________________________________________
Applications Information
Increasing USB Channels
The MAX4999 features an enable input that allows two
MAX4999s to be connected, allowing multiplexing
between 16 USB channels. Figure 4 shows the typical
application with a single USB common terminal multi-
plexed to eight channels (8:1). See the Eye Diagram -
Single graph in the
Typical Operating Characteristics.
Figure 5 shows two MAX4999 devices configured with
the USB common terminal multiplexed to 16 USB chan-
nels (16:1). See the Eye Diagram - Double graph in the
Typical Operating Characteristics. The MAX4999 was
designed to be symmetrical so that the two common
ports may be wired in parallel with very short wiring to
create a 16:1 configuration. When operating in 16:1 con-
figuration, interchange COM0 and COM1 on the second
device to reverse the D+ and D- pins. This minimizes
vias and crossovers (Figure 5).
USB Switching
The MAX4999 analog multiplexers are fully compliant
with the USB 2.0 specification. The low on-resistance
and low on-capacitance of the MAX4999 make it ideal
for high-performance switching applications.
Board Layout
Hi-Speed switches require proper layout and design pro-
cedures for optimum performance. Keep design-con-
trolled impedance PCB traces as short as possible.
Ensure that high-quality bypass ceramic capacitors
(X7R, X5R or better) are placed as close to the device as
possible and use large ground planes where possible.
VCC
GND
C0
EN
C1
C2
CONTROL
LOGIC
CHARGE
PUMP
MAX4999
COM1
MUX
D0 _1
D1 _1
D2 _1
D3 _1
D4 _1
D5 _1
D6 _1
D7 _1
COM0
MUX
D0 _0
D1 _0
D2 _0
D3 _0
D4 _0
D5 _0
D6 _0
D7 _0
Functional Diagram/Truth Table
X = DON’T CARE
MAX4999
EN
C2
C1
C0
FUNCTION
1
0
COM_
→D0_ _
1
0
1
COM_
→D1_ _
1
0
1
0
COM_
→D2_ _
1
0
1
COM_
→D3_ _
1
0
COM_
→D4_ _
1
0
1
COM_
→D5_ _
1
0
COM_
→D6_ _
1
COM_
→D7_ _
0X
X
STANDBY MODE.
ALL SWITCHES IN HIGH-
IMPEDANCE STATE.
CHARGE PUMP IS OFF.
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