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IH6208 参数 Datasheet PDF下载

IH6208图片预览
型号: IH6208
PDF下载: 下载PDF文件 查看货源
内容描述: 8通道CMOS模拟多路复用器 [8-Channel CMOS Analog Multiplexer]
分类和应用: 复用器
文件页数/大小: 7 页 / 65 K
品牌: HARRIS [ HARRIS CORPORATION ]
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IH6208  
Switching Information (Continued)  
+15V  
+3V  
50%  
t
V
A
S
S
1b  
2b  
-2V  
+0.8V  
SWITCH  
A
A
1
THRU  
OUTPUT  
S
3b  
V
OUT  
0
t
IH6208  
OPEN  
OPEN  
(SEE PINOUT)  
0
V
A
S
+5V  
EN  
4b  
0.9V  
O
V
D
OUT  
35pF  
2
200Ω  
V
O
GND  
V
S
-15V  
FIGURE 2. t  
(BREAK-BEFORE-MAKE) SWITCHING TEST CIRCUIT AND WAVEFORMS  
OPEN  
+5V  
50%  
+15V  
V
EN  
+0.8V  
t and t 100ns  
S
r
f
-5V  
1b  
t
t
EN(ON)  
EN(OFF)  
A
A
ALL  
OTHERS  
1
0V  
0.1V  
0
O
IH6208  
SWITCH  
OUTPUT  
S
EN  
4b  
V
OUT  
(SEE FIGURE 1)  
V
D
V
OUT  
2
EN  
200Ω  
35pF  
0.9V  
O
GND  
V
-15V  
O
-5V  
FIGURE 3. t  
ON  
AND t  
SWITCHING TEST CIRCUIT AND WAVEFORMS  
OFF  
IH6208 Application Information  
ENABLE Input Strobing Levels  
Using the IH6208 with Supplies Other Than ±15V  
The ENABLE input on the IH6208 requires a minimum of The IH6208 can be used with power supplies ranging from  
+4.5V to trigger to the “1” state and a maximum of +0.8V to ±6V to ±16V. The switch r will increase as the supply  
DS(ON)  
trigger to the “0” state. If the ENABLE input is being driven voltages decrease, however, the multiplexer error term (the  
from TTL logic, a pull-up resistor of 1kto 3kis required product of leakage times r ) will remain approximately  
DS(ON)  
from the gate output to +5V supply. (See Figure 4)  
constant since leakage decreases as the supply voltages  
are reduced.  
When the EN in put is driven from CMOS logic, no pullup is  
necessary, see Figure 5.  
Caution must be taken to ensure that the enable (EN)  
voltage is at least 0.7V below V+ at all times. If this is not  
done, the Address input strobing levels will not function  
properly. This may be achieved quite simply by connecting  
EN (pin 2) to V+ (pin 14) via a silicon diode as shown in  
Figure 6. When using this type of configuration, a further  
requirement must be met: the strobe levels of A0 and A1  
must be within 2.5V of the EN voltage in order to define a  
binary “1” state. For the case shown in Figure 6 the EN  
voltage is 11.3V which means that logic high at A0 and A1 is  
+8.8V (logic low continues to be 0.8V). In this configuration  
the IH6208 cannot be driven by TTL (+5V) or CMOS (+5V)  
logic. It can be driven by TTL open collector logic or CMOS  
logic with +12V supplies.  
The supply voltage of the CD4009 affects the switching  
speed of the IH6208; the same is true for TTL supply voltage  
levels. The following chart shows the effect, on t  
supply varying from +4.5V to +5.5V.  
for a  
trans  
CMOS OR TTL  
SUPPLY VOLTAGE  
TYPICAL T  
TRANS  
o
AT 25 C  
400ns  
300ns  
250ns  
200ns  
175ns  
+4.5V  
+4.75V  
+5.00V  
+5.25V  
+5.50V  
The throughput rate can therefore be maximized by using a  
+5V to +5.5V supply for the ENABLE Strobe Logic.  
If the logic and the IH6208 have common supplies, the EN  
pin should again be connected to the supply through a  
The examples shown in Figure 4 and 5 deal with ENABLE silicon diode. In this case, tying EN to the logic supply  
strobing when expansion to more than eight channels is directly will not work since it violates the 0.7V differential  
required. In these cases the EN terminal acts as a fourth voltage required between V+ and EN, (See Figure 7). A 1µF  
address input. If eight channels or less are being capacitor can be placed across the diode to minimize  
multiplexed, the EN terminal can be directly connected to switching glitches.  
+5V logic supply to enable the IH6208 at all times.  
12-132