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參數(shù)資料
| 型號： | MAX317 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Precision, CMOS Analog Switches(接通電阻45Ω,漏電流0.25nA,導(dǎo)通速率175ns,雙電源,單刀單擲CMOS模擬開關(guān)) |
| 中文描述： | 高精度、SPST、CMOS模擬開關(guān) |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 130K |
| 代理商： | MAX317 |
M
Prec ision, CMOS Analog S witc hes
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_______________________________________________________________________________________
PIN
NAME
FUNCTION
MAX317
1
MAX318
1
MAX319
1
COM
Analog-switch common terminal
2
2
—
N.C.
No connect — not internally connected
—
—
8
NO
Analog-switch normally open terminal
3
3
3
GND
Logic ground
4
4
4
V+
Analog-signal positive supply input
5
5
5
VL
Logic-level positive supply input
6
6
6
IN
Logic-level input
7
7
7
V-
Analog-signal negative supply input
8
—
2
NC
Analog-switch normally closed terminal
—
8
—
NO
Analog-switch normally open terminal
_______________________________________________________________________Pin Desc ription
__________Applic ations Information
Operation with S upply V oltages
Other T han ±15V
The main limitation of supply voltages other than ±15V
is analog signal range reduction. The MAX317/
MAX318/MAX319 switches operate with bipolar sup-
plies of ±5V to ±20V. Typical Operating Characteristics
graphs show typical on resistance for ±15V, ±10V, and
±5V supplies. Switching times increase by a factor of
two or more for operation at ±5V. The
MAX317/MAX318/MAX319 can operate from unipolar
supplies of +10V to +30V. Both parts can also operate
from unbalanced supplies such as +24V and -5V.
Connect V- to 0V when operating with a single supply.
This means that VL must be connected to +5V to be
TTL compatible, or to V+ for CMOS logic input levels.
Overvoltage Protec tion
Proper power-supply sequencing is recommended for
all CMOS devices. It is important not to exceed the
absolute maximum ratings because stresses beyond
the listed ratings may cause permanent damage to the
devices. Always sequence V+ on first, followed by VL,
V-, and logic inputs. If power-supply sequencing is not
possible, protect the devices from overvoltage by
adding two small signal diodes in series with the sup-
ply pins (Figure 1). Adding the diodes reduces the
analog signal range to 1V below V+ and 1V below V-,
but low switch resistance and low leakage characteris-
tics are unaffected. Device operation is unchanged,
and the difference between V+ to V- should not exceed
+44V.
V+
COM_
V-
NO_
Vg
V+
V-
Figure 1. Overvoltage Protection Using Blocking Diodes
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