MAX391 Maxim, MAX391 Datasheet - Page 7

• Manufacturer Part Number: MAX391
• Description: The MAX391/MAX392/MAX393 are precision, quad, single-pole/single-throw (SPST) analog switches designed to operate at +3V, +5V, or ±5V
• Manufacturer: Maxim

Proper power-supply sequencing is recommended for
all CMOS devices. Do not exceed the absolute maxi-
mum ratings, because stresses beyond the listed rat-
ings may cause permanent damage to the devices.
Always sequence V+ on first, followed by V-, and then
logic inputs. If power-supply sequencing is not possi-
ble, add two small signal diodes in series with supply
pins for overvoltage protection (Figure 1). Adding
diodes reduces the analog signal range to 1V below V+
and 1V below V-, but low switch resistance and low
leakage characteristics are unaffected. Device opera-
tion is unchanged, and the difference between V+ and
V- should not exceed 17V.
______________________________________________________________Pin Description
__________Applications Information
DIP/SO/TSSOP
2, 15, 10, 7
3, 14, 11, 6
1, 16, 9, 8
12
13
—
4
5
PIN
_______________________________________________________________________________________
Precision, Quad, SPST Analog Switches
15, 14, 7, 6
16, 13, 8, 5
1, 12, 9, 4
QFN
EP
10
11
2
3
Overvoltage Protection
COM1–COM
NO1–NO4
NC1–NC4
IN1–IN4
NAME
GND
N.C.
V+
EP
or
V-
Inputs
Analog Switch Common Terminal
Switch Inputs
Negative-Supply Voltage Input
Ground
No Connection. Not internally connected
Positive-Supply Voltage Input—connected to substrate
Exposed Pad. Connect to V+.
Figure 1. Overvoltage Protection Using Two External Blocking
Diodes
V g
FUNCTION
NO
POSITIVE SUPPLY
NEGATIVE SUPPLY
V-
V+
COM
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