MAX4639 Maxim, MAX4639 Datasheet - Page 9

• Manufacturer Part Number: MAX4639
• Description: The MAX4638/MAX4639 are single 8:1 and dual 4:1 CMOS analog multiplexers/demultiplexers (muxes/demuxes)
• Manufacturer: Maxim

The MAX4638/MAX4639 are low-voltage, CMOS analog
muxes. The MAX4638 is an 8:1 mux that switches one
of eight inputs (NO1–NO8) to a common output (COM)
as determined by the 3-bit binary inputs A0, A1, and
A2. The MAX4639 is a 4:1 dual mux that switches one
of four differential inputs to a common differential out-
put as determined by the 2-bit binary inputs A0 and A1.
Both the MAX4638/MAX4639 have an EN input that can
be used to enable or disable the device. When dis-
abled, all channels are switched off. See Truth Tables.
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 can cause permanent damage to the devices.
Always sequence V+ on first, then V-, followed by the
logic inputs. If power-supply sequencing is not possi-
ble, add two small-signal diodes (D1, D2) in series with
the supply pins for overvoltage protection (Figure 1).
Adding diodes reduces the analog signal range to one
diode drop below V+ and one diode drop above V-, but
does not affect the devices’ low switch resistance.
Device operation is unchanged, and the difference
between V+ and V- should not exceed 6V. These pro-
tection diodes are not recommended when using a sin-
gle supply. For single-supply operation, V- should be
connected to GND as close to the device as possible.
MAX4638 (Single 8-to-1 Mux)
A2
X
0
0
0
0
1
1
1
1
A1
X
0
0
1
1
0
0
1
1
Applications Information
_______________________________________________________________________________________
A0
X
0
1
0
1
0
1
0
1
Detailed Description
Overvoltage Protection
EN
0
1
1
1
1
1
1
1
1
Low-Voltage Analog Multiplexers
ON SWITCH
None
NO1
NO2
NO3
NO4
NO5
NO6
NO7
NO8
3.5Ω, Single 8:1 and Dual 4:1,
Figure 1. Overvoltage Protection Using External Blocking
Diodes
MAX4639 (Dual 4-to-1 Mux)
MAX4639ETE
MAX4639EUE
MAX4639ESE
MAX4639ETP
Ordering Information (continued)
COM_
A1
X
0
0
1
1
PART
A0
X
0
1
0
1
-40 C to +85 C
-40 C to +85 C
-40 C to +85 C
-40 C to +85 C
TEMP RANGE
*
*
V+
V-
EN
-2.5V
+2.5V
0
1
1
1
1
D1
D2
* INTERNAL PROTECTION DIODES
COMA
NO1A
NO2A
NO3A
NO4A
None
*
*
Truth Tables
PIN-PACKAGE
16 Thin QFN (4 4)
16 TSSOP
16 SO
20 Thin QFN (4 4)
MAX4638
MAX4639
NO_
COMB
NO1B
NO2B
NO3B
NO4B
None
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