TMUX7208M 44V, Latch-Up Immune, 8:1, 1-Channel Precision Multiplexers
with 1.8V Logic

1 Features

Latch-up immune
Dual supply range: ±4.5V to ±22V
Single supply range: 4.5V to 44V
–55°C to +125°C operating temperature
Low on-resistance: 4Ω
Low charge injection: 3pC
High current support: 300mA (maximum)
1.8 V logic compatible inputs
Integrated pull-down resistor on logic pins
Fail-safe logic
Rail-to-rail operation
Bidirectional signal path
Break-before-make switching

2 Applications

3 Description

The TMUX7208M is a precision 8:1, single channel multiplexer featuring low on resistance and charge injection. The devices work with a single supply (4.5V to 44V), dual supplies (±4.5V to ±22V), or asymmetric supplies (such as V_DD = 12 V, V_SS = –5V). The TMUX7208M support bidirectional analog and digital signals on the source (Sx) and drain (D) pins ranging from V_SS to V_DD.

The TMUX7208M is part of the precision switches and multiplexers family of devices and have very low on and off leakage currents allowing them to be used in high precision measurement applications. The TMUX72xx family provides latch-up immunity, preventing undesirable high current events between parasitic structures within the device typically caused by overvoltage events. A latch-up condition typically continues until the power supply rails are turned off and can lead to device failure. The latch-up immunity feature allows the TMUX72xx family of switches and multiplexers to be used in harsh environments. Additionally, the TMUX7208M is rated for extended temperature use down to –55°C, making it ideal for harsh industrial and aerospace applications.

Package Information

PART NUMBER	PACKAGE⁽²⁾	PACKAGE SIZE⁽³⁾
TMUX7208M	PW (TSSOP, 16)	5mm × 6.4mm

(2) For more information, see Section 12

(3) The package size (length × width) is a nominal value and includes pins, where applicable.

Simplified Block Diagram

4 Device Comparison Table

PRODUCT	DESCRIPTION
TMUX7208M	Low-Leakage-Current, Precision, 8:1, 1-Ch. multiplexer

5 Pin Configuration and Functions

Figure 5-1 TMUX7208M: PW Package, 16-Pin TSSOP (Top View)

Table 5-1 TMUX7208M Pin Functions

PIN			TYPE⁽¹⁾	DESCRIPTION⁽²⁾
NAME	PW	RUM	TYPE⁽¹⁾	DESCRIPTION⁽²⁾
A0	1	15	I	Logic control input, has internal 4MΩ pull-down resistor. Controls the switch configuration as shown in Section 8.5.
A1	16	14	I	Logic control input, has internal 4MΩ pull-down resistor. Controls the switch configuration as shown in Section 8.5.
A2	15	13	I	Logic control input, has internal 4MΩ pull-down resistor. Controls the switch configuration as shown in Section 8.5.
D	8	6	I/O	Drain pin. Can be an input or output.
EN	2	16	I	Active high logic enable, has internal 4MΩ pull-down resistor. When this pin is low, all switches are turned off. When this pin is high, the Ax logic input determines which switch is turned on.
GND	14	12	P	Ground (0V) reference.
S1	4	2	I/O	Source pin 1. Can be an input or output.
S2	5	3	I/O	Source pin 2. Can be an input or output.
S3	6	4	I/O	Source pin 3. Can be an input or output.
S4	7	5	I/O	Source pin 4. Can be an input or output.
S5	12	10	I/O	Source pin 5. Can be an input or output.
S6	11	9	I/O	Source pin 6. Can be an input or output.
S7	10	8	I/O	Source pin 7. Can be an input or output.
S8	9	7	I/O	Source pin 8. Can be an input or output.
VDD	13	11	P	Positive power supply. This pin is the most positive power-supply potential. For reliable operation, connect a decoupling capacitor ranging from 0.1μF to 10μF between V_DD and GND.
VSS	3	1	P	Negative power supply. This pin is the most negative power-supply potential. In single-supply applications, this pin can be connected to ground. For reliable operation, connect a decoupling capacitor ranging from 0.1μF to 10μF between V_SS and GND.
Thermal Pad			—	The thermal pad is not connected internally. No requirement to solder this pad, if connected it is recommended that the pad be left floating or tied to GND.

(1) I = input, O = output, I/O = input and output, P = power.

(2) Refer to Section 8.4 for what to do with unused pins.