Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Configuration | 4 channels, 2:1 SPDT with common SEL |
| Supply | 1.5 V to 5.5 V |
| Bandwidth | 2 GHz stated feature |
| On-Capacitance | 7.5 pF stated feature |
| On-Resistance | 2 Ω stated feature |
| Powered-Off Protection | Up to 3.6 V signal path at VDD=0 |
| Logic | 1.8 V compatible; fail-safe with pulldowns |
| Exact Package / Packing | TSSOP (PW), 16 pins; 2000-piece large tape and reel |
Product Overview
TMUX1574PWR is a four-lane 2:1 switch for selecting between two parallel groups of signals. One SEL control changes all four channels together, which matches use cases such as switching an SPI/JTAG/UART bus between two target devices.
Powered-off protection and fail-safe logic help isolate inactive/unpowered subsystems without back-powering the switch supply. This is valuable for shared debug/programming buses and removable/partitioned modules.
Unlike four independent SPST TMUX1511 channels, TMUX1574’s lanes form a synchronized bus multiplexer. Choosing between them is an architecture decision, not simply a channel-count comparison.
For related devices, see HKEQGOO’s Analog Switches & Multiplexers category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | TMUX1574PWR |
| Configuration | 4 channels, 2:1 SPDT with common SEL |
| Supply | 1.5 V to 5.5 V |
| Bandwidth | 2 GHz stated feature |
| On-Capacitance | 7.5 pF stated feature |
| On-Resistance | 2 Ω stated feature |
| Powered-Off Protection | Up to 3.6 V signal path at VDD=0 |
| Logic | 1.8 V compatible; fail-safe with pulldowns |
| Exact Package / Packing | TSSOP (PW), 16 pins; 2000-piece large tape and reel |
| Manufacturer Status | Active / Production |
| Part Marking | MUX1574 |
Functional Highlights
Common selection keeps multi-wire buses aligned
All four signals change destination together, preventing firmware/control skew between clock/data/chip-select paths that could occur with independently controlled switches.
2 GHz bandwidth is generous for many digital buses but board parasitics still matter
Fast edges interact with the switch/trace capacitance and stubs to the unselected device. Layout should minimize branch length even when nominal bus frequency is much lower than 2 GHz.
Design Considerations
- Keep the unselected branch short to reduce stub capacitance/reflections.
- Define SEL/EN default states during processor reset so a debug/programming bus does not connect to the wrong target.
- Verify powered-off voltage limits for both destination devices, including their own clamp paths.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists TMUX1574PWR as Active / Production; TSSOP (PW), 16 pins; 2000-piece large tape and reel; Level-1-260C-UNLIM; −40°C to +125°C; marking MUX1574.
Related Engineering Resources
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