Other Parts Discussed in Thread: SN74AUC04, SN74AUC08, SN74AXC1T45, SN74AUC2G240, LMK1C1103, SN74LVC257A-Q1, SN74ALVC04
Tool/software:
Hi,
My design uses a mix of LVCMOS components. I have chosen these components for a reason: rise/fall time.
I am re-evaluating my component selection and looking for lower power alternatives. I need to do this as my design will be used inside a vacuum system. I have implement power gating on the board, so, I can selectively turn things off. However, most of these components have a max Icc rating of 100mA. I don't think any of my loads will cause this much current consumption, but, I wanted a second opinion.
The table below shows my chosen components, their respective loads, fmax and transmission line lengths on the PCB.
| Component | Description | Vcc (V) | fmax (MHz) | Load | Driving distance on layout | Comment |
| SN74AUC34 | IC BUFFER NON-INVERT 2.7V 14VQFN | 1.8 | 150 | PCB Transmission line (50Ohm) and off-board electronics | 4" to SMA and longer for off-board electronics | Chosen for rise/fall time |
| LMK1C110x | Clock Buffer 2-channel output LVCMOS 1.8-V buffer 8-TSSOP -40 to 125 | 1.8 | 15 | SN74AUC04, SN74AUC08, PCB TL 50 Ohm, SN74AXC1T45 | < 2" on PCB, 4" to SMA and longer for off-board electronics | Chosen for rise/fall time |
| SN74AXC1T45 | Single-bit dual-supply bus transceive | 1.8,3,3 | 10 | SN74LV161, SN74AUC34 | <2" on PCB | Chosen for rise/fall time |
| SN74AUC2G240 | Dual Buffer/Driver with 3-State Outputs | 1.8 | 1 | LMK1C1103, 74AUC1G74 | <2" on PCB | Chosen for rise/fall time |
| 74AUC1G74 | Single D Flip-Flop, Low-Voltage CMOS | 1.8 | 1 | SN74AUC08, 50 Ohm PCB TL | < 2" on PCB, 4" to SMA and longer for off-board electronics | |
| SN74AUC04 | Hex Inverter | 1.8 | 15 | SN74AUC08 | < 2" on PCB | Chosen for rise/fall time |
| SN74AUC08 | 4-ch, 2-input 0.8-V to 2.7-V ultra-high-speed (2.4 ns) AND gate | 1.8 | 30 | SN74AUC34, SN74AUC08 | < 2" on PCB | Chosen for rise/fall time |
| CLVC257AQPWRG4Q1 | SN74LVC257A-Q1 Automotive Quadruple 2-Line To 1-Line Data Selector/Multiplexer With 3-State Outputs | 3.3 | 10 | 50 Ohm PCB TL and off-brd electronics | 4" to SMA and longer for off-board electronics | |
| SN74AUC08 | 4-ch, 2-input 0.8-V to 2.7-V ultra-high-speed (2.4 ns) AND gate | 1.8 | 30 | SN74AUC34 | < 2" on PCB | Chosen for rise/fall time |
| SN74LV161 | 4-Bit Synchronous binary counter | 3.3 | 10 | SN74ALVC04 (RCO), SN74AXC1T45 (RCO), | < 2" on PCB | Chosen to implement a modulo n Counter |
| SN74ALVC04 | Hex Inverter | 3.3 | 10 | Self | < 2" on PCB | Chosen to meet hold time delay |
If you have any recommendation, I would appreciate it.
Thanks,
Prasoon
Thanks,
Prasoon
