74HC161 4-Bit Presettable Synchronous Binary Counter IC (74161) DIP-16 Package
Couldn't load pickup availability
The 74HC161 is a synchronous presettable binary counter with an internal look-head carry. Synchronous operation is provided by having all flip-flops clocked simultaneously on the positive-going edge of the clock (CP). The outputs (Q0 to Q3) of the counters maybe preset HIGH or LOW. A LOW at the parallel enable input (PE) disables the counting action and causes the data at the data inputs (D0 to D3) to be loaded into the counter on the positive-going edge of the clock. Preset takes place regardless of the levels at count enable inputs (CEP and CET). A LOW at the master reset input (MR) sets Q0 to Q3 LOW regardless of the levels at input pins CP, PE, CET and CEP (thus providing an asynchronous clear function). The look-ahead carry simplifies serial cascading of the counters. Both CEP and CET must be HIGH to count. The CET input is fed forward to enable the terminal count output (TC). The TC output thus enabled will produce a HIGH output pulse of a duration approximately equal to a HIGH output of Q0. This pulse can be used to enable the next cascaded stage. The maximum clock frequency for the cascaded counters is determined by the CP to TC propagation delay and CEP to CP set-up time ,according to the following formula:
Features :-
- Synchronous counting and loading
- Two count enable inputs for n-bit cascading
- Positive-edge triggered clock
- Asynchronous reset
- Output capability: standard
- ICC category: MSI
| Parameter | Condition | Typical | Unit | |
| HC | HCT | |||
| Propagation delay (tPHL) | CL = 15 pF; VCC = 5 V |
54 | 64 | ns |
| CP to Qn | 23 | 43 | ns | |
| CP to TC | 28 | 48 | ns | |
| MR to Qn | 29 | 46 | ns | |
| MR to TC | 30 | 51 | ns | |
| CET to TC | 17 | 35 | ns | |
| set-up time CEP, CET to CP | 170 | 47 | ||
| output transition time | 7 | 15 | ns | |
| clock pulse width HIGH or LOW | 16 | 7 | ns | |
| CET to TC | 17 | 35 | ns | |
| master reset pulse width; LOW | 20 | 10 | MHz | |
| removal time MR to CP | 20 | 6 | pF | |
| maximum clock pulse frequency | 4.6 | 13 | pF | |
The Custom Tab allows you to display personalized content on your product page with full flexibility.
You can easily manage what appears inside this tab by choosing one of the following options:
- Manual Input: Enter content directly in the theme settings.
- Metafield Source: Connect the tab to a metafield to display dynamic, product-specific information.
- Page Content: Pull existing content from a Shopify page to reuse or centralize updates.
This feature is ideal for showing size guides, care instructions, brand stories, shipping details, or any custom information you want your customers to see — all without touching any code.