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74F161A, 74F163A
General description
4-bit binary counters feature an internal carry look-ahead and can be used for high-speed counting. Synchronous operation is provided by having all flip-flops clocked simultaneously on the positive-going edge of the clock. The clock input is buffered. The outputs of the counters may be preset to High or Low level. A Low level at the Parallel Enable (PE) input disables the counting action and causes the data at the D0-D3 inputs to be loaded into the counter on the positive-going edge of the clock (provided that the setup and hold requirements for PE are met). Preset takes place regardless of the levels at Count Enable (CEP, CET) inputs.
A Low level at the Master Reset (MR) input sets all the four outputs of the flip-flops (Q0-Q3) in 74F161A to Low levels, regardless of the levels at CP, PE, CET and CEP inputs (thus providing an asynchronous clear function). For the 74F163A, the clear function is synchronous. A Low level at the Synchronous Reset (SR) input sets all four outputs of the flip-flops (Q0-Q3) to Low levels after the next positive-going transition on the clock (CP) input (provided that the setup and hold time requirements for SR are met). This action occurs regardless of the levels at PE, CET, and CEP inputs. The synchronous reset feature enables the designer to modify the maximum count with only one external NAND gate . The carry look-ahead simplifies serial cascading of the counters. Both Count Enable (CEP and CET) inputs must be High to count. The CET input is fed forward to enable the TC output. The TC output thus enabled will produce a High output pulse of a duration approximately equal to the High level output of Q0. This pulse can be used to enable the next cascaded stage . The TC output is subjected to decoding spikes due to internal race conditions. Therefore, it is not recommended for use as clock or asynchronous reset for flip-flops, registers, or counters.
Features
- Synchronous counting and loading
- Two count enable inputs for n-bit cascading
- Positive edge-triggered clock
- Asynchronous Master Reset (74F161A)
- Synchronous Reset (74F163A)
- High speed synchronous expansion
- Typical count rate of 130MHz
- Industrial range (-40 Cel to +85 Cel) available
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| I74F161AD | I74F161AD | 9352 077 50112 | Volume production | SOT109-1
(SO16) | Tube | Standard Marking | I74F161AD
| week 6, 2004 |
| I74F161AD | I74F161AD-T | 9352 077 50118 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" | Standard Marking | I74F161AD
| week 6, 2004 |
| I74F161AN | I74F161AN | 9352 077 60112 | Volume production | SOT38-4
(DIP16) | Tube | Standard Marking | I74F161AN
| Always Pb-free |
| N74F161AD | N74F161AD | 9338 121 90602 | Volume production | SOT109-1
(SO16) | Tube (Signetics) | Standard Marking | N74F161AD
| week 6, 2004 |
| N74F161AD | N74F161AD-T | 9338 121 90623 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" (Signetics) | Standard Marking | N74F161AD
| week 6, 2004 |
| N74F161AN | N74F161AN | 9337 947 10602 | Volume production | SOT38-4
(DIP16) | Tube (Signetics) | Standard Marking | N74F161AN
| Always Pb-free |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| I74F161AD | 9352 077 50112 | not available | ||||||
| I74F161AD | 9352 077 50118 | Order samples | ||||||
| I74F161AN | 9352 077 60112 | Order samples | ||||||
| N74F161AD | 9338 121 90602 | 0.2900 | not available | |||||
| N74F161AD | 9338 121 90623 | 0.2900 | Order samples | |||||
| N74F161AN | 9337 947 10602 | 0.3400 | Order samples |
Technical documents
Application Notes
AN202_1;
Testing and specifying FAST logic (01-Jun-87)
AN203_2;
Test Fixtures for High Speed Logic (02-Apr-98)
AN216_2;
Arbitration in shared resource systems (18-Jul-88)
Parametrics/similar products
| Type number | Package | Description | Fmax(MHz) | Propagation Delay(ns) | Voltage | No. of Pins | Logic Switching Levels | Output Drive Capability |
|---|---|---|---|---|---|---|---|---|
| I74F161AD | SOT109-1
(SO16) | Presettable Synchronous 4-Bit Binary Counter; Asynchronous Reset | 130 | 6.5 | 4.5-5.5 V | 16 | TTL | -1/+20 mA |
| I74F161AN | SOT38-4
(DIP16) | Presettable Synchronous 4-Bit Binary Counter; Asynchronous Reset | 130 | 6.5 | 4.5-5.5 V | 16 | TTL | -1/+20 mA |
| N74F161AD | SOT109-1
(SO16) | Presettable Synchronous 4-Bit Binary Counter; Asynchronous Reset | 130 | 6.5 | 4.5-5.5 V | 16 | TTL | -1/+20 mA |
| N74F161AN | SOT38-4
(DIP16) | Presettable Synchronous 4-Bit Binary Counter; Asynchronous Reset | 130 | 6.5 | 4.5-5.5 V | 16 | TTL | -1/+20 mA |
Similar products
74F161A, 74F163A links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.
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