74F161A

Features:

Synchronous counting and loading
High-speed synchronous expansion
Typical count frequency of 120 MHz




Pinout






Specifications

Storage Temperature -65°C to +150°C
Ambient Temperature under Bias -55°C to +125°C
Junction Temperature under Bias -55°C to +150°C
V_CC Pin Potential to Ground Pin-0.5V to +7.0V
Input Voltage (Note 3)-0.5V to +7.0V
Input Current (Note 3) -30 mA to +5.0 mA
Voltage Applied to Output
in HIGH State (with V_CC = 0V)
Standard Output -0.5V to V_CC
3-STATE Output -0.5V to +5.5V
Current Applied to Output
in LOW State (Max) twice the rated I_OL (mA)
ESD Last Passing Voltage (Min) 4000V
Free Air Ambient Temperature 0°C to +70°C
Supply Voltage +4.5V to +5.5V

Product	Product status	Eco Status	Pricing*	Package type	Leads	Packing method	Package Drawing	Package Marking Convention**
74F161APC	Full Production	RoHS Compliant	$0.53	DIP	16	RAIL		Line 1: $Y (Fairchild logo) &Z (Asm. Plant Code) &4 (4-Digit Date Code) &K Line 2: 74F161APC
74F161ASC	Full Production	RoHS Compliant	$0.36	SOIC	16	RAIL		Line 1: $Y (Fairchild logo) &Z (Asm. Plant Code) &2 (2-Digit Date Code) &K Line 2: 74F161A
74F161ASCX	Full Production	RoHS Compliant	$0.36	SOIC	16	TAPE REEL		Line 1: $Y (Fairchild logo) &Z (Asm. Plant Code) &2 (2-Digit Date Code) &K Line 2: 74F161A
74F161ASJ	Full Production	RoHS Compliant	$0.83	SOP	16	RAIL		Line 1: $Y (Fairchild logo) &Z (Asm. Plant Code) &2 (2-Digit Date Code) &K Line 2: 74F161A
74F161ASJX	Full Production	RoHS Compliant	$0.491	SOP	16	TAPE REEL		Line 1: $Y (Fairchild logo) &Z (Asm. Plant Code) &2 (2-Digit Date Code) &K Line 2: 74F161A

* Fairchild 1,000 piece Budgetary Pricing

** A sample button will appear if the part is available through Fairchild's on-line samples program. If there is no sample button, please contact a Fairchild distributor to obtain samples

Package marking information for product 74F161A is available. Click here for more information .

Description

The 74F161A is high-speed synchronous modulo-16 binary counters. They are synchronously presettable for application in programmable dividers and have two types of Count Enable inputs plus a Terminal Count output for versatility in forming synchronous multi-stage counters. The 74F161A has an asynchronous Master- Reset input that overrides all other inputs and forces the outputs LOW. The 74F163A has a Synchronous Reset input that overrides counting and parallel loading and allows the outputs to be simultaneously reset on the rising edge of the clock. The 74F161A and 74F163A are highspeed versions of the 74F161 and 74F163.

The 74F161A has the following features including (1)synchronous counting and loading;(2)high-speed synchronous expansion;(3)typical count frequency of 120 MHz.

The 74F161A are high-speed synchronous modulo-16 binary counters. They are synchronously presettable for application in programmable dividers and have two types of Count Enable inputs plus a Terminal Count output for versatility in forming synchronous multi-stage counters. The 74F161A has an asynchronous Master-Reset input that overrides all other inputs and forces the outputs LOW. The 74F161A count in modulo-16 binary sequence. From state 15 (HHHH) they increment to state 0 (LLLL). The clock inputs of all flip-flops are driven in parallel through a clock buffer. Thus all changes of the Q outputs (except due to Master Reset of the 74F161A) occur as a result of, and synchronous with, the LOW-to-HIGH transition of the CP input signal.The 74F161A use D-type edge triggered flipflops and changing the SR, PE, CEP and CET inputs when the CP is in either state does not cause errors, provided that the recommended setup and hold times, with respect to the rising edge of CP, are observed.The Terminal Count (TC) output is HIGH when CET is HIGH and the counter is in state 15. To implement synchronous multi-stage counters, the TC outputs can be used with the CEP and CET inputs in two different ways.The TC output is subject to decoding spikes due to internal race conditions and is therefore not recommended for use as a clock or asynchronous reset for flip-flops, counters or registers.

Life support devices or systems of the 74F161A are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.