74HC/HCT161 Presettable Synchronous 4-bit Binary Counter; Asynchronous Reset

The 74HC/HCT161 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74HC/HCT161 are synchronous presettable binary Counters which feature an internal look-ahead carry 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 (CP).The outputs (Q0 to Q3) of the Counters may be preset to a HIGH or LOW level. A LOW level 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 (providing that the set-up and hold time requirements for PE are met). Preset takes place regardless of the levels at count enable inputs (CEP and CET).A LOW level at the master reset input (MR) sets all four outputs of the Flip-Flops (Q0 to Q3) to LOW level regardless of the levels at CP, PE, CET and CEP inputs (thus providing an asynchronous clear function).The look-ahead carry simplifies serial cascading of the Counters Both count enable inputs (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 level 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: fmax = (1) / (tP(max) (CP to TC) + tSU (CEP to CP) )
By NXP Semiconductors
Part Manufacturer Description Datasheet Samples
SN74HC161NSRG4 Rochester Electronics LLC Binary Counter, HC/UH Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS, PDSO16, GREEN, PLASTIC, SOP-16
SN74HC161FN Rochester Electronics LLC Binary Counter,
SN74HC161PWTG4 Rochester Electronics LLC Binary Counter, HC/UH Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS, PDSO16, GREEN, PLASTIC, TSSOP-16
SN74HC161PWE4 Rochester Electronics LLC Binary Counter, HC/UH Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS, PDSO16, GREEN, PLASTIC, TSSOP-16
SN74HC161FN3 Rochester Electronics LLC Binary Counter,
SN74HC161D3 Rochester Electronics LLC Binary Counter,
MM74HC161SJ Rochester Electronics LLC Binary Counter, HC/UH Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS, PDSO16, 5.30 MM, EIAJ TYPE2, SOP-16
SN74HC161DTG4 Rochester Electronics LLC Binary Counter, HC/UH Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS, PDSO16, GREEN, PLASTIC, MS-012AC, SOIC-16
SN74HC161J4 Rochester Electronics LLC Binary Counter,
MM74HC161J Rochester Electronics LLC Binary Counter, HC/UH Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS, CDIP16, CERAMIC, DIP-16
74HC161 's Packages74HC161 's pdf datasheet
74HC161D SO
74HC161DB SSOP
74HC161N DIP
74HC161PW TSSOP
74HCT161D SO
74HCT161DB SSOP
74HCT161N DIP
74HCT161PW TSSOP




74HC161 Pinout, Pinouts
74HC161 pinout,Pin out
This is one package pinout of 74HC161,If you need more pinouts please download 74HC161's pdf datasheet.

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