74HCT160N,652 NXP

INTEGRATED CIRCUITS DATA SHEET For a complete data sheet, please also download: The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications The IC06 74HC/HCT/HCU/HCMOS Logic Package Information The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines 74HC/HCT160 Presettable synchronous BCD decade counter asynchronous reset December 1990 Product specication File under Integrated Circuits, IC06Philips Semiconductors Product specication Presettable synchronous BCD decade 74HC/HCT160 counter asynchronous reset FEATURES input (PE) disables the counting action and causes the data at the data inputs (D to D ) to be loaded into the 0 3 Synchronous counting and loading counter on the positive-going edge of the clock (providing Two count enable inputs for n-bit cascading that the set-up and hold time requirements for PE are met). Preset takes place regardless of the levels at count enable Positive-edge triggered clock inputs (CEP and CET). Asynchronous reset A LOW level at the master reset input (MR) sets all four Output capability: standard outputs of the flip-flops (Q to Q ) to LOW level regardless 0 3 I category: MSI CC of the levels at CP, PE, CET and CEP inputs (thus providing an asynchronous clear function). GENERAL DESCRIPTION The look-ahead carry simplifies serial cascading of the counters. Both count enable inputs (CEP and CET) must The 74HC/HCT160 are high-speed Si-gate CMOS devices be HIGH to count. The CET input is fed forward to enable and are pin compatible with low power Schottky TTL the terminal count output (TC). The TC output thus (LSTTL). They are specified in compliance with JEDEC enabled will produce a HIGH output pulse of a duration standard no. 7A. approximately equal to a HIGH level output of Q . This 0 The 74HC/HCT160 are synchronous presettable decade pulse can be used to enable the next cascaded stage. counters which feature an internal look-ahead carry and The maximum clock frequency for the cascaded counters can be used for high-speed counting. is determined by the CP to TC propagation delay and CEP Synchronous operation is provided by having all flip-flops to CP set-up time, according to the following formula: clocked simultaneously on the positive-going edge of the clock (CP). 1 The outputs (Q to Q ) of the counters may be preset to a f = --------------------------------------------------------------------------------------------------------- 0 3 max t ()CP to TC +t (CEP to CP) P()max SU HIGH or LOW level. A LOW level at the parallel enable QUICK REFERENCE DATA GND = 0 V T =25 C t =t = 6 ns amb r f Notes TYPICAL SYMBOL PARAMETER CONDITIONS UNIT 1. C is used to determine the PD HC HCT dynamic power dissipation propagation delay C =15pF (P in W): t PHL L D CP to Q V =5V 19 21 ns n CC 2 CP to TC 21 24 ns P =C V f + D PD CC i 2 MR to Q 21 23 ns (C V f ) L CC o n where: MR to TC 21 26 ns CET to TC 14 14 ns f = input frequency in MHz i t propagation delay PLH f = output frequency in MHz o CP to Q 19 21 ns n 2 (C V f ) = sum of L CC o CP to TC 21 20 ns outputs CET to TC 14 7 ns C = output load capacitance in L f maximum clock 61 31 MHz max pF frequency V = supply voltage in V CC C input capacitance 3.5 3.5 pF I 2. For HC the condition is C power dissipation notes 1 and 2 PD V = GND to V I CC capacitance per 39 34 pF For HCT the condition is package V = GND to V - 1.5 V I CC December 1990 2