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74HC174N 데이터시트(PDF) 2 Page - NXP Semiconductors |
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2 / 13 page 1998 Jul 08 2 Philips Semiconductors Product specification Hex D-type flip-flop with reset; positive-edge trigger 74HC/HCT174 FEATURES • Six edge-triggered D-type flip-flops • Asynchronous master reset • Output capability: standard • ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT174 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/HCT174 have six edge-triggered D-type flip-flops with individual D inputs and Q outputs. The common clock (CP) and master reset (MR) inputs load and reset (clear) all flip-flops simultaneously. The register is fully edge-triggered. The state of each D input, one set-up time prior to the LOW-to-HIGH clock transition, is transferred to the corresponding output of the flip-flop. A LOW level on the MR input forces all outputs LOW, independently of clock or data inputs. The device is useful for applications requiring true outputs only and clock and master reset inputs that are common to all storage elements. QUICK REFERENCE DATA GND = 0 V; Tamb=25 °C; tr =tf = 6 ns Notes 1. CPD is used to determine the dynamic power dissipation (PD in µW): PD =CPD × VCC2 × fi +∑ (CL × VCC2 × fo) where: fi = input frequency in MHz fo = output frequency in MHz ∑ (CL × VCC2 × fo) = sum of outputs CL = output load capacitance in pF VCC = supply voltage in V 2. For HC the condition is VI = GND to VCC For HCT the condition is VI = GND to VCC − 1.5 V SYMBOL PARAMETER CONDITIONS TYPICAL UNIT HC HCT tPHL/ tPLH propagation delay CL = 15 pF; VCC =5 V CP to Qn 17 18 ns MR to Qn 13 17 ns fmax maximum clock frequency 99 69 MHz CI input capacitance 3.5 3.5 pF CPD power dissipation capacitance per flip-flop notes 1 and 2 17 17 pF |
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