HEF4520BT,653 Nexperia

HEF4520B Dual binary counter Rev. 7 30 March 2016 Product data sheet 1. General description The HEF4520B is a dual 4-bit internally synchronous binary counter. The counter has an active HIGH clock input (nCP0) and an active LOW clock input (nCP1), buffered outputs from all four bit positions (nQ0 to nQ3) and an active HIGH overriding asynchronous master reset input (nMR). The counter advances on either the LOW-to-HIGH transition of the nCP0 input if nCP1 is HIGH or the HIGH-to-LOW transition of the nCP1 input if nCP0 is LOW. Either nCP0 or nCP1 may be used as the clock input to the counter while the other clock input may be used as a clock enable input. Schmitt trigger action makes the clock input highly tolerant of slower clock rise and fall times. A HIGH on nMR resets the counter (nQ0 to nQ3 = LOW) independent of nCP0 and nCP1. It operates over a recommended V power supply range of 3 V to 15 V referenced to V DD SS (usually ground). Unused inputs must be connected to V , V , or another input. DD SS 2. Features and benefits Tolerant of slow clock rise and fall times Fully static operation 5 V, 10 V, and 15 V parametric ratings Standardized symmetrical output characteristics Specified from 40 C to +85 C Complies with JEDEC standard JESD 13-B 3. Ordering information Table 1. Ordering information All types operate from 40 C to +85 C. Type number Package Name Description Version HEF4520BT SO16 plastic small outline package 16 leads body width 3.9 mm SOT109-1HEF4520B Nexperia Dual binary counter 4. Functional diagram 3 3 5 3 3 5 DH D Fig 1. Functional diagram Q&3 Q&3 5Q0 H DD Fig 2. Timing diagram Q4 4 Q 4 Q Q4 4 4 4 4 )) )) )) 3 7 7 7 7 4 4 4 4 3 5 Fig 3. Logic diagram for one counter HEF4520B All information provided in this document is subject to legal disclaimers. Nexperia B.V. 2017. All rights reserved Product data sheet Rev. 7 30 March 2016 2 of 13 DDH Q0 Q& & & & & Q& )) Q4 Q4 Q4 Q4 0 4 4 & 4 & 4 0 4 4 & 4 & 4