Programmable Timer Single 16-Pin PDIP Tube

HCF4536B is a monolithic integrated circuit fabricated in Metal Oxide Semiconductor technology available in DIP package.HCF4536B is a programmable timer consisting of 24 ripple-binary counter stages. The salient feature of this device is its flexibility. The device can count from 1 to 224 or the first 8 stages can be bypassed to allow an output, selectable by a 4-bit code, from any one of the remaining 16 stages. It can be driven by an external clock or an RC oscillator that can be constructed using on-chip components. Input IN1 serves as either the external clock input or the input to the on-chip RC oscillator. OUT1 and OUT2 are connection terminals for the external RC components. In addition, an on-chip monostable circuit is provided to allow a variable pulse width output. Various timing functions can be achieved using combinations of these capabilities. A logic "1" on the 8-BYPASS input enables a bypass of the first 8 stages and makes stage 9 the first counter stage of the last 16 stages. Selection of 1 of 16 outputs is accomplished by the decoder and the BCD inputs A, B, C, and D. MONO IN is the timing input for the on-chip monostable oscillator. Grounding of the MONO IN terminal through a resistor of 10 K? or higher, disables the one shot circuit and connects the decoder directly to the DECODE OUT terminal. A resistor to VDD and a capacitor to ground from the MONO IN terminal enables the one-shot circuit and controls its pulse width. A fast test mode is enabled by a logic "1" on 8-BYPASS, SET, and RESET. This mode divides the 24-stage counter into three 8-stage sections to facilitate a fast test sequence.

• 24 FLIP-FLOP STAGES - COUNTS FROM 20 TO 224
• LAST 16 STAGES SELECTABLE BY BCDSELECT CODE
• GROUP SELECT INDICATES ONE OR MORE PRIORITY INPUTS
• QUIESCENT CURRENT SPECIFIED UP TO 20V
• STANDARDIZED SYMMETRICAL OUTPUT CHARACTERISTICS
• 5V, 10V AND 15V PARAMETRIC RATINGS
• INPUT LEAKAGE CURRENT II = 100nA (MAX) AT VDD = 18V TA = 25°C
• 100% TESTED FOR QUIESCENT CURRENT
• MEETS ALL REQUIREMENTS OF JEDEC JESD13B "STANDARD SPECIFICATIONS FOR DESCRIPTION OF B SERIES CMOS DEVICES