FUNCTIONAL DIAGRAM

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

Supply Voltage : HCC Types

HCF Types

– 0.5 to + 20

– 0.5 to + 18

V

V

Input Voltage

V

DC Input Current (any one input)

± 10

mA

Total Power Dissipation (per package)

Dissipation per Output Transistor

200

100

mW

mW

Operating Temperature : HCC Types

HCF Types

– 55 to + 125

–40 to + 85

°C

°C

Storage Temperature

– 65 to + 150

°C

Stresses above those listed under ”Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and

functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not

implied. Exposure to absolute maximum rating conditions for external periods may affect device reliability.

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 cir-

cuit is provided to allow a variable pulse width out-

put. 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 sta-

ges and makes stage 9 the first counter stage of the

last 16 stages. Selection of 1 of 16 outputs is accom-

plished 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 10K

Ω or higher, disa-

bles the one-shot circuit and connects the decoder

directly to the DECODE OUT terminal. A resistor to

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 di-

vides the 24-stage counter into three 8-stage sec-

tions to facilitate a fast test sequence.

HCC/HCF4536B

2/17