HT827A0 datasheet(5/49 Pages) HOLTEK

5 / 49 page

Pad No. Pad Name I/O

Mask

Option

Description

13~20

PD0~PD7

I/O Pull-high

or None

Bidirectional 8-bit input/output ports

Software instructions determine the CMOS output or

schmitt trigger input with or without a pull-high resistor

(mask option).

VSS

¾¾

Negative power supply, ground

7~10

PE0~PE3

I/O Pull-high

or None

Bidirectional 8-bit input/output ports

Software instructions determine the CMOS output or

schmitt trigger input with or without a pull-high resistor

(mask option).

INT

External interrupt schmitt trigger input with a

pull-high resistor

Edge triggered is activated on a high to low transition.

TMR

Schmitt trigger input for a timer/event counter

AUD

Audio output for driving an external transistor

PMOS open drain output

RES

Schmitt trigger reset input, active low

VDD

¾¾

Positive power supply

OSC1

OSC2

Crystal or

OSC1 and OSC2 connect to an RC network or crystal os-

cillator (determined by mask option) for an internal sys-

tem clock. In the case of RC operation, an oscillation

resistor connects to OSC1. OSC2 is the output terminal

of a 1/4 system clock.

Absolute Maximum Ratings

Supply Voltage..............................-0.3V to 5.5V

Storage Temperature.................-50°Cto125°C

Input Voltage.................VSS-0.3V to VDD+0.3V

Operating Temperature ..............-25°Cto70°C

Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maxi-

mum Ratings² may cause substantial damage to the device. Functional operation of this de-

vice at other conditions beyond those listed in the specification is not implied and prolonged

exposure to extreme conditions may affect device reliability.

HT827A0

March 15, 2000

HT827A0 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc

HT827A0 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc

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