Absolute Maximum Ratings - Holtek HT827A0 Manual

Pad No. Pad Name I/O
13~20 PD0~PD7 I/O
6 VSS
¾
7~10 PE0~PE3 I/O
11 INT I
12 TMR I
29 AUD O
30 RES I
31 VDD
¾
32 OSC1 I
33 OSC2 O

Absolute Maximum Ratings

Supply Voltage..............................-0.3V to 5.5V
Input Voltage .................V
SS
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.
Mask
Option
Bidirectional 8-bit input/output ports
Pull-high Software instructions determine the CMOS output or
or None schmitt trigger input with or without a pull-high resistor
(mask option).
Negative power supply, ground
¾
Bidirectional 8-bit input/output ports
Pull-high Software instructions determine the CMOS output or
or None schmitt trigger input with or without a pull-high resistor
(mask option).
External interrupt schmitt trigger input with a
¾ pull-high resistor
Edge triggered is activated on a high to low transition.
Schmitt trigger input for a timer/event counter
¾
Audio output for driving an external transistor
¾
PMOS open drain output
¾ Schmitt trigger reset input, active low
Positive power supply
¾
OSC1 and OSC2 connect to an RC network or crystal os-
cillator (determined by mask option) for an internal sys-
Crystal or
tem clock. In the case of RC operation, an oscillation
RC
resistor connects to OSC1. OSC2 is the output terminal
of a 1/4 system clock.
Storage Temperature.................-50°C to 125°C
-0.3V to V +0.3V
Operating Temperature ..............-25°C to 70°C
DD
5
HT827A0
Description
March 15, 2000