HT48C50- datasheet(5/45 Pages) HOLTEK

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Pad

No.

Pad Name I/O Mask Option

Description

OSC1/PG1

OSC2/PG2

Pull-high*

Crystal

or RC

or Int. RC+I/O

or Int.

RC+RTC

OSC1, OSC2 are connected to an RC network or Crys-

tal (determined by mask option) for the internal sys-

tem clock. In the case of RC operation, OSC2 is the

output terminal for 1/4 system clock. These two pins

can also be optioned as an RTC oscillator (32768Hz) or

I/O lines. In these two cases, the system clock comes

from an internal RC oscillator whose frequency has 4

options (3.2MHz, 1.6MHz, 800kHz, 400kHz). If the I/O

option is selected, the pull-high options can also be en-

abled or disabled. Otherwise the PG1 and PG2 are

used as internal registers (pull-high resistors are al-

ways disabled).

Note: * The pull-high resistors of each I/O port (PA, PB, PC, PD, PG) are controlled by options.

Absolute Maximum Ratings

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

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

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

Operating Temperature ..............-40°Cto85°C

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

mum Ratings" may cause substantial damage to the device. Functional operation of this device

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

sure to extreme conditions may affect device reliability.

D.C. Characteristics

Ta=25°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max. Unit

VDD

Conditions

VDD1

Operating Voltage

¾ fSYS=4MHz

2.4

5.5

VDD2

Operating Voltage

¾ fSYS=8MHz

4.5

5.5

IDD1

Operating Current

(Crystal OSC)

No load, fSYS=4MHz

IDD2

Operating Current

(RC OSC)

No load, fSYS=4MHz

IDD3

Operating Current

(Crystal OSC)

5V No load, fSYS=8MHz

ISTB1

Standby Current

(WDT Enabled RTC Off)

No load, system HALT

¾¾

ISTB2

Standby Current

(WDT Disabled RTC Off)

No load, system HALT

¾¾

HT48C50-1

June 14, 2000

Preliminary

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