Pin Name

I/O

Options

Description

RES

I

¾

Schmitt trigger reset input. Active low

VDD

¾¾

Positive power supply

OSC1/PG1

OSC2/PG2

I

O

Pull-high*

Crystal

or RC

or Int. RC+I/O

or Int. RC+RTC

OSC1, OSC2 are connected to an RC network or Crystal (determined by

option) for the internal system 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 se-

lected, the pull-high option can also be enabled or disabled. Otherwise the

PG1 and PG2 are used as internal registers (pull-high resistors are always

disabled).

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

Absolute Maximum Ratings

Storage Temperature ............................

-50°Cto125°C

Operating Temperature...........................

-40°Cto85°C

Note: These are stress ratings only. Stresses exceeding the range specified under

²Absolute Maximum Ratings² 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 exposure to extreme conditions may affect device reliabil-

ity.

D.C. Characteristics

Ta=25

°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Conditions

Operating Voltage

2.2

¾

5.5

V

3.3

¾

5.5

V

Operating Current

(Crystal OSC, RC OSC)

3V

¾

12

mA

5V

¾

2.5

5

mA

Operating Current

(Crystal OSC, RC OSC)

5V

¾

48

mA

Standby Current

(WDT OSC Enabled RTC Off)

3V

No load, system HALT

¾¾

5

mA

5V

¾¾

10

mA

Standby Current

(WDT OSC Disabled RTC Off)

3V

No load, system HALT

¾¾

1

mA

5V

¾¾

2

mA

Standby Current

(WDT OSC Disabled, RTC On)

3V

No load, system HALT

¾¾

5

mA

5V

¾¾

10

mA

Input Low Voltage for I/O Ports

¾¾

0

¾

V

Input High Voltage for I/O Ports

¾¾

¾

V

Input Low Voltage (RES)

¾¾

0

¾

V

Input High Voltage (RES)

¾¾

¾

V

Low Voltage Reset

¾ LVRenabled

2.7

3.0

3.3

V

I/O Port Sink Current

3V

48

¾

mA

5V

10

20

¾

mA

HT48R50A-1/HT48C50-1

Rev. 2.00

4

March 8, 2006