Pin Name

I/O

Options

Description

SDO

O

¾

Serial interface serial data output

SCK

I/O

¾

Serial interface serial clock input/output (initial

²input²).

SCS

I/O

¾

Serial interface chip select pin, output for master mode, input for slave mode.

OSC4

OSC3

O

I

RTC or

System Clock

Real time clock oscillators. OSC3 and OSC4 are connected to a 32768Hz

crystal oscillator for timing purposes or to a system clock source (depending

on the options). No built-in capacitor.

VDD

¾¾

Positive power supply

OSC2

OSC1

O

I

Crystal or RC

OSC1 and OSC2 are connected to an RC network or a crystal (by options) for

the internal system clock. For RC operation, OSC2 is an output pin for 1/4

system clock. The system clock may come from the RTC oscillator. If the sys-

tem clock comes from RTCOSC, these two pins can be left floating.

RES

I

¾

Schmitt trigger reset input, active low

Absolute Maximum Ratings

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

-50°Cto125°C

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

-40°Cto85°C

-100mA

Total Power Dissipation .....................................500mW

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

VFD Supply Voltage

¾¾

0

¾

-30

V

Operating Current (Crystal OSC)

3V

No load, VFD off,

¾

2.0

3.0

mA

5V

¾

5.0

8.0

mA

Operating Current (RC OSC)

3V

No load, VFD off,

¾

1.8

2.7

mA

5V

¾

4.6

7.5

mA

Operating Current

3V

No load, VFD off

¾

1.2

2

mA

5V

¾

47

mA

Operating Current (Crystal OSC)

3V

No load, VFD on,

¾

3.5

4.5

mA

5V

¾

7.5

12

mA

3V

No load, system HALT

VFD off at HALT

¾¾

1

mA

5V

¾¾

2

mA

Standby Current

3V

No load, system HALT

VFD off at HALT

¾

410

mA

5V

¾

14

20

mA

Input Low Voltage for I/O Ports,

TMR and INT

3V

¾

0

¾

V

5V

HT49RV3/HT49CV3

Rev. 1.30

4

March 20, 2007