NR8576 Series

NIPPON PRECISION CIRCUITS—3

PIN DESCRIPTION

SPECIFICATIONS

Absolute Maximum Ratings

Recommended Operating Conditions

Name

I/O

Description

VSS

–

Ground

CE

I

Chip enable.

HIGH: Enable

LOW: DATA goes high impedance; input on WR, CLK, and DATA stops; and the TM bit is cleared.

FSEL

I

FOUT output frequency select.

HIGH: 1 Hz

LOW: 32.768 kHz

WR

I

DATA input/output control switch.

HIGH: Data input mode (RTC write)

LOW: Data output mode (RTC read)

FOE

I

FOUT output enable control.

HIGH: The frequency selected by FSEL is output on FOUT.

LOW: FOUT goes high impedance.

VDD

–

Supply voltage.

Connect a

≥ 0.1 µF capacitor between VDD and VSS.

CLK

I

System clock input.

Data is input (RTC write mode) and output (RTC read mode) on the rising edge of CLK.

DATA

I/O

Data read and write input/output

FOUT

O

Frequency output (output controlled by FOE and frequency selected by FSEL).

In 1 Hz output mode, the 1 Hz signal is synchronized to the internal 1 second signal.

FOUT output is not affected by the CE signal.

N. C

–

No connection. Leave open for normal use.

Parameter

Symbol

Condition

Rating

Unit

Supply voltage range

−0.3 to 7.0

V

Input voltage range

V

Output voltage range

V

Storage temperature range

−55 to 125

°C

Soldering temperature

260

°C

Soldering time

10

s

Parameter

Symbol

Condition

Rating

Unit

Supply voltage range

2.5 to 5.5

V

Clock supply voltage range

1.4 to 5.5

V

Operating temperature range

−40 to 85

°C