MC146818AS 查看數據表（PDF） - Motorola => Freescale

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MC146818AS

REAL-TIME CLOCK PLUS RAM

Motorola => Freescale 

FIGURE 1 – BLOCK DIAGRAM

—

Clock ~

CKOUT

+ output ~

CKFS

sow

~Q

RESET

Ps

User RAM

(50 Bytes)

,i,>,~

~:*.,*..*$:,~\ >h <. .,

. ..

$.;).,,<,:??+

,’<;}-.:

MAXIMUM

RATINQ~~(@oJjages referenced to VSS)

R~$n& “~:?’

Symbol

Value

Supply Volta~J**

“ ‘$?

VDD

–0.3 to +8.0

All Input V:$~&.~xcept

OSC1

Vin

V5S– O.5 to VDD+O.5

Current ~rai~~r Pin Excluding

I

10

Vmi,a%q,.vs s

Op&~~~&Temperature

‘~%$~6818A

‘<@c146818AC

Range

TL to TH

0 to 70

TA

– 40 to 85

Storage Temperature Range

Tstg

–55to +150

v

Unit

v

v

mA

Oc

Oc

THERMAL CHARACTERISTICS

Characteristic

Thermal Resistance

Plastic

Cerdlp

Ceramic

Symbol I Value

Unit

I I 120I I

9JA

65

“c/w

50

This device contains circuitry to protect the in-

puts against damage due to high static voltages

or electric fields; however, it is advised that nor-

mal precautions be taken to avoid application of

any voltage higher than maximum rated voltages

to this high-impedance circuit. For proper opera-

tion it is recommended that Vin and Vout be con-

strained to the range VSS =(Vin or Voutl

s VDD. Reliability of operation is enhanced if

unused inputs are tied to an appropriate logic

voltage level (e. g., either VSS or VDD).

MOTOROLA

@

Semiconductor Products Inc.

2

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