MC1455B ON Semiconductor, MC1455B Datasheet

MC1455B

Manufacturer Part Number

MC1455B

Description

Timers

Manufacturer

ON Semiconductor

Datasheet

1.MC1455B.pdf (10 pages)

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MC1455, MC1455B,

NCV1455B

Timers

capable of producing accurate time delays or oscillation. Additional

terminals are provided for triggering or resetting if desired. In the time

delay mode, time is precisely controlled by one external resistor and

capacitor. For astable operation as an oscillator, the free−running

frequency and the duty cycle are both accurately controlled with two

external resistors and one capacitor. The circuit may be triggered and

reset on falling waveforms, and the output structure can source or sink

up to 200 mA or drive MTTL circuits.

March, 2004 − Rev. 8

t = 1.1; R and C = 22 sec

Time delay (t) is variable by

changing R and C (see Figure 16).

The MC1455 monolithic timing circuit is a highly stable controller

Control Voltage

Direct Replacement for NE555 Timers

Timing from Microseconds through Hours

Operates in Both Astable and Monostable Modes

Adjustable Duty Cycle

High Current Output Can Source or Sink 200 mA

Output Can Drive MTTL

Temperature Stability of 0.005% per C

Normally ON or Normally OFF Output

Semiconductor Components Industries, LLC, 2004

0.1 mF

Figure 1. 22 Second Solid State Time Delay Relay Circuit

Threshold

10 k

Trigger

0.01 mF

Figure 2. Representative Block Diagram

5 k

MC1455

−

Comp

Gnd

1.0 k

1.0 mF

1N4740

Reset

Inhibit/

Reset

Flop

Flip

20 M

−10 V

MT2

250 V

3.5 k

MT1

−

10 mF

Load

1N4003

Discharge

Output

Test circuit for measuring DC parameters (to set output and

a) When V

b) When V

c) When V

measure parameters):

0.01 mF

high, apply Reset voltage, and test for current flowing into Pin 7.

When Reset is not in use, it should be tied to V

See detailed ordering and shipping information in the package

dimensions section on page ___ of this data sheet.

(Create − Named − OrderingInfoText.)

PLASTIC PACKAGE

w 2/3 V

v 1/3 V

is low, Pin 7 sinks current. To test for Reset, set V

Voltage

Control

Sink

Source

Figure 3. General Test Circuit

P1 SUFFIX

CASE 626

CASE 751

Output

D SUFFIX

WL, L

YY, Y

WW, W = Work Week

ORDERING INFORMATION

Reset

, V

http://onsemi.com

MC1455

Gnd

= Specific Device Code

= Assembly Location

= Wafer Lot

= Year

is low.

is high.

Trigger

Publication Order Number:

Discharge

Threshold

DIAGRAMS

XXXXXXXXX

700

MARKING

XXXXXX

2.0 k

ALYW

YYWW

AWL

MC1455/D

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