Datasheet

ManualsBrandsON SEMICONDUCTOR ManualsLogic ICsSMD CMOS IC, SOIC16, Programmable Timer

June, 2011 − Rev. 12

1 Publication Order Number:

MC14541B/D

MC14541B

Programmable Timer

The MC14541B programmable timer consists of a 16−stage binary

counter, an integrated oscillator for use with an external capacitor and

two resistors, an automatic power−on reset circuit, and output control

logic.

Timing is initialized by turning on power, whereupon the power−on

reset is enabled and initializes the counter, within the specified V

range. With the power already on, an external reset pulse can be

applied. Upon release of the initial reset command, the oscillator will

oscillate with a frequency determined by the external RC network. The

16−stage counter divides the oscillator frequency (f

osc

) with the n

stage frequency being f

osc

Features

• Available Outputs 2

, 2

or 2

• Increments on Positive Edge Clock Transitions

• Built−in Low Power RC Oscillator (± 2% accuracy over temperature

range and ± 20% supply and ± 3% over processing at < 10 kHz)

• Oscillator May Be Bypassed if External Clock Is Available

(Apply external clock to Pin 3)

• External Master Reset Totally Independent of Automatic Reset

Operation

• Operates as 2

Frequency Divider or Single Transition Timer

• Q/Q Select Provides Output Logic Level Flexibility

• Reset (auto or master) Disables Oscillator During Resetting to

Provide No Active Power Dissipation

• Clock Conditioning Circuit Permits Operation with Very Slow Clock

Rise and Fall Times

• Automatic Reset Initializes All Counters On Power Up

• Supply Voltage Range = 3.0 Vdc to 18 Vdc with Auto Reset

Supply Voltage Range = Disabled (Pin 5 = V

)

Supply Voltage Range = 8.5 Vdc to 18 Vdc with Auto Reset

Supply Voltage Range = Enabled (Pin 5 = V

)

• These Devices are Pb−Free and are RoHS Compliant

PIN ASSIGNMENT

NC = NO CONNECTION

105

MODE

Q/Q

SEL

http://onsemi.com

MARKING

DIAGRAMS

A = Assembly Location

WL, L = Wafer Lot

YY, Y = Year

WW, W = Work Week

G or G = Pb−Free Package

See detailed ordering and shipping information in the package

dimensions section on page 2 of this data sheet.

ORDERING INFORMATION

PDIP−14

P SUFFIX

CASE 646

MC14541BCP

AWLYYWWG

SOIC−14

D SUFFIX

CASE 751A

TSSOP−14

DT SUFFIX

CASE 948G

14541BG

AWLYWW

541B

ALYWG

SOEIAJ−14

F SUFFIX

CASE 965

MC14541B

ALYWG

(Note: Microdot may be in either location)

Summary of content (10 pages)

PAGE 1
MC14541B Programmable Timer The MC14541B programmable timer consists of a 16−stage binary counter, an integrated oscillator for use with an external capacitor and two resistors, an automatic power−on reset circuit, and output control logic. Timing is initialized by turning on power, whereupon the power−on reset is enabled and initializes the counter, within the specified VDD range. With the power already on, an external reset pulse can be applied.
PAGE 2
MC14541B MAXIMUM RATINGS (Voltages Referenced to VSS) Symbol VDD Vin, Vout Parameter DC Supply Voltage Range Input or Output Voltage Range, (DC or Transient) Value Unit −0.5 to +18.0 V −0.5 to VDD + 0.
PAGE 3
MC14541B ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ELECTRICAL CHARACTERISTICS (Voltages Referenced to VSS) Symbol Characteristic Output Voltage Vin = VDD or 0 VDD Vdc − 55_C 25_C 125_C Min Max Min Typ (Note 2) Max Min Max Unit “0” Level VOL 5.0 10 15 − − − 0.05 0.05 0.05 − − − 0 0 0 0.05 0.05 0.05 − − − 0.05 0.05 0.05 Vdc “1” Level VOH 5.0 10 15 4.95 9.95 14.95 − − − 4.95 9.95 14.95 5.0 10 15 − − − 4.95 9.95 14.
PAGE 4
MC14541B ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ SWITCHING CHARACTERISTICS (Note 5) (CL = 50 pF, TA = 25_C) Characteristic Symbol VDD Min Typ (Note 6) Max 5.0 10 15 − − − 100 50 40 200 100 80 5.0 10 15 − − − 3.5 1.25 0.9 10.5 3.8 2.9 5.0 10 15 − − − 6.0 3.5 2.5 18 10 7.5 tWH(cl) 5.0 10 15 900 300 225 300 100 85 − − − ns fcl 5.0 10 15 − − − 1.5 4.0 6.0 0.75 2.0 3.0 MHz tWH(R) 5.0 10 15 900 300 225 300 100 85 − − − ns trem 5.
PAGE 5
MC14541B EXPANDED BLOCK DIAGRAM A 12 B 13 1 OF 4 MUX 8 Q Rtc 1 C Ctc 2 OSC RS 3 RESET AUTO RESET 5 210 213 216 C 8-STAGE COUNTER RESET 8-STAGE 8 2 COUNTER RESET POWER-ON RESET 6 MASTER RESET 10 MODE 9 Q/Q SELECT VDD = PIN 14 VSS = PIN 7 FREQUENCY SELECTION TABLE A B Number of Counter Stages n 0 0 13 8192 0 1 10 1024 1 0 8 256 1 1 16 65536 Count 2n TRUTH TABLE State 0 Pin Auto Reset, 5 Auto Reset Operating Auto Reset Disabled Master Reset, 6 Timer Operational Master R
PAGE 6
MC14541B TYPICAL RC OSCILLATOR CHARACTERISTICS 8.0 100 VDD = 15 V f, OSCILLATOR FREQUENCY (kHz) FREQUENCY DEVIATION (%) 0 10 V - 4.0 - 8.0 5.0 V - 12 RTC = 56 kW, C = 1000 pF - 16 - 55 - 25 VDD = 10 V 50 4.0 RS = 0, f = 10.15 kHz @ VDD = 10 V, TA = 25°C RS = 120 kW, f = 7.8 kHz @ VDD = 10 V, TA = 25°C 0 25 50 75 TA, AMBIENT TEMPERATURE (°C) 100 f AS A FUNCTION OF RTC (C = 1000 pF) (RS ≈ 2RTC) 20 10 5.0 2.0 1.0 f AS A FUNCTION OF C (RTC = 56 kW) (RS = 120 kW) 0.5 0.2 0.1 1.0 k 125 0.
PAGE 7
MC14541B PACKAGE DIMENSIONS PDIP−14 CASE 646−06 ISSUE P 14 8 1 7 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 5. ROUNDED CORNERS OPTIONAL. B A F L N C −T− SEATING PLANE H G D 14 PL J K 0.13 (0.005) M M http://onsemi.com 7 DIM A B C D F G H J K L M N INCHES MIN MAX 0.715 0.770 0.240 0.260 0.145 0.185 0.015 0.021 0.040 0.070 0.100 BSC 0.
PAGE 8
MC14541B PACKAGE DIMENSIONS SOIC−14 CASE 751A−03 ISSUE J NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. −A− 14 8 −B− P 7 PL 0.25 (0.010) M 7 1 G −T− 0.25 (0.
PAGE 9
MC14541B PACKAGE DIMENSIONS TSSOP−14 CASE 948G−01 ISSUE B 14X K REF 0.10 (0.004) 0.15 (0.006) T U M T U V S S N 2X 14 L/2 0.25 (0.010) 8 M B −U− L PIN 1 IDENT. N F 7 1 0.15 (0.006) T U NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH OR GATE BURRS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4. DIMENSION B DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION.
PAGE 10
MC14541B PACKAGE DIMENSIONS SOEIAJ−14 CASE 965−01 ISSUE B 14 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS D AND E DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS AND ARE MEASURED AT THE PARTING LINE. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4. TERMINAL NUMBERS ARE SHOWN FOR REFERENCE ONLY. 5. THE LEAD WIDTH DIMENSION (b) DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08 (0.