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September 2001s 16STAGE BINARY COUNTER
s
LOW SYMMETR.OUTPUT RESISTANCE,TYPICALLY 100Ωat V DD =15V
s
OSCILLATOR FREQUENCY RANGE :DC to 100KHz
服务器
部署s
AUTO OR MASTER RESET DISABLES
OSCILLATOR DURING RESET TO REDUCE POWER DISSIPATION
s
OPERATES WITH VERY SLOW CLOCK RISE AND FALL TIMES
s BUILT-IN LOW-POWER RC OSCILLATOR s
EXTERNAL CLOCK (applied to pin 3)CAN BE USED INSTEAD OF OSCILLATOR
s
OPERATES AS 2n FREQUENCY DIVIDER OR AS A SINGLE-TRANSITION TIMER s
Q/Q SELECT PROVIDES OUTPUT LOGIC LEVEL FLEXIBILITY
s
CAPABLE OF DRIVING SIX LOW POWER TTL LOADS,THREE LOW POWER
SCHOTTKY LOADS,OR SIX HTL LOADS OVER THE RATED TEMP .RANGE
s 5V,10V AND 15V PARAMETRIC RATINGS s
100%TESTED FOR QUIESCENT CURRENT AT 20V
s
MEETS ALL REQUIREMENTS OF JEDEC JESD13B ”STANDARD SPECIFICATIONS FOR DESCRIPTION OF B SERIES CMOS DEVICES”
DESCRIPTION
The HCF4541B is a monolithic integrated circuit fabricated in Metal Oxide Semiconductor technology available in DIP and SOP packages.This device is composed of a 16-stages binary counter,an oscillator controlled by 2external resistors and a capacitor,an output control logic and an automatic power-on reset circuit.The counter varies on positive-edge clock transition and it can be cleared by the MASTER RESET input.The output from this timer is the Q or Q output from the 8th,13th,or 16th counter stage.The choice of the stage depends on the time
HCF4541B
PROGRAMMABLE TIMER
PIN CONNECTION
ORDER CODES
PACKAGE TUBE T &R DIP HCF4541BEY SOP
HCF4541BM1
HCF4541M013TR
DIP SOP
HCF4541B
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select inputs A or B (see frequency selection table).The output is available in one of the two modes that can be selected via the MODE input pin 10(see truth table).The output turns out as a continuos square wave,with a frequency equal to the oscillator frequency divided by 2N .When this MODE input is a logic ”1”,when it is a logic ”0”and after a MASTER RESET is started,and Q output has been selected,the output goes up to a high state after 2N-1counts.It remains in that state till another MASTER RESET pulse is apply or the mode input is a logic ”1”.The process starts by setting the AUTO RESET input (pin 5)to logic ”0”and switching power on.If pin 5is set to logic ”1”,the AUTO RESET circuit is not enabled and counting cannot start till a positive MASTER RESET pulse is applied,returning to a low level.The AUTO RESET consumes a remarkable amount of power and sh
ould not be used if low power operation is wanted.The frequency of the oscillator depends on the RC network.It can be calculated using the following formula :f =1/2.3R TC C TC
where f is between 1KHz and 100KHz and RS >10K Ωand ≈2R TC INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
RC OSCILLATOR CIRCUIT
PIN No SYMBOL NAME AND FUNCTION 12,13A,B Time Select Input 4,11NC Not Connected
1,2R TC ,C TC
External Resistor,Capaci-tor Connection
3R S External Resistor Con-nection or External Clock Input
5AR Auto Reset Input 6MR Master Reset Input 10MODE Mode Select Input 9Q/Q SELECT
Output Selector 8Q Output
7V SS Negative Supply Voltage 14
V DD
Positive Supply Voltage
HCF4541B
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FUNCTIONAL DIAGRAM
FREQUENCY SELECTION TABLE
TRUTH TABLE
LOGIC DIAGRAM
A B N.of Stages N
Count 2N L L 138192L H 101024H L 18256H
H
16
65536
PIN STATE
Lled斗胆灯
H
5Auto Reset On Auto Reset Disable 6Master Reset Off Master Reset On 9Output Initially Low After Reset (Q)Output Initially High After Reset (Q)10
Single Transition Mode
Recycle Mode
HCF4541B
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ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur.Functional operation under these conditions is not implied.
All voltage values are referred to V SS pin voltage.
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter
Value Unit V DD Supply Voltage -0.5to +22V V I DC Input Voltage -0.5to V DD +0.5
V I I DC Input Current
±10mA P D Power Dissipation per Package
200mW Power Dissipation per Output Transistor 100mW T op Operating Temperature -55to +125°C T stg结核杆菌蛋白芯片
Storage Temperature
-65to +150
°C
Symbol Parameter
Value Unit V DD Supply Voltage 3to 20V V I Input Voltage
0to V DD V T op
Operating Temperature
-55to 125
°C
HCF4541B
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DC SPECIFICATIONS
The Noise Margin for both ”1”and ”0”level is:1V min.with V DD =5V,2V min.with V DD =10V,2.5V min.with V DD =15V
Symbol
Parameter
Test Condition
Value Unit
V I (V)V O (V)
|I O |(µA)V DD (V)
T A =25°C -40to 85°C -55to 125°C Min.
Typ.Max.Min.
Max.Min.
Max.I L
Quiescent Current
0/550.045150150µA
0/10100.0410*******/15150.04206006000/20200.08
3000
3000
V OH
High Level Output Voltage
0/5<15 4.95 4.95 4.95V
0/10<1109.959.959.950/15<11514.95
14.95
V OL
Low Level Output Voltage 5/0<150.050.050.05V
10/0<1100.050.050.0515/0
<1150.05
0.05
0.05
V IH
High Level Input Voltage 0.5/4.5<15 3.5 3.5 3.5V
1/9<1107771.5/13.5<11511
11
11
V IL
Low Level Input Voltage 4.5/0.5<15 1.5 1.5 1.5V
9/1<11033313.5/1.5<1154
4
4
I OH
Output Drive Current
0/5 2.5<15-1.55-3.1-1.08-1.08mA
0/5 4.6<15-5-10-3-4.10/109.5<110-4-8-3.3-3.30/1513.5<115-10-20-8.4-8.4I OL
Output Sink Current
0/50.4<15 1.55 3.1 1.08 1.08mA 0/100.5<11048 3.3 3.30/15 1.5
<1
1510
208.4
8.4
I I Input Leakage Current
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Any Input 18
±10-5±0.1±1
VBTA-12±1
µA C I
Input Capacitance
Any Input
5
7.5
pF
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