4541.pdf

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PROGRAMMABLE TIMER
HCF4541B
PROGRAMMABLE TIMER
n
16 STAGE BINARY COUNTER
n
LOW SYMMETR. OUTPUT RESISTANCE,
TYPICALLY 100
W
at V DD = 15V
OSCILLATOR FREQUENCY RANGE :
DC to 100KHz
n
n
AUTO OR MASTER RESET DISABLES
OSCILLATOR DURING RESET TO REDUCE
POWER DISSIPATION
DIP
SOP
n
OPERATES WITH VERY SLOW CLOCK
RISE AND FALL TIMES
ORDER CODES
PACKAGE
n
BUILT-IN LOW-POWER RC OSCILLATOR
TUBE
T & R
EXTERNAL CLOCK (applied to pin 3) CAN
BE USED INSTEAD OF OSCILLATOR
n
DIP
HCF4541BEY
n
OPERATES AS 2 n FREQUENCY DIVIDER
OR AS A SINGLE-TRANSITION TIMER
SOP
HCF4541BM1
HCF4541M013TR
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 2 external
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
n
Q/Q SELECT PROVIDES OUTPUT LOGIC
LEVEL FLEXIBILITY
n
CAPABLE OF DRIVING SIX LOW POWER
TTL LOADS, THREE LOW POWER
SCHOTTKY LOADS, OR SIX HTL LOADS
OVER THE RATED TEMP. RANGE
n
5V, 10V AND 15V PARAMETRIC RATINGS
n
100% TESTED FOR QUIESCENT CURRENT
AT 20V
n
MEETS ALL REQUIREMENTS OF JEDEC
JESD13B ” STANDARD SPECIFICATIONS
FOR DESCRIPTION OF B SERIES CMOS
DEVICES”
PIN CONNECTION
September 2002
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HCF4541B
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 2 N 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 2 N-1 counts. 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 5 is 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 should 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 / 2.3 R TC C TC
where f is between 1KHz and 100KHz and RS >
10 K
and
9
2R TC
INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
12, 13
A, B
Time Select Input
4, 11
NC
Not Connected
1, 2
R TC ,C TC
External Resistor, Capaci-
tor Connection
3
R S
External Resistor Con-
nection or External Clock
Input
5
AR
Auto Reset Input
6
MR
Master Reset Input
10
MODE
Mode Select Input
9
Q/Q
SELECT
Output Selector
8
Q
Output
7
V SS
Negative Supply Voltage
14
V DD
Positive Supply Voltage
RC OSCILLATOR CIRCUIT
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W
21706763.003.png
HCF4541B
FUNCTIONAL DIAGRAM
FREQUENCY SELECTION TABLE
TRUTH TABLE
A
B
N. of Stages N
Count 2 N
PIN
STATE
L
L
13
8192
L
H
L
H
10
1024
5
Auto Reset On
Auto Reset Disable
H
L
8
256
6
Master Reset Off
Master Reset On
H
H
16
65536
Output Initially Low
After Reset (Q)
Output Initially High
After Reset (Q)
9
10 Single Transition Mode
Recycle Mode
LOGIC DIAGRAM
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HCF4541B
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V DD
Supply Voltage
-0.5 to +22
V
V I
DC Input Voltage
-0.5 to V DD + 0.5
V
I I
DC Input Current
±
10
mA
P D
Power Dissipation per Package
200
mW
Power Dissipation per Output Transistor
100
mW
T op
Operating Temperature
-55 to +125
°
C
T stg
Storage Temperature
-65 to +150
°
C
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
3to20
V
V I
Input Voltage
0 to V DD
V
T op
Operating Temperature
-55 to 125
°
C
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HCF4541B
DC SPECIFICATIONS
Test Condition
Value
Symbol
Parameter
V I
(V)
V O
(V)
|I O |
V DD
(V)
T A =25
°
C
-40 to 85
°
C -55 to 125
°
C
Unit
(
m
A)
Min. Typ. Max. Min. Max. Min. Max.
I L
Quiescent Current 0/5
5
0.04
5
150
150
0/10
10
0.04
10
300
300
m
A
0/15
15
0.04
20
600
600
0/20
20
0.08 100
3000
3000
V OH High Level Output
Voltage
0/5
<1
5
4.95
4.95
4.95
0/10
<1
10 9.95
9.95
9.95
V
0/15
<1
15 14.95
14.95
14.95
V OL
Low Level Output
Voltage
5/0
<1
5
0.05
0.05
0.05
10/0
<1
10
0.05
0.05
0.05
V
15/0
<1
15
0.05
0.05
0.05
V IH
High Level Input
Voltage
0.5/4.5 <1
5
3.5
3.5
3.5
1/9
<1
10
7
7
7
V
1.5/13.5 <1
15
11
11
11
V IL
Low Level Input
Voltage
4.5/0.5 <1
5
1.5
1.5
1.5
9/1
<1
10
3
3
3
V
13.5/1.5 <1
15
4
4
4
I OH
Output Drive
Current
0/5
2.5
<1
5 -1.55 -3.1
-1.08
-1.08
0/5
4.6
<1
5
-5
-10
-3
-4.1
mA
0/10
9.5
<1
10
-4
-8
-3.3
-3.3
0/15
13.5
<1
15
-10
-20
-8.4
-8.4
I OL
Output Sink
Current
0/5
0.4
<1
5
1.55 3.1
1.08
1.08
0/10
0.5
<1
10
4
8
3.3
3.3
mA
0/15
1.5
<1
15
10
20
8.4
8.4
I I
Input Leakage
Current
0/18
Any Input
18
±
10 -5
±
0.1
±
1
±
1
m
A
C I
Input Capacitance
Any Input
5
7.5
pF
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
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