HCF4541B
PROGRAMMABLE TIMER
■
■
■
■
■
■
■
■
■
■
■
■
■
16 STAGE BINARY COUNTER
LOW SYMMETR. OUTPUT RESISTANCE,
TYPICALLY 100Ω at VDD = 15V
OSCILLATOR FREQUENCY RANGE :
DC to 100KHz
AUTO OR MASTER RESET DISABLES
OSCILLATOR DURING RESET TO REDUCE
POWER DISSIPATION
OPERATES WITH VERY SLOW CLOCK
RISE AND FALL TIMES
BUILT-IN LOW-POWER RC OSCILLATOR
EXTERNAL CLOCK (applied to pin 3) CAN
BE USED INSTEAD OF OSCILLATOR
OPERATES AS 2n FREQUENCY DIVIDER
OR AS A SINGLE-TRANSITION TIMER
Q/Q SELECT PROVIDES OUTPUT LOGIC
LEVEL FLEXIBILITY
CAPABLE OF DRIVING SIX LOW POWER
TTL LOADS, THREE LOW POWER
SCHOTTKY LOADS, OR SIX HTL LOADS
OVER THE RATED TEMP. RANGE
5V, 10V AND 15V PARAMETRIC RATINGS
100% TESTED FOR QUIESCENT CURRENT
AT 20V
MEETS ALL REQUIREMENTS OF JEDEC
JESD13B " STANDARD SPECIFICATIONS
FOR DESCRIPTION OF B SERIES CMOS
DEVICES"
DIP
SOP
ORDER CODES
PACKAGE
TUBE
T&R
DIP
SOP
HCF4541BEY
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
PIN CONNECTION
September 2002
1/10
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 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 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
INPUT EQUIVALENT CIRCUIT
"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 RTC CTC
where f is between 1KHz and 100KHz and RS >
10 KΩ and ≈2 RTC
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
12, 13
4, 11
A, B
NC
1, 2
RTC, CTC
3
RS
5
6
10
7
AR
MR
MODE
Q/Q
SELECT
Q
VSS
Time Select Input
Not Connected
External Resistor, Capacitor Connection
External Resistor Connection or External Clock
Input
Auto Reset Input
Master Reset Input
Mode Select Input
14
VDD
9
8
RC OSCILLATOR CIRCUIT
2/10
Output Selector
Output
Negative Supply Voltage
Positive Supply Voltage
HCF4541B
FUNCTIONAL DIAGRAM
FREQUENCY SELECTION TABLE
TRUTH TABLE
A
B
N. of Stages N
Count 2N
L
L
H
H
L
H
L
H
13
10
8
16
8192
1024
256
65536
STATE
PIN
5
6
9
10
L
H
Auto Reset On
Master Reset Off
Output Initially Low
After Reset (Q)
Single Transition Mode
Auto Reset Disable
Master Reset On
Output Initially High
After Reset (Q)
Recycle Mode
LOGIC DIAGRAM
3/10
HCF4541B
ABSOLUTE MAXIMUM RATINGS
Symbol
VDD
Parameter
Supply Voltage
VI
DC Input Voltage
II
DC Input Current
PD
Value
Unit
-0.5 to +22
V
-0.5 to VDD + 0.5
± 10
V
mA
200
100
mW
mW
Top
Power Dissipation per Package
Power Dissipation per Output Transistor
Operating Temperature
-55 to +125
°C
Tstg
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 VSS pin voltage.
RECOMMENDED OPERATING CONDITIONS
Symbol
VDD
4/10
Parameter
Supply Voltage
VI
Input Voltage
Top
Operating Temperature
Value
Unit
3 to 20
V
0 to VDD
V
-55 to 125
°C
HCF4541B
DC SPECIFICATIONS
Test Condition
Symbol
IL
VOH
VOL
VIH
VIL
IOH
IOL
II
CI
Parameter
Quiescent Current
High Level Output
Voltage
Low Level Output
Voltage
VI
(V)
0/5
0/10
0/15
0/20
0/5
0/10
0/15
5/0
10/0
15/0
High Level Input
Voltage
Low Level Input
Voltage
Output Drive
Current
Output Sink
Current
Input Leakage
Current
Input Capacitance
VO
(V)
0/5
0/5
0/10
0/15
0/5
0/10
0/15
0/18
0.5/4.5
1/9
1.5/13.5
4.5/0.5
9/1
13.5/1.5
2.5
4.6
9.5
13.5
0.4
0.5
1.5
Value
|IO| VDD
(µA) (V)
很抱歉,暂时无法提供与“HCF4541BEY”相匹配的价格&库存,您可以联系我们找货
免费人工找货