HCF4541BEY ,PROGRAMMABLE TIMERLOGIC DIAGRAM 3/10HCF4541B
HCF4541BM1 ,PROGRAMMABLE TIMERHCF4541BPROGRAMMABLE TIMER ■ 16 STAGE BINARY COUNTER■ LOW SYMMETR. OUTPUT RESISTANCE, TYPICALLY 10 ..
HCF4541BM1 ,PROGRAMMABLE TIMERABSOLUTE MAXIMUM RATINGS Symbol Parameter Value UnitV Supply Voltage-0.5 to +22 VDDV DC Input ..
HCF4541M013TR ,PROGRAMMABLE TIMERHCF4541BPROGRAMMABLE TIMER ■ 16 STAGE BINARY COUNTER■ LOW SYMMETR. OUTPUT RESISTANCE, TYPICALLY 10 ..
HCF4541M013TR ,PROGRAMMABLE TIMERABSOLUTE MAXIMUM RATINGS Symbol Parameter Value UnitV Supply Voltage-0.5 to +22 VDDV DC Input ..
HCF4541M013TR ,PROGRAMMABLE TIMERLOGIC DIAGRAM 3/10HCF4541B
HD64F3334YF16 , Old Company Name in Catalogs and Other Documents
HD64F3334YF16 , Old Company Name in Catalogs and Other Documents
HD64F3334YFLH16 , Hitachi Single Chip Microcomputer
HD64F3334YFLH16 , Hitachi Single Chip Microcomputer
HD64F3334YTF16 , Old Company Name in Catalogs and Other Documents
HD64F3337YFLH16 , Hitachi Single Chip Microcomputer
HCF4541BEY-HCF4541BM1-HCF4541M013TR
PROGRAMMABLE TIMER
1/10September 2002 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"
DESCRIPTIONThe 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
HCF4541BPROGRAMMABLE TIMER
PIN CONNECTION
ORDER CODES
HCF4541B2/10
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
"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
INPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
RC OSCILLATOR CIRCUIT
HCF4541B3/10
FUNCTIONAL DIAGRAM
FREQUENCY SELECTION TABLE TRUTH TABLE
LOGIC DIAGRAM
HCF4541B4/10
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 VSS pin voltage.
RECOMMENDED OPERATING CONDITIONS
HCF4541B5/10
DC SPECIFICATIONS The Noise Margin for both "1" and "0" level is: 1V min. with VDD=5V, 2V min. with VDD=10V, 2.5V min. with VDD=15V
HCF4541B6/10
DYNAMIC ELECTRICAL CHARACTERISTICS (T amb = 25°C, CL = 50pF, RL = 200KΩ, tr = tf = 20 ns)
(*) Typical temperature coefficient for all VDD value is 0.3 %/°C.
DIGITAL TIMER APPLICATION A positive MASTER RESET pulse clears the
counter and latch. The Output goes high and
keeps up till the number of pulses, selected by A
and B , are counted. This circuit is retriggerable
and is as accurate as the input frequency. If a
more accurate circuit is desired, an external clock
can be used on pin 3. A set-up time equal to the
width of the one shot output is required
immediately following initial power up, during
which time the output will be high
