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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
HCF4538
DUAL MONOSTABLE MULTIVIBRATOR
1/10September 2001 RETRIGGERABLE/RESETTABLE
CAPABILITY TRIGGER AND RESET PROPAGATION
DELAYS INDEPENDENT OF RX, CX TRIGGERING FROM LEADING OR
TRAILING EDGE Q AND Q BUFFERED OUTPUT AVAILABLE SEPARATE RESETS WIDE RANGE OF OUTPUT PULSE WIDTHS QUIESCENT CURRENT SPECIFIED UP TO
20V 5V, 10V AND 15V PARAMETRIC RATINGS SCHMITT TRIGGER INPUT ALLOWS
UNLIMITED RISE AND FALL TIMES ON +TR
AND -TR INPUTS INPUT LEAKAGE CURRENT
II = 100nA (MAX) AT VDD = 18V TA = 25°C 100% TESTED FOR QUIESCENT CURRENT MEETS ALL REQUIREMENTS OF JEDEC
JESD13B " STANDARD SPECIFICATIONS
FOR DESCRIPTION OF B SERIES CMOS
DEVICES"
DESCRIPTIONThe HCF4538B is a monolithic integrated circuit
fabricated in Metal Oxide Semiconductor
technology available in DIP and SOP packages.
The HCF4538B dual precision monostable
multivibrator provides stable retriggerable/
resettable one-shot operation for any fixed voltage
timing application. An external resistor (RX) and
an external capacitor (CX) control the timing and
accuracy for the circuit. Adjustment of RX and CXprovides a wide range of output pulse widths from
the Q and Q terminals. The time delay from trigger
input to output transition (trigger propagation
delay) and the time delay from reset input to
output transition (reset propagation delay) and the
time delay from reset input to output transition
(reset propagation delay) are independent of RX
and CX . Precision control of output pulse width is
achieved through linear CMOS techniques.
Leading edge triggering (+TR) and trailing edge
triggering (-TR) inputs are provided for triggering
HCF4538BDUAL MONOSTABLE MULTIVIBRATOR
PIN CONNECTION
ORDER CODES
HCF4538B2/10
from either edge of an input pulse. An unused +TR
input should be tied to VSS. An unused -TR input
should be tied to VDD . A RESET (on low level) is
provided for immediate termination of the output
pulse or to prevent output pulses when power is
turned on. An unused RESET input should be tied
to VDD . However, if an entire section of the
HCF4538B is not used, its inputs must be tied to
either VDD or VSS (see table 1). In normal
operation the circuit triggers (extends the output
pulse one period) on the application of each new
trigger pulse. For operation in the non-retiggerable
mode, Q is connected to -TR when leading edge
triggering (+TR) is used or Q is connected to +TR
when trailing edge triggering (-TR) is used. The
time period (T) for this multivibrator can be
calculated by : T = RX CX. The min. value of
external resistance, RX, is 4KΩ. The max. and
min. values of external capacitance, CX , are 100
μF and 5nF, respectively.
IINPUT EQUIVALENT CIRCUIT PIN DESCRIPTION Terminals 1, 8, 15 are electrically connected internally
FUNCTIONAL DIAGRAM
HCF4538B3/10
TABLE 1 : Functional Terminal Connections A Retriggerable one-shot multivibrator has an output pulse width which is extended on full time period (T) after application of the last trigger
pulse.
A Non-Retriggerable one-shot multivibrator has a time period (T) referenced from the application of the firs trigger pulse.
LOGIC DIAGRAM
HCF4538B4/10
LOGIC DIAGRAM
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
HCF4538B5/10
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
HCF4538B6/10
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.
(1) Minimum RX value = 4KΩ , minimum CX value = 5000 pF
