MC74HC4538AF ON Semiconductor, MC74HC4538AF Datasheet - Page 9

• Manufacturer Part Number: MC74HC4538AF
• Manufacturer: ON Semiconductor

Specifications of MC74HC4538AF

• Logic Family: HC
• High Level Output Current: -5.2mA
• Low Level Output Current: 5.2mA
• Quiescent Current: 130nA
• Number Of Elements: 2
• Operating Temperature Classification: Military
• Operating Supply Voltage (max): 6V
• Operating Supply Voltage (typ): 3.3/5V
• Operating Temperature (max): 125C
• Technology: CMOS
• Abs. Propagation Delay Time: 295ns
• Operating Supply Voltage (min): 3V
• Lead Free Status / RoHS Status: Compliant

INPUTS
A1, A2 (Pins 4, 12)
either of these pins triggers the corresponding multivibrator
when there is a high level on the B1 or B2 input.
B1, B2 (Pins 5, 11)
either of these pins triggers the corresponding multivibrator
when there is a low level on the A1 or A2 input.
Reset 1, Reset 2 (Pins 3, 13)
one of these pins, the Q output of the corresponding
multivibrator is reset to a low level and the Q output is set to
a high level.
C
common points of the external timing resistors and
X
A
B
Positive−edge trigger inputs. A rising−edge signal on
Negative−edge trigger inputs. A falling−edge signal on
Reset inputs (active low). When a low level is applied to
External timing components. These pins are tied to the
1/R
X
1 and C
RESET
X
2/R
V
CC
X
2 (Pins 2 and 14)
M2
V
CC
M1
M3
2 kW
POWER
RESET
ON
RxCx
Figure 11. Logic Detail (1/2 the Device)
REFERENCE
REFERENCE
CIRCUIT
CIRCUIT
LOWER
UPPER
TRIGGER
CONTROL CIRCUIT
LOWER
−
+
−
+
UPPER
V
V
re
PIN DESCRIPTIONS
re
,
http://onsemi.com
MC74HC4538A
,
C
CB
R
Q
9
capacitors (see the Block Diagram). Polystyrene capacitors
are recommended for optimum pulse width control.
Electrolytic capacitors are not recommended due to high
leakages associated with these type capacitors.
GND (Pins 1 and 15)
to ground through these pins.
OUTPUTS
Q1, Q2 (Pins 6, 10)
low) pulse high when the multivibrator is triggered at either
the A or the B input. The width of the pulse is determined by
the external timing components, R
Q1, Q2 (Pins 7, 9)
pulse low when the multivibrator is triggered at either the A
or the B input. These outputs are the inverse of Q1 and Q2.
OUTPUT
External ground. The external timing capacitors discharge
Noninverted monostable outputs. These pins (normally
Inverted monostable outputs. These pins (normally high)
LATCH
RESET LATCH
TRIGGER CONTROL
RESET CIRCUIT
X
and C
X
.
Q
Q