MOTOROLA MC74HC4538AN, MC74HC4538DTEL, MC74HC4538AFR2, MC74HC4538AFEL, MC74HC4538AFL1 Datasheet

MC74HC4538A

Dual Precision

Monostable Multivibrator

(Retriggerable, Resettable)

The MC74HC4538A is identical in pinout to the MC14538B. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LSTTL outputs.

This dual monostable multivibrator may be triggered by either the positive or the negative edge of an input pulse, and produces a precision output pulse over a wide range of pulse widths. Because the device has conditioned trigger inputs, there are no trigger±input rise and fall time restrictions. The output pulse width is determined by the external timing components, Rx and Cx. The device has a reset function which forces the Q output low and the Q output high, regardless of the state of the output pulse circuitry.

•Unlimited Rise and Fall Times Allowed on the Trigger Inputs

•Output Pulse is Independent of the Trigger Pulse Width

•± 10% Guaranteed Pulse Width Variation from Part to Part (Using the Same Test Jig)

•Output Drive Capability: 10 LSTTL Loads

•Outputs Directly Interface to CMOS, NMOS and TTL

•Operating Voltage Range: 3.0 to 6.0 V

•Low Input Current: 1.0 μA

•High Noise Immunity Characteristic of CMOS Devices

•In Compliance with the Requirements Defined by JEDEC Standard No. 7A

•Chip Complexity: 145 FETs or 36 Equivalent Gates

LOGIC DIAGRAM

			CX1	RX1	VCC
			1	2
	TRIGGER	A1	4	6	Q1
			5
	INPUTS	B1		7	Q1
	RESET 1 3			CX2	RX2

VCC

			15	14
	TRIGGER	A2	12	10	Q2
			11
	INPUTS	B2		9	Q2
PIN 16 = VCC	RESET 2		13
PIN 8 = GND

RX AND CX ARE EXTERNAL COMPONENTS

PIN 1 AND PIN 15 MUST BE HARD WIRED TO GND

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			MARKING
			DIAGRAMS
			16
		PDIP±16	MC74HC4538AN
		N SUFFIX
	16		AWLYYWW
		CASE 648
	1		1
			16
		SO±16	HC4538A
		D SUFFIX
	16		AWLYWW
		CASE 751B
	1
			1
	A	= Assembly Location
	WL	= Wafer Lot
	YY	= Year

WW = Work Week

PIN ASSIGNMENT

GND				1	16		VCC
CX1/RX1				2	15		GND
RESET 1				3	14		CX2/RX2
	A1			4	13		RESET 2
	B1			5	12		A2
Q1				6	11		B2
				7	10		Q2
	Q1
GND				8	9
							Q2

FUNCTION TABLE

	Inputs		Outputs
Reset	A	B	Q
				Q
H		H
H	L
H	X	L	Not Triggered
H	H	X	Not Triggered
H	L,H,	H	Not Triggered
H	L	L,H,	Not Triggered
L	X	X	L	H
	X	X	Not Triggered

ORDERING INFORMATION

Device	Package	Shipping
MC74HC4538AN	PDIP±16	2000 / Box
MC74HC4538AD	SOIC±16	48 / Rail
MC74HC4538ADR2	SOIC±16	2500 / Reel

Semiconductor Components Industries, LLC, 2000	1	Publication Order Number:
March, 2000 ± Rev. 7		MC74HC4538A/D

MC74HC4538A

MAXIMUM RATINGS*

Symbol	Parameter		Value	Unit
VCC	DC Supply Voltage (Referenced to GND)		± 0.5 to + 7.0	V
Vin	DC Input Voltage (Referenced to GND)		± 1.5 to VCC + 1.5	V
Vout	DC Output Voltage (Referenced to GND)		± 0.5 to VCC + 0.5
Iin	DC Input Current, per Pin	A, B, Reset	± 20	mA
		Cx, Rx	± 30
Iout	DC Output Current, per Pin		± 25	mA
ICC	DC Supply Current, VCC and GND Pins		± 50	mA
PD	Power Dissipation in Still Air,	Plastic DIP²	750	mW
	SOIC Package²		500
Tstg	Storage Temperature		± 65 to + 150	_C
TL	Lead Temperature, 1 mm from Case for 10 Seconds			_C
	(Plastic DIP or SOIC Package)		260

This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high±impedance circuit. For proper operation, Vin and Vout should be constrained to the

range GND v (Vin or Vout) v VCC. Unused inputs must always be

tied to an appropriate logic voltage level (e.g., either GND or VCC). Unused outputs must be left open.

*Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions.

²Derating Ð Plastic DIP: ± 10 mW/ _C from 65_ to 125_C SOIC Package: ± 7 mW/_C from 65_ to 125_C

For high frequency or heavy load considerations, see Chapter 2 of the ON Semiconductor High±Speed CMOS Data Book (DL129/D).

RECOMMENDED OPERATING CONDITIONS

Symbol	Parameter			Min	Max	Unit
VCC	DC Supply Voltage (Referenced to GND)			3.0**	6.0	V
Vin, Vout	DC Input Voltage, Output Voltage (Referenced to GND)			0	VCC	V
TA	Operating Temperature, All Package Types			± 55	+ 125	_C
tr, tf	Input Rise and Fall Time	VCC = 2.0	V	0	1000	ns
	(Figure 7)	VCC = 4.5	V	0	500
		VCC = 6.0 V		0	400
	A or B (Figure 5)			Ð	No Limit
Rx	External Timing Resistor	VCC < 4.5	V	1.0	*	kΩ
		VCC ≥ 4.5	V	2.0	*
Cx	External Timing Capacitor			0	*	μF

*The maximum allowable values of Rx and Cx are a function of the leakage of capacitor Cx, the leakage of the HC4538A, and leakage due to board layout and surface resistance. For most applications, Cx/Rx should be limited to a maximum value of 10 μF/1.0 MΩ. Values of Cx > 1.0 μF may cause a problem during power down (see Power Down Considerations). Susceptibility to externally induced noise signals may occur for Rx > 1.0 MΩ.

**The HC4538A will function at 2.0 V but for optimum pulse width stability, VCC should be above 3.0 V.

NOTE: Information on typical parametric values can be found in Chapter 2 of the ON Semiconductor High±Speed CMOS Data Book (DL129/D).

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MC74HC4538A

DC CHARACTERISTICS FOR THE MC54/74HC4538A

						Guaranteed Limits
				± 55 to
			VCC	25_C			v 85_C			v 125_C
Symbol	Parameter	Test Conditions	Volts	Min	Max		Min	Max		Min	Max	Unit
VIH	Minimum High±Level	Vout = 0.1 V or VCC ± 0.1 V	2.0	1.5			1.5			1.5		V
	Input Voltage	|Iout| v 20 μA	4.5	3.15			3.15			3.15
			6.0	4.2			4.2			4.2
VIL	Maximum Low±Level	Vout = 0.1 V or VCC ± 0.1 V	2.0		0.5			0.5			0.5	V
	Input Voltage	|Iout| v 20 μA	4.5		1.35			1.35			1.35
			6.0		1.8			1.8			1.8
VOH	Minimum High±Level	Vin = VIH or VIL	2.0	1.9			1.9			1.9		V
	Output Voltage	|Iout| v 20 μA	4.5	4.4			4.4			4.4
			6.0	5.9			5.9			5.9
		Vin = VIH or VIL
		|Iout| v ± 4.0 mA	4.5	3.98			3.84			3.7
		|Iout| v ± 5.2 mA	6.0	5.48			5.34			5.2
VOL	Maximum Low±Level	Vin = VIH or VIL	2.0		0.1			0.1			0.1	V
	Output Voltage	|Iout| v 20 μA	4.5		0.1			0.1			0.1
			6.0		0.1			0.1			0.1
		Vin = VIH or VIL
		|Iout| v 4.0 mA	4.5		0.26			0.33			0.4
		|Iout| v 5.2 mA	6.0		0.26			0.33			0.4
Iin	Maximum Input	Vin = VCC or GND	6.0		± 0.1			± 1.0			± 1.0	μA
	Leakage Current
	(A, B, Reset)
Iin	Maximum Input	Vin = VCC or GND	6.0		± 50			± 500			± 500	nA
	Leakage Current
	(Rx, Cx)
ICC	Maximum Quiescent	Vin = VCC or GND	6.0		130			220			350	μA
	Supply Current	Q1 and Q2 = Low
	(per package)	Iout = 0 μA
	Standby State
ICC	Maximum Supply	Vin = VCC or GND					± 45_C to			± 55_C to
	Current	Q1 and Q2 = High		25_C			85_C			125_C
	(per package)	Iout = 0 μA
	Active State	Pins 2 and 14 = 0.5 VCC	6.0		400			600			800	μA

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MC74HC4538A

AC CHARACTERISTICS FOR THE MC54/74HC4538A (CL = 50 pF, Input tr = tf = 6.0 ns)

						Guaranteed Limits
				± 55 to
			VCC	25_C			v 85_C			v 125_C
Symbol	Parameter		Volts	Min	Max		Min	Max		Min	Max	Unit
tPLH	Maximum Propagation Delay		2.0		175			220			265	ns
	Input A or B to Q		4.5		35			44			53
	(Figures 6 and 8)		6.0		30			37			45
tPHL	Maximum Propagation Delay		2.0		195			245			295	ns
	Input A or B to NQ		4.5		39			49			59
	(Figures 6 and 8)		6.0		33			42			50
tPHL	Maximum Propagation Delay		2.0		175			220			265	ns
	Reset to Q		4.5		35			44			53
	(Figures 7 and 8)		6.0		30			37			45
tPLH	Maximum Propagation Delay		2.0		175			220			265	ns
	Reset to NQ		4.5		35			44			53
	(Figures 7 and 8)		6.0		30			37			45
tTLH	Maximum Output Transition Time, Any Output		2.0		75			95			110	ns
tTHL	(Figures 7 and 8)		4.5		15			19			22
			6.0		13			16			19
Cin	Maximum Input Capacitance	(A. B, Reset)	Ð		10			10			10	pF
		(Cx, Rx)			25			25			25

NOTE: For propagation delays with loads other than 50 pF, and information on typical parametric values, see Chapter 2 of the ON Semiconductor High±Speed CMOS Data Book (DL129/D).

		Typical @ 25°C, VCC = 5.0 V
CPD	Power Dissipation Capacitance (Per Multivibrator)*	150	pF

*Used to determine the no±load dynamic power consumption: PD = CPD VCC2f + ICC VCC. For load considerations, see Chapter 2 of the ON Semiconductor High±Speed CMOS Data Book (DL129/D).

TIMING CHARACTERISTICS FOR THE MC54/74HC4538A (Input tr = tf = 6.0 ns)

					Guaranteed Limits
			± 55 to
		VCC	25_C			v 85_C			v 125_C
Symbol	Parameter	Volts	Min	Max		Min	Max		Min	Max	Unit
trec	Minimum Recovery Time, Inactive to A or B	2.0	0			0			0		ns
	(Figure 7)	4.5	0			0			0
		6.0	0			0			0
tw	Minimum Pulse Width, Input A or B	2.0	60			75			90		ns
	(Figure 6)	4.5	12			15			18
		6.0	10			13			15
tw	Minimum Pulse Width, Reset	2.0	60			75			90		ns
	(Figure 7)	4.5	12			15			18
		6.0	10			13			15
tr, tf	Maximum Input Rise and Fall Times, Reset	2.0		1000			1000			1000	ns
	(Figure 7)	4.5		500			500			500
		6.0		400			400			400
	A or B	2.0
	(Figure 7)	4.5				No Limit
		6.0

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