Fairchild Semiconductor DM74ALS5245WMX, DM74ALS5245WM, DM74ALS5245SJX, DM74ALS5245N Datasheet

October 1986

Revised February 2000

DM74ALS5245

Octal 3-STATE Transceiver

General Description

This octal bus transceiver is designed for asynchronous two-way communication between data buses. The inputs include hysteresis which provides improved noise rejection. Data is transmitted either from the A bus to the B bus or from the B bus to the A bus depending on the logic level of the direction control (DIR) input. The device can be disabled via the enable input (G) which causes the outputs to enter the high impedance mode so the buses are effectively isolated.

Features

■Input Hysteresis

■Low output noise generation

■High input noise immunity

■Advanced oxide-isolated, ion implanted Schottky TTL process

■Switching specification guaranteed over the full temperature and VCC range

■PNP inputs to reduce input loading

Ordering Code:

Order Number	Package Number	Package Description
DM74ALS5245WM	M20B	20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74ALS5245SJ	M20D	20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS5245N	N20A	20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagram

Function Table

		Control Inputs			Operation
		G		DIR
		L		L	B Data to A Bus
		L		H	A Data to B Bus
		H		X	High Impedance
L = LOW Logic Level			H = HIGH Logic Level		X = Don't Care (Either LOW or HIGH Logic Level)

Transceiver STATE-3 Octal DM74ALS5245

© 2000 Fairchild Semiconductor Corporation

DS009175

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DM74ALS5245

Absolute Maximum Ratings(Note 1)

Supply Voltage	7V
Input Voltage
Control Inputs	7V
I/O Ports	5.5V
Operating Free-Air Temperature Range	0°C to +70°C
Storage Temperature Range	−65°C to +150°C
Typical θJA
N Package	56.0°C/W
M Package	74.0°C/W

Note 1: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristic tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation.

Recommended Operating Conditions

Symbol	Parameter	Min	Max	Units
VCC	Supply Voltage	4.5	5.5	V
VIH	HIGH Level Input Voltage	2		V
VIL	LOW Level Input Voltage		0.8	V
IOH	HIGH Level Output Current		−15	mA
IOL	LOW Level Output Current		24	mA
TA	Free Air Operating Temperature Range	0	70	°C

Electrical Characteristics

over recommended free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C.

Symbol	Parameter		Test Conditions			Min	Typ	Max	Units
VIK	Input Clamp Voltage		VCC = Min, II = −18 mA					−1.5	V
HYS	Hysteresis (VT+ − VT−)		VCC = Min			0.2	0.32		V
VOH	HIGH Level		VCC = 4.5V to 5.5V		IOH = −0.4 mA	VCC − 2
	Output Voltage		VCC = Min		IOH = −3 mA	2.4	3.2		V
					IOH = Max	2
VOL	LOW Level		VCC = Min		IOL = 12 mA		0.25	0.4	V
	Output Voltage				IOL = 24 mA		0.35	0.5
II	Input Current at		VCC = Max		I/O Ports, VI = 5.5V			100	μA
	Maximum Input Voltage				Control Inputs, VI = 7V			100
IIH	HIGH Level Input Current		VCC = Max, VI = 2.7V					20	μA
IIL	LOW Level Input Current		VCC = Max, VI = 0.4V					−100	μA
IO	Output Drive Current		VCC = Max, VO = 2.25V			−30		−112	mA
ICC	Supply Current		VCC = Max		Outputs HIGH		30	45
					Outputs LOW		36	55	mA
					Outputs Disabled		38	58
VOLP	Quiet Output Maximum		VCC = 5.0V, TA = 25°C				0.5		V
	Dynamic VOL		(Figures 1, 2; (Note 2)(Note 3))
VOLV	Quiet Output Minimum		VCC = 5.0V, TA = 25°C				−0.2		V
	Dynamic VOL		(Figures 1, 2; (Note 2)(Note 3))
VIHD	Minimum High Level		VCC = 5.0V, TA = 25°C				1.6		V
	Dynamic Input Voltage		(Note 2)(Note 4)
VILD	Maximum Low Level		VCC = 5.0V, TA = 25°C				1.0		V
	Dynamic Input Voltage		(Note 2)(Note 4)

Note 2: Plastic DIP package.

Note 3: n = number of device outputs; n−1 outputs switching, each driven 0V to 3V one output @ GND.

Note 4: n = number of device outputs; n outputs switching, n−1 inputs switching 0V to 3V. Input under test switching 3V to threshold (VILD); 0V to threshold (VIHD); f = 1 MHz.

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Switching Characteristics

over recommended operating free air temperature range

Symbol	Parameter		Conditions	From (Input)			Min	Max	Units
				To (Output)
tPLH	Propagation Delay Time	VCC = 4.5V to 5.5V,		A or B to B or A			3	10	ns
	LOW-to-HIGH Level Output	R1 = R2 = 500Ω,
tPHL	Propagation Delay Time	CL	= 50 pF	A or B to B or A			3	10	ns
	HIGH-to-LOW Level Output
tPZH	Output Enable Time
					G to A or B		5	20	ns
	to HIGH Level Output
tPZL	Output Enable Time
					G to A or B		5	20	ns
	to LOW Level Output
tPHZ	Output Disable Time
					G to A or B		2	10	ns
	from HIGH Level Output
tPLZ	Output Disable Time
					G to A or B		4	15	ns
	from LOW Level Output

DM74ALS5245

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