ON Semiconductor 74FST3245QSR, 74FST3245QS, 74FST3245DWR2, 74FST3245DW, 74FST3245DTR2 Datasheet

74FST3245

8-Bit Bus Switch

The ON Semiconductor 74FST3245 is an 8±bit, high performance switch. The device is CMOS TTL compatible when operating between 4 and 5.5 Volts. The device exhibits extremely low RON and adds nearly zero propagation delay. The device adds no noise or ground bounce to the system.

The device consists of an 8±bit switch. Port A is connected to Port B when OE is low. If OE is high, the switch is high Z.

•RON 4 Typical

•Less Than 0.25 ns±Max Delay Through Switch

•Nearly Zero Standby Current

•No Circuit Bounce

•Control Inputs are TTL/CMOS Compatible

•Pin±For±Pin Compatible with QS3245, FST3245, CBT3245

•All Popular Packages: QSOP±20, TSSOP±20, SOIC±20

			NC		1				20					VCC
			A0		2				19					OE
			A1		3				18					B0
			A2		4				17					B1
			A3		5				16					B2
			A4		6				15					B3
			A5		7				14					B4
			A6		8				13					B5
			A7		9				12					B6
			GND		10				11					B7
			Figure 1. 20±Lead Pinout
			19
OE
A	0		2												18	B
											0

9								11
A7									B7
	Figure 2. Logic Diagram
TRUTH TABLE
	Input	OE				Function
	L					Connect
	H					Disconnect

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			MARKING
	20		DIAGRAMS
		20
	1		FST3245
	SO±20
			AWLYYWW
	DW SUFFIX
	CASE 751D
		1
	20	20
	1		FST
			3245
	TSSOP±20
			ALYW
	DT SUFFIX
	CASE 948E
		1
	20	20
			FST3245
	1		AWLYWW
	QSOP±20	1
	QS SUFFIX
	CASE 492A
	A	= Assembly Location
	L, WL	= Wafer Lot
	Y	= Year
	W, WW = Work Week
	PIN NAMES
	Pin		Description
	OE1, OE2	Bus Switch Enables
	1A, 2A		Bus A
	1B, 2B		Bus B
	ORDERING INFORMATION
	Device	Package	Shipping
	74FST3245DW	SO±20	38 Units/Rail
	74FST3245DWR2	SO±20	1000 Units/Reel
	74FST3245DT	TSSOP±20	75 Units/Rail
	74FST3245DTR2	TSSOP±20	2500 Units/Reel
	74FST3245QS	QSOP±20	55 Units/Rail
	74FST3245QSR	QSOP±20	2500 Units/Reel

Semiconductor Components Industries, LLC, 2001	1	Publication Order Number:
August, 2001 ± Rev. 0		74FST3245/D

74FST3245

MAXIMUM RATINGS

Symbol		Parameter	Value	Unit
VCC	DC Supply Voltage		±0.5 to 7.0	V
VI	DC Input Voltage		±0.5 to 7.0	V
VO	DC Output Voltage		±0.5 to 7.0	V
IIK	DC Input Diode Current	VI GND	±50	mA
IOK	DC Output Diode Current	VO GND	±50	mA
IO	DC Output Sink Current		128	mA
ICC	DC Supply Current per Supply Pin		100	mA
IGND	DC Ground Current per Ground Pin		100	mA
TSTG	Storage Temperature Range		±65 to 150	C
TL	Lead Temperature, 1 mm from Case for 10 Seconds		260	C
TJ	Junction Temperature Under Bias		150	C
JA	Thermal Resistance (Note 1)	SOIC	96	C/W
		TSSOP	128
		QSOP	200
MSL	Moisture Sensitivity		Level 1
FR	Flammability Rating	Oxygen Index: 28 to 34	UL 94 V±0 @ 0.125 in
VESD	ESD Withstand Voltage	Human Body Model (Note 2)	2000	V
		Machine Model (Note 3)
			200
ILATCH±UP	Latch±Up Performance	Above VCC and Below GND at 85 C (Note 4)	500	mA

Maximum Ratings are those values beyond which damage to the device may occur. Exposure to these conditions or conditions beyond those indicated may adversely affect device reliability. Functional operation under absolute maximum±rated conditions is not implied. Functional operation should be restricted to the Recommended Operating Conditions.

1.Measured with minimum pad spacing on an FR4 board, using 10 mm±by±1 inch, 2±ounce copper trace with no air flow.

2.Tested to EIA/JESD22±A114±A.

3.Tested to EIA/JESD22±A115±A.

4.Tested to EIA/JESD78.

RECOMMENDED OPERATING CONDITIONS

Symbol		Parameter	Min	Max	Unit
VCC	Supply Voltage	Operating, Data Retention Only	4.0	5.5	V
VI	Input Voltage	(Note )	0	5.5	V
VO	Output Voltage	(HIGH or LOW State)	0	VCC	V
TA	Operating Free±Air Temperature		±40	85	C
t/ V	Input Transition Rise or Fall Rate	Switch Control Input	0	5	ns/V
		Switch I/O	0	DC

5. Unused control inputs may not be left open. All control inputs must be tied to a high or low logic input voltage level.

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74FST3245

DC ELECTRICAL CHARACTERISTICS

			VCC	TA = ±40 C to 85 C
Symbol	Parameter	Conditions	(V)	Min	Typ*	Max	Unit
VIK	Clamp Diode Resistance	IIN = ±18mA	4.5			±1.2	V
VIH	High±Level Input Voltage		4.0 to 5.5	2.0			V
VIL	Low±Level Input Voltage		4.0 to 5.5			0.8	V
II	Input Leakage Current	0 VIN 5.5 V	5.5			1.0	A
IOZ	OFF±STATE Leakage Current	0 A, B VCC	5.5			1.0	A
RON	Switch On Resistance (Note 6)	VIN = 0 V, IIN = 64 mA	4.5		4	7
		VIN = 0 V, IIN = 30 mA	4.5		4	7
		VIN = 2.4 V, IIN = 15 mA	4.5		8	15
		VIN = 2.4 V, IIN = 15 mA	4.0		11	20
ICC	Quiescent Supply Current	VIN = VCC or GND, IOUT = 0	5.5			3	A
ICC	Increase In ICC per Input	One input at 3.4 V, Other inputs at VCC or GND	5.5			2.5	mA

*Typical values are at VCC = 5.0 V and TA = 25 C.

6. Measured by the voltage drop between A and B pins at the indicated current through the switch.

AC ELECTRICAL CHARACTERISTICS

						Limits
					TA = ±40 C to 85 C
				VCC = 4.5 to 5.5 V				VCC = 4.0 V
Symbol	Parameter	Conditions	Figures	Min		Max		Min	Max	Unit
tPHL,	Prop Delay Bus to Bus	VI = OPEN	3 and 4			0.25			0.25	ns
tPLH	(Note 7)
tPZH,	Output Enable Time	VI = 7 V for tPZL	3 and 4	1.5		5.9			6.4	ns
tPZL		VI = OPEN for tPZH
tPHZ,	Output Disable Time	VI = 7 V for tPLZ	3 and 4	1.5		6.0			5.7	ns
tPLZ		VI = OPEN for tPHZ

7.This parameter is guaranteed by design but is not tested. The bus switch contributes no propagation delay other than the RC delay of the typical On resistance of the switch and the 50 pF load capacitance, when driven by an ideal voltage source (zero output impedance).

CAPACITANCE (Note 8)

Symbol	Parameter				Conditions	Typ	Max	Unit
CIN	Control Pin Input Capacitance	VCC = 5.0 V				3		pF
CI/O	Input/Output Capacitance	VCC,		= 5.0 V		5		pF
			OE

8. TA = 25 C, f = 1 MHz, Capacitance is characterized but not tested.

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