ST 74LVXC4245 User Manual

74LVXC4245

OCTAL DUAL SUPPLY BUS TRANSCEIVER

■HIGH SPEED:

tPD = 6.5ns (MAX.) at VCCA = 5.0V, VCCB = 5.0V

■LOW POWER DISSIPATION:

ICCA = ICCB = 5 A(MAX.) at TA=25°C

■LOW NOISE: VOLP =0.3V (TYP.) at VCCA=5.0V VCCB =3.3V

■SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24mA (MIN)

■BALANCED PROPAGATION DELAYS: tPLH tPHL

■OPERATING VOLTAGE RANGE:

VCCA(OPR)= 4.5V to 5.5V (1.2V Data Retention) VCCB(OPR)= 2.7V to 5.5V (1.2V Data Retention) PIN AND FUNCTION COMPATIBLE WITH

74 SERIES C4245

■IMPROVED LATCH-UP IMMUNITY

DESCRIPTION

The 74LVXC4245 is a dual supply 8 bit configurable low voltage CMOS OCTAL BUS TRANSCEIVER fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. Designed for use as an interface between a 5V bus and a 3.3V to 5V bus in a mixed 5V/3.3V supply systems, it achieves high speed operation while maintaining the CMOS low power dissipation.

SOP		TSSOP
Table 1: Order Codes
PACKAGE		T & R
SOP		74LVXC4245MTR
TSSOP		74LVXC4245TTR

This IC is intended for two-way asynchronous communication between data buses and the direction of data transmission is determined by DIR input. The enable input G can be used to disable the device so that the buses are effectively isolated.

The A-port interfaces with the 5V bus, the B-port with the 3.3V to 5V bus.

All inputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.

Figure 1: Pin Connection And IEC Logic Symbols

August 2004	Rev. 4
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74LVXC4245

Figure 2: Input And Output Equivalent Circuit	Table 2: Pin Description
	PIN N°	SYMBOL	NAME AND FUNCTION
	2	DIR	Directional Control
	3, 4, 5, 6, 7,	A1 to A8	Data Inputs/Outputs
	8, 9, 10
	21, 20, 19,	B1 to B8	Data Inputs/Outputs
	18, 17, 16,
	15, 14
	22	G	Output Enable Input
	11, 12, 13	GND	Ground (0V)
	23	NC	Not Connected
	1	VCCA	Positive Supply Voltage
	24	VCCB	Positive Supply Voltage

Table 3: Truth Table

			INPUTS			FUNCTION		OUTPUT
	G			DIR	A BUS		B BUS
	L			L	OUTPUT		INPUT	A = B
	L			H	INPUT		OUTPUT	B = A
	H			X	Z		Z	Z
X : Don’t Care
Z : High Impedance
Table 4: Absolute maximum ratings

Symbol	Parameter	Value		Unit
VCCA	Supply Voltage	-0.5 to +7.0		V
VCCB	Supply Voltage	-0.5 to +7.0		V
VI	DC Input Voltage	-0.5 to VCCA + 0.5		V
VI/OA	DC I/O Voltage	-0.5 to VCCA + 0.5		V
VI/OB	DC I/O Voltage	-0.5 to VCCB + 0.5		V
IIK	DC Input Diode Current	±	20	mA
IOK	DC Output Diode Current	±	50	mA
IOA	DC Output Current	±	50	mA
IOB	DC Output Current	±	50	mA
ICCA	DC VCC or Ground Current	±	200	mA
ICCB	DC VCC or Ground Current	±	100	mA
Pd	Power Dissipation	180		mW
Tstg	Storage Temperature	-65 to +150		°C
TL	Lead Temperature (10 sec)	300		°C

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied

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			74LVXC4245
Table 5: Recommended Operating Conditions
Symbol	Parameter	Value		Unit
VCCA	Supply Voltage (note 1)	4.5 to 5.5		V
VCCB	Supply Voltage (note 1)	2.7 to 5.5		V
VI	Input Voltage	0 to VCCA		V
VI/OA	I/O Voltage	0 to VCCA		V
VI/OB	I/O Voltage	0 to VCCB		V
Top	Operating Temperature	-40 to 85		°C
dt/dv	Input Rise and Fall Time (note 2)	0 to 10		ns/V

1)VIN from 30% to 70% of VCC

2)VCCA = 4.5 to 5.5V; VCCB = 2.7 to 3.6V;

Table 6: DC Specifications For VCCA

			Test Condition									Value
Symbol	Parameter	VCCA	VCCB					TA = 25 °C				-40 to 85 °C			-55 to 125°C			Unit
		(V)	(V)				Min.		Typ.	Max.		Min.	Max.		Min.	Max.
VIHA	High Level Input	4.5	2.7				2.0					2.0			2.0
	Voltage	4.5	3.6				2.0					2.0			2.0			V
		5.5	5.5				2.0					2.0			2.0
VILA	Low Level Input	4.5	2.7								0.8		0.8			0.8
	Voltage	4.5	3.6								0.8		0.8			0.8		V
		5.5	5.5								0.8		0.8			0.8
VOHA	High Level	4.5	3.0	IO=-100 A			4.4		4.5			4.4			4.4			V
	Output Voltage
		4.5	3.0	IO=-24 mA			3.86					3.76			3.76
VOLA	Low Level Output	4.5	3.0	IO=100 A					0		0.1		0.1			0.1		V
	Voltage
		4.5	3.0	IO=24 mA						0.36			0.44			0.44
IIA	Input Leakage	5.5	3.6	VI = VCC or GND						±	0.1		±	1		±	1	A
	Current
IOZA	High Impedance	5.5	3.6	VIA = VIHA or VILA						±	0.5		±	5		±	5	A
	Output Leakage			VIB = VIHB or VILB
	Current			VI/OA = VCCA or
				GND
ICCtA	Quiescent Supply	5.5	3.6	VIA = VCCA or							5		50			50		A
	Current			GND
				VIB = VCCB or
				GND
ICCtAF	Quiescent VCCA	5.5	Open	VIA = VCCA or							5		50			50		A
	Supply Current			GND
					G= DIR =
	as B Port Floats			VCCA
				VIB = Open
∆ ICCtA	Maximum	5.5	5.5	VIA = VCCA - 2.1V						1.35			1.5			1.5		mA
	Quiescent Supply			VIB = VCCB or
	Current / Input			GND
	(An, DIR, G)

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74LVXC4245

Table 7: DC Specifications For VCCB

			Test Condition						Value
Symbol	Parameter	VCCA	VCCB		TA = 25 °C				-40 to 85 °C			-55 to 125°C			Unit
		(V)	(V)		Min.	Typ.	Max.		Min.	Max.		Min.	Max.
VIHB	High Level Input	4.5	2.7		2.0				2.0			2.0
	Voltage	4.5	3.6		2.0				2.0			2.0			V
		4.5	5.5		3.85				3.85			3.85
VILB	Low Level Input	4.5	2.7					0.8		0.8			0.8
	Voltage	4.5	3.6					0.8		0.8			0.8		V
		4.5	5.5				1.65			1.65			1.65
VOHB	High Level	4.5	3.0	IO=-100 A	2.9	3.0			2.9			2.9
	Output Voltage
		4.5	3.0	IO=-12 mA	2.56	2.85			2.46			2.46
		4.5	3.0	IO=-24 mA	2.35	2.65			2.25			2.25			V
		4.5	2.7	IO=-12 mA	2.3	2.5			2.2			2.2
		4.5	2.7	IO=-24 mA	2.1	2.3			2.0			2.0
		4.5	4.5	IO=-24 mA	3.86	4.25			3.76			3.76
VOLB	Low Level Output	4.5	3.0	IO=100 A		0.0		0.1		0.1			0.1
	Voltage
		4.5	3.0	IO=24 mA		0.21	0.36			0.44			0.44
		4.5	2.7	IO=12 mA		0.11	0.36			0.44			0.44		V
		4.5	2.7	IO=24 mA		0.22	0.42			0.50			0.50
		4.5	4.5	IO=24 mA		0.18	0.36			0.44			0.44
IIB	Input Leakage	5.5	5.5	VI = VCCA or GND			±	0.1		±	1		±	1	A
	Current
IOZB	High Impedance	5.5	5.5	VIA = VIHA or VILA			±	0.5		±	5		±	5	A
	Output Leakage			VI/Ob = VCCb or
	Current			GND
ICCtB	Quiescent Supply	5.5	5.5	VIA = VCCA or				5		50			50		A
	Current			GND
				VIB = VCCB or
				GND
∆ ICCtB	Maximum	5.5	3.6	VIA = VCCA or			0.35			0.5			0.5		mA
	Quiescent Supply			GND
	Current / Input			VIB = VCCB - 0.6V

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74LVXC4245

Table 8: Dynamic Switching Characteristics

Test Condition

Value

Symbol

Parameter

VCCA

VCCB

TA = 25 °C

-40 to 85 °C

-55 to 125°C

Unit

(V)

(V)

Min.

Typ.

Max.

Min.

Max.

Min.

Max.

VOLPA

Dynamic Low

5.0

3.3

1.0

1.5

Level Quiet

5.0

3.3

-1.2

-0.6

V

Output (note 1, 2)

VOLPB

Dynamic Low

5.0

3.3

0.8

1.2

Level Quiet

5.0

3.3

-0.8

-0.5

V

Output (note 1, 2)

VIHDA

Dynamic High

5.0

3.3

2

V

Voltage Input

(note 1, 3)

VILDA

Dynamic Low

5.0

3.3

0.8

V

Voltage Input

(note 1, 3)

VIHDB

Dynamic High

5.0

3.3

2

V

Voltage Input

(note 1, 3)

VILDB

Dynamic Low

5.0

3.3

0.8

V

Voltage Input

(note 1, 3)

1)Worst case package

2)Max number of output defined as (n). Data inputs are driven 0V to 3.3V, (n-1) outputs switching and one output at GND

3)Max number of data inputs (n) switching. (n-1) switching 0V to 3.3V. Inputs under test switching: 3V to threshold (VILD). 0V to threshold (VIHD) f = 1MHz

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