ST 74LCX16244A User Manual

74LCX16244A

74LCX16244A

LOW VOLTAGE CMOS 16-BIT BUS BUFFER (3-STATE) WITH 5V TOLERANT INPUTS AND OUTPUTS

■5V TOLERANT INPUTS AND OUTPUTS

■HIGH SPEED:

tPD = 5.2 ns (MAX.) at VCC = 3.0V

■POWER-DOWN PROTECTION ON INPUTS AND OUTPUTS

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

■PCI BUS LEVELS GUARANTEED AT 24mA

■BALANCED PROPAGATION DELAYS:

tPLH tPHL

■OPERATING VOLTAGE RANGE:

VCC (OPR) = 2.7V to 3.6V (1.5V Data Retention)

■PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 16244

■LATCH-UP PERFORMANCE EXCEEDS 500mA

■ESD PERFORMANCE:

HBM >2000V; MM > 200V

DESCRIPTION

The LCX16244A is a low voltage CMOS 16-BIT BUS BUFFER (NON-INVERTED) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. It is ideal for low power and high speed 3.3V applications; it can be interfaced to 5V signal environment for both inputs and outputs.

Any nG output control governs four BUS BUFFERS. Output Enable input (nG) tied together gives full 16-bit operation.

When nG is LOW, the outputs are on. When nG is HIGH, the output are in high impedance state. This device is designed to be used with 3 state memory address drivers, etc.

It has better speed performance at 3.3V than 5V LSTTL family combined with the true CMOS low power consumption.

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

T

(TSSOP48 Package)

ORDER CODES :

74LCX16244AT

PIN CONNECTION

February 1999

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74LCX16244A

INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION			IEC LOGIC SYMBOLS
PIN No		SYMBOL	NAME AND FUNCT ION
1		1G	Output Enable Input
2, 3, 5,	6	1Y1 to 1Y4	Data Outputs
8, 9, 11,	12	2Y1 to 2Y4	Data Outputs
13, 14, 16, 17		3Y1 to 3Y4	Data Outputs
19, 20, 22, 23		4Y1 to 4Y4	Data Outputs

244G Output Enable Input

253G Output Enable Input

30, 29, 27, 26	4A1 to 4A4	Data Inputs
36, 35, 33, 32	3A1 to 3A4	Data Inputs
41, 40, 38, 37	2A1 to 2A4	Data Inputs
47, 46, 44, 43	1A1 to 1A4	Data Inputs
48	2G	Output Enable Input
4,10, 15, 21,	GND	Ground (0V)
28, 34, 39, 45
7, 18, 31, 42	VCC	Positive Supply Voltage

TRUTH TABLE

	INPUT	OUTPUT
G	An	Yn
L	L	L
L	H	H
H	X	Z
X:ºHº or ºLº
Z: High impedance

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			74LCX16244A
ABSOLUTE MAXIMUM RATINGS
Symbol	Parameter	Val ue	Unit
VCC	Supply Voltage	-0.5 to + 7.0	V
VI	DC Input Voltage	-0.5 to + 7.0	V
VO	DC Output Voltage (OFF state)	-0.5 to + 7.0	V
VO	DC Output Voltage (High or Low State) (note1)	-0.5 to VCC + 0.5	V
IIK	DC Input Diode Current	- 50	mA
IOK	DC Output Diode Current (note2)	± 50	mA
IO	DC Output Source/Sink Current	± 50	mA
ICC orIGND	DC VCC or Ground Current Per Supply Pin	± 100	mA
Tstg	Storage Temperature	-65 to +150	oC
TL	Lead Temperature (10 sec)	300	oC

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

1)IO absolute maximum rating must be observed

2)VO < GND, VO > VCC

RECOMMENDED OPERATING CONDITIONS

Symbol	Parameter		Value	Unit
VCC	Supply Voltage (note 1)		2.0 to 3.6	V
VI	Input Voltage		0 to 5.5	V
VO	Output Voltage (OFF state)		0 to 5.5	V
VO	Output Voltage (High or Low State)		0 to VCC	V
IOH, IOL	High or Low Level Output Current (VCC =	3.0 to 3.6V)	± 24	mA
IOH, IOL	High or Low Level Output Current (VCC =	2.7 to 3.0V)	± 12	mA
Top	Operating Temperature:		-40 to+85	oC
dt/dv	Input Transition Rise or Fall Rate (VCC = 3.0V) (note 2)		0 to 10	ns/V

1)Truth Table guaranteed: 1.5V to3.6V

2)VIN from0.8V to 2.0V

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