SN74LVCH322244A

Features:

` Member of the Texas Instruments Widebus+™ Family
` Operates From 1.65 V to 3.6 V
` Inputs Accept Voltages to 5.5 V
` Max t_pd of 4.4 ns at 3.3 V
` Output Ports Have Equivalent 26-W Series Resistors, So No External Resistors Are Required
` Typical VOLP (Output Ground Bounce) < 0.8 V at V_CC = 3.3 V, T_A = 25°C
` Typical VOHV (Output VOH Undershoot) > 2 V at V<sub>CC</sub> = 3.3 V, T<sub>A</sub> = 25°C
` I_off Supports Partial-Power-Down Mode Operation
` Supports Mixed-Mode Signal Operation On All Ports (5-V Input/Output Voltage With 3.3-V V<sub>CC</sub>)
` Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors
` Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
` ESD Protection Exceeds JESD 22 
   2000-V Human-Body Model (A114-A)
   200-V Machine Model (A115-A)
   1000-V Charged-Device Model (C101)


Specifications

		MIN	MAX	UNIT
VCC Supply voltage range		0.5	6.5	V
VI Input voltage range(2)		0.5	6.5	V
VO Voltage range applied to any output in the high-impedance or power-off state(2)		0.5	6.5	V
VO Voltage range applied to any output in the high or low state(2) (3)		0.5	VCC + 0.5	V
IIK Input clamp current	VI < 0	50		mA
IOK Output clamp current	VO < 0		50	mA
IO Continuous output current			±50	mA
Continuous current through each VCC or GND			±100	mA
JA Package thermal impedance(4)	GKE/ZKE package		40	°C/W
Tstg Storage temperature range		65	150	°C

Description

This 32-bit buffer/driver SN74LVCH322244A is designed for 1.65-V to 3.6-V VCC operation.

The SN74LVCH322244A is designed specifically to improve the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters.

The device SN74LVCH322244A can be used as eight 4-bit buffers, four 8-bit buffers, two 16-bit buffers, or one 32-bit buffer. It provides true outputs and symmetrical active-low output-enable (OE) inputs.

SN74LVCH322244A Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators in a mixed 3.3-V/5-V system environment.

The SN74LVCH322244A outputs, which are designed to sink up to 12 mA, include equivalent 26-W resistors to reduce overshoot and undershoot.

To ensure the high-impedance state during power up or power down, SN74LVCH322244A OE should be tied to V_CC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended.

This device SN74LVCH322244A is fully specified for partial-power-down applications using I_off. The I_off circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.