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74LVCH322244AZKER Datasheet(PDF) 1 Page - Texas Instruments

Part # 74LVCH322244AZKER
Description  32-BIT BUFFER/DRIVER WITH 3-STATE OUTPUTS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

74LVCH322244AZKER Datasheet(HTML) 1 Page - Texas Instruments

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FEATURES
DESCRIPTION/ORDERING INFORMATION
SN74LVCH322244A
32-BIT BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCES405B – JULY 2002 – REVISED APRIL 2005
Ioff Supports Partial-Power-Down Mode
Operation
Member of the Texas Instruments Widebus+™
Family
Supports Mixed-Mode Signal Operation
On All Ports (5-V Input/Output Voltage With
Operates From 1.65 V to 3.6 V
3.3-V VCC)
Inputs Accept Voltages to 5.5 V
Bus Hold on Data Inputs Eliminates the
Max tpd of 4.4 ns at 3.3 V
Need for External Pullup/Pulldown
Output Ports Have Equivalent 26-
Ω Series
Resistors
Resistors, So No External Resistors Are
Latch-Up Performance Exceeds 100 mA
Required
Per JESD 78, Class II
Typical VOLP (Output Ground Bounce)
ESD Protection Exceeds JESD 22
< 0.8 V at VCC = 3.3 V, TA = 25°C
– 2000-V Human-Body Model (A114-A)
Typical VOHV (Output VOH Undershoot)
– 200-V Machine Model (A115-A)
> 2 V at VCC = 3.3 V, TA = 25°C
– 1000-V Charged-Device Model (C101)
This 32-bit buffer/driver 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 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.
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 outputs, which are designed to sink up to 12 mA, include equivalent 26-
Ω resistors to reduce overshoot and
undershoot.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC 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 is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
ORDERING INFORMATION
TA
PACKAGE(1)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
LFBGA – GKE
SN74LVCH322244AKR
–40°C to 85°C
Tape and reel
CG244A
LFBGA – ZKE (Pb-free)
74LVCH322244AZKER
(1)
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
FUNCTION TABLE
(EACH 4-BIT BUFFER)
INPUTS
OUTPUT
Y
OE
A
L
H
H
L
L
L
H
X
Z
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Widebus+ is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright © 2002–2005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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