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SN74LVCH322244A

更新时间： 2024-11-03 23:06:23
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德州仪器 - TI 驱动器输出元件
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11页 249K
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32-BIT BUFFER/DRIVER WITH 3-STATE OUTPUTS

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SN74LVCH322244A 数据手册

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SN74LVCH322244A  
32-BIT BUFFER/DRIVER  
WITH 3-STATE OUTPUTS  
www.ti.com  
SCES405B–JULY 2002–REVISED APRIL 2005  
FEATURES  
•
•
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  
Inputs Accept Voltages to 5.5 V  
Max tpd of 4.4 ns at 3.3 V  
3.3-V VCC  
)
•
Bus Hold on Data Inputs Eliminates the  
Need for External Pullup/Pulldown  
Resistors  
Output Ports Have Equivalent 26-Ω Series  
Resistors, So No External Resistors Are  
Required  
•
•
Latch-Up Performance Exceeds 100 mA  
Per JESD 78, Class II  
•
•
Typical VOLP (Output Ground Bounce)  
< 0.8 V at VCC = 3.3 V, TA = 25°C  
ESD Protection Exceeds JESD 22  
– 2000-V Human-Body Model (A114-A)  
– 200-V Machine Model (A115-A)  
Typical VOHV (Output VOH Undershoot)  
> 2 V at VCC = 3.3 V, TA = 25°C  
– 1000-V Charged-Device Model (C101)  
DESCRIPTION/ORDERING INFORMATION  
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  
SN74LVCH322244AKR  
TOP-SIDE MARKING  
LFBGA – GKE  
LFBGA – ZKE (Pb-free)  
–40°C to 85°C  
Tape and reel  
CG244A  
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  
L
A
H
L
H
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.  
1234567...11

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