SN74LVCH322244A Datasheet, PDF (1/11 Pages) Texas Instruments – 32-BIT BUFFER/DRIVER WITH 3-STATE OUTPUTS

www.ti.com
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-Ω Series
Resistors, So No External Resistors Are
Required
• Typical V_OLP (Output Ground Bounce)
< 0.8 V at V_CC = 3.3 V, T_A = 25°C
• Typical V_OHV (Output V_OH Undershoot)
> 2 V at V_CC = 3.3 V, T_A = 25°C
SN74LVCH322244A
32-BIT BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCES405B – JULY 2002 – REVISED APRIL 2005
• 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_CC)
• 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)
DESCRIPTION/ORDERING INFORMATION
This 32-bit buffer/driver is designed for 1.65-V to 3.6-V V_CC 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 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 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.
T_A
–40°C to 85°C
ORDERING INFORMATION
PACKAGE ⁽¹⁾
ORDERABLE PART NUMBER
LFBGA – GKE
LFBGA – ZKE (Pb-free)
Tape and reel
SN74LVCH322244AKR
74LVCH322244AZKER
TOP-SIDE MARKING
CG244A
(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
OE
A
L
H
L
L
H
X
OUTPUT
Y
H
L
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2002–2005, Texas Instruments Incorporated