Datasheet

SN74AUC244
OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCES432 – MARCH 2003
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Optimized for 1.8-V Operation and is 3.6-V
I/O Tolerant to Support Mixed-Mode Signal
Operation
I
off
Supports Partial-Power-Down Mode
Operation
Sub 1-V Operable
Max t
pd
of 1.9 ns at 1.8 V
Low Power Consumption, 20-µA Max I
CC
±8-mA Output Drive at 1.8 V
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 octal buffer/driver is operational at 0.8-V to 2.7-V V
CC
, but is designed specifically for 1.65-V to 1.95-V V
CC
operation.
The SN74AUC244 is organized as two 4-bit line drivers with separate output-enable (OE
) inputs. When OE is
low, the device passes data from the A inputs to the Y outputs. When OE
is high, the outputs are in the
high-impedance state.
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.
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.
ORDERING INFORMATION
T
A
PACKAGE
†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
–40°C to 85°C QFN – RGY Tape and reel SN74AUC244RGYR MS244
†
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/driver)
INPUTS
OUTPUT
OE A
Y
L H H
L LL
H X Z
Copyright  2003, Texas Instruments Incorporated
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.
RGY PACKAGE
(TOP VIEW)
120
10 11
2
3
4
5
6
7
8
9
19
18
17
16
15
14
13
12
2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
1OE
2A1
V
GND
CC
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.