WITH 3-STATE OUTPUTS (NON INVERTED)
■ HIGH SPEED:
t
= 4.5 ns (TYP.) at VCC=5V
PD
■ LOW POWER DISSIPATION:
I
=8µA (MAX.) at TA=25°C
CC
■ HIGH NOISE IMMUNITY:
V
NIH=VNIL
■ POWER DOWN PROTECTION ON INPUTS
■ SYMMETRICAL OUTPUT IMPEDANCE:
|I
|=IOL=24mA(MIN)
OH
■ BALANCED PROPAGATION DELAYS:
t
≅ t
PLH
■ OPERATING VOLTAGE RANGE:
V
(OPR) = 2V to 6V
CC
■ PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 16244
■ IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The 74AC16244 is an advanced high-speed
CMOS 16-BIT BUS BUFFER (3-STATE) fabricated with sub-micron silicon gate and double-layer
metal wiring C
Any nG
BUFFERS. Output Enable inputs (nG
together give full 16 bit operation.
When nG
nG
is HIGH, the output are in high impedance
state.
The device is designed to be used with 3-state
memory address drivers, etc.
= 28% VCC(MIN.)
PHL
2
MOS tecnology.
output con trol governs four BUS
)tied
is LO W, the outputs are enabled. When
74AC16244
16-BIT BUS BUFFER
TSSOP
ORDER CODES
PACKAGE TUBE T & R
TSSOP 74AC16244TTR
PIN CO NNECTION
1/9February 2003
74AC16244
INPUT AND OUTP UT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCTION
11G
2, 3, 5, 6 1Y1 to 1Y4 Data Outputs
8, 9, 11, 12 2Y1 to 2Y4 Data Outputs
13, 14, 16, 17 3Y1 to 3Y4 Data Outputs
19, 20, 22, 23 4Y1 to 4Y4 Data Outputs
24 4G
25 3G
30, 29, 27, 26 4A1 to 4A4 Data Outputs
36, 35, 33, 32 3A1 to 3A4 Data Outputs
41, 40, 38, 37 2A1 to 2A4 Data Outputs
47, 46, 44, 43 1A1 to 1A4 Data Outputs
48 2G
4, 10, 15, 21,
28, 34, 39, 45
7, 18, 31, 42
GND Ground (0V)
V
CC
Output Enable Input
Output Enable Input
Output Enable Input
Output Enable Input
Positive Supply Voltage
TRUTH TABLE
INPUTS OUTPUT
G
LLL
LHH
HXZ
X : Don’t Care
Z : High Impedance
An Yn
IEC LOGIC SYMBOLS
2/9
74AC16244
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
V
I
I
OK
I
or I
I
CC
T
T
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Value Unit
V
V
V
T
dt/dv Input Rise and Fall Time (note 1) V
1) VINfrom30% to 70%of V
Supply Voltage
CC
DC Input Voltage
I
DC Output Voltage -0.5 to VCC+ 0.5
O
DC Input Diode Current
IK
DC Output Diode Current
DC Output Current
O
DC VCCor Ground Current
GND
Storage Temperature
stg
Lead Temperature (10 sec)
L
Supply Voltage
CC
Input Voltage 0 to V
I
Output Voltage 0 to V
O
Operating Temperature
op
= 3.0, 4.5 or 5.5
CC
CC
-0.5 to +7.0 V
-0.5 to +7.0 V
± 20 mA
± 50 mA
± 50 mA
± 400 mA
-65 to +150 °C
300 °C
2to6 V
CC
CC
-55 to 125 °C
0 to 8 ns/V
V
V
V
3/9
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