Datasheet

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
GQL OR ZQL PACKAGE
(TOP VIEW)
J
H
G
F
E
D
C
B
A
21 3 4 65
K
abc
GRD OR ZRD PACKAGE
(TOP VIEW)
J
H
G
F
E
D
C
B
A
21 3 4 65
SN74LVCH16244A
16-BIT BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCES494A – OCTOBER 2003 – REVISED NOVEMBER 2005
The device can be used as four 4-bit buffers, two 8-bit buffers, or one 16-bit buffer. It provides true outputs and
symmetrical active-low output-enable ( OE) inputs.
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.
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in
a mixed 3.3-V/5-V system environment.
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.
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.
TERMINAL ASSIGNMENTS
(1)
(56-Ball GQL/ZQL Package)
1 2 3 4 5 6
A 1 OE NC NC NC NC 2 OE
B 1Y2 1Y1 GND GND 1A1 1A2
C 1Y4 1Y3 V
CC
V
CC
1A3 1A4
D 2Y2 2Y1 GND GND 2A1 2A2
E 2Y4 2Y3 2A3 2A4
F 3Y1 3Y2 3A2 3A1
G 3Y3 3Y4 GND GND 3A4 3A3
H 4Y1 4Y2 V
CC
V
CC
4A2 4A1
J 4Y3 4Y4 GND GND 4A4 4A3
K 4 OE NC NC NC NC 3 OE
abc (1) NC – No internal connection
TERMINAL ASSIGNMENTS
(1)
(54-Ball GRD/ZRD Package)
1 2 3 4 5 6
A 1Y1 NC 1 OE 2 OE NC 1A1
B 1Y3 1Y2 NC NC 1A2 1A3
C 2Y1 1Y4 V
CC
V
CC
1A4 2A1
D 2Y3 2Y2 GND GND 2A2 2A3
E 3Y1 2Y4 GND GND 2A4 3A1
F 3Y3 3Y2 GND GND 3A2 3A3
G 4Y1 3Y4 V
CC
V
CC
3A4 4A1
H 4Y3 4Y2 NC NC 4A2 4A3
J 4Y4 NC 4 OE 3 OE NC 4A4
(1) NC – No internal connection
2