FEATURES
· Member of the Texas Instruments Widebus™
Family
· EPIC™ (Enhanced-Performance Implanted
CMOS) Submicron Process
· ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
· Latch-Up Performance Exceeds 250 mA Per
JESD 17
· Bus Hold on Data Inputs Eliminates the Need
for External Pullup/Pulldown Resistors
· Package Options Include Plastic 300-mil
Shrink Small-Outline (DL) and Thin Shrink
Small-Outline (DGG) Packages

DESCRIPTION
This 18-bit bus-interface flip-flop is designed for
1.65-V to 3.6-V VCC operation.
The SN74ALVCH16823 features 3-state outputs
designed specifically for driving highly capacitive or
relatively low-impedance loads. This device is
particularly suitable for implementing wider buffer
registers, I/O ports, bidirectional bus drivers with
parity, and working registers.
The SN74ALVCH16823 can be used as two 9-bit
flip-flops or one 18-bit flip-flop. With the clock-enable
(CLKEN) input low, the D-type flip-flops enter data on
the low-to-high transitions of the clock. Taking
CLKEN high disables the clock buffer, thus latching
the outputs. Taking the clear (CLR) input low causes
the Q outputs to go low independently of the clock.
A buffered output-enable (OE) input can be used to place the nine outputs in either a normal logic state (high or
low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the
bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines
without need for interface or pullup components.
The output-enable (OE) input does not affect the internal operation of the flip-flops. Old data can be retained or
new data can be entered while 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 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 is provided to hold unused or floating data inputs at a valid logic level.
The SN74ALVCH16823 is characterized for operation from –40°C to 85°C.