IDT74ALVCH16823
3.3V CMOS 18-BIT BUS-INTERFACE FLIP-FLOP WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
3.3V CMOS 18-BIT
BUS-INTERFACE FLIP-
FLOP WITH 3-STATE OUT-
PUTS AND BUS-HOLD
鈥?0.5 MICRON CMOS Technology
鈥?Typical t
SK(o)
(Output Skew) < 250ps
鈥?ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
鈥?V
CC
= 3.3V 鹵 0.3V, Normal Range
鈥?V
CC
= 2.7V to 3.6V, Extended Range
鈥?V
CC
= 2.5V 鹵 0.2V
鈥?CMOS power levels (0.4碌 W typ. static)
碌
鈥?Rail-to-Rail output swing for increased noise margin
鈥?Available in TSSOP package
IDT74ALVCH16823
FEATURES:
DRIVE FEATURES:
鈥?High Output Drivers: 鹵24mA
鈥?Suitable for heavy loads
APPLICATIONS:
鈥?3.3V high speed systems
鈥?3.3V and lower voltage computing systems
This 18-bit bus-interface flip-flop is built using advanced dual metal CMOS
technology. The ALVCH16823 features 3-state outputs designed specifically
for driving highly capacitive or relatively low-impedance loads. The device is
particularly suitable for implementing wider buffer registers, I/O ports, bidirec-
tional bus drivers with parity, and working registers.
The ALVCH16823 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 a 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
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.
The ALVCH16823 has been designed with a 鹵24mA output driver. This
driver is capable of driving a moderate to heavy load while maintaining speed
performance.
The ALVCH16823 has 鈥渂us-hold鈥?which retains the inputs鈥?last state
whenever the input goes to a high impedance. This prevents floating inputs and
eliminates the need for pull-up/down resistor.
DESCRIPTION:
FUNCTIONAL BLOCK DIAGRAM
1
OE
2
2
OE
27
1
CLR
1
2
CLR
28
1
CLKEN
55
CE
R
3
2
CLKEN
30
CE
R
15
1
CLK
1
D
1
56
54
C
1
D
1
1
Q
1
2
CLK
2
D
1
29
42
C
1
D
1
2
Q
1
TO 8 OTHER CHANNELS
TO 8 OTHER CHANNELS
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
漏 2004 Integrated Device Technology, Inc.
JANUARY 2004
DSC-4237/2
1
2
3
4
5
6
7
