© 2004 Fairchild Semiconductor Corporation DS500130 www.fairchildsemi.com
March 1998
Revised October 2004
7
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74VCX16821
Low Voltage 20-Bit D-Type Flip-Flops
with 3.6V Tolerant Inputs and Outputs
General Description
The VCX16821 contains twenty non-inverting D-type flip-
flops with 3-STATE outputs and is intended for bus oriented
applications.
The 74VCX16821 is designed for low voltage (1.4V to
3.6V) V
CC
applications with I/O compatibility up to 3.6V.
The 74VCX16821 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintain-
ing low CMOS power dissipation.
Features
a73 1.4V to 3.6V V
CC
supply operation
a73 3.6V tolerant inputs and outputs
a73 t
PD
3.5 ns max for 3.0V to 3.6V V
CC
a73 Power-off high impedance inputs and outputs
a73 Supports live insertion and withdrawal (Note 1)
a73 Static Drive (I
OH
/I
OL
)
±24 mA @ 3.0V V
CC
a73 Uses patented noise/EMI reduction circuitry
a73 Latch-up performance exceeds 300 mA
a73 ESD performance:
Human body model > 2000V
Machine model > 200V
Note 1: To ensure the high-impedance state during power up or power
down, OE should be tied to V
CC
through a pull-up resistor; the minimum
value of the resistor is determined by the current-sourcing capability of the
driver.

Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbol Pin Descriptions
Order Number Package Number Package Descriptions
74VCX16821MTD MTD56 56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Pin Names Description
OE
n
Output Enable Input (Active LOW)
CLK
n
Clock Input
D
0
–D
19
Inputs
O
0
–O
19
Outputs