Fairchild Semiconductor 74VCX16821MTDX, 74VCX16821MTD, 74VCX16821MEAX, 74VCX16821MEA Datasheet
March 1998
Revised April 1999
74VCX16821 Low Voltage 20-Bit D-Type Flip-Flops with 3.6V Tolerant Inputs and Outputs
© 1999 Fairchild Semiconductor Corporation DS500130.prf www.fairchildsemi.com
74VCX16821
Low Voltage 20-Bit D-Type Flip-Flops with 3.6V Tolerant
Inputs and Outputs
General Description
The VCX16821 con tains twenty non-inverting D-type flipflops with 3-STATE outputs and is intended for bus oriented
applications.
The 74VCX16821 is designed for low voltage (1.65V 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 maintaining low CMOS power dissipation.
Features
■ 1.65V–3.6V VCC supply operation
■ 3.6V tolerant inputs and outputs
■ t
PD
3.5 ns max for 3.0V to 3.6V V
CC
4.4 ns max for 2.3V to 2.7V V
CC
8.8 ns max for 1.65V to 1.95V V
CC
■ Power-off high impedance inputs and outputs
■ Supports live insertion and withdrawal (Note 1)
■ Static Drive (I
OH/IOL
)
±24 mA @ 3.0V V
CC
±18 mA @ 2.3V V
CC
±6 mA @ 1.65V V
CC
■ Uses patented noise/EMI reduction circuitry
■ Latch-up performance exceeds 300 mA
■ ESD performance:
Human body model > 2000V
Machine model > 200V
Note 1: To ensure the high-impedance state d uring power up or power
down, OE
should be tied to VCC through a pull-up r esistor; the min imum
value of the res istor is d eter mine d by the cu rre nt-sou rcin g ca pa bility of t he
driver.
Ordering Code:
Device also available in Tape and Reel. Specify by appending s uffix let te r “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–D19
Inputs
O
0–O19
Outputs
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74VCX16821
Connection Diagram Tr uth Tables
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial (HIGH or LOW, inputs may not float)
Z = High Impedance
O0 = Previous O0 before LOW-to-HIGH tr ansition of Clock
= LOW-to-HIGH transition
Functional Description
The VCX16821 contains twenty D-type flip-flops with 3STATE standard outputs. The device is byte controlled with
each byte functioning i dentically, but independent of each
other. Control pins can be shor ted together to obtain full
20-bit operation. The foll owing description appl ies to each
byte. The twenty flip-flops will store the state of their individual D-type inputs that meet the setup and hold time
requirements on the LOW-to-HIGH C lock (CLK) transition.
The 3-STATE standard outputs are controlled by the O utput Enable (OE
n
) input. When OEn is HIGH, the standard
outputs are in the high impedan ce mode but this does not
interfere with entering new data into the flip-flops.
Logic Diagrams
Please note that this diagram is provided only for the understan ding of logic operation s and should not be used t o es t im ate propagation delays.
Inputs Outputs
CLK
1
OE
1
D0–D9O0–O
9
XHXZ
LLL
LHH
L or H L X O
0
Inputs Outputs
CLK
2
OE2D10–D19O10–O
19
XHXZ
LLL
LHH
L or H L X O
0
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74VCX16821
Absolute Maximum Ratings(Note 2) Recommended Operating
Conditions
(Note 4)
Note 2: The Absolute Maximum Ratings are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the Absolute Maximum Rat-
ings. The “Recommended Operating Conditions” table will define the conditions for actual device operation.
Note 3: I
O
Absolute Maximum Rating must be observed.
Note 4: Floating or unused inputs m us t be held HIGH or LOW.
DC Electrical Characteristics (2.7V < VCC ≤ 3.6V)
Note 5: Outputs disab led or 3-STATE only.
Supply Voltage (VCC) −0.5V to +4.6V
DC Input Voltage (V
I
) −0.5V to +4.6V
Output Voltage (V
O
)
Outputs 3-STATE −0.5V to +4.6V
Outputs Active (Note 3) −0.5V to V
CC
+ 0.5V
DC Input Diode Current (I
IK
) VI < 0V −50 mA
DC Output Diode Current (I
OK
)
V
O
< 0V −50 mA
V
O
> V
CC
+50 mA
DC Output Source/Sink Current
(I
OH/IOL
) ±50 mA
DC V
CC
or GND Current per
Supply Pin (I
CC
or GND) ±100 mA
Storage Temperature Range (T
STG
) −65°C to +150°C
Power Supply
Operating 1.65V to 3.6V
Data Retention Only 1.2V to 3.6V
Input Voltage −0.3V to +3.6V
Output Voltage (V
O
)
Output in Active States 0V to V
CC
Output in “OFF” State 0.0V to 3.6V
Output Current in I
OH/IOL
VCC = 3.0V to 3.6V ±24 mA
V
CC
= 2.3V to 2.7V ±18 mA
V
CC
= 1.65V to 2.3V ±6 mA
Free Air Operating Temperature
(T
A
) −40°C to +85°C
Minimum Input Edge Rate (∆t/∆V)
V
IN
= 0.8V to 2.0V, VCC = 3.0V 10 ns/V
Symbol Parameter Conditions
V
CC
(V)
Min Max Units
V
IH
HIGH Level Input Voltage 2.7 − 3.6 2.0 V
V
IL
LOW Level Input Voltage 2.7 − 3.6 0.8 V
V
OH
HIGH Level Output Voltage IOH = −100 µA 2.7 − 3.6 VCC − 0.2 V
IOH = −12 mA 2.7 2.2 V
IOH = −18 mA 3.0 2.4 V
IOH = −24 mA 3.0 2.2 V
V
OL
LOW Level Output Voltage IOL = 100 µA 2.7 − 3.6 0.2 V
IOL = 12 mA 2.7 0.4 V
IOL = 18 mA 3.0 0.4 V
IOL = 24 mA 3.0 0.55 V
I
I
Input Leakage Current 0 ≤ VI ≤ 3.6V 2.7 − 3.6 ±5.0 µA
I
OZ
3-STATE Output Leakage 0 ≤ VO ≤ 3.6V
2.7 − 3.6 ±10 µA
VI = VIH or V
IL
I
OFF
Power-OFF Leakage Current 0 ≤ (VI, VO) ≤ 3.6V 0 10 µA
I
CC
Quiescent Supply Current VI = VCC or GND 2.7 − 3.6 20 µA
VCC ≤ (VI, VO) ≤ 3.6V (Note 5) 2.7 − 3.6 ±20 µA
∆I
CC
Increase in ICC per Input VIH = VCC −0.6V 2.7 − 3.6 750 µA
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