Fairchild Semiconductor 74VCX162827MTDX, 74VCX162827MTD, 74VCX162827MEAX, 74VCX162827MEA Datasheet
March 1998
Revised April 1999
74VCX162827 Low Voltage 20-Bit Buffer/Line Driver with 3.6V Tolerant Inputs and Outputs and 26Ω Series Resis-
tors in the Outputs
© 1999 Fairchild Semiconductor Corporation DS500138.prf www.fairchildsemi.com
74VCX162827
Low Voltage 20-Bit Buffer/Line Driver with 3.6V Tolerant
Inputs and Outputs and 26Ω Series Resistors in the
Outputs
General Description
The VCX162827 contains twen ty no n-i n ver ting b uffers wi th
3-STATE outputs to be employed as a memory and
address driver, clock driver, or bus oriented transmitter/
receiver. The device is byte controlled. Each byte has NOR
output enables for maximum control flexibility.
The 74VCX162827 is designed for low v oltage (1.65V to
3.6V) V
CC
applications with I/O capability up to 3.6V. The
VCX162827 is also designed with 26Ω resisto rs in t he ou tputs.
The 74VCX162827 is fab ricated with an advance d 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
■ 26Ω series resistors in outputs
■ t
PD
3.4 ns max for 3.0V to 3.6V V
CC
4.1 ns max for 2.3V to 2.7V VCC
8.2 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
)
±12 mA @ 3.0V V
CC
±8 mA @ 2.3V V
CC
±3 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:
Devices also availab le in Tape and Reel. Specify by appending th e s uffix “X” to the ordering code.
Logic Symbol Pin Descriptions
Order Number Package Number Package Description
74VCX162827MTD 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)
I
0–I19
Inputs
O
0–O19
Outputs
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74VCX162827
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
Functional Description
The 74VCX162827 cont ains twenty non-inverting buffers
with 3-STATE outputs. Th e device is byte controlled with
each byte functioning i dentically, but independent of each
other. The control pins may be sh orted together to obtai n
full 20-bit operation. The 3-STATE outputs are controlled by
Output Enable (OE
n
) inputs. When OE1, and OE2 are
LOW, O
0–O10
are in the 2-state mode. When either OE1 or
OE
2
are HIGH, the standard outputs are in the high imped-
ance mode but this does not inte rfere with entering new
data into the inputs. The sam e applies for byte two with
OE
3
and OE4.
Logic Diagrams
Inputs Outputs
OE
1
OE
2
I0–I
9
O0–O
9
LL L L
LL H H
HX X Z
XH X Z
Inputs Outputs
OE
3
OE
4
I0–I
9
O10–O
19
LL L L
LL H H
HX X Z
XH X Z
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74VCX162827
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 3-STATE 0.0V to 3.6V
Output Current in I
OH/IOL
VCC = 3.0V to 3.6V ±12 mA
V
CC
= 2.3V to 2.7V ±8 mA
V
CC
= 1.65V to 2.3V ±3 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
Min Max Units
(V)
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 µA2.7 − 3.6 VCC − 0.2 V
IOH = −6 mA 2.7 2.2 V
IOH = −8 mA 3.0 2.4 V
IOH = −12 mA 3.0 2.2 V
V
OL
LOW Level Output Voltage IOL = 100 µA2.7 − 3.6 0.2 V
IOL = 6 mA 2.7 0.4 V
IOL = 8 mA 3.0 0.55 V
IOL = 12 mA 3.0 0.8 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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