74VCX162835 Low Voltage 18-Bit Universal Bus Driver with 3.6V Tolerant Inputs/Outputs and 26Ω Series
Resistors in Outputs
October 1998
Revised November 2000
74VCX162835
Low Voltage 18-Bit Universal Bus Driver
with 3.6V Tolerant Inputs/Outputs
and 26
Ω
Series Resistors in Outputs
General Description
The VCX162835 low voltage 18-bit universal bus driver
combines D-type latches and D-type flip-flops to allow data
flow in transparent, latched and clocked modes.
Data flow is controlled by output-enable (OE), latch-enable
(LE), and clock (CLK) inputs. The device operates in
Transparent Mode when LE is held HIGH. The device
operates in clocked mode when LE is LOW and CLK is tog-
gled. Data transfers from the Inputs (I
n
) to Outputs (O
n
) on
a Positive Edge Transition of the Clock. When OE is LOW,
the output data is enabled. When OE is HIGH the output
port is in a high impedance state.
The VCX162835 is designed with 26
Ω
series resistors in
the outputs. This design reduces noise in applications such
as memory address drivers, clock drivers, and bus trans-
ceivers/transmitters.
The 74VCX162835 is designed for low voltage (1.65V to
3.6V) V
CC
applications with I/O capability up to 3.6V.
The 74VCX162835 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintain-
ing low CMOS power dissipation.
Features
s
Compatible with PC100 DIMM module specifications
s
1.65V–3.6V V
CC
specifications provided
s
3.6V tolerant inputs and outputs
s
26
Ω
series resistors in outputs
s
t
PD
(CLK to O
n
)
4.2ns max for 3.0V to 3.6V V
CC
5.2ns max for 2.3V to 2.7V V
CC
9.2ns max for 1.65V to 1.95V V
CC
s
Power-down high impedance inputs and outputs
s
Supports live insertion/withdrawal (Note 1)
s
Static Drive (I
OH
/I
OL
)
±
12mA @ 3.0V V
CC
±
8 mA @ 2.3V V
CC
±
3 mA @ 1.65V V
CC
s
Latchup performance exceeds 300 mA
s
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 pulldown resistor; the minimum
value of the resistor is determined by the current sourcing capability of the
driver.
Ordering Code:
Order Number
74VCX162835MTD
Package Number
MTD56
Package Description
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
© 2000 Fairchild Semiconductor Corporation
DS500181
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74VCX162835
Connection Diagram
Pin Descriptions
Pin Names
OE
LE
CLK
I
1
- I
18
O
1
- O
18
Description
Output Enable Input (Active LOW)
Latch Enable Input
Clock Input
Data Inputs
3-STATE Outputs
Truth Table
Inputs
OE
H
L
L
L
L
L
L
LE
X
H
H
L
L
L
L
CLK
X
X
X
I
n
X
L
H
L
H
X
X
Outputs
O
n
Z
L
H
L
H
O
0
(Note 2)
O
0
(Note 3)
↑
↑
H
L
H
=
Logic HIGH
L
=
Logic LOW
X
=
Don’t Care, but not floating
Z
=
High Impedance
↑ =
LOW-to-HIGH Clock Transition
Note 2:
Output level before the indicated steady-state input conditions
were established provided that CLK was HIGH before LE went LOW.
Note 3:
Output level before the indicated steady-state input conditions
were established.
Logic Diagram
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2
74VCX162835
Absolute Maximum Ratings
(Note 4)
Supply Voltage (V
CC
)
DC Input Voltage (V
I
)
Output Voltage (V
O
)
Outputs 3-STATE
Outputs Active (Note 5)
DC Input Diode Current (I
IK
) V
I
<
0V
DC Output Diode Current (I
OK
)
V
O
<
0V
V
O
>
V
CC
DC Output Source/Sink Current
(I
OH
/I
OL
)
DC V
CC
or Ground Current per
Supply Pin (I
CC
or Ground)
Storage Temperature Range (T
STG
)
−
0.5V to
+
4.6V
−
0.5V to
+
4.6V
−
0.5V to
+
4.6V
−
0.5V to V
CC
+
0.5V
−
50 mA
−
50 mA
+
50 mA
±
50 mA
±
100 mA
−
65
°
C to
+
150
°
C
Recommended Operating
Conditions
(Note 6)
Power Supply
Operating
Data Retention Only
Input Voltage
Output Voltage (V
O
)
Output in Active States
Output in 3-STATE
Output Current in I
OH
/I
OL
V
CC
=
3.0V to 3.6V
V
CC
=
2.3V to 2.7V
V
CC
=
1.65V to 2.3V
Free Air Operating Temperature (T
A
)
Minimum Input Edge Rate (
∆
t/
∆
V)
V
IN
=
0.8V to 2.0V, V
CC
=
3.0V
10 ns/V
Note 4:
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 tables will define the condi-
tions for actual device operation.
Note 5:
I
O
Absolute Maximum Rating must be observed.
Note 6:
Floating or unused pin (inputs or I/O's) must be held HIGH or LOW.
1.65V to 3.6V
1.2V to 3.6V
−
0.3V to 3.6V
0V to V
CC
0V to 3.6V
±
12 mA
±
8 mA
±
3 mA
−
40
°
C to
+
85
°
C
DC Electrical Characteristics (2.7V
<
V
CC
≤
3.6V)
Symbol
V
IH
V
IL
V
OH
Parameter
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
I
OH
= −100 µA
I
OH
= −6
mA
I
OH
= −8
mA
I
OH
= −12
mA
V
OL
LOW Level Output Voltage
I
OL
=
100
µA
I
OL
=
6mA
I
OL
=
8 mA
I
OL
=
12mA
I
I
I
OZ
I
OFF
I
CC
∆I
CC
Input Leakage Current
3-STATE Output Leakage
Power Off Leakage Current
Quiescent Supply Current
Increase in I
CC
per Input
0V
≤
V
I
≤
3.6V
0V
≤
V
O
≤
3.6V
V
I
=
V
IH
or V
IL
0V
≤
(V
I
, V
O
)
≤
3.6V
V
I
=
V
CC
or GND
V
CC
≤
(V
I
, V
O
)
≤
3.6V (Note 7)
V
IH
=
V
CC
−
0.6V
Note 7:
Outputs disabled or 3-STATE only.
Conditions
V
CC
(V)
2.7–3.6
2.7–3.6
2.7–3.6
2.7
3.0
3.0
2.7–3.6
2.7
3.0
3.0
2.7–3.6
2.7–3.6
0
2.7–3.6
2.7–3.6
Min
2.0
Max
Units
V
0.8
V
CC
−
0.2
2.2
2.4
2.2
0.2
0.4
0.55
0.8
±5.0
±10
10
20
±20
750
V
V
V
µA
µA
µA
µA
µA
3
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74VCX162835
DC Electrical Characteristics (2.3V
≤
V
CC
≤
2.7V)
Symbol
V
IH
V
IL
V
OH
Parameter
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
I
OH
= −100 µA
I
OH
= −3
mA
I
OH
= −6
mA
I
OH
= −8
mA
V
OL
LOW Level Output Voltage
I
OL
=
100
µA
I
OL
=
6 mA
I
OL
=
8 mA
I
I
I
OZ
I
OFF
I
CC
Input Leakage Current
3-STATE Output Leakage
Power Off Leakage Current
Quiescent Supply Current
0V
≤
V
I
≤
3.6V
0V
≤
V
O
≤
3.6V
V
I
=
V
IH
or V
IL
0V
≤
(V
I
, V
O
)
≤
3.6V
V
I
=
V
CC
or GND
V
CC
≤
(V
I
, V
O
)
≤
3.6V (Note 8)
Note 8:
Outputs disabled or 3-STATE only.
Conditions
V
CC
(V)
2.3–2.7
2.3–2.7
2.3–2.7
2.3
2.3
2.3
2.3–2.7
2.3
2.3
2.3–2.7
2.3–2.7
0
2.3–2.7
Min
1.6
Max
Units
V
0.7
V
CC
−
0.2
2.0
1.8
1.7
0.2
0.4
0.6
±5.0
±10
10
20
±20
V
V
V
µA
µA
µA
µA
DC Electrical Characteristics (1.65V
≤
V
CC
<
2.3V)
Symbol
V
IH
V
IL
V
OH
V
OL
I
I
I
OZ
I
OFF
I
CC
Parameter
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
LOW Level Output Voltage
Input Leakage Current
3-STATE Output Leakage
Power Off Leakage Current
Quiescent Supply Current
I
OH
= −100 µA
I
OH
= −3
mA
I
OL
=
100
µA
I
OL
=
3 mA
0V
≤
V
I
≤
3.6V
0V
≤
V
O
≤
3.6V
V
I
=
V
IH
or V
IL
0V
≤
(V
I
, V
O
)
≤
3.6V
V
I
=
V
CC
or GND
V
CC
≤
(V
I
, V
O
)
≤
3.6V (Note 9)
Note 9:
Outputs disabled or 3-STATE only.
Conditions
V
CC
(V)
1.65 - 2.3
1.65 - 2.3
1.65 - 2.3
1.65
1.65 - 2.3
1.65
1.65 - 2.3
1.65 - 2.3
0
1.65 - 2.3
Min
0.65
×
V
CC
Max
Units
V
0.35
×
V
CC
V
CC
−
0.2
1.25
0.2
0.3
±5.0
±10
10
20
±20
V
V
V
µA
µA
µA
µA
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4
74VCX162835
AC Electrical Characteristics
(Note 10)
T
A
= −40°C
to
+85°C,
C
L
=
30 pF, R
L
=
500Ω
Symbol
Parameter
V
CC
=
3.3V
±
0.3V
Min
f
MAX
t
PHL
, t
PLH
t
PHL
, t
PLH
t
PHL
, t
PLH
t
PZL
, t
PZH
t
PLZ
, t
PHZ
t
S
t
H
t
W
t
OSHL
t
OSLH
Maximum Clock Frequency
Propagation Delay
Bus to Bus
Propagation Delay
Clock to Bus
Propagation Delay
LE to Bus
Output Enable Time
Output Disable Time
Setup Time
Hold Time
Pulse Width
Output to Output Skew
(Note 11)
250
0.6
1.4
0.6
0.6
0.6
1.5
0.7
1.5
0.5
3.9
4.2
4.7
4.3
4.2
Max
V
CC
=
2.5
±
0.2V
Min
200
0.8
1.5
0.8
0.8
0.8
1.5
0.7
1.5
0.5
5.0
5.2
5.8
5.9
4.7
Max
V
CC
=
1.8
±
0.15V
Min
100
1.5
2.0
1.5
1.5
1.5
2.5
1.0
4.0
0.75
9.8
9.2
9.8
9.8
7.9
Max
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
Units
Note 10:
For CL=50pF, add approximately 300ps to the AC maximum specification.
Note 11:
Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The
specification applies to any outputs switching in the same direction, either HIGH-to-LOW (t
OSHL
) or LOW-to-HIGH (t
OSLH
).
AC Electrical Characteristics Over Load
(Note 12)
T
A
= −0°C
to
+85°C,
R
L
=
500Ω V
CC
=
3.3V
±
0.15V
Symbol
Parameter
Min
t
PHL
, t
PLH
t
PHL
, t
PLH
t
PHL
, t
PLH
t
PZL
, t
PZH
t
PLZ
, t
PHZ
t
PHL
, t
PLH
t
S
t
H
Propagation Delay Bus to Bus
Propagation Delay Clock to Bus
Propagation Delay LE to Bus
Output Enable Time
Output Disable Time
SSO Propagation Delay Clock to Bus (Note 13)
Setup Time
Hold Time
0.7
1.4
0.7
0.7
0.7
1.4
1.5
0.7
C
L
=
0 pF
Max
2.6
2.9
3.4
3.0
2.9
3.2
1.5
0.7
Min
1.0
1.9
1.0
1.0
1.0
C
L
=
50 pF
Max
4.2
4.5
5.0
4.6
4.5
ns
ns
ns
ns
ns
ns
ns
ns
Units
Note 12:
Characterized only.
Note 13:
SSO=Simultaneous Switching Output. Any output combination of LOW-to-HIGH and/or HIGH-to-LOW transition.
Dynamic Switching Characteristics
Symbol
V
OLP
Parameter
Quiet Output Dynamic Peak V
OL
Conditions
C
L
=
30 pF, V
IH
=
V
CC
, V
IL
=
0V
V
CC
(V)
1.8
2.5
3.3
V
OLV
Quiet Output Dynamic Valley V
OL
C
L
=
30 pF, V
IH
=
V
CC
, V
IL
=
0V
1.8
2.5
3.3
V
OHV
Quiet Output Dynamic Valley V
OH
C
L
=
30 pF, V
IH
=
V
CC
, V
IL
=
0V
1.8
2.5
3.3
T
A
=+25°C
Typical
0.25
0.35
0.45
−0.25
−0.35
−0.45
1.35
1.85
2.45
V
V
V
Units
5
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