74LVTH16835 Low Voltage 18-Bit Universal Bus Driver
March 2001
Revised March 2001
74LVTH16835
Low Voltage 18-Bit Universal Bus Driver
with Bushold and 3-STATE Outputs
General Description
The LVTH16835 is an 18-bit universal bus driver that com-
bines 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 (A
n
) to Outputs (Y
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 LVTH16835 data inputs include bushold, eliminating
the need for external pull-up resistors to hold unused
inputs.
The bus driver is designed for low voltage (3.3V) V
CC
appli-
cations, but with the capability to provide a TTL interface to
a 5V environment. The LVTH16835 is fabricated with an
advanced BiCMOS technology to achieve high speed oper-
ation similar to 5V ABT while maintaining low power dissi-
pation.
Features
s
Input and output interface capability to systems at
5V V
CC
s
Bushold data inputs eliminate the need for external
pull-up resistors to hold unused inputs
s
Live insertion/extraction permitted
s
Power up/down high impedance provides glitch-free bus
loading
s
Outputs source/sink
−
32 mA/
+
64 mA
s
ESD Performance:
Human-Body Model
>
2000V
Machine Model
>
200V
Charged-Device Model
>
1000V
Ordering Code:
Order Number
74LVTH16835MEA
74LVTH16835MTD
Package Number
MS56A
MTD56
Package Description
56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300 Wide
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.
© 2001 Fairchild Semiconductor Corporation
DS500102
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74LVTH16835
Connection Diagram
Pin Descriptions
Pin Names
A
1
–A
18
Y
1
–Y
18
CLK
OE
LE
Description
Data Register Inputs
3-STATE Outputs
Clock Pulse Input
Output Enable Input
Latch Enable Input
Function Table
Inputs
OE
H
L
L
L
L
L
L
LE
X
H
H
L
L
L
L
CLK
X
X
X
A
n
X
L
H
L
H
X
X
Output
Y
n
Z
L
H
L
H
Y
0
(Note 1)
Y
0
(Note 2)
↑
↑
H
L
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
↑ =
HIGH-to-LOW Clock Transition
Note 1:
Output level before the indicated steady-state input conditions
were established, provided that CLK was HIGH before LE went LOW.
Note 2:
Output level before the indicated steady-state input conditions
were established.
Logic Diagram
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2
74LVTH16835
Absolute Maximum Ratings
(Note 3)
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
I
GND
T
STG
Parameter
Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Current
DC Supply Current per Supply Pin
DC Ground Current per Ground Pin
Storage Temperature
Value
Conditions
Units
V
V
Output in 3-STATE
Output in HIGH or LOW State (Note 4)
V
I
<
GND
V
O
<
GND
V
O
>
V
CC
V
O
>
V
CC
Output at HIGH State
Output at LOW State
V
V
mA
mA
mA
mA
mA
−
0.5 to
+
4.6
−
0.5 to
+
7.0
−
0.5 to
+
7.0
−
0.5 to
+
7.0
−
50
−
50
64
128
±
64
±
128
−
65 to
+
150
°
C
Recommended Operating Conditions
Symbol
V
CC
V
I
I
OH
I
OL
T
A
Supply Voltage
Input Voltage
HIGH-Level Output Current
LOW-Level Output Current
Free-Air Operating Temperature
Input Edge Rate, V
IN
=
0.8V–2.0V, V
CC
=
3.0V
Parameter
Min
2.7
0
Max
3.6
5.5
Units
V
V
mA
mA
−
32
64
−
40
0
85
10
°
C
ns/V
∆
t/
∆
V
Note 3:
Absolute Maximum continuous ratings are those values beyond which damage to the device may occur. Exposure to these conditions or conditions
beyond those indicated may adversely affect device reliability. Functional operation under absolute maximum rated conditions is not implied.
Note 4:
I
O
Absolute Maximum Rating must be observed.
3
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74LVTH16835
DC Electrical Characteristics
Symbol
V
IK
V
IH
V
IL
V
OH
Parameter
Input Clamp Diode Voltage
Input HIGH Voltage
Input LOW Voltage
Output HIGH Voltage
V
CC
(V)
2.7
2.7–3.6
2.7–3.6
2.7–3.6
2.7
3.0
V
OL
Output LOW Voltage
2.7
2.7
3.0
3.0
3.0
I
I(HOLD)
I
I(OD)
I
I
Bushold Input Minimum Drive
Bushold Input Over-Drive
Current to Change State
Input Current
Control Pins
Data Pins
I
OFF
I
PU/PD
I
OZL
I
OZH
I
OZH
+
I
CCH
I
CCL
I
CCZ
I
CCZ
+
∆I
CC
Power Off Leakage Current
Power Up/Down 3-STATE
Output Current
3-STATE Output Leakage Current
3-STATE Output Leakage Current
3-STATE Output Leakage Current
Power Supply Current
Power Supply Current
Power Supply Current
Power Supply Current
Increase in Power Supply Current
(Note 7)
Note 5:
An external driver must source at least the specified current to switch from LOW-to-HIGH.
Note 6:
An external driver must sink at least the specified current to switch from HIGH-to-LOW.
Note 7:
This is the increase in supply current for each input that is at the specified voltage level rather than V
CC
or GND.
T
A
= −40°C
to
+85°C
Min
2.0
0.8
V
CC
−
0.2
2.4
2.0
0.2
0.5
0.4
0.5
0.55
75
−75
500
−500
10
±1
−5
1
±100
±100
−5
5
10
0.19
5
0.19
0.19
0.2
Max
−1.2
Units
V
V
V
V
V
V
V
V
V
V
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
mA
mA
mA
mA
mA
Conditions
I
I
= −18
mA
V
O
≤
0.1V or
V
O
≥
V
CC
−
0.1V
I
OH
= −100 µA
I
OH
= −8
mA
I
OH
= −32
mA
I
OL
=
100
µA
I
OL
=
24 mA
I
OL
=
16 mA
I
OL
=
32 mA
I
OL
=
64 mA
V
I
=
0.8V
V
I
=
2.0V
(Note 5)
(Note 6)
V
I
=
5.5V
V
I
=
0V or V
CC
V
I
=
0V
V
I
=
V
CC
0V
≤
V
I
or V
O
≤
5.5V
V
O
=
0.5V to 3.0V
V
I
=
GND or V
CC
V
O
=
0.5V
V
O
=
3.0V
V
CC
<
V
O
≤
5.5V
Outputs HIGH
Outputs LOW
Outputs Disabled
V
CC
≤
V
O
≤
5.5V,
Outputs Disabled
One Input at V
CC
−
0.6V
Other Inputs at V
CC
or GND
3.0
3.0
3.6
3.6
3.6
0
0–1.5V
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.6
Dynamic Switching Characteristics
Symbol
V
OLP
V
OLV
Parameter
Quiet Output Maximum Dynamic V
OL
Quiet Output Minimum Dynamic V
OL
V
CC
(V)
3.3
3.3
(Note 8)
T
A
=
25°C
Conditions
Max
Units
V
V
C
L
=
50 pF, R
L
=
500Ω
(Note 9)
(Note 9)
Min
Typ
0.8
−0.8
Note 8:
Characterized in SSOP package. Guaranteed parameter, but not tested.
Note 9:
Max number of outputs defined as (n). n−1 data inputs are driven 0V to 3V. Output under test held LOW.
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4
74LVTH16835
AC Electrical Characteristics
T
A
= −40°C
to
+85°C,
C
L
=
50 pF, R
L
=
500
Ω
Symbol
Parameter
V
CC
=
3.3
±
0.3V
Min
f
MAX
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
S
Setup Time
A before CLK
A before LE, CLK HIGH
A before LE, CLK LOW
t
H
t
W
t
OSLH
t
OSHL
Hold Time
Pulse Duration
Output to Output Skew
(Note 10)
A after CLK
A after LE
LE HIGH
CLK HIGH or LOW
Output Disable Time
CLK to Y
Propagation Delay
A to Y
Propagation Delay
LE to Y
Propagation Delay
CLK to Y
Output Enable Time
150
1.3
1.2
1.5
1.4
1.5
1.4
0.9
1.3
1.7
1.6
2.1
2.3
1.5
1.0
0.8
3.3
3.3
1.0
1.0
5.1
4.7
5.4
5.1
5.5
5.1
4.7
5.2
5.8
5.8
Max
V
CC
=
2.7V
Min
150
1.3
1.3
1.5
1.5
1.5
1.5
1.3
1.3
1.7
1.7
2.4
1.5
1.5
1.0
1.0
3.3
3.3
1.0
1.0
ns
ns
ns
ns
5.5
5.2
6.0
5.7
6.1
5.7
5.5
6.4
6.3
6.3
Max
MHz
ns
ns
ns
ns
ns
Units
Note 10:
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
).
Capacitance
(Note 11)
Symbol
C
IN
C
OUT
Parameter
Input Capacitance
Output Capacitance
Conditions
V
CC
=
0V, V
I
=
0V or V
CC
V
CC
=
3.0V, V
O
=
0V or V
CC
Typical
4
8
Units
pF
pF
Note 11:
Capacitance is measured at frequency f
=
1 MHz, per MIL-STD-883, Method 3012.
5
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