IDT74ALVC16835
3.3V CMOS 18-BIT UNIVERSAL BUS DRIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
3.3V CMOS 18-BIT
UNIVERSAL BUS DRIVER
WITH 3-STATE OUTPUTS
FEATURES:
DESCRIPTION:
IDT74ALVC16835
• 0.5 MICRON CMOS Technology
• Typical t
SK(o)
(Output Skew) < 250ps
• ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
• V
CC
= 3.3V ± 0.3V, Normal Range
• V
CC
= 2.7V to 3.6V, Extended Range
• V
CC
= 2.5V ± 0.2V
• CMOS power levels (0.4µ W typ. static)
µ
• Rail-to-Rail output swing for increased noise margin
• Available in SSOP, TSSOP, and TVSOP packages
This 18-bit universal bus driver is built using advanced dual metal
CMOS technology. Data flow from A to Y is controlled by the output-enable
(OE) input. The device operates in the transparent mode when the latch-
enable (LE) input is high. The A data is latched if the clock (CLK) input is
held at a high or low logic level. If LE is low, the A data is stored in the latch
flip-flop on the low-to-high transition of CLK. When
OE
is high, the outputs
are in the high-impedance state.
The ALVC16835 has been designed with a ±24mA output driver. This
driver is capable of driving a moderate to heavy load while maintaining
speed performance.
DRIVE FEATURES:
• High Output Drivers: ±24mA
• Suitable for heavy loads
APPLICATIONS:
• SDRAM Modules
• PC Motherboards
• Workstations
FUNCTIONAL BLOCK DIAGRAM
OE
27
CLK
30
LE
28
A
1
54
1
D
3
C
1
CLK
Y
1
TO 17 OTHER CHANNELS
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
© 1999 Integrated Device Technology, Inc.
MARCH 1999
DSC-4478/1
IDT74ALVC16835
3.3V CMOS 18-BIT UNIVERSAL BUS DRIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Max
V
TERM
(2)
Terminal Voltage with Respect to GND
–0.5 to +4.6
–0.5 to V
CC
+0.5
–65 to +150
–50 to +50
±50
–50
±100
V
TERM
(3)
Terminal Voltage with Respect to GND
T
STG
I
OUT
I
IK
I
OK
I
CC
I
SS
Storage Temperature
DC Output Current
Continuous Clamp Current,
V
I
< 0 or V
I
> V
CC
Continuous Clamp Current, V
O
< 0
Continuous Current through each
V
CC
or GND
Unit
V
V
°C
mA
mA
mA
mA
NC
NC
Y
1
GND
Y
2
Y
3
V
CC
Y
4
Y
5
Y
6
GND
Y
7
Y
8
Y
9
Y
10
Y
11
Y
12
GND
Y
13
Y
14
Y
15
V
CC
Y
16
Y
17
GND
Y
18
OE
LE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
GND
NC
A
1
GND
A
2
A
3
V
CC
A
4
A
5
A
6
GND
A
7
A
8
A
9
A
10
A
11
A
12
GND
A
13
A
14
A
15
V
CC
A
16
A
17
GND
A
18
CLK
GND
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
2. V
CC
terminals.
3. All terminals except V
CC
.
CAPACITANCE
(T
A
= +25°C, F = 1.0MHz)
Symbol
C
IN
C
OUT
C
OUT
Parameter
(1)
Input Capacitance
Output Capacitance
I/O Port Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
V
IN
= 0V
Typ.
5
7
7
Max.
7
9
9
Unit
pF
pF
pF
NOTE:
1. As applicable to the device type.
FUNCTION TABLE
(1)
Inputs
OE
H
L
L
L
L
L
LE
X
H
H
L
L
L
L
CLK
X
X
X
↑
↑
H
L
Ax
X
L
H
L
H
X
X
Outputs
Yx
Z
L
H
L
H
Y
0
Y
0
(2)
(3)
SSOP/ TSSOP/ TVSOP
TOP VIEW
PIN DESCRIPTION
Pin Names
OE
CLK
LE
Ax
Yx
NC
Description
3-State Output Enable Inputs (Active LOW)
Register Input Clock
Latch Enable (Transparent LOW)
Data Inputs
3-State Outputs
No Internal Connection
2
L
NOTES:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance
↑
= LOW-to-HIGH transition
2. Output level before the indicated steady-state input conditions were established,
provided that CLK is HIGH before LE went HIGH.
3. Output level before the indicated steady-state input conditions were established.
IDT74ALVC16835
3.3V CMOS 18-BIT UNIVERSAL BUS DRIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: T
A
= –40°C to +85°C
Symbol
V
IH
V
IL
I
IH
I
IL
I
OZH
I
OZL
V
IK
V
H
I
CCL
I
CCH
I
CCZ
∆I
CC
Parameter
Input HIGH Voltage Level
Input LOW Voltage Level
Input HIGH Current
Input LOW Current
High Impedance Output Current
(3-State Output pins)
Clamp Diode Voltage
Input Hysteresis
Quiescent Power Supply Current
V
CC
= 2.3V, I
IN
= –18mA
V
CC
= 3.3V
V
CC
= 3.6V
V
IN
= GND or V
CC
One input at V
CC
- 0.6V, other inputs at V
CC
or GND
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 3.6V
V
CC
= 3.6V
V
CC
= 3.6V
V
I
= V
CC
V
I
= GND
V
O
= V
CC
V
O
= GND
Test Conditions
Min.
1.7
2
—
—
—
—
—
—
—
—
—
Typ.
(1)
—
—
—
—
—
—
—
—
–0.7
100
0.1
Max.
—
—
0.7
0.8
±5
±5
±10
±10
–1.2
—
40
V
mV
µA
µA
µA
µA
V
Unit
V
Quiescent Power Supply Current
Variation
—
—
750
µA
NOTE:
1. Typical values are at V
CC
= 3.3V, +25°C ambient.
OUTPUT DRIVE CHARACTERISTICS
Symbol
V
OH
Parameter
Output HIGH Voltage
V
CC
= 2.3V
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3V
V
CC
= 3V
V
OL
Output LOW Voltage
V
CC
= 2.3V to 3.6V
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3V
I
OH
= – 24mA
I
OL
= 0.1mA
I
OL
= 6mA
I
OL
= 12mA
I
OL
= 12mA
I
OL
= 24mA
Test Conditions
(1)
V
CC
= 2.3V to 3.6V
I
OH
= – 0.1mA
I
OH
= – 6mA
I
OH
= – 12mA
Min.
V
CC
– 0.2
2
1.7
2.2
2.4
2
—
—
—
—
—
Max.
—
—
—
—
—
—
0.2
0.4
0.7
0.4
0.55
V
Unit
V
NOTE:
1. V
IH
and V
IL
must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the appropriate V
CC
range.
T
A
= – 40°C to + 85°C.
3
IDT74ALVC16835
3.3V CMOS 18-BIT UNIVERSAL BUS DRIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
OPERATING CHARACTERISTICS, T
A
= 25°C
V
CC
= 2.5V ± 0.2V
Symbol
C
PD
C
PD
Parameter
Power Dissipation Capacitance Outputs enabled
Power Dissipation Capacitance Outputs disabled
Test Conditions
C
L
= 0pF, f = 10Mhz
Typical
26
12
V
CC
= 3.3V ± 0.3V
Typical
31
15
Unit
pF
SWITCHING CHARACTERISTICS
(1)
V
CC
= 2.5V ± 0.2V
Symbol
f
MAX
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
W
t
W
t
SU
t
SU
t
SU
t
H
t
H
t
SK(O)
Propagation Delay
Ax to Yx
Propagation Delay
LE to Yx
Propagation Delay
CLK to Yx
Output Enable Time
OE
to Yx
Output Disable Time
OE
to Yx
Pulse Duration, LE LOW
Pulse Duration, CLK HIGH or LOW
Set-up Time, data before CLK↑
Set-up Time, data before LE↓, CLK HIGH
Set-up Time, data before LE↓, CLK LOW
Hold Time, data after CLK↑
Hold Time, data after LE↓, CLK HIGH or LOW
Output Skew
(2)
3.3
3.3
2.2
1.9
1.3
0.6
1.4
—
—
—
—
—
—
—
—
—
3.3
3.3
2.1
1.6
1.1
0.6
1.7
—
—
—
—
—
—
—
—
—
3.3
3.3
1.7
1.5
1
0.7
1.4
—
—
—
—
—
—
—
—
500
ns
ns
ns
ns
ns
ns
ns
ps
1
4.5
—
4.3
1.3
3.9
ns
1.4
5.5
—
5.6
1.1
4.6
ns
1.4
5.5
—
5.2
1.4
4.5
ns
1.3
5
—
4.9
1.3
4.2
ns
Parameter
Min.
150
1
Max.
—
4.2
V
CC
= 2.7V
Min.
150
—
Max.
—
4.2
V
CC
= 3.3V ± 0.3V
Min.
150
1
Max.
—
3.6
Unit
MHz
ns
NOTES:
1. See TEST CIRCUITS AND WAVEFORMS. T
A
= – 40°C to + 85°C.
2. Skew between any two outputs of the same package and switching in the same direction.
SWITCHING CHARACTERISTICS FROM 0°C TO 65°C, C
L
= 50pF
V
CC
= 3.3V ± 0.15V
Symbol
t
PLH
t
PHL
Parameter
Propagation Delay
CLK to xYx
Min.
1.7
Max.
4.5
Unit
ns
4
IDT74ALVC16835
3.3V CMOS 18-BIT UNIVERSAL BUS DRIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
V
IH
V
T
0V
V
OH
V
T
V
OL
V
IH
V
T
0V
ALV C Link
TEST CIRCUITS AND WAVEFORMS
TEST CONDITIONS
Symbol
V
LOAD
V
IH
V
T
V
LZ
V
HZ
C
L
V
CC(1)
= 3.3V±0.3V V
CC(1)
= 2.7V
6
2.7
1.5
300
300
50
V
CC
500
Ω
Pulse
Generator
(1, 2)
SAME PHASE
INPU T TRAN SITION
V
CC(2)
= 2.5V±0.2V
2 x Vcc
Vcc
Vcc / 2
150
150
30
Unit
V
V
V
mV
mV
pF
V
LOAD
Open
GND
t
PLH
OU TPUT
t
PLH
OPPOSITE PHASE
INPU T TRAN SITION
t
PHL
6
2.7
1.5
300
300
50
t
PHL
Propagation Delay
ENABLE
CON TROL
IN PUT
t
PZL
DISABLE
V
IN
D .U .T.
V
OUT
V
IH
V
T
0V
V
LOAD/2
V
OL
+ V
LZ
V
OL
V
OH
V
OH -
V
HZ
0V
ALV C Link
t
PLZ
V
LOAD/2
V
T
t
PHZ
V
T
0V
R
T
500
Ω
C
L
ALVC Link
Test Circuit for All Outputs
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse Generator.
NOTES:
1. Pulse Generator for All Pulses: Rate
≤
1.0MHz; t
F
≤
2.5ns; t
R
≤
2.5ns.
2. Pulse Generator for All Pulses: Rate
≤
1.0MHz; t
F
≤
2ns; t
R
≤
2ns.
OUTPU T
SW ITCH
NOR MALLY
CLO SED
LOW
t
PZ H
OU TPUT
SW ITCH
NORMALLY
O PE N
H IGH
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
V
IH
V
T
0V
V
IH
V
T
0V
V
IH
V
T
0V
V
IH
V
T
0V
ALVC Link
Enable and Disable Times
SWITCH POSITION
Test
Open Drain
Disable Low
Enable Low
Disable High
Enable High
All Other Tests
Switch
V
LOAD
GND
Open
V
IH
INPU T
V
T
0V
V
OH
OUTPUT 1
V
T
V
OL
V
OH
OUTPUT 2
t
PLH2
t
PHL2
ALVC Link
DATA
INPUT
TIMING
INPU T
ASYNC HRON OU S
CON TROL
SYNC HRON OU S
CON TROL
t
SU
t
H
t
R EM
t
SU
t
H
Set-up, Hold, and Release Times
t
PLH1
t
PHL1
LOW -H IGH -LOW
PULSE
t
W
HIGH-LOW -HIGH
PULSE
V
T
t
SK
(x)
t
SK
(x)
V
T
ALVC Link
V
T
V
OL
Pulse Width
t
SK
(x)
= t
PLH2
-
t
PLH1
or
t
PH L2
-
t
PHL1
Output Skew - t
SK
(
X
)
NOTES:
1. For t
SK
(o) OUTPUT1 and OUTPUT2 are any two outputs.
2. For t
SK
(b) OUTPUT1 and OUTPUT2 are in the same bank.
5
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