PDU54
4-BIT, ECL-INTERFACED
PROGRAMMABLE DELAY LINE
(SERIES PDU54)
FEATURES
•
•
•
•
•
Digitally programmable in 16 delay steps
Monotonic delay-versus-address variation
Precise and stable delays
Input & outputs fully 100K-ECL interfaced & buffered
Available in 24-pin DIP (600 mil) socket or SMD
PDU54-xx DIP
PDU54-xxM Military DIP
N/C
N/C
GND
N/C
N/C
N/C
N/C
N/C
GND
OUT
N/C
N/C
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
data
3
delay
devices,
inc.
PACKAGES
IN
N/C
VEE
A3
N/C
N/C
A2
A1
VEE
A0
N/C
N/C
N/C
N/C
GND
N/C
N/C
N/C
N/C
N/C
GND
OUT
N/C
N/C
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
IN
N/C
VEE
A3
N/C
N/C
A2
A1
VEE
A0
N/C
N/C
PDU54-xxC4 SMD
PDU54-xxMC4 Mil SMD
FUNCTIONAL DESCRIPTION
The PDU54-series device is a 4-bit digitally programmable delay line. The
delay, TD
A
, from the input pin (IN) to the output pin (OUT) depends on the
address code (A3-A0) according to the following formula:
TD
A
= TD
0
+ T
INC
* A
PIN DESCRIPTIONS
IN
OUT
A3-A0
VEE
GND
Signal Input
Signal Output
Address Bits
-5 Volts
Ground
where A is the address code, T
INC
is the incremental delay of the device, and TD
0
is the inherent delay of
the device. The incremental delay is specified by the dash number of the device and can range from
100ps through 3000ps, inclusively. The address is not latched and must remain asserted during normal
operation.
SERIES SPECIFICATIONS
•
•
•
•
•
•
•
•
•
Total programmed delay tolerance:
5% or 40ps,
whichever is greater
Inherent delay (TD
0
):
3.3ns typical
Address to input setup (T
AIS
):
2.9ns
Operating temperature:
0° to 85° C
Temperature coefficient:
100PPM/°C (excludes TD
0
)
Supply voltage V
EE
:
-5VDC
±
0.7V
Power Supply Current:
-300ma typical (50Ω to -2V)
Minimum pulse width:
3ns or 10% of total delay,
whichever is greater
Minimum period:
8ns or 2 x pulse width, whichever
is greater
A
i-1
PW
IN
IN
TD
A
OUT
Figure 1: Timing Diagram
1997
Data Delay Devices
DASH NUMBER SPECIFICATIONS
Part
Number
PDU54-100
PDU54-200
PDU54-250
PDU54-400
PDU54-500
PDU54-750
PDU54-1000
PDU54-1200
PDU54-1500
PDU54-2000
PDU54-2500
PDU54-3000
Incremental Delay
Per Step (ps)
100
±
50
200
±
60
250
±
60
400
±
80
500
±
100
750
±
100
1000
±
200
1200
±
200
1500
±
200
2000
±
400
2500
±
400
3000
±
500
Total Delay
Change (ns)
1.50
3.00
3.75
6.00
7.50
11.25
15.00
18.00
22.50
30.00
37.50
45.00
A3-A0
A
i
T
OAX
T
AIS
NOTE: Any dash number between 100 and 3000
not shown is also available.
PW
OUT
Doc #98004
3/18/98
DATA DELAY DEVICES, INC.
3 Mt. Prospect Ave. Clifton, NJ 07013
1
PDU54
APPLICATION NOTES
ADDRESS UPDATE
The PDU54 is a memory device. As such,
special precautions must be taken when
changing the delay address in order to prevent
spurious output signals. The timing restrictions
are shown in Figure 1.
After the last signal edge to be delayed has
appeared on the OUT pin, a minimum time, T
OAX
,
is required before the address lines can change.
This time is given by the following relation:
T
OAX
= max { (A
i
- A
i-1
) * T
INC
, 0 }
where A
i-1
and A
i
are the old and new address
codes, respectively. Violation of this constraint
may, depending on the history of the input signal,
cause spurious signals to appear on the OUT
pin. The possibility of spurious signals persists
until the required T
OAX
has elapsed.
conditions are those for which the delay
tolerance specifications and monotonicity are
guaranteed. The
suggested
conditions are
those for which signals will propagate through the
unit without significant distortion. The
absolute
conditions are those for which the unit will
produce some type of output for a given input.
When operating the unit between the
recommended and absolute conditions, the
delays may deviate from their values at low
frequency. However, these deviations will
remain constant from pulse to pulse if the input
pulse width and period remain fixed. In other
words, the delay of the unit exhibits frequency
and pulse width dependence when operated
beyond the recommended conditions. Please
consult the technical staff at Data Delay Devices
if your application has specific high-frequency
requirements.
Please note that the increment tolerances listed
represent a design goal. Although most delay
increments will fall within tolerance, they are not
guaranteed throughout the address range of the
unit. Monotonicity is, however, guaranteed over
all addresses.
INPUT RESTRICTIONS
There are three types of restrictions on input
pulse width and period listed in the
AC
Characteristics
table. The
recommended
PACKAGE DIMENSIONS
24 23 22 21 20 19 18 17 16 15 14 13
.580
MAX.
.010
±
.002
1
2
3
4
5
6
7
8
9 10 11 12
.600
±
.005
1.270
±
.010
Lead Material:
Nickel-Iron alloy 42
TIN PLATE
.380
MAX.
.015 TYP.
.018 TYP.
.070 MAX.
1.100
±
.010
11 Equal spaces
each .100
±
.010
Non-Accumulative
PDU54-xx (Commercial DIP)
PDU54-xxM (Military DIP)
Doc #98004
3/18/98
DATA DELAY DEVICES, INC.
Tel: 973-773-2299
Fax: 973-773-9672
http://www.datadelay.com
2
PDU54
PACKAGE DIMENSIONS (cont’d)
.020 TYP.
.040 TYP.
.010±.002
24 23 22 21 20 19 18 17 16 15 14 13
.710 .590
±.00
MAX.
.882
±.00
.007
±.00
1
2
3
4
5
6
7
8
9
10 11 12
.090
1.100
1.280±.020
.100
.380
MAX.
.050
±.01
PDU54-xxC4 (Commercial SMD)
PDU54-xxMC4 (Military SMD)
DEVICE SPECIFICATIONS
TABLE 1: AC CHARACTERISTICS
PARAMETER
Total Programmable Delay
Inherent Delay
Address to Input Setup Time
Output to Address Change
Absolute
Input Period
Suggested
Recommended
Absolute
Input Pulse Width
Suggested
Recommended
SYMBOL
TD
T
TD
0
T
AIS
T
OAX
PER
IN
PER
IN
PER
IN
PW
IN
PW
IN
PW
IN
MIN
TYP
7
3.3
UNITS
T
INC
ns
ns
% of TD
T
% of TD
T
% of TD
T
% of TD
T
% of TD
T
% of TD
T
2.9
See Text
20
40
200
10
20
100
TABLE 2: ABSOLUTE MAXIMUM RATINGS
PARAMETER
DC Supply Voltage
Input Pin Voltage
Storage Temperature
Lead Temperature
SYMBOL
V
EE
V
IN
T
STRG
T
LEAD
MIN
-7.0
V
EE
- 0.3
-65
MAX
0.3
0.3
150
300
UNITS
V
V
C
C
NOTES
10 sec
TABLE 3: DC ELECTRICAL CHARACTERISTICS
(0C to 85C)
PARAMETER
High Level Output Voltage
Low Level Output Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Input Current
Low Level Input Current
SYMBOL
V
OH
V
OL
V
IH
V
IL
I
IH
I
IL
MIN
-1.025
-1.810
-1.165
-1.810
0.5
MAX
-0.880
-1.620
-0.880
-1.475
340
UNITS
V
V
V
V
µA
µA
NOTES
V
IH
= MAX,50Ω to -2V
V
IL
= MIN, 50Ω to -2V
V
IH
= MAX
V
IL
= MIN
Doc #98004
3/18/98
DATA DELAY DEVICES, INC.
3 Mt. Prospect Ave. Clifton, NJ 07013
3
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