PDU54
4-BIT, ECL-INTERFACED
PROGRAMMABLE DELAY LINE
(SERIES PDU54)
FEATURES PACKAGES
· 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
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
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.
data
delay
devices,
inc.
3
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
N/C
N/C
GND
N/C
N/C
N/C
N/C
N/C
GND
OUT
N/C
N/C
IN
N/C
VEE
A3
N/C
N/C
A2
A1
VEE
A0
N/C
N/C
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
N/C
N/C
GND
N/C
N/C
N/C
N/C
N/C
GND
OUT
N/C
N/C
IN
N/C
VEE
A3
N/C
N/C
A2
A1
VEE
A0
N/C
N/C
PDU54-xx
DIP
PDU54-xxM Military DIP
PDU54-xxC4
SMD
PDU54-xxMC4 Mil SMD
PIN DESCRIPTIONS
IN Signal
Input
OUT Signal
Output
A3-A0 Address Bits
VEE -5
Volts
GND Ground
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 (50 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
DASH NUMBER SPECIFICATIONS
Part
Number
Incremental Delay
Per Step (ps)
Total Delay
Change (ns)
PDU54-100
100
± 50
1.50
PDU54-200
200
± 60
3.00
PDU54-250
250
± 60
3.75
PDU54-400
400
± 80
6.00
PDU54-500
500
± 100
7.50
PDU54-750
750
± 100
11.25
PDU54-1000
1000
± 200
15.00
PDU54-1200
1200
± 200
18.00
PDU54-1500
1500
± 200
22.50
PDU54-2000
2000
± 400
30.00
PDU54-2500
2500
± 400
37.50
PDU54-3000
3000
± 500
45.00
NOTE: Any dash number between 100 and 3000
not shown is also available.
T
OAX
PW
IN
TD
A
PW
OUT
A3-A0
IN
OUT
Figure 1: Timing Diagram
A
i-1
A
i
T
AIS
1997 Data Delay Devices
Doc #98004
DATA DELAY DEVICES, INC.
1
3/18/98
3 Mt. Prospect Ave. Clifton, NJ 07013
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.
INPUT RESTRICTIONS
There are three types of restrictions on input
pulse width and period listed in the AC
Characteristics table. The recommended
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.
PACKAGE DIMENSIONS
PDU54-xx (Commercial DIP)
PDU54-xxM (Military DIP)
1.270
±.010
1
2
3
4
5
6
7
8
16 15 14 13
12
11
10
9
.380
MAX.
.015 TYP.
.070 MAX.
.018 TYP.
1.100
±.010
11 Equal spaces
each .100
±.010
Non-Accumulative
.580
MAX.
.600
±.005
.010
±.002
Lead Material:
Nickel-Iron alloy 42
TIN PLATE
20 19 18 17
24 23 22 21
Doc #98004
DATA DELAY DEVICES, INC.
2
3/18/98
Tel: 973-773-2299 Fax: 973-773-9672 http://www.datadelay.com
PDU54
Doc #98004
DATA DELAY DEVICES, INC.
3
3/18/98
3 Mt. Prospect Ave. Clifton, NJ 07013
PACKAGE DIMENSIONS (cont'd)
PDU54-xxC4 (Commercial SMD)
PDU54-xxMC4 (Military SMD)
1.280
±.020
.882
±.00
.020 TYP.
.040 TYP.
.100
.090
1.100
.380
MAX.
.590
MAX.
.010
±.002
.050
±.01
.710
±.00
.007
±.00
1
2
3
4
5
6
7
8
9
10 11 12
13
14
15
16
17
18
19
20
21
22
23
24
DEVICE SPECIFICATIONS
TABLE 1: AC CHARACTERISTICS
PARAMETER SYMBOL
MIN
TYP
UNITS
Total Programmable Delay
TD
T
7
T
INC
Inherent Delay
TD
0
3.3
ns
Address to Input Setup Time
T
AIS
2.9 ns
Output to Address Change
T
OAX
See
Text
Absolute
PER
IN
20
% of TD
T
Input Period
Suggested
PER
IN
40
% of TD
T
Recommended
PER
IN
200
% of TD
T
Absolute
PW
IN
10
% of TD
T
Input Pulse Width
Suggested
PW
IN
20
% of TD
T
Recommended
PW
IN
100
% of TD
T
TABLE 2: ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL
MIN MAX
UNITS
NOTES
DC Supply Voltage
V
EE
-7.0 0.3 V
Input Pin Voltage
V
IN
V
EE
- 0.3
0.3
V
Storage Temperature
T
STRG
-65 150 C
Lead Temperature
T
LEAD
300
C
10
sec
TABLE 3: DC ELECTRICAL CHARACTERISTICS
(0C to 85C)
PARAMETER SYMBOL
MIN
MAX
UNITS NOTES
High Level Output Voltage
V
OH
-1.025
-0.880 V V
IH
= MAX,50
to -2V
Low Level Output Voltage
V
OL
-1.810
-1.620 V V
IL
= MIN, 50
to -2V
High Level Input Voltage
V
IH
-1.165
-0.880 V
Low Level Input Voltage
V
IL
-1.810
-1.475 V
High Level Input Current
I
IH
340
µA
V
IH
= MAX
Low Level Input Current
I
IL
0.5
µA
V
IL
= MIN
PDU54
DELAY LINE AUTOMATED TESTING
TEST CONDITIONS
INPUT:
OUTPUT:
Ambient Temperature: 25
o
C
± 3
o
C
Load: 50
to -2V
Supply Voltage (Vcc): -4.5V
± 0.1V
C
load
: 5pf
± 10%
Input Pulse:
Standard 100K ECL
Threshold: (V
OH
+ V
OL
) / 2
levels
(Rising & Falling)
Source Impedance: 50
Max.
Rise/Fall Time:
1.0 ns Max. (measured
between 20% and 80%)
Pulse Width: PW
IN
= 10ns
Period: PER
IN
= 100ns
NOTE: The above conditions are for test only and do not in any way restrict the operation of the device.
OUT
OUT
TRIG
IN
REF
TRIG
Test Setup
DEVICE UNDER
TEST (DUT)
OSCILLOSCOPE
PULSE
GENERATOR
IN
ADDRESS SELECT
Timing Diagram For Testing
T
RISE
T
FALL
PER
IN
PW
IN
T
RISE
T
FALL
20%
20%
50%
50%
80%
80%
50%
50%
V
IH
V
IL
V
OH
V
OL
INPUT
SIGNAL
OUTPUT
SIGNAL
Doc #98004
DATA DELAY DEVICES, INC.
4
3/18/98
Tel: 973-773-2299 Fax: 973-773-9672 http://www.datadelay.com
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