DS1044
DS1044
4–in–1 High–Speed Silicon Delay Line
FEATURES
PIN ASSIGNMENT
IN1
NC
IN2
IN3
IN4
NC
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
CC
NC
OUT1
NC
OUT2
OUT3
OUT4
•
All–silicon timing circuit
•
Four independent buffered delays
•
Initial delay tolerance
±1.5
ns
•
Stable and precise over temperature and voltage
•
Leading
and trailing edge precision preserves the
input symmetry
•
Standard 14–pin DIP, 14–pin SOIC (150 mil)
•
Vapor phase, IR and wave solderable
•
Available in Tape and Reel
DS1044 14–PIN DIP
DS1044R 14–PIN SOIC (150 MIL)
See Mech. Drawings
Section
PIN DESCRIPTION
IN1–IN4
OUT1–OUT4
NC
V
CC
GND
–
–
–
–
–
Input Signals
Output Signals
No Connection
+5 Volt Supply
Ground
DESCRIPTION
The DS1044 series is a 4–in–1 version of the low–
power, +5 Volt, high speed, DS1035.
The DS1044 series of delay lines have four independent
logic buffered delays in a single package. The device is
Dallas Semiconductor’s fastest 4–in–1 delay line. It is
available in a standard 14–pin DIP and 14–pin SOIC.
The device features precise leading and trailing edge
accuracies. It has the inherent reliability of an all–silicon
delay line solution. The DS1044’s nominal tolerance is
±1.5
ns and an additional tolerance over temperature
and voltage of
±1.0
ns for the faster delays. Each output
is capable of driving up to 10 LS loads.
Standard delay values are indicated in Table 1. Cus-
tomers may contact Dallas Semiconductor at (972)
371–4348 for further information.
021798 1/6
DS1044
LOGIC DIAGRAM
Figure 1
IN
OUT
TIME DELAY
ONE OF FOUR
PART NUMBER DELAY TABLE (t
PLH
, t
PHL
)
Table 1
PART NUMBER
DS1044–5
DS1044–6
DS1044–7
DS1044–8
DS1044–10
DS1044–12
DS1044–14
DS1044–18
DS1044–20
DS1044–25
DELAY PER OUTPUT
(ns)
5
6
7
8
10
12
14
18
20
25
INITIAL TOLERANCE
±1.5
ns
±1.5
ns
±1.5
ns
±1.5
ns
±1.5
ns
±1.5
ns
±1.5
ns
±1.5
ns
±1.5
ns
±2.0
ns
TOLERANCE OVER
(temp and voltage)
±1.0
ns
±1.0
ns
±1.0
ns
±1.0
ns
±1.0
ns
±1.0
ns
±1.5
ns
±1.5
ns
±1.5
ns
±1.5
ns
NOTES:
1. Nominal conditions are +25°C and V
CC
=+5.0 volts.
2. Temperature range of 0°C to 70°C and voltage range of 4.75 volts to 5.25 volts.
3. Delay accuracy are for both leading and trailing edges.
021798 2/6
DS1044
TEST SETUP DESCRIPTION
Figure 2 illustrates the hardware configuration used for
measuring the timing parameters of the DS1044. The
input waveform is produced by a precision pulse gener-
ator under software control. Time delays are measured
by a time interval counter (20 ps resolution) connected
to the output. The DS1044 output taps are selected and
connected to the interval counter by a VHF switch con-
trol unit. All measurements are fully automated with
each instrument controlled by the computer over an
IEEE 488 bus.
DS1044 TEST CIRCUIT
Figure 2
PULSE
GENERATOR
START
TIME INTERVAL
COUNTER
50Ω
4
INPUTS
STOP
UNIT UNDER
TEST
VHF
SWITCH
CONTROL
UNIT
OUT
50Ω
OUTPUTS 1–4
021798 3/6
DS1044
ABSOLUTE MAXIMUM RATINGS*
Voltage on Any Pin Relative to Ground
Operating Temperature
Storage Temperature
Soldering Temperature
Short Circuit Output Current
–1.0V to +7.0V
0°C to 70°C
–55°C to +125°C
260°C for 10 seconds
50 mA for 1 second
* This is a stress rating only and functional operation of the device at these or any other conditions above those
indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods of time may affect reliability.
DC ELECTRICAL CHARACTERISTICS
PARAMETER
Supply Voltage
Active Current
High Level Input Voltage
Low Level Input Voltage
Input Leakage
High Level Output Current
Low Level Output Current
SYMBOL
V
CC
I
CC
V
IH
V
IL
I
L
I
OH
I
OL
0V<V
I
<V
CC
V
CC
=4.75V
V
OH
=4V
V
CC
=4.75V
V
OL
=0.5V
12
V
CC
=5.25V
Period=1µs
2.2
–0.5
–1.0
TEST
CONDITION
MIN
4.75
(0°C to 70°C; V
CC
=+5V
±
5%)
TYP
5.00
MAX
5.25
45
V
CC
+0.5
0.8
1.0
–1.0
UNITS
V
mA
V
V
µA
mA
mA
AC ELECTRICAL CHARACTERISTICS
PARAMETER
Period
Input Pulse Width
Input–to–Tap Output Delay
Output Rise or Fall Time
Power–up Time
SYMBOL
t
PERIOD
t
WI
t
PLH,
t
PHL
t
OR
, t
OF
t
PU
MIN
2 (t
WI
)
100% of
Tap Delay
Table 1
2.0
2.5
100
TYP
MAX
(+25°C; V
CC
=5V
±
5%)
UNITS
ns
ns
ns
ns
ms
NOTES
3
3
CAPACITANCE
PARAMETER
Input Capacitance
SYMBOL
C
IN
MIN
TYP
MAX
10
UNITS
pF
(t
A
=25°C)
NOTES
021798 4/6
DS1044
TEST CONDITIONS
Ambient Temperature: 25°C
±
3°C
Supply Voltage (V
CC
): 5.0V
±
0.1V
Input Pulse:
High: 3.0V
±
0.1V
Low: 0.0V
±
0.1V
Source Impedance: 50Ω Max.
Rise and Fall Time: 3.0 ns Max. – Measured between 0.6V and 2.4V.
Pulse Width: 500 ns
Pulse Period: 1
µs
Output Load Capacitance: 15 pF
Output: Each output is loaded with the equivalent of one 74F04 input gate.
Data is measured at the 1.5V level on the rising and falling edges.
Note: The above conditions are for test only and do not restrict the devices under other data sheet conditions.
TIMING DIAGRAM
PERIOD
t
RISE
t
FALL
80%
1.5V
20%
IN
t
WI
t
PHL
t
PLH
t
WI
1.5V
1.5V
1.5V
OUT
1.5V
NOTES:
1. All voltages are referenced to ground.
2. @ V
CC
=5 volts and 25°C, delay accuracy on both the rising and falling edges within tolerances given in
Table 1.
3. Pulse width and duty cycle specifications may be exceeded, however, accuracy will be application sensitive
with respect to de–coupling, layout, etc.
021798 5/6
Embedded System
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