3D7438 Datasheet, PDF (4/6 Pages) Data Delay Devices, Inc. – MONOLITHIC 8-BIT PROGRAMMABLE DELAY LINE (SERIES 3D7438)

3D7438
APPLICATION NOTES (CONT’D)
ENABLE
(AE)
PARALLEL
INPUTS
P0-P7
DELAY
TIME
t_EW
t_DSE
t_DHE
t_EDX
NEW VALUE
t_EDV
PREVIOUS
NEW VALUE
Figure 3: Latched parallel mode (MD=1)
ENABLE
(AE)
CLOCK
(SC)
SERIAL
INPUT
(SI)
SERIAL
OUTPUT
(SO)
DELAY
TIME
t_EW
t_ES
t_CW t_CW
t_EH
t_DSC
NEW
BIT 7
t_EGV
OLD
BIT 7
t_DHC
NEW
BIT 6
t_CQV
OLD
BIT 6
PREVIOUS VALUE
t_CQX
NEW
BIT 0
OLD
BIT 0
t_EDX
Figure 4: Serial mode (MD=0)
t_EQZ
t_EDV
NEW
VALUE
FROM
WRITING
DEVICE
3D7438
SI
SO
SC AE
3D7438
SI
SO
SC AE
3D7438
SI
SO
SC AE
TO
NEXT
DEVICE
Figure 5: Cascading Multiple Devices
TABLE 2: DELAY VS. PROGRAMMED ADDRESS
PROGRAMMED ADDRESS
PARALLEL P7 P6 P5 P4 P3 P2 P1 P0
SERIAL
Msb
Lsb
STEP 0
0 0000000
STEP 1
0 0000001
STEP 2
0 0000010
STEP 3
0 0000011
STEP 4
0 0000100
STEP 5
0 0000101
-50
7.000
7.050
7.100
7.150
7.200
7.250
NOMINAL DELAY (NS)
PER 3D7438 DASH NUMBER
-75 -100 -125 -150 -200
7.000
7.075
7.150
7.225
7.000
7.100
7.200
7.300
7.000
7.125
7.250
7.375
7.000
7.150
7.300
7.450
7.000
7.200
7.400
7.600
7.300 7.400 7.500 7.600
7.375 7.500 7.625 7.750
7.800
8.000
-250
7.000
7.250
7.500
7.750
8.000
8.250
STEP 253
STEP 254
STEP 255
CHANGE
1 1 1 1 1 1 0 1 19.650 25.975 32.300 38.625 44.950 57.600 70.250
1 1 1 1 1 1 1 0 19.700 26.050 32.400 38.750 45.100 57.800 70.500
1 1 1 1 1 1 1 1 19.750 26.125 32.500 38.875 45.250 58.000 70.750
12.750 19.125 25.500 31.875 38.250 51.000 63.750
Doc #10004
DATA DELAY DEVICES, INC.
4
7/8/2010
Tel: [phone] Fax: [phone] http://www.datadelay.com