3D7408
APPLICATION NOTES (CONT’D)
t
EW
ENABLE
(AE)
t
ES
CLOCK
(SC)
t
CW
t
CW
t
EH
t
DSC
SERIAL
INPUT
(SI)
SERIAL
OUTPUT
(SO)
DELAY
TIME
NEW
BIT 7
t
DHC
NEW
BIT 6
NEW
BIT 0
t
EGV
OLD
BIT 7
t
CQV
OLD
BIT 6
t
CQX
OLD
BIT 0
t
EQZ
t
EDV
NEW
VALUE
t
EDX
PREVIOUS VALUE
Figure 4: Serial mode (MD=0)
3D7408
SI
SO
AE
3D7408
SI
SC
AE
SO
3D7408
SI
SC
AE
SO
FROM
WRITING
DEVICE
SC
TO
NEXT
DEVICE
Figure 5: Cascading Multiple Devices
TABLE 2: DELAY VS. PROGRAMMED ADDRESS
PARALLEL
SERIAL
STEP 0
STEP 1
STEP 2
STEP 3
STEP 4
STEP 5
STEP 253
STEP 254
STEP 255
DELAY CHANGE
PROGRAMMED ADDRESS
P7
P6
P5
P4
Msb
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
P3
0
0
0
0
0
0
1
1
1
P2
0
0
0
0
1
1
1
1
1
P1
0
0
1
1
0
0
0
1
1
P0
Lsb
0
1
0
1
0
1
1
0
1
NOMINAL DELAY (NS)
3D7408 DASH NUMBER
-.25
-.5
-1
-2
12.00
12.0
12
12
12.25
12.5
13
14
12.50
13.0
14
16
12.75
13.5
15
18
13.00
14.0
16
20
13.25
14.5
17
22
75.25
75.50
75.75
63.75
138.5
139.0
139.5
127.5
265
266
267
255
518
520
522
510
-5
17
22
27
32
37
42
1283
1287
1292
1275
Doc #96003
12/2/96
DATA DELAY DEVICES, INC.
3 Mt. Prospect Ave. Clifton, NJ 07013
5
DATADELAY [ DATA DELAY DEVICES, INC. ]
